{"id":6484,"date":"2026-02-06T10:48:49","date_gmt":"2026-02-06T08:48:49","guid":{"rendered":"https:\/\/taxblock.forthright.gr\/vat-validity-check\/"},"modified":"2026-03-26T10:28:28","modified_gmt":"2026-03-26T08:28:28","slug":"vat-validity-check","status":"publish","type":"page","link":"https:\/\/taxblock.forthright.gr\/en\/vat-validity-check\/","title":{"rendered":"VAT validity check"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"6484\" class=\"elementor elementor-6484 elementor-4765\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-92c9ba3 e-flex e-con-boxed e-con e-parent\" data-id=\"92c9ba3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-4299b5e e-con-full e-flex e-con e-child\" data-id=\"4299b5e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-39d2e88 elementor-widget elementor-widget-html\" data-id=\"39d2e88\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<div class=\"afm-validator-container\">\n    <p>Fill in the VAT number you want to be checked<\/p>\n    <input type=\"text\" id=\"afm-input\" placeholder=\"e.g. 123456789\" maxlength=\"9\" class=\"afm-input-field\">\n    <p id=\"afm-result\" style=\"margin-top: 10px; font-weight: 600; min-height: 1.5em;\"><\/p>\n<\/div>\n\n<style>\n    .afm-validator-container {\n        padding: 20px;\n        border-radius: 8px;\n    }\n    .afm-input-field {\n        width: 100%;\n        padding: 10px;\n        border: 1px solid #ccc;\n        border-radius: 4px;\n        font-size: 16px;\n    }\n    .valid-afm { color: #28a745; }\n    .invalid-afm { color: #dc3545; }\n<\/style>\n\n<script>\ndocument.getElementById('afm-input').addEventListener('input', function(e) {\n    const afm = e.target.value.trim();\n    const resultElement = document.getElementById('afm-result');\n    \n    \/\/ \u039a\u03b1\u03b8\u03b1\u03c1\u03b9\u03c3\u03bc\u03cc\u03c2 \u03b1\u03bd \u03b5\u03af\u03bd\u03b1\u03b9 \u03ac\u03b4\u03b5\u03b9\u03bf\n    if (afm === \"\") {\n        resultElement.innerText = \"\";\n        return;\n    }\n\n    \/\/ \u0392\u03b1\u03c3\u03b9\u03ba\u03cc\u03c2 \u03ad\u03bb\u03b5\u03b3\u03c7\u03bf\u03c2: 9 \u03c8\u03b7\u03c6\u03af\u03b1 \u03ba\u03b1\u03b9 \u03bc\u03cc\u03bd\u03bf \u03bd\u03bf\u03cd\u03bc\u03b5\u03c1\u03b1\n    if (!\/^\\d{9}$\/.test(afm)) {\n        resultElement.innerText = \"\u03a4\u03bf \u0391\u03a6\u039c \u03c0\u03c1\u03ad\u03c0\u03b5\u03b9 \u03bd\u03b1 \u03ad\u03c7\u03b5\u03b9 \u03b1\u03ba\u03c1\u03b9\u03b2\u03ce\u03c2 9 \u03c8\u03b7\u03c6\u03af\u03b1.\";\n        resultElement.className = \"invalid-afm\";\n        return;\n    }\n\n    \/\/ \u039f \u03b1\u03bb\u03b3\u03cc\u03c1\u03b9\u03b8\u03bc\u03bf\u03c2 \u03b5\u03b3\u03ba\u03c5\u03c1\u03cc\u03c4\u03b7\u03c4\u03b1\u03c2 (Modulo 11)\n    let sum = 0;\n    for (let i = 0; i < 8; i++) {\n        sum += parseInt(afm.charAt(i)) * Math.pow(2, 8 - i);\n    }\n    \n    let remainder = sum % 11;\n    let checkDigit = remainder === 10 ? 0 : remainder;\n\n    if (checkDigit === parseInt(afm.charAt(8))) {\n        resultElement.innerText = \"\u2705 \u03a4\u03bf \u0391\u03a6\u039c \u03b5\u03af\u03bd\u03b1\u03b9 \u03ad\u03b3\u03ba\u03c5\u03c1\u03bf.\";\n        resultElement.className = \"valid-afm\";\n    } else {\n        resultElement.innerText = \"\u274c \u03a4\u03bf \u0391\u03a6\u039c \u03b4\u03b5\u03bd \u03b5\u03af\u03bd\u03b1\u03b9 \u03ad\u03b3\u03ba\u03c5\u03c1\u03bf.\";\n        resultElement.className = \"invalid-afm\";\n    }\n});\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d7c0b08 e-con-full e-flex e-con e-child\" data-id=\"d7c0b08\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d1033b9 elementor-widget elementor-widget-text-editor\" data-id=\"d1033b9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div class=\"met_page_wrapper\"><div class=\"met_content\"><div id=\"post-447\" class=\"entry-content single-page post-447 page type-page status-publish hentry\"><div id=\"dslc-theme-content\"><div id=\"dslc-theme-content-inner\"><div class=\"gsis-content\">Fill in the VAT number you want to check in the form on the left, and you will immediately see if the VAT number is valid.  <em>ATTENTION! The check is made on the validity of the VAT number in terms of its composition. A VAT number may be valid but not yet assigned to a person.  <\/em><\/div><\/div><\/div><div> <\/div><\/div><\/div><\/div><div class=\"footer_wrap\"><footer class=\"footer\"><div class=\"met_content\"><div class=\"row\"><div class=\"col-md-4 clear_margin_bottom\"><div id=\"nav_menu-2\" class=\"met_sidebar_box clearfix widget_nav_menu sidebar-widget footer-widget widget_nav_menu\"> <\/div><\/div><\/div><\/div><\/footer><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Fill in the VAT number you want to be checked Fill in the VAT number you want to check in the form on the left, and you will immediately see if the VAT number is valid. ATTENTION! The check is made on the validity of the VAT number in terms of its composition. A VAT [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-6484","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>VAT validity check - Taxblock<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"VAT validity check - Taxblock\" \/>\n<meta property=\"og:description\" content=\"Fill in the VAT number you want to be checked Fill in the VAT number you want to check in the form on the left, and you will immediately see if the VAT number is valid. 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