{"id":1103,"date":"2025-11-20T07:26:59","date_gmt":"2025-11-20T07:26:59","guid":{"rendered":"https:\/\/www.bsassociate.co.uk\/blog\/?p=1103"},"modified":"2025-11-20T07:26:59","modified_gmt":"2025-11-20T07:26:59","slug":"self-assessment-2024-25-hmrc-key-dates-london","status":"publish","type":"post","link":"https:\/\/www.bsassociate.co.uk\/blog\/self-assessment-2024-25-hmrc-key-dates-london\/","title":{"rendered":"2024\u201325 Self-Assessment: HMRC Changes, Key Dates, and What UK Taxpayers Should Know"},"content":{"rendered":"\n<p>For UK taxpayers, the Self-Assessment season can feel overwhelming especially when the rules change or deadlines approach quickly. This guide breaks everything down clearly, with step-by-step guidance to help you confidently file your <a href=\"https:\/\/www.gov.uk\/log-in-file-self-assessment-tax-return\">2024\u201325 Self-Assessment tax return online<\/a> before the deadline of <em>31 January 2026<\/em>.<\/p>\n\n\n\n<p>Whether you are self-employed, a landlord, earning through a side hustle, or simply have additional income, this guide is designed to help you file correctly, avoid penalties, and understand exactly what HMRC expects for the 2024\u201325 tax year.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\"><strong>Understanding the 2024\u201325 Self-Assessment Requirements<\/strong><\/h2>\n\n\n\n<p>The <strong>Self-Assessment system<\/strong> is how HMRC collects income tax from people whose earnings are not fully taxed through PAYE. Londoners with diverse income sources of freelancing, rental property, contracting, gig economy, or investments often fall into this category.<\/p>\n\n\n\n<p>This guide provides:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clear Filing Deadlines<\/li>\n\n\n\n<li>How To Register with HMRC<\/li>\n\n\n\n<li>Documents To Prepare<\/li>\n\n\n\n<li>How To Submit Your Return Online<\/li>\n\n\n\n<li>Penalties To Avoid<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Key HMRC Deadlines for the 2024\u201325 Self-Assessment<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Important dates you must know<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Requirement<\/strong><\/td><td><strong>Deadline<\/strong><\/td><td><strong>Notes<\/strong><\/td><\/tr><tr><td><strong>Tax year covered<\/strong><\/td><td>6 April 2024 \u2013 5 April 2025<\/td><td>All income and expenses relate to this period.<\/td><\/tr><tr><td><strong>Register for Self Assessment (new taxpayers)<\/strong><\/td><td><strong>5 October 2025<\/strong><\/td><td>You must register in time to receive your UTR and set up your HMRC online account.<\/td><\/tr><tr><td><strong>Paper tax returns deadline<\/strong><\/td><td>31 October 2025<\/td><td>Only for those filing via post.<\/td><\/tr><tr><td><strong>Online tax return filing deadline<\/strong><\/td><td><strong>31 January 2026<\/strong><\/td><td>Final date to <strong>file your 2024\u201325 return<\/strong> and <strong>pay your tax bill<\/strong>.<\/td><\/tr><tr><td><strong>Payments on account (if applicable)<\/strong><\/td><td>31 January &amp; 31 July<\/td><td>Applies to many self-employed taxpayers.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Most important:<\/strong><br>&nbsp;<strong>31 January 2026<\/strong> is the final date to file your online <a href=\"https:\/\/www.bsassociate.co.uk\/self-assessment-tax-return-accountants-london.php\">Self-Assessment tax return<\/a> and pay any tax due for 2024\u201325.<\/p>\n\n\n\n<p>Filing early gives you time to budget, correct mistakes, and avoid last-minute HMRC portal delays.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Who Must File a 2024\u201325 Self-Assessment Tax Return?<\/strong><\/h2>\n\n\n\n<p>You will likely need to file if any of the following apply to the 2024\u201325 tax year:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You were <strong>self-employed<\/strong> and earned <strong>over \u00a31,000<\/strong> (before expenses).<\/li>\n\n\n\n<li>You were a <strong>partner<\/strong> in a business partnership.<\/li>\n\n\n\n<li>You earned <strong>rental income<\/strong> from property.<\/li>\n\n\n\n<li>You received <strong>dividends, interest, or investment income<\/strong> not fully taxed.<\/li>\n\n\n\n<li>You earned money from <strong>gig economy platforms<\/strong> or side jobs.<\/li>\n\n\n\n<li>You had <strong>capital gains<\/strong> (e.g., sale of property, shares, crypto).<\/li>\n\n\n\n<li>Your income was over <strong>\u00a350,000<\/strong> and you or your partner received <strong>Child Benefit<\/strong>.<\/li>\n\n\n\n<li>HMRC sent you a notice to file.<\/li>\n<\/ul>\n\n\n\n<p>If you\u2019re unsure, you can use the HMRC \u201c<a href=\"https:\/\/www.gov.uk\/check-if-you-need-tax-return\">Check if you need to do a Self Assessment<\/a>\u201d tool.<\/p>\n\n\n\n<p><strong>Side hustles under \u00a31,000:<\/strong><br>&nbsp;If your total income from small gigs is <strong>\u00a31,000 or less<\/strong>, the trading allowance may mean you <strong>don\u2019t<\/strong> need to file but there are exceptions. If you earn above this, you must register.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How to Register for Self Assessment ?(If You\u2019re New)<\/strong><\/h2>\n\n\n\n<p>If you did not file a tax return last year, you must <a href=\"https:\/\/www.bsassociate.co.uk\/blog\/register-for-self-assessment-by-5-october-2025-avoid-hmrc-penalties\/\"><strong>register with HMRC by 5 October 2025<\/strong>.<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Registration steps (simple and clear):<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Create or log into your Government Gateway account<\/strong>.<\/li>\n\n\n\n<li><strong>Register for Self-Assessment<\/strong> online through your HMRC account.<\/li>\n\n\n\n<li>HMRC will send your <strong>Unique Taxpayer Reference (UTR)<\/strong> by post.<\/li>\n\n\n\n<li>Use the UTR to activate your Self Assessment online services.<\/li>\n\n\n\n<li>You can then start completing your 2024\u201325 tax return.<\/li>\n<\/ol>\n\n\n\n<p><strong>Tip:<\/strong> Register early UTR letters can take time, especially during peak HMRC periods.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What You Need Before You Start Filing?<\/strong><\/h2>\n\n\n\n<p>Prepare these to avoid mistakes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your <strong>Unique Taxpayer Reference (UTR)<\/strong><\/li>\n\n\n\n<li>Your <strong>National Insurance number<\/strong><\/li>\n\n\n\n<li>Income records:<ul><li>Self-employment invoices &amp; expenses<\/li><\/ul><ul><li>PAYE (P60, P45)<\/li><\/ul><ul><li>Pension contributions<\/li><\/ul><ul><li>Rental income &amp; expense receipts<\/li><\/ul>\n<ul class=\"wp-block-list\">\n<li>Bank interest and dividend statements<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Proof of benefits or allowances<\/li>\n\n\n\n<li>Business records if self-employed (bank statements, receipts, mileage logs)<\/li>\n<\/ul>\n\n\n\n<p>Keeping clear records reduces errors and supports accuracy if HMRC requests evidence.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How to Submit Your 2024\u201325 Tax Return Online?<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step-by-step filing overview<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>1. Log in to HMRC<\/strong><\/h4>\n\n\n\n<p>Sign into your HMRC account using your Government Gateway ID.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>2. Select the tax year (2024\u201325)<\/strong><\/h4>\n\n\n\n<p>You can start filing after 6 April 2025.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>3. Add relevant income sections<\/strong><\/h4>\n\n\n\n<p>HMRC will guide you to complete the right forms:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SA100 (main return)<\/li>\n\n\n\n<li>SA103 (self-employment)<\/li>\n\n\n\n<li>SA105 (property income)<\/li>\n\n\n\n<li>SA108 (capital gains)<\/li>\n\n\n\n<li>And others depending on your income sources<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>4. Add allowable expenses<\/strong><\/h4>\n\n\n\n<p>This lowers your tax liability, but only genuine, fully supported expenses should be claimed.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>5. Review the tax calculation<\/strong><\/h4>\n\n\n\n<p>HMRC automatically estimates your tax bill before submission.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>6. Submit your return<\/strong><\/h4>\n\n\n\n<p>Make sure HMRC <strong>receives<\/strong> it before <strong>31 January 2026<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Paying Your Tax Bill: What Londoners Should Know<\/strong><\/h2>\n\n\n\n<p>Once your return is submitted, HMRC calculates how much you owe.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Your payment may include:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Balancing payment<\/strong> (for 2024\u201325 tax year)<\/li>\n\n\n\n<li><strong>First payment on account<\/strong> for 2025\u201326 (if applicable)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Payment methods include:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Online banking<\/li>\n\n\n\n<li>Debit card<\/li>\n\n\n\n<li>Direct Debit<\/li>\n\n\n\n<li>CHAPS \/ BACS<\/li>\n\n\n\n<li>Bank transfer<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>If you can\u2019t pay<\/strong><\/h3>\n\n\n\n<p>You may be eligible for a <strong>Time to Pay<\/strong> arrangement, allowing you to pay in installments. You must <strong>submit your tax return first<\/strong> before HMRC sets up a plan.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Penalties and Interest<\/strong><\/h2>\n\n\n\n<p>Avoid these costly penalties:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Issue<\/strong><\/td><td><strong>Penalty<\/strong><\/td><\/tr><tr><td><strong>Late filing (up to 3 months late)<\/strong><\/td><td>\u00a3100 automatic fine<\/td><\/tr><tr><td><strong>After 3 months<\/strong><\/td><td>Daily penalties may apply<\/td><\/tr><tr><td><strong>After 6 months<\/strong><\/td><td>Additional penalties based on tax owed<\/td><\/tr><tr><td><strong>Late payment<\/strong><\/td><td>Interest charged daily<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Always file even if you can\u2019t pay<\/strong> \u2014 filing stops further penalties from accumulating.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Common Mistakes Londoners Can Avoid<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Leaving filing until the final week (risking HMRC system delays).<\/li>\n\n\n\n<li>Forgetting to register by <strong>5 October 2025<\/strong> if new to Self Assessment.<\/li>\n\n\n\n<li>Missing deductible expenses due to poor record keeping.<\/li>\n\n\n\n<li>Forgetting earlier payments on account.<\/li>\n\n\n\n<li>Typing errors in income or expense figures.<\/li>\n\n\n\n<li>Not updating address or contact details with HMRC.<\/li>\n<\/ul>\n\n\n\n<p>The earlier you start, the fewer issues you will face.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>A Helpful Note About Professional Support<\/strong><strong><\/strong><\/h2>\n\n\n\n<p>If you\u2019re seeking reliable, clear guidance to ensure accurate filing whether you\u2019re self-employed, a landlord, or earning from multiple sources <a href=\"https:\/\/www.bsassociate.co.uk\/\"><strong>Brayan &amp; Spencer Associates<\/strong><\/a> provide practical Self-Assessment support tailored to London taxpayers.<\/p>\n\n\n\n<p>They help ensure:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Correct registration<\/li>\n\n\n\n<li>Accurate completion of all income sections<\/li>\n\n\n\n<li>Proper claim of allowable expenses<\/li>\n\n\n\n<li>Timely submission of your return<\/li>\n\n\n\n<li>Guidance on payments on account<\/li>\n<\/ul>\n\n\n\n<p>If you need help understanding your Self-Assessment requirements or want your return reviewed before submission, you can <strong>visit <\/strong><a href=\"http:\/\/www.bsassociate.co.uk\/\"><strong>www.bsassociate.co.uk<\/strong><\/a> or <strong>call 0207 183 5956<\/strong> for straightforward, helpful advice.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>FAQs<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. When is the deadline for the 2024\u201325 Self-Assessment tax return?<\/strong><\/h3>\n\n\n\n<p>The deadline to file online and pay any tax owed is <strong>31 January 2026<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. When must I register for Self Assessment if I\u2019m new?<\/strong><\/h3>\n\n\n\n<p>You must <a href=\"https:\/\/www.bsassociate.co.uk\/blog\/register-for-self-assessment-by-5-october-2025-avoid-hmrc-penalties\/\">register with HMRC by <strong>5 October 2025<\/strong><\/a> if you had untaxed income in 2024\u201325.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Do I need to file if I made less than \u00a31,000 from a side hustle?<\/strong><\/h3>\n\n\n\n<p>If your income is <strong>\u00a31,000 or below<\/strong>, you may not need to file due to the trading allowance but check HMRC\u2019s \u201cDo I need to file?\u201d tool as exceptions exist.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. What documents do I need?<\/strong><\/h3>\n\n\n\n<p>You\u2019ll need your UTR, NI number, income records (P60\/P45), receipts, bank statements, rental and dividend statements, and any other untaxed income evidence.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5. What happens if I miss the 31 January 2026 deadline?<\/strong><\/h3>\n\n\n\n<p>You\u2019ll receive a <strong>\u00a3100 automatic penalty<\/strong>, and additional penalties apply the longer you delay. File as soon as possible to prevent further charges.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>6. Can I pay my tax bill in instalments?<\/strong><\/h3>\n\n\n\n<p>Yes. If you\u2019ve filed your return, HMRC may allow a <strong>Time to Pay<\/strong> arrangement based on your financial circumstances.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>For UK taxpayers, the Self-Assessment season can feel overwhelming especially when the rules change or deadlines approach quickly. This guide breaks everything down clearly, with step-by-step guidance to help you confidently file your 2024\u201325 Self-Assessment tax return online before the deadline of 31 January 2026. Whether you are self-employed, a landlord, earning through a side [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1104,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[33],"tags":[34],"class_list":["post-1103","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-self-assessment-tax-return","tag-self-assessment-tax-return"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>2024\u201325 Self-Assessment: HMRC Changes, Key Dates, and What UK Taxpayers Should Know - BS Associates Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bsassociate.co.uk\/blog\/self-assessment-2024-25-hmrc-key-dates-london\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2024\u201325 Self-Assessment: HMRC Changes, Key Dates, and What UK Taxpayers Should Know - BS Associates Blog\" \/>\n<meta property=\"og:description\" content=\"For UK taxpayers, the Self-Assessment season can feel overwhelming especially when the rules change or deadlines approach quickly. 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