{"id":19816,"date":"2026-09-07T13:55:49","date_gmt":"2026-09-07T08:25:49","guid":{"rendered":"https:\/\/befreeltd.com\/uk\/?p=19816"},"modified":"2026-09-17T14:23:00","modified_gmt":"2026-09-17T08:53:00","slug":"ot-tax-code","status":"publish","type":"post","link":"https:\/\/befreeltd.com\/uk\/resources\/blogs\/ot-tax-code\/","title":{"rendered":"OT Tax Codes: The Capacity Problem Behind the Accuracy Problem"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"19816\" class=\"elementor elementor-19816\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6c34a537 e-flex e-con-boxed e-con e-parent\" data-id=\"6c34a537\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-67797eaf elementor-widget elementor-widget-text-editor\" data-id=\"67797eaf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\tAn OT tax code means an employee is being taxed on their full income with no personal allowance applied, usually because HMRC or the employer lacks the information needed to assign the correct code. For accountants, the code itself is simple to explain. What is harder to manage is the volume of client queries it generates during onboarding and payroll transition periods, precisely when capacity is already stretched.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7c21b564 elementor-widget elementor-widget-heading\" data-id=\"7c21b564\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What Is an OT Tax Code?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d0b9d9b elementor-widget elementor-widget-text-editor\" data-id=\"d0b9d9b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>An OT tax code tells an employer to apply Income Tax across all of an employee&#8217;s pay, with no tax-free personal allowance deducted first. It is typically triggered when:<\/p><ul><li>A new starter has not provided a P45 or completed a starter checklist<\/li><li>An employee has used up their personal allowance elsewhere<\/li><li>HMRC has insufficient information to issue a specific code<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a6e71ab elementor-widget elementor-widget-text-editor\" data-id=\"a6e71ab\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\tUnlike emergency codes, an OT code is not automatically temporary. It can persist until HMRC or the employer receives the missing detail, which means employees can be significantly overtaxed for longer than they expect.\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-aa2f411 elementor-widget elementor-widget-heading\" data-id=\"aa2f411\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What Is the Difference Between OT, OT W1 and OT 1 Tax Code?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b1c78f9 elementor-widget elementor-widget-text-editor\" data-id=\"b1c78f9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>The core code is the same. The suffix determines how it is calculated.<\/p><p>An OT W1 tax code (or OT M1, for monthly earners) applies the code on a non-cumulative basis. Tax is calculated on that single pay period alone, ignoring year-to-date earnings. This is common when someone starts a new job partway through a tax year, and HMRC wants to avoid under- or overtaxing them based on incomplete records.<\/p><p>Clients sometimes refer to this informally as an OT 1 tax code, though this is not an official HMRC designation. It is generally shorthand for OT W1 or OT M1, and accountants fielding the query should clarify which pay basis actually applies before advising further, since the practical effect on take-home pay differs by pay frequency.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a82cc23 elementor-widget elementor-widget-heading\" data-id=\"a82cc23\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why Does HMRC Apply an OT Tax Code?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-77bae6e elementor-widget elementor-widget-text-editor\" data-id=\"77bae6e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>HMRC or an employer defaults to OT when there is a genuine information gap. That gap usually comes from one of three sources:<\/p><ol><li><strong>Missing starter documentation:<\/strong> No P45 from a previous employer and no completed starter checklist.<\/li><li><strong>Multiple income sources:<\/strong> The employee&#8217;s personal allowance is already allocated against another job or pension.<\/li><li><strong>A coding notice delay:<\/strong> <a href=\"https:\/\/befreeltd.com\/uk\/resources\/blogs\/hmrc-changing-tax-code\/\">HMRC<\/a> has not yet issued an updated code following a change in circumstances.<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-29cbad2 elementor-widget elementor-widget-text-editor\" data-id=\"29cbad2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>None of these causes are unusual. They happen constantly, across every payroll run, in every sector. That is precisely the problem.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6788abb elementor-widget elementor-widget-heading\" data-id=\"6788abb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why Is the OT Tax Code a Capacity Problem, Not an Accuracy Problem?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-91b5cb5 elementor-widget elementor-widget-text-editor\" data-id=\"91b5cb5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Most guidance on OT tax codes focuses on correcting the number: submit a starter checklist, chase the P45, wait for the updated coding notice. That advice is accurate and it works.<\/p><p>What it does not address is the volume. During busy onboarding periods, particularly at the start of a tax year, or when clients experience high staff turnover, an accountancy firm may be fielding dozens of OT-related queries at once. Each one is straightforward individually. Collectively, they consume disproportionate time on client communication, chasing documentation, and reassuring worried employees that a refund is coming.<\/p><p>This is where the real pressure sits. The technical fix for an OT tax code takes minutes. The administrative overhead of managing client expectations, tracking outstanding checklists, and explaining non-cumulative pay calculations to non-specialist clients is what actually strains firm resources, especially for practices already managing <a href=\"https:\/\/befreeltd.com\/uk\/services\/tax-outsourcing\/making-tax-digital\/\">Making Tax Digital<\/a> transition work, VAT filings and Self Assessment deadlines in parallel.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-53d8a96 elementor-widget elementor-widget-heading\" data-id=\"53d8a96\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How Should Firms Manage OT Tax Code Queries at Scale?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9db485b elementor-widget elementor-widget-text-editor\" data-id=\"9db485b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>A few practical adjustments reduce the drag without changing the technical process:<\/p><ul><li><strong>Standardise the starter checklist request:<\/strong> Build it into onboarding templates so it is requested automatically, not chased reactively.<\/li><li><strong>Set client expectations early:<\/strong> A short explanatory note at the point of hire, covering why OT might apply and that any overpayment is refundable, pre-empts a large share of follow-up queries.<\/li><li><strong>Batch coding notice reviews:<\/strong> Rather than actioning each HMRC notice as it lands, review them on a set schedule where payroll volume allows.<\/li><li><strong>Flag repeat offenders:<\/strong> Clients who consistently fail to collect starter information from new hires benefit from a direct conversation about process, not just a fixed payslip.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e37e278 elementor-widget elementor-widget-text-editor\" data-id=\"e37e278\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>None of this changes the underlying PAYE mechanics. It changes how much of a firm&#8217;s time the mechanics consume.<\/p><p>If your firm is managing a high volume of OT tax code queries alongside MTD, VAT and Self Assessment deadlines, Befree can help build the client-facing processes that keep payroll queries from consuming your team&#8217;s capacity. <a href=\"https:\/\/befreeltd.com\/uk\/contact-us\/\">Get in touch with our team<\/a> to find out more.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-051ad3a elementor-widget elementor-widget-heading\" data-id=\"051ad3a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">FAQs\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9457f67 elementor-widget elementor-widget-n-accordion\" data-id=\"9457f67\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;n_accordion_animation_duration&quot;:{&quot;unit&quot;:&quot;ms&quot;,&quot;size&quot;:300,&quot;sizes&quot;:[]},&quot;default_state&quot;:&quot;expanded&quot;,&quot;max_items_expended&quot;:&quot;one&quot;}\" data-widget_type=\"nested-accordion.default\">\n\t\t\t\t\t\t\t<div class=\"e-n-accordion\" aria-label=\"Accordion. Open links with Enter or Space, close with Escape, and navigate with Arrow Keys\">\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1550\" class=\"e-n-accordion-item\" open>\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"1\" tabindex=\"0\" aria-expanded=\"true\" aria-controls=\"e-n-accordion-item-1550\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> Is an OT tax code the same as an emergency tax code? <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1550\" class=\"elementor-element elementor-element-c67c6bb e-con-full e-flex e-con e-child\" data-id=\"c67c6bb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-05532e4 elementor-widget elementor-widget-text-editor\" data-id=\"05532e4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\tNot exactly. Emergency tax codes always carry a W1, M1 or X suffix and are, by definition, temporary and non-cumulative. An OT code can appear with or without these suffixes and, without one, is treated as cumulative and can remain in place indefinitely until corrected.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1551\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"2\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1551\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> Will an employee on an OT tax code get their money back? <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1551\" class=\"elementor-element elementor-element-5c3ee89 e-con-full e-flex e-con e-child\" data-id=\"5c3ee89\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2abb9b9 elementor-widget elementor-widget-text-editor\" data-id=\"2abb9b9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\tUsually, yes. Once the correct tax code is applied, HMRC typically adjusts future pay to refund any overpaid Income Tax through the payroll, or via a direct repayment where needed.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1552\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"3\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1552\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> What causes an OT W1 or OT M1 tax code specifically? <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1552\" class=\"elementor-element elementor-element-294fb64 e-con-full e-flex e-con e-child\" data-id=\"294fb64\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e15b8c5 elementor-widget elementor-widget-text-editor\" data-id=\"e15b8c5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\tThese apply when HMRC or the employer needs to pay tax on a non-cumulative, single-period basis, most often for a new starter mid-year where a P45 or starter checklist has not yet been received.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1553\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"4\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1553\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> Can self-employed clients be affected by an OT tax code? <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1553\" class=\"elementor-element elementor-element-55b945f e-con-full e-flex e-con e-child\" data-id=\"55b945f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1fc2845 elementor-widget elementor-widget-text-editor\" data-id=\"1fc2845\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>No. The OT tax code only applies within PAYE. Clients operating solely through Self Assessment, or under CIS as subcontractors, are not affected by it directly, though it is worth checking where a client has both employed and self-employed income.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<script type=\"application\/ld+json\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Is an OT tax code the same as an emergency tax code?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not exactly. Emergency tax codes always carry a W1, M1 or X suffix and are, by definition, temporary and non-cumulative. An OT code can appear with or without these suffixes and, without one, is treated as cumulative and can remain in place indefinitely until corrected.\"}},{\"@type\":\"Question\",\"name\":\"Will an employee on an OT tax code get their money back?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Usually, yes. Once the correct tax code is applied, HMRC typically adjusts future pay to refund any overpaid Income Tax through the payroll, or via a direct repayment where needed.\"}},{\"@type\":\"Question\",\"name\":\"What causes an OT W1 or OT M1 tax code specifically?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"These apply when HMRC or the employer needs to pay tax on a non-cumulative, single-period basis, most often for a new starter mid-year where a P45 or starter checklist has not yet been received.\"}},{\"@type\":\"Question\",\"name\":\"Can self-employed clients be affected by an OT tax code?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The OT tax code only applies within PAYE. Clients operating solely through Self Assessment, or under CIS as subcontractors, are not affected by it directly, though it is worth checking where a client has both employed and self-employed income.\"}}]}<\/script>\n\t\t\t\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>An OT tax code means an employee is being taxed on their full income with no personal allowance applied, usually because HMRC or the employer lacks the information needed to assign the correct code. For accountants, the code itself is simple to explain. What is harder to manage is the volume of client queries it [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":19818,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-19816","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>OT Tax Code: Meaning, Tax Rates &amp; How It Works<\/title>\n<meta name=\"description\" content=\"What does the OT tax code mean? 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