/*================================================================== Application: Utility Function Author: John Gardner Website: http://www.braemoor.co.uk/software/vat.shtml Version: V1.0 Date: 30th July 2005 Description: Used to check the validity of an EU country VAT number Version: V1.1 Date: 3rd August 2005 Description: Lithuanian legal entities & Maltese check digit checks added. Version: V1.2 Date: 20th October 2005 Description: Italian checks refined (thanks Matteo Mike Peluso). Version: V1.3 Date: 16th November 2005 Description: Error in GB numbers ending in 00 fixed (thanks Guy Dawson). Version: V1.4 Date: 28th September 2006 Description: EU-type numbers added. Version: V1.5 Date: 1st January 2007 Description: Romanian and Bulgarian numbers added. Version: V1.6 Date: 7th January 2007 Description: Error with Slovenian numbers (thanks to Ales Hotko). Version: V1.7 Date: 10th February 2007 Description: Romanian check digits added. Thanks to Dragu Costel for the test suite. Version: V1.8 Date: 3rd August 2007 Description: IE code modified to allow + and * in old format numbers. Thanks to Antonin Moy of Sphere Solutions for pointing out the error. Version: V1.9 Date: 6th August 2007 Description: BE code modified to make a specific check that the leading character of 10 digit numbers is 0 (belts and braces). Version: V1.10 Date: 10th August 2007 Description: Cypriot check digit support added. Check digit validation support for non-standard UK numbers Version: V1.11 Date: 25th September 2007 Description: Spain check digit support for personal numbers. Author: David Perez Carmona Version: V1.12 Date: 23rd November 2009 Description: GB code modified to take into account new style check digits. Thanks to Guy Dawson of Crossflight Ltd for pointing out the necessity. Version: V1.13 Date: 7th July 2012 Description: EL, GB, SE and BE formats updated - thanks to Joost Van Biervliet of VAT Applications Version: V.14 Date: 8th April 2013 Description: BE Pattern match refined BG Add check digit checks for all four types of VAT number CY Pattern match improved CZ Personal pattern match checking improved CZ Personal check digits incorporated EE improved pattern match ES Physical person number checking refined GB Check digit support provided for 12 digit VAT codes and range checks included IT Bug removed to allow 999 and 888 issuing office codes LT temporarily registered taxpayers check digit support added LV Natural persons checks added RO improved pattern match SK improved pattern match and added check digit support Thanks to Theo Vroom for his help in this latest release. Version: V1.15 Date: 15th April 2013 Swedish algorithm re-implemented. Version: V1.16 Date: 25th July 2013 Support for Croatian numbers added Version V1.17 10th September 2013 Support for Norwegian MVA numbers added (yes, I know that Norway is not in the EU!) Version V1.18 29th October 2013 Partial support for new style Irish numbers. See http://www.revenue.ie/en/practitioner/ebrief/2013/no-032013.html Thanks to Simon Leigh for drawing the author's attention to this. Version V1.19 31st October 2013 Support for Serbian PBI numbers added (yes, I know that Serbia is not in the EU!) Version V1.20 1st November 2013 Support for Swiss MWST numbers added (yes, I know that Switzerland is not in the EU!) Version V1.21 16th December 2014 Non-critical code tidies to French and Danish regular expressions. Thanks to Bill Seddon of Lyquidity Solutions Version V1.22 14th January 2014 Non-critical code tidy to regular expression for new format Irish numbers. Thanks to Olivier Reubens of UNIT4 C-Logic N.V. Version V1.23 10th April 2014 Support for Russian INN numbers added (yes, I know that Russia is not in the EU!). Thanks to Marco Cesaratto of Arki Tech, Italy Version V1.24 4th June 2014 Check digit validation supported for Irish Type 3 numbers Thanks to Olivier Reubens of UNIT4 C-Logic N.V. Version V1.25 29th July 2014 Code improvements Thanks to Sébastien Boelpaep and Nate Kerkhofs Version V1.26 4th May 2015 Code improvements to regular expressions Thanks to Robert Gust-Bardon of webcraft.ch Version V1.27 3rd December 2015 Extend Swiss optional suffix to allow TVA and ITA Thanks to Oskars Petermanis Version V1.28 30th August 2016 Correct Swiss optional suffix to allow TVA and IVA Thanks to Jan Verhaegen Version V1.29 29th July 2017 Correct Czeck Republic checking of Individual type 2 - Special Cases Thanks to Andreas Wuermser of Auer Packaging UK Parameters: toCheck - VAT number be checked. This function checks the value of the parameter for a valid European VAT number. If the number is found to be invalid format, the function returns a value of false. Otherwise it returns the VAT number re-formatted. Example call: if (checkVATNumber (myVATNumber)) alert ("VAT number has a valid format") else alert ("VAT number has invalid format"); ---------------------------------------------------------------------------------------------------*/ var checkVATNumber = (function (){ // Array holds the regular expressions for the valid VAT number var vatexp = new Array(); // Note - VAT codes without the "**" in the comment do not have check digit checking. vatexp.push(/^(AT)U(\d{8})$/); //** Austria vatexp.push(/^(BE)(\d{9,10})$/); //** Belgium vatexp.push(/^(BG)(\d{9,10})$/); //** Bulgaria vatexp.push(/^(CHE)(\d{9})(MWST|TVA|IVA)?$/); //** Switzerland vatexp.push(/^(CY)([0-59]\d{7}[A-Z])$/); //** Cyprus vatexp.push(/^(CZ)(\d{8,10})(\d{3})?$/); //** Czech Republic vatexp.push(/^(DE)([1-9]\d{8})$/); //** Germany vatexp.push(/^(DK)(\d{8})$/); //** Denmark vatexp.push(/^(EE)(10\d{7})$/); //** Estonia vatexp.push(/^(EL)(\d{9})$/); //** Greece vatexp.push(/^(ES)([A-Z]\d{8})$/); //** Spain (National juridical entities) vatexp.push(/^(ES)([A-HN-SW]\d{7}[A-J])$/); //** Spain (Other juridical entities) vatexp.push(/^(ES)([0-9YZ]\d{7}[A-Z])$/); //** Spain (Personal entities type 1) vatexp.push(/^(ES)([KLMX]\d{7}[A-Z])$/); //** Spain (Personal entities type 2) vatexp.push(/^(EU)(\d{9})$/); //** EU-type vatexp.push(/^(FI)(\d{8})$/); //** Finland vatexp.push(/^(FR)(\d{11})$/); //** France (1) vatexp.push(/^(FR)([A-HJ-NP-Z]\d{10})$/); // France (2) vatexp.push(/^(FR)(\d[A-HJ-NP-Z]\d{9})$/); // France (3) vatexp.push(/^(FR)([A-HJ-NP-Z]{2}\d{9})$/); // France (4) vatexp.push(/^(GB|XI)(\d{9})$/); //** UK & Northern Ireland (Standard) vatexp.push(/^(GB|XI)(\d{12})$/); //** UK & Northern Ireland (Branches) vatexp.push(/^(GB)(GD\d{3})$/); //** UK (Government) vatexp.push(/^(GB)(HA\d{3})$/); //** UK (Health authority) vatexp.push(/^(HR)(\d{11})$/); //** Croatia vatexp.push(/^(HU)(\d{8})$/); //** Hungary vatexp.push(/^(IE)(\d{7}[A-W])$/); //** Ireland (1) vatexp.push(/^(IE)([7-9][A-Z\*\+)]\d{5}[A-W])$/); //** Ireland (2) vatexp.push(/^(IE)(\d{7}[A-W][AH])$/); //** Ireland (3) vatexp.push(/^(IT)(\d{11})$/); //** Italy vatexp.push(/^(LV)(\d{11})$/); //** Latvia vatexp.push(/^(LT)(\d{9}|\d{12})$/); //** Lithunia vatexp.push(/^(LU)(\d{8})$/); //** Luxembourg vatexp.push(/^(MT)([1-9]\d{7})$/); //** Malta vatexp.push(/^(NL)(\d{9})B\d{2}$/); //** Netherlands vatexp.push(/^(NO)(\d{9})$/); //** Norway (not EU) vatexp.push(/^(PL)(\d{10})$/); //** Poland vatexp.push(/^(PT)(\d{9})$/); //** Portugal vatexp.push(/^(RO)([1-9]\d{1,9})$/); //** Romania vatexp.push(/^(RU)(\d{10}|\d{12})$/); //** Russia vatexp.push(/^(RS)(\d{9})$/); //** Serbia vatexp.push(/^(SI)([1-9]\d{7})$/); //** Slovenia vatexp.push(/^(SK)([1-9]\d[2346-9]\d{7})$/); //** Slovakia Republic vatexp.push(/^(SE)(\d{10}01)$/); //** Sweden function checkVATNumber(toCheck) { // Load up the string to check var VATNumber = toCheck.toUpperCase(); // Remove spaces etc. from the VAT number to help validation VATNumber = VATNumber.replace(/(\s|-|\.)+/g, ''); // Assume we're not going to find a valid VAT number var valid = false; // Check the string against the regular expressions for all types of VAT numbers for (var i = 0; i < vatexp.length; i++) { // Have we recognised the VAT number? if (vatexp[i].test(VATNumber)) { // Yes - we have var cCode = RegExp.$1; // Isolate country code var cNumber = RegExp.$2; // Isolate the number // Call the appropriate country VAT validation routine depending on the country code if (eval(cCode + "VATCheckDigit ('" + cNumber + "')")) valid = VATNumber; // Having processed the number, we break from the loop break; } } // Return with either an error or the reformatted VAT number return valid; } function ATVATCheckDigit(vatnumber) { // Checks the check digits of an Austrian VAT number. var total = 0; var multipliers = [1, 2, 1, 2, 1, 2, 1]; var temp = 0; // Extract the next digit and multiply by the appropriate multiplier. for (var i = 0; i < 7; i++) { temp = Number(vatnumber.charAt(i)) * multipliers[i]; if (temp > 9) total += Math.floor(temp / 10) + temp % 10; else total += temp; } // Establish check digit. total = 10 - (total + 4) % 10; if (total == 10) total = 0; // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(7, 8)) return true; else return false; } function BEVATCheckDigit(vatnumber) { // Checks the check digits of a Belgium VAT number. // Nine digit numbers have a 0 inserted at the front. if (vatnumber.length == 9) vatnumber = "0" + vatnumber; // Modulus 97 check on last nine digits if (97 - vatnumber.slice(0, 8) % 97 == vatnumber.slice(8, 10)) return true; else return false; } function BGVATCheckDigit(vatnumber) { var temp, total, multipliers, i; // Checks the check digits of a Bulgarian VAT number. if (vatnumber.length == 9) { // Check the check digit of 9 digit Bulgarian VAT numbers. total = 0; // First try to calculate the check digit using the first multipliers temp = 0; for (i = 0; i < 8; i++) temp += Number(vatnumber.charAt(i)) * (i + 1); // See if we have a check digit yet total = temp % 11; if (total != 10) { if (total == vatnumber.slice(8)) return true; else return false; } // We got a modulus of 10 before so we have to keep going. Calculate the new check digit using // the different multipliers temp = 0; for (i = 0; i < 8; i++) temp += Number(vatnumber.charAt(i)) * (i + 3); // See if we have a check digit yet. If we still have a modulus of 10, set it to 0. total = temp % 11; if (total == 10) total = 0; if (total == vatnumber.slice(8)) return true; else return false; } // 10 digit VAT code - see if it relates to a standard physical person if ((/^\d\d[0-5]\d[0-3]\d\d{4}$/).test(vatnumber)) { // Check month var month = Number(vatnumber.slice(2, 4)); if ((month > 0 && month < 13) || (month > 20 && month < 33) || (month > 40 && month < 53)) { // Extract the next digit and multiply by the counter. multipliers = [2, 4, 8, 5, 10, 9, 7, 3, 6]; total = 0; for (i = 0; i < 9; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digit. total = total % 11; if (total == 10) total = 0; // Check to see if the check digit given is correct, If not, try next type of person if (total == vatnumber.substr(9, 1)) return true; } } // It doesn't relate to a standard physical person - see if it relates to a foreigner. // Extract the next digit and multiply by the counter. multipliers = [21, 19, 17, 13, 11, 9, 7, 3, 1]; total = 0; for (i = 0; i < 9; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Check to see if the check digit given is correct, If not, try next type of person if (total % 10 == vatnumber.substr(9, 1)) return true; // Finally, if not yet identified, see if it conforms to a miscellaneous VAT number // Extract the next digit and multiply by the counter. multipliers = [4, 3, 2, 7, 6, 5, 4, 3, 2]; total = 0; for (i = 0; i < 9; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digit. total = 11 - total % 11; if (total == 10) return false; if (total == 11) total = 0; // Check to see if the check digit given is correct, If not, we have an error with the VAT number if (total == vatnumber.substr(9, 1)) return true; else return false; } function CHEVATCheckDigit(vatnumber) { // Checks the check digits of a Swiss VAT number. // Extract the next digit and multiply by the counter. var multipliers = [5, 4, 3, 2, 7, 6, 5, 4]; var total = 0; for (var i = 0; i < 8; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digit. total = 11 - total % 11; if (total == 10) return false; if (total == 11) total = 0; // Check to see if the check digit given is correct, If not, we have an error with the VAT number if (total == vatnumber.substr(8, 1)) return true; else return false; } function CYVATCheckDigit(vatnumber) { // Checks the check digits of a Cypriot VAT number. // Not allowed to start with '12' if (Number(vatnumber.slice(0, 2) == 12)) return false; // Extract the next digit and multiply by the counter. var total = 0; for (var i = 0; i < 8; i++) { var temp = Number(vatnumber.charAt(i)); if (i % 2 == 0) { switch (temp) { case 0: temp = 1; break; case 1: temp = 0; break; case 2: temp = 5; break; case 3: temp = 7; break; case 4: temp = 9; break; default: temp = temp * 2 + 3; } } total += temp; } // Establish check digit using modulus 26, and translate to char. equivalent. total = total % 26; total = String.fromCharCode(total + 65); // Check to see if the check digit given is correct if (total == vatnumber.substr(8, 1)) return true; else return false; } function CZVATCheckDigit(vatnumber) { // Checks the check digits of a Czech Republic VAT number. var total = 0; var multipliers = [8, 7, 6, 5, 4, 3, 2]; var czexp = new Array(); czexp[0] = (/^\d{8}$/); // 8 digit legal entities // Note - my specification says that that the following should have a range of 0-3 in the fourth // digit, but the valid number CZ395601439 did not confrm, so a range of 0-9 has been allowed. czexp[1] = (/^[0-5][0-9][0|1|5|6][0-9][0-3][0-9]\d{3}$/); // 9 digit individuals czexp[2] = (/^6\d{8}$/); // 9 digit individuals (Special cases) czexp[3] = (/^\d{2}[0-3|5-8][0-9][0-3][0-9]\d{4}$/); // 10 digit individuals var i = 0; var a; // Legal entities if (czexp[0].test(vatnumber)) { // Extract the next digit and multiply by the counter. for (i = 0; i < 7; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digit. total = 11 - total % 11; if (total == 10) total = 0; if (total == 11) total = 1; // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(7, 8)) return true; else return false; } // Individuals type 1 (Standard) - 9 digits without check digit else if (czexp[1].test(vatnumber)) { if (Number(vatnumber.slice(0, 2)) > 62) return false; return true; } // Individuals type 2 (Special Cases) - 9 digits including check digit else if (czexp[2].test(vatnumber)) { // Extract the next digit and multiply by the counter. for (i = 0; i < 7; i++) total += Number(vatnumber.charAt(i + 1)) * multipliers[i]; // Establish check digit pointer into lookup table if (total % 11 == 0) a = total + 11; else a = Math.ceil(total / 11) * 11; var pointer = a - total; // Convert calculated check digit according to a lookup table; var lookup = [8, 7, 6, 5, 4, 3, 2, 1, 0, 9, 8]; if (lookup[pointer - 1] == vatnumber.slice(8, 9)) return true; else return false; } // Individuals type 3 - 10 digits else if (czexp[3].test(vatnumber)) { var temp = Number(vatnumber.slice(0, 2)) + Number(vatnumber.slice(2, 4)) + Number(vatnumber.slice(4, 6)) + Number(vatnumber.slice(6, 8)) + Number(vatnumber.slice(8)); if (temp % 11 == 0 && Number(vatnumber) % 11 == 0) return true; else return false; } // else error return false; } function DEVATCheckDigit(vatnumber) { // Checks the check digits of a German VAT number. var product = 10; var sum = 0; var checkdigit = 0; for (var i = 0; i < 8; i++) { // Extract the next digit and implement peculiar algorithm!. sum = (Number(vatnumber.charAt(i)) + product) % 10; if (sum == 0) { sum = 10; } product = (2 * sum) % 11; } // Establish check digit. if (11 - product == 10) { checkdigit = 0; } else { checkdigit = 11 - product; } // Compare it with the last two characters of the VAT number. If the same, then it is a valid // check digit. if (checkdigit == vatnumber.slice(8, 9)) return true; else return false; } function DKVATCheckDigit(vatnumber) { // Checks the check digits of a Danish VAT number. var total = 0; var multipliers = [2, 7, 6, 5, 4, 3, 2, 1]; // Extract the next digit and multiply by the counter. for (var i = 0; i < 8; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digit. total = total % 11; // The remainder should be 0 for it to be valid.. if (total == 0) return true; else return false; } function EEVATCheckDigit(vatnumber) { // Checks the check digits of an Estonian VAT number. var total = 0; var multipliers = [3, 7, 1, 3, 7, 1, 3, 7]; // Extract the next digit and multiply by the counter. for (var i = 0; i < 8; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digits using modulus 10. total = 10 - total % 10; if (total == 10) total = 0; // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(8, 9)) return true; else return false; } function ELVATCheckDigit(vatnumber) { // Checks the check digits of a Greek VAT number. var total = 0; var multipliers = [256, 128, 64, 32, 16, 8, 4, 2]; //eight character numbers should be prefixed with an 0. if (vatnumber.length == 8) { vatnumber = "0" + vatnumber; } // Extract the next digit and multiply by the counter. for (var i = 0; i < 8; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digit. total = total % 11; if (total > 9) { total = 0; } // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(8, 9)) return true; else return false; } function ESVATCheckDigit(vatnumber) { // Checks the check digits of a Spanish VAT number. var total = 0; var temp = 0; var multipliers = [2, 1, 2, 1, 2, 1, 2]; var esexp = new Array(); esexp[0] = (/^[A-H|J|U|V]\d{8}$/); esexp[1] = (/^[A-H|N-S|W]\d{7}[A-J]$/); esexp[2] = (/^[0-9|Y|Z]\d{7}[A-Z]$/); esexp[3] = (/^[K|L|M|X]\d{7}[A-Z]$/); var i = 0; // National juridical entities if (esexp[0].test(vatnumber)) { // Extract the next digit and multiply by the counter. for (i = 0; i < 7; i++) { temp = Number(vatnumber.charAt(i + 1)) * multipliers[i]; if (temp > 9) total += Math.floor(temp / 10) + temp % 10; else total += temp; } // Now calculate the check digit itself. total = 10 - total % 10; if (total == 10) { total = 0; } // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(8, 9)) return true; else return false; } // Juridical entities other than national ones else if (esexp[1].test(vatnumber)) { // Extract the next digit and multiply by the counter. for (i = 0; i < 7; i++) { temp = Number(vatnumber.charAt(i + 1)) * multipliers[i]; if (temp > 9) total += Math.floor(temp / 10) + temp % 10; else total += temp; } // Now calculate the check digit itself. total = 10 - total % 10; total = String.fromCharCode(total + 64); // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(8, 9)) return true; else return false; } // Personal number (NIF) (starting with numeric of Y or Z) else if (esexp[2].test(vatnumber)) { var tempnumber = vatnumber; if (tempnumber.substring(0, 1) == 'Y') tempnumber = tempnumber.replace(/Y/, "1"); if (tempnumber.substring(0, 1) == 'Z') tempnumber = tempnumber.replace(/Z/, "2"); return tempnumber.charAt(8) == 'TRWAGMYFPDXBNJZSQVHLCKE'.charAt(Number(tempnumber.substring(0, 8)) % 23); } // Personal number (NIF) (starting with K, L, M, or X) else if (esexp[3].test(vatnumber)) { return vatnumber.charAt(8) == 'TRWAGMYFPDXBNJZSQVHLCKE'.charAt(Number(vatnumber.substring(1, 8)) % 23); } else return false; } function EUVATCheckDigit(vatnumber) { // We know little about EU numbers apart from the fact that the first 3 digits represent the // country, and that there are nine digits in total. return true; } function FIVATCheckDigit(vatnumber) { // Checks the check digits of a Finnish VAT number. var total = 0; var multipliers = [7, 9, 10, 5, 8, 4, 2]; // Extract the next digit and multiply by the counter. for (var i = 0; i < 7; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digit. total = 11 - total % 11; if (total > 9) { total = 0; } // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(7, 8)) return true; else return false; } function FRVATCheckDigit(vatnumber) { // Checks the check digits of a French VAT number. if (!(/^\d{11}$/).test(vatnumber)) return true; // Extract the last nine digits as an integer. var total = vatnumber.substring(2); // Establish check digit. total = (total * 100 + 12) % 97; // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(0, 2)) return true; else return false; } function GBVATCheckDigit(vatnumber) { // Checks the check digits of a UK VAT number. var multipliers = [8, 7, 6, 5, 4, 3, 2]; // Government departments if (vatnumber.substr(0, 2) == 'GD') { if (vatnumber.substr(2, 3) < 500) return true; else return false; } // Health authorities if (vatnumber.substr(0, 2) == 'HA') { if (vatnumber.substr(2, 3) > 499) return true; else return false; } // Standard and commercial numbers var total = 0; // 0 VAT numbers disallowed! if (Number(vatnumber.slice(0)) == 0) return false; // Check range is OK for modulus 97 calculation var no = Number(vatnumber.slice(0, 7)); // Extract the next digit and multiply by the counter. for (var i = 0; i < 7; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Old numbers use a simple 97 modulus, but new numbers use an adaptation of that (less 55). Our // VAT number could use either system, so we check it against both. // Establish check digits by subtracting 97 from total until negative. var cd = total; while (cd > 0) { cd = cd - 97; } // Get the absolute value and compare it with the last two characters of the VAT number. If the // same, then it is a valid traditional check digit. However, even then the number must fit within // certain specified ranges. cd = Math.abs(cd); if (cd == vatnumber.slice(7, 9) && no < 9990001 && (no < 100000 || no > 999999) && (no < 9490001 || no > 9700000)) return true; // Now try the new method by subtracting 55 from the check digit if we can - else add 42 if (cd >= 55) cd = cd - 55; else cd = cd + 42; if (cd == vatnumber.slice(7, 9) && no > 1000000) return true; else return false; } function HRVATCheckDigit(vatnumber) { // Checks the check digits of a Croatian VAT number using ISO 7064, MOD 11-10 for check digit. var product = 10; var sum = 0; var checkdigit = 0; for (var i = 0; i < 10; i++) { // Extract the next digit and implement the algorithm sum = (Number(vatnumber.charAt(i)) + product) % 10; if (sum == 0) { sum = 10; } product = (2 * sum) % 11; } // Now check that we have the right check digit if ((product + vatnumber.slice(10, 11) * 1) % 10 == 1) return true; else return false; } function HUVATCheckDigit(vatnumber) { // Checks the check digits of a Hungarian VAT number. var total = 0; var multipliers = [9, 7, 3, 1, 9, 7, 3]; // Extract the next digit and multiply by the counter. for (var i = 0; i < 7; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digit. total = 10 - total % 10; if (total == 10) total = 0; // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(7, 8)) return true; else return false; } function IEVATCheckDigit(vatnumber) { // Checks the check digits of an Irish VAT number. var total = 0; var multipliers = [8, 7, 6, 5, 4, 3, 2]; // If the code is type 1 format, we need to convert it to the new before performing the validation. if (/^\d[A-Z\*\+]/.test(vatnumber)) vatnumber = "0" + vatnumber.substring(2, 7) + vatnumber.substring(0, 1) + vatnumber.substring(7, 8); // Extract the next digit and multiply by the counter. for (var i = 0; i < 7; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // If the number is type 3 then we need to include the trailing A or H in the calculation if (/^\d{7}[A-Z][AH]$/.test(vatnumber)) { // Add in a multiplier for the character A (1*9=9) or H (8*9=72) if (vatnumber.charAt(8) == 'H') total += 72; else total += 9; } // Establish check digit using modulus 23, and translate to char. equivalent. total = total % 23; if (total == 0) total = "W"; else total = String.fromCharCode(total + 64); // Compare it with the eighth character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(7, 8)) return true; else return false; } function ITVATCheckDigit(vatnumber) { // Checks the check digits of an Italian VAT number. var total = 0; var multipliers = [1, 2, 1, 2, 1, 2, 1, 2, 1, 2]; var temp; // The last three digits are the issuing office, and cannot exceed more 201, unless 999 or 888 if (Number(vatnumber.slice(0, 7)) == 0) return false; temp = Number(vatnumber.slice(7, 10)); if ((temp < 1) || (temp > 201) && temp != 999 && temp != 888) return false; // Extract the next digit and multiply by the appropriate for (var i = 0; i < 10; i++) { temp = Number(vatnumber.charAt(i)) * multipliers[i]; if (temp > 9) total += Math.floor(temp / 10) + temp % 10; else total += temp; } // Establish check digit. total = 10 - total % 10; if (total > 9) { total = 0; } // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(10, 11)) return true; else return false; } function LTVATCheckDigit(vatnumber) { // Checks the check digits of a Lithuanian VAT number. var total, multipliers, i; // 9 character VAT numbers are for legal persons if (vatnumber.length == 9) { // 8th character must be one if (!(/^\d{7}1/).test(vatnumber)) return false; // Extract the next digit and multiply by the counter+1. total = 0; for (i = 0; i < 8; i++) total += Number(vatnumber.charAt(i)) * (i + 1); // Can have a double check digit calculation! if (total % 11 == 10) { multipliers = [3, 4, 5, 6, 7, 8, 9, 1]; total = 0; for (i = 0; i < 8; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; } // Establish check digit. total = total % 11; if (total == 10) { total = 0; } // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(8, 9)) return true; else return false; } // 12 character VAT numbers are for temporarily registered taxpayers else { // 11th character must be one if (!(/^\d{10}1/).test(vatnumber)) return false; // Extract the next digit and multiply by the counter+1. total = 0; multipliers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2]; for (i = 0; i < 11; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Can have a double check digit calculation! if (total % 11 == 10) { multipliers = [3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 4]; total = 0; for (i = 0; i < 11; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; } // Establish check digit. total = total % 11; if (total == 10) { total = 0; } // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(11, 12)) return true; else return false; } } function LUVATCheckDigit(vatnumber) { // Checks the check digits of a Luxembourg VAT number. if (vatnumber.slice(0, 6) % 89 == vatnumber.slice(6, 8)) return true; else return false; } function LVVATCheckDigit(vatnumber) { // Checks the check digits of a Latvian VAT number. // Differentiate between legal entities and natural bodies. For the latter we simply check that // the first six digits correspond to valid DDMMYY dates. if ((/^[0-3]/).test(vatnumber)) { if ((/^[0-3][0-9][0-1][0-9]/).test(vatnumber)) return true; else return false; } else { var total = 0; var multipliers = [9, 1, 4, 8, 3, 10, 2, 5, 7, 6]; // Extract the next digit and multiply by the counter. for (var i = 0; i < 10; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digits by getting modulus 11. if (total % 11 == 4 && vatnumber[0] == 9) total = total - 45; if (total % 11 == 4) total = 4 - total % 11; else if (total % 11 > 4) total = 14 - total % 11; else if (total % 11 < 4) total = 3 - total % 11; // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(10, 11)) return true; else return false; } } function MTVATCheckDigit(vatnumber) { // Checks the check digits of a Maltese VAT number. var total = 0; var multipliers = [3, 4, 6, 7, 8, 9]; // Extract the next digit and multiply by the counter. for (var i = 0; i < 6; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digits by getting modulus 37. total = 37 - total % 37; // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(6, 8) * 1) return true; else return false; } function NLVATCheckDigit(vatnumber) { // Checks the check digits of a Dutch VAT number. var total = 0; var multipliers = [9, 8, 7, 6, 5, 4, 3, 2]; // Extract the next digit and multiply by the counter. for (var i = 0; i < 8; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digits by getting modulus 11. total = total % 11; if (total > 9) { total = 0; } // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(8, 9)) return true; else return false; } function NOVATCheckDigit(vatnumber) { // Checks the check digits of a Norwegian VAT number. // See http://www.brreg.no/english/coordination/number.html var total = 0; var multipliers = [3, 2, 7, 6, 5, 4, 3, 2]; // Extract the next digit and multiply by the counter. for (var i = 0; i < 8; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digits by getting modulus 11. Check digits > 9 are invalid total = 11 - total % 11; if (total == 11) { total = 0; } if (total < 10) { // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(8, 9)) return true; else return false; } } function PLVATCheckDigit(vatnumber) { // Checks the check digits of a Polish VAT number. var total = 0; var multipliers = [6, 5, 7, 2, 3, 4, 5, 6, 7]; // Extract the next digit and multiply by the counter. for (var i = 0; i < 9; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digits subtracting modulus 11 from 11. total = total % 11; if (total > 9) { total = 0; } // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(9, 10)) return true; else return false; } function PTVATCheckDigit(vatnumber) { // Checks the check digits of a Portugese VAT number. var total = 0; var multipliers = [9, 8, 7, 6, 5, 4, 3, 2]; // Extract the next digit and multiply by the counter. for (var i = 0; i < 8; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digits subtracting modulus 11 from 11. total = 11 - total % 11; if (total > 9) { total = 0; } // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(8, 9)) return true; else return false; } function ROVATCheckDigit(vatnumber) { // Checks the check digits of a Romanian VAT number. var multipliers = [7, 5, 3, 2, 1, 7, 5, 3, 2]; // Extract the next digit and multiply by the counter. var VATlen = vatnumber.length; multipliers = multipliers.slice(10 - VATlen); var total = 0; for (var i = 0; i < vatnumber.length - 1; i++) { total += Number(vatnumber.charAt(i)) * multipliers[i]; } // Establish check digits by getting modulus 11. total = (10 * total) % 11; if (total == 10) total = 0; // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (total == vatnumber.slice(vatnumber.length - 1, vatnumber.length)) return true; else return false; } function RSVATCheckDigit(vatnumber) { // Checks the check digits of a Serbian VAT number using ISO 7064, MOD 11-10 for check digit. var product = 10; var sum = 0; var checkdigit = 0; for (var i = 0; i < 8; i++) { // Extract the next digit and implement the algorithm sum = (Number(vatnumber.charAt(i)) + product) % 10; if (sum == 0) { sum = 10; } product = (2 * sum) % 11; } // Now check that we have the right check digit if ((product + vatnumber.slice(8, 9) * 1) % 10 == 1) return true; else return false; } function RUVATCheckDigit(vatnumber) { // Checks the check digits of a Russian INN number // See http://russianpartner.biz/test_inn.html for algorithm var i; // 10 digit INN numbers if (vatnumber.length == 10) { var total = 0; var multipliers = [2, 4, 10, 3, 5, 9, 4, 6, 8, 0]; for (i = 0; i < 10; i++) { total += Number(vatnumber.charAt(i)) * multipliers[i]; } total = total % 11; if (total > 9) { total = total % 10; } // Compare it with the last character of the VAT number. If it is the same, then it's valid if (total == vatnumber.slice(9, 10)) return true; else return false; // 12 digit INN numbers } else if (vatnumber.length == 12) { var total1 = 0; var multipliers1 = [7, 2, 4, 10, 3, 5, 9, 4, 6, 8, 0]; var total2 = 0; var multipliers2 = [3, 7, 2, 4, 10, 3, 5, 9, 4, 6, 8, 0]; for (i = 0; i < 11; i++) total1 += Number(vatnumber.charAt(i)) * multipliers1[i]; total1 = total1 % 11; if (total1 > 9) { total1 = total1 % 10; } for (i = 0; i < 11; i++) total2 += Number(vatnumber.charAt(i)) * multipliers2[i]; total2 = total2 % 11; if (total2 > 9) { total2 = total2 % 10; } // Compare the first check with the 11th character and the second check with the 12th and last // character of the VAT number. If they're both the same, then it's valid if ((total1 == vatnumber.slice(10, 11)) && (total2 == vatnumber.slice(11, 12))) return true; else return false; } } function SEVATCheckDigit(vatnumber) { var i; // Calculate R where R = R1 + R3 + R5 + R7 + R9, and Ri = INT(Ci/5) + (Ci*2) modulo 10 var R = 0; var digit; for (i = 0; i < 9; i = i + 2) { digit = Number(vatnumber.charAt(i)); R += Math.floor(digit / 5) + ((digit * 2) % 10); } // Calculate S where S = C2 + C4 + C6 + C8 var S = 0; for (i = 1; i < 9; i = i + 2) S += Number(vatnumber.charAt(i)); // Calculate the Check Digit var cd = (10 - (R + S) % 10) % 10; // Compare it with the last character of the VAT number. If it's the same, then it's valid. if (cd == vatnumber.slice(9, 10)) return true; else return false; } function SIVATCheckDigit(vatnumber) { // Checks the check digits of a Slovenian VAT number. var total = 0; var multipliers = [8, 7, 6, 5, 4, 3, 2]; // Extract the next digit and multiply by the counter. for (var i = 0; i < 7; i++) total += Number(vatnumber.charAt(i)) * multipliers[i]; // Establish check digits using modulus 11 total = 11 - total % 11; if (total == 10) { total = 0; } // Compare the number with the last character of the VAT number. If it is the // same, then it's a valid check digit. if (total != 11 && total == vatnumber.slice(7, 8)) return true; else return false; } function SKVATCheckDigit(vatnumber) { // Checks the check digits of a Slovakian VAT number. // Check that the modulus of the whole VAT number is 0 - else error if (Number(vatnumber % 11) == 0) return true; else return false; } XIVATCheckDigit = GBVATCheckDigit; // Northern Ireland VAT numbers follow the same rules as GB return checkVATNumber; })();