{"id":299,"date":"2025-07-17T06:00:00","date_gmt":"2025-07-17T06:00:00","guid":{"rendered":"https:\/\/tax2u.co.uk\/blog\/?p=299"},"modified":"2025-09-04T12:04:03","modified_gmt":"2025-09-04T12:04:03","slug":"how-to-register-for-self-assessment-in-the-uk","status":"publish","type":"post","link":"https:\/\/tax2u.co.uk\/blog\/2025\/07\/17\/how-to-register-for-self-assessment-in-the-uk\/","title":{"rendered":"How to register for Self Assessment in the UK"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">If you\u2019re self-employed, work under the CIS scheme, or earn extra income outside of PAYE \u2014 you need to register for <strong>Self Assessment<\/strong> with HMRC. But registering isn\u2019t always straightforward. Whether you\u2019re just getting started or missed the deadline last year, this guide will walk you through <strong>how to register for Self Assessment in 2025<\/strong>, what documents you need, and how to avoid delays with your <a href=\"https:\/\/www.tax2u.co.uk\/utr\/utr-number\" data-type=\"link\" data-id=\"https:\/\/www.tax2u.co.uk\/utr\/utr-number\"><strong>Unique Taxpayer Reference (UTR)<\/strong> number.<\/a><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"How To Register For Self Assessment - UK Tax\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/iZuuUshAbGo?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What Is Self Assessment?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Self Assessment is how HMRC collects Income Tax from people who don\u2019t have it automatically deducted from their wages (like employees do through PAYE).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You\u2019ll need to register if you:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Are <strong>self-employed<\/strong> or a <strong>sole trader<\/strong><\/li>\n\n\n\n<li>Work under the <strong>Construction Industry Scheme (CIS)<\/strong><\/li>\n\n\n\n<li>Earn money from <strong>property, crypto, dividends, or side gigs<\/strong><\/li>\n\n\n\n<li>Receive over <strong>\u00a31,000 in untaxed income<\/strong> during the tax year<br><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Once registered, you\u2019ll file a <strong>Self Assessment tax return<\/strong> every year.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>When to register for Self Assessment (Key Deadlines)<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you started working for yourself <strong>in the 2024\/25 tax year<\/strong> (6 April 2024 to 5 April 2025), you must register with HMRC <strong>by 5 October 2025<\/strong>.<\/p>\n\n\n\n<p class=\"is-style-plain wp-block-paragraph\"><strong>Deadline to register:<\/strong> 5 October<br><strong>Deadline to file your return:<\/strong> 31 January 2026<br><strong>Deadline to pay your tax:<\/strong> 31 January 2026<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Late registration<\/strong> can result in <strong>penalties<\/strong>, delays in getting your UTR, and missing out on refunds.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step-by-Step: How to Register for Self Assessment<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Step 1: Gather Your Details<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Before registering, make sure you have:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Full name and date of birth<\/li>\n\n\n\n<li>National Insurance (NI) number<\/li>\n\n\n\n<li>Address and contact info<\/li>\n\n\n\n<li>The date you started self-employment<\/li>\n\n\n\n<li>Your business type (sole trader, CIS worker, etc.)<br><br><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Step 2: Choose Your Registration Method<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">There are <strong>three main ways<\/strong> to register, depending on your situation:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Your Status<\/strong><\/th><th><strong>Registration Route<\/strong><\/th><\/tr><\/thead><tbody><tr><td>New sole trader<\/td><td>Register for Self Assessment online via HMRC<\/td><\/tr><tr><td>CIS subcontractor<\/td><td>Register as self-employed and for CIS at the same time<\/td><\/tr><tr><td>Previously registered but stopped<\/td><td>Re-register using form CWF1 or online login<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Step 3: Register Online via HMRC<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Visit: <a href=\"https:\/\/www.gov.uk\/register-for-self-assessment\">https:\/\/www.gov.uk\/register-for-self-assessment<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You\u2019ll need to:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Set up a <strong>Government Gateway account<\/strong><\/li>\n\n\n\n<li>Complete the online form (CWF1 for self-employment)<\/li>\n\n\n\n<li>Submit your application<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">After registering, HMRC will send your <strong>Unique Taxpayer Reference (UTR)<\/strong> by post within 10 working days (or 21 days if you\u2019re abroad).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What is a UTR number and why you need it<\/strong>?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Your <strong>UTR<\/strong> is a 10-digit number used by HMRC to identify you for Self Assessment. You\u2019ll need it to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Submit your tax return<\/li>\n\n\n\n<li>Join the Construction Industry Scheme (CIS)<\/li>\n\n\n\n<li>Get paid by contractors<\/li>\n\n\n\n<li>Claim tax refunds<br><br><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If you\u2019re registering late, apply now \u2014 <strong>UTR delays can prevent you from filing and claiming refunds.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Registering for Self Assessment as a CIS subcontractor<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you work in construction under the <strong>CIS scheme<\/strong>, you should:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Register as <strong>self-employed<\/strong> AND for <strong>CIS<\/strong> at the same time<\/li>\n\n\n\n<li>Provide contractor details if possible<\/li>\n\n\n\n<li>Expect a 20% tax deduction on your income (until you file)<br><\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">After filing your return, you may be owed a <strong>CIS tax refund<\/strong> \u2014 especially if you earned below the personal allowance threshold.<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Can I register for Self Assessment through Tax2u?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes, <strong>Tax2u makes registration quick, simple, and stress-free<\/strong>. We\u2019ve helped thousands of construction workers, sole traders, and side hustlers register with HMRC and claim their UTR.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With Tax2u, you get:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.tax2u.co.uk\/utr\/utr-number\" data-type=\"link\" data-id=\"https:\/\/www.tax2u.co.uk\/utr\/utr-number\">Online UTR application in 3 simple steps<\/a><\/li>\n\n\n\n<li>Free guidance from our UK-based tax team<\/li>\n\n\n\n<li>Automatic reminders and updates<\/li>\n\n\n\n<li>Full setup for Self Assessment and CIS if needed<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Start your Self Assessment registration <\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Don\u2019t risk missing the deadline or delaying your refund.<\/strong> Registering for Self Assessment only takes a few minutes and the earlier you do it, the smoother your tax year will be.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.tax2u.co.uk\/utr\/utr-number\" data-type=\"link\" data-id=\"https:\/\/www.tax2u.co.uk\/utr\/utr-number\">Apply for your UTR and register now with Tax2U<\/a><br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-default\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you\u2019re self-employed, work under the CIS scheme, or earn extra income outside of PAYE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":340,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,29],"tags":[259,243,244,256],"class_list":["post-299","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-self-assessment-income-tax","category-utr-registration","tag-register-with-hmrc","tag-self-assessment","tag-tax-return","tag-utr-number"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - 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