diff --git a/additional-methods.js b/additional-methods.js
index a133df787..87a932425 100644
--- a/additional-methods.js
+++ b/additional-methods.js
@@ -157,6 +157,128 @@ jQuery.validator.addMethod("dateNL", function(value, element) {
 	return this.optional(element) || /^(0?[1-9]|[12]\d|3[01])[\.\/\-](0?[1-9]|1[012])[\.\/\-]([12]\d)?(\d\d)$/.test(value);
 }, "Vul hier een geldige datum in.");
 
+/**
+ * IBAN is the international bank account number. 
+ * It has a country - specific format, that is checked here too 
+ */
+jQuery.validator.addMethod("iban", function(value, element) {
+	// some quick simple tests to prevent needless work
+	if (this.optional(element)) {
+		return true;
+	}
+	if (!(/^([a-zA-Z0-9]{4} ){2,8}[a-zA-Z0-9]{1,4}|[a-zA-Z0-9]{12,34}$/.test(value))) {
+		return false;
+	}
+	
+	// check the country code and find the country specific format
+	var iban = value.replace(/ /g,'').toUpperCase(); // remove spaces and to upper case
+	var countrycode = iban.substring(0,2);
+	var bbancountrypatterns = {
+		'AL': "\\d{8}[\\dA-Z]{16}",
+		'AD': "\\d{8}[\\dA-Z]{12}",
+		'AT': "\\d{16}",
+		'AZ': "[\\dA-Z]{4}\\d{20}",
+		'BE': "\\d{12}",
+		'BH': "[A-Z]{4}[\\dA-Z]{14}",
+		'BA': "\\d{16}",
+		'BR': "\\d{23}[A-Z][\\dA-Z]",
+		'BG': "[A-Z]{4}\\d{6}[\\dA-Z]{8}",
+		'CR': "\\d{17}",
+		'HR': "\\d{17}",
+		'CY': "\\d{8}[\\dA-Z]{16}",
+		'CZ': "\\d{20}",
+		'DK': "\\d{14}",
+		'DO': "[A-Z]{4}\\d{20}",
+		'EE': "\\d{16}",
+		'FO': "\\d{14}",
+		'FI': "\\d{14}",
+		'FR': "\\d{10}[\\dA-Z]{11}\\d{2}",
+		'GE': "[\\dA-Z]{2}\\d{16}",
+		'DE': "\\d{18}",
+		'GI': "[A-Z]{4}[\\dA-Z]{15}",
+		'GR': "\\d{7}[\\dA-Z]{16}",
+		'GL': "\\d{14}",
+		'GT': "[\\dA-Z]{4}[\\dA-Z]{20}",
+		'HU': "\\d{24}",
+		'IS': "\\d{22}",
+		'IE': "[\\dA-Z]{4}\\d{14}",
+		'IL': "\\d{19}",
+		'IT': "[A-Z]\\d{10}[\\dA-Z]{12}",
+		'KZ': "\\d{3}[\\dA-Z]{13}",
+		'KW': "[A-Z]{4}[\\dA-Z]{22}",
+		'LV': "[A-Z]{4}[\\dA-Z]{13}",
+		'LB': "\\d{4}[\\dA-Z]{20}",
+		'LI': "\\d{5}[\\dA-Z]{12}",
+		'LT': "\\d{16}",
+		'LU': "\\d{3}[\\dA-Z]{13}",
+		'MK': "\\d{3}[\\dA-Z]{10}\\d{2}",
+		'MT': "[A-Z]{4}\\d{5}[\\dA-Z]{18}",
+		'MR': "\\d{23}",
+		'MU': "[A-Z]{4}\\d{19}[A-Z]{3}",
+		'MC': "\\d{10}[\\dA-Z]{11}\\d{2}",
+		'MD': "[\\dA-Z]{2}\\d{18}",
+		'ME': "\\d{18}",
+		'NL': "[A-Z]{4}\\d{10}",
+		'NO': "\\d{11}",
+		'PK': "[\\dA-Z]{4}\\d{16}",
+		'PS': "[\\dA-Z]{4}\\d{21}",
+		'PL': "\\d{24}",
+		'PT': "\\d{21}",
+		'RO': "[A-Z]{4}[\\dA-Z]{16}",
+		'SM': "[A-Z]\\d{10}[\\dA-Z]{12}",
+		'SA': "\\d{2}[\\dA-Z]{18}",
+		'RS': "\\d{18}",
+		'SK': "\\d{20}",
+		'SI': "\\d{15}",
+		'ES': "\\d{20}",
+		'SE': "\\d{20}",
+		'CH': "\\d{5}[\\dA-Z]{12}",
+		'TN': "\\d{20}",
+		'TR': "\\d{5}[\\dA-Z]{17}",
+		'AE': "\\d{3}\\d{16}",
+		'GB': "[A-Z]{4}\\d{14}",
+		'VG': "[\\dA-Z]{4}\\d{16}"
+	};
+	var bbanpattern = bbancountrypatterns[countrycode];
+	// As new countries will start using IBAN in the
+	// future, we only check if the countrycode is known.
+	// This prevents false negatives, while almost all
+	// false positives introduced by this, will be caught
+	// by the checksum validation below anyway.
+	// Strict checking should return FALSE for unknown 
+	// countries.
+	if (typeof bbanpattern !== 'undefined') {
+		var ibanregexp = new RegExp("^[A-Z]{2}\\d{2}" + bbanpattern + "$", "");
+		if (!(ibanregexp.test(iban))) {
+			return false; // invalid country specific format
+		}
+	}
+	
+	// now check the checksum, first convert to digits
+	var ibancheck = iban.substring(4,iban.length) + iban.substring(0,4);
+	var ibancheckdigits = "";
+	var leadingZeroes = true;
+	for (var i =0; i<ibancheck.length; i++) {
+		var char = ibancheck.charAt(i);
+		if (char !== "0") {
+			leadingZeroes = false;
+		}
+		if (!leadingZeroes) {
+			ibancheckdigits += "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ".indexOf(char);
+		}
+	}
+
+	// calculate the result of: ibancheckdigits % 97
+    var cRest = '';
+    var cOperator = '';
+	for (var p=0; p<ibancheckdigits.length; p++) {
+		var cChar = ibancheckdigits.charAt(p);
+		cOperator = '' + cRest + '' + cChar;
+		cRest = cOperator % 97;
+    }
+	return cRest === 1;
+}, "Please specify a valid IBAN");
+
 jQuery.validator.addMethod("time", function(value, element) {
 	return this.optional(element) || /^([01]\d|2[0-3])(:[0-5]\d){1,2}$/.test(value);
 }, "Please enter a valid time, between 00:00 and 23:59");
diff --git a/localization/messages_nl.js b/localization/messages_nl.js
index dd16be28f..13efbf387 100644
--- a/localization/messages_nl.js
+++ b/localization/messages_nl.js
@@ -20,6 +20,9 @@
 		rangelength: $.validator.format("Vul hier een waarde in van minimaal {0} en maximaal {1} tekens."),
 		range: $.validator.format("Vul hier een waarde in van minimaal {0} en maximaal {1}."),
 		max: $.validator.format("Vul hier een waarde in kleiner dan of gelijk aan {0}."),
-		min: $.validator.format("Vul hier een waarde in groter dan of gelijk aan {0}.")
+		min: $.validator.format("Vul hier een waarde in groter dan of gelijk aan {0}."),
+		
+		// for validations in additional-methods.js
+		iban: "Vul hier een geldig IBAN in."
 	});
 }(jQuery));
\ No newline at end of file
diff --git a/test/methods.js b/test/methods.js
index 36ddde727..43b8f756a 100644
--- a/test/methods.js
+++ b/test/methods.js
@@ -590,6 +590,83 @@ test("dateNL", function() {
 	ok(!method( "01.01.190" ), "Invalid date NL" );
 });
 
+test("iban", function() {
+	var method = methodTest("iban");
+	ok( method( "NL20INGB0001234567"), "Valid IBAN");
+	ok( method( "DE68 2105 0170 0012 3456 78"), "Valid IBAN");
+	ok( method( "NL20 INGB0001234567"), "Valid IBAN: invalid spacing");
+	ok( method( "NL20 INGB 00 0123 4567"), "Valid IBAN: invalid spacing");
+	ok( method( "XX40INGB000123456712341234"), "Valid (more or less) IBAN: unknown country, but checksum OK");
+	
+	ok(!method( "NL20INGB000123456"), "Invalid IBAN: too short");
+	ok(!method( "NL20INGB00012345678"), "Invalid IBAN: too long");
+	ok(!method( "NL20INGB0001234566"), "Invalid IBAN: checksum incorrect");
+	ok(!method( "DE68 2105 0170 0012 3456 7"), "Invalid IBAN: too short");
+	ok(!method( "DE68 2105 0170 0012 3456 789"), "Invalid IBAN: too long");
+	ok(!method( "DE68 2105 0170 0012 3456 79"), "Invalid IBAN: checksum incorrect");
+
+	ok(!method( "NL54INGB00012345671234"), "Invalid IBAN too long, BUT CORRECT CHECKSUM");
+	ok(!method( "XX00INGB000123456712341234"), "Invalid IBAN: unknown country and checksum incorrect");
+
+	// sample IBANs for different countries
+	ok( method( "AL47 2121 1009 0000 0002 3569 8741"), "Valid IBAN - AL");
+	ok( method( "AD12 0001 2030 2003 5910 0100"), "Valid IBAN - AD");
+	ok( method( "AT61 1904 3002 3457 3201"), "Valid IBAN - AT");
+	ok( method( "AZ21 NABZ 0000 0000 1370 1000 1944"), "Valid IBAN - AZ");
+	ok( method( "BH67 BMAG 0000 1299 1234 56"), "Valid IBAN - BH");
+	ok( method( "BE62 5100 0754 7061"), "Valid IBAN - BE");
+	ok( method( "BA39 1290 0794 0102 8494"), "Valid IBAN - BA");
+	ok( method( "BG80 BNBG 9661 1020 3456 78"), "Valid IBAN - BG");
+	ok( method( "HR12 1001 0051 8630 0016 0"), "Valid IBAN - HR");
+	ok( method( "CH93 0076 2011 6238 5295 7"), "Valid IBAN - CH");
+	ok( method( "CY17 0020 0128 0000 0012 0052 7600"), "Valid IBAN - CY");
+	ok( method( "CZ65 0800 0000 1920 0014 5399"), "Valid IBAN - CZ");
+	ok( method( "DK50 0040 0440 1162 43"), "Valid IBAN - DK");
+	ok( method( "EE38 2200 2210 2014 5685"), "Valid IBAN - EE");
+	ok( method( "FO97 5432 0388 8999 44"), "Valid IBAN - FO");
+	ok( method( "FI21 1234 5600 0007 85"), "Valid IBAN - FI");
+	ok( method( "FR14 2004 1010 0505 0001 3M02 606"), "Valid IBAN - FR");
+	ok( method( "GE29 NB00 0000 0101 9049 17"), "Valid IBAN - GE");
+	ok( method( "DE89 3704 0044 0532 0130 00"), "Valid IBAN - DE");
+	ok( method( "GI75 NWBK 0000 0000 7099 453"), "Valid IBAN - GI");
+	ok( method( "GR16 0110 1250 0000 0001 2300 695"), "Valid IBAN - GR");
+	ok( method( "GL56 0444 9876 5432 10"), "Valid IBAN - GL");
+	ok( method( "HU42 1177 3016 1111 1018 0000 0000"), "Valid IBAN - HU");
+	ok( method( "IS14 0159 2600 7654 5510 7303 39"), "Valid IBAN - IS");
+	ok( method( "IE29 AIBK 9311 5212 3456 78"), "Valid IBAN - IE");
+	ok( method( "IL62 0108 0000 0009 9999 999"), "Valid IBAN - IL");
+	ok( method( "IT40 S054 2811 1010 0000 0123 456"), "Valid IBAN - IT");
+	ok( method( "LV80 BANK 0000 4351 9500 1"), "Valid IBAN - LV");
+	ok( method( "LB62 0999 0000 0001 0019 0122 9114"), "Valid IBAN - LB");
+	ok( method( "LI21 0881 0000 2324 013A A"), "Valid IBAN - LI");
+	ok( method( "LT12 1000 0111 0100 1000"), "Valid IBAN - LT");
+	ok( method( "LU28 0019 4006 4475 0000"), "Valid IBAN - LU");
+	ok( method( "MK07 2501 2000 0058 984"), "Valid IBAN - MK");
+	ok( method( "MT84 MALT 0110 0001 2345 MTLC AST0 01S"), "Valid IBAN - MT");
+	ok( method( "MU17 BOMM 0101 1010 3030 0200 000M UR"), "Valid IBAN - MU");
+	ok( method( "MD24 AG00 0225 1000 1310 4168"), "Valid IBAN - MD");
+	ok( method( "MC93 2005 2222 1001 1223 3M44 555"), "Valid IBAN - MC");
+	ok( method( "ME25 5050 0001 2345 6789 51"), "Valid IBAN - ME");
+	ok( method( "NL39 RABO 0300 0652 64"), "Valid IBAN - NL");
+	ok( method( "NO93 8601 1117 947"), "Valid IBAN - NO");
+	ok( method( "PK36 SCBL 0000 0011 2345 6702"), "Valid IBAN - PK");
+	ok( method( "PL60 1020 1026 0000 0422 7020 1111"), "Valid IBAN - PL");
+	ok( method( "PT50 0002 0123 1234 5678 9015 4"), "Valid IBAN - PT");
+	ok( method( "RO49 AAAA 1B31 0075 9384 0000"), "Valid IBAN - RO");
+	ok( method( "SM86 U032 2509 8000 0000 0270 100"), "Valid IBAN - SM");
+	ok( method( "SA03 8000 0000 6080 1016 7519"), "Valid IBAN - SA");
+	ok( method( "RS35 2600 0560 1001 6113 79"), "Valid IBAN - RS");
+	ok( method( "SK31 1200 0000 1987 4263 7541"), "Valid IBAN - SK");
+	ok( method( "SI56 1910 0000 0123 438"), "Valid IBAN - SI");
+	ok( method( "ES80 2310 0001 1800 0001 2345"), "Valid IBAN - ES");
+	ok( method( "SE35 5000 0000 0549 1000 0003"), "Valid IBAN - SE");
+	ok( method( "CH93 0076 2011 6238 5295 7"), "Valid IBAN - CH");
+	ok( method( "TN59 1000 6035 1835 9847 8831"), "Valid IBAN - TN");
+	ok( method( "TR33 0006 1005 1978 6457 8413 26"), "Valid IBAN - TR");
+	ok( method( "AE07 0331 2345 6789 0123 456"), "Valid IBAN - AE");
+	ok( method( "GB29 NWBK 6016 1331 9268 19"), "Valid IBAN - GB");
+});
+
 test("time", function() {
 	var method = methodTest("time");
 	ok( method("00:00"), "Valid time, lower bound" );