{"id":1398,"date":"2025-11-13T14:34:35","date_gmt":"2025-11-13T14:34:35","guid":{"rendered":"https:\/\/www.simplybusiness.co.uk\/\/knowledge\/business-tax\/hmrc-errors-and-mistakes-guidance\/"},"modified":"2025-11-13T14:34:37","modified_gmt":"2025-11-13T14:34:37","slug":"hmrc-errors-and-mistakes-guidance","status":"publish","type":"knowledge","link":"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-errors-and-mistakes-guidance\/","title":{"rendered":"How to amend a Self Assessment tax return"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">If you\u2019ve made an error or mistake, you\u2019ll want to know how to amend a tax return. Thankfully, it\u2019s possible to make changes even after you\u2019ve submitted your Self Assessment. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here\u2019s the HMRC errors and mistakes guidance that self-employed people should know.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\"><a href=\"#amend\">Can you amend a tax return?<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"#how\">How to amend a tax return<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"#far\">How far back can you amend a tax return?<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"#deadline\">What if I\u2019ve missed the deadline for amending a tax return?<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"#mistake\">What happens if you make a mistake on your tax return? <\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"#hmrc\">HMRC errors and mistakes that aren\u2019t your fault<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"#underpaid\">What if I need to pay more tax?<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"#personal\">Updating personal information<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"amend\">Can you amend a tax return?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">You can amend a tax return if you&#8217;ve made a mistake while filing. You\u2019ll need to wait 72 hours after filing before making a change \u2013 and you&#8217;ll only be able to correct a tax return within 12 months of the submission deadline.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By amending your tax return before HMRC spots the mistake, you could reduce the chances of receiving a penalty fee.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your amended tax return will then lead to an amended bill, which will show whether you owe tax or are due a refund. This is usually available within three days and will show if you owe any penalty fees.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you\u2019re owed a refund, you can click \u2018request payment\u2019 on your HMRC account. The money is usually paid within four weeks.<\/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 fill in a Self Assessment tax return UK\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/53kodFNm-Mc?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<h2 class=\"wp-block-heading\" id=\"how\">How to amend a tax return<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The method for amending a tax return depends on whether you filed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\"><a href=\"#online\">online<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"#app\">using the HMRC app<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"#paper\">on paper<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"#third\">using third-party software<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"online\">How to amend a tax return online in 7 steps<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Most people now <a data-type=\"knowledge\" data-id=\"1514\" href=\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/self-employed-tax-changes\/\">submit their tax return<\/a> digitally \u2013 especially since the introduction of <a href=\"https:\/\/www.simplybusiness.co.uk\/knowledge\/self-assessment\/making-tax-digital-for-income-tax\/\" data-type=\"knowledge\" data-id=\"38240\" >Making Tax Digital<\/a>. If you filed online, you can make an amendment by following these seven steps:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li class=\"wp-block-list-item\">Sign into your account using your Government Gateway user ID and password<\/li>\n\n\n\n<li class=\"wp-block-list-item\">From \u2018Your tax account\u2019, choose \u2018Self Assessment tax account\u2019 (ignore this step if you don\u2019t see this option)<\/li>\n\n\n\n<li class=\"wp-block-list-item\">Select \u2018More Self Assessment details\u2019<\/li>\n\n\n\n<li class=\"wp-block-list-item\">Select \u2018At a glance\u2019<\/li>\n\n\n\n<li class=\"wp-block-list-item\">Select \u2018tax return options\u2019<\/li>\n\n\n\n<li class=\"wp-block-list-item\">Choose the tax year for the return you\u2019re updating<\/li>\n\n\n\n<li class=\"wp-block-list-item\">Make your corrections in the return, and file it again<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"app\">How to amend a tax return on the HMRC app<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">You can also amend your tax return using the HMRC app. If you\u2019re using the app for the first time, you\u2019ll need to sign in using your Government Gateway user ID. After this point, you\u2019ll be able to sign in using:<\/p>\n\n\n\n<div id=\"nba-body-001\">\n<\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\">your phone\u2019s fingerprint or facial recognition software<\/li>\n\n\n\n<li class=\"wp-block-list-item\">a 6-digit PIN number<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Once you sign in to the app, there\u2019s a section titled \u2018Self Assessment\u2019 which is where you\u2019ll find any previous or upcoming payments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"paper\">How to amend a paper tax return<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you filed your return on paper, you\u2019ll need to <a href=\"https:\/\/www.gov.uk\/self-assessment-forms-and-helpsheets\" rel=\"noopener noreferrer\" target=\"_blank\">download a new tax return<\/a> and send HMRC the pages that need correcting.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Write \u2018amendment\u2019 on each corrected page, and make sure that you include both your name and your <a href=\"\/knowledge\/business-tax\/what-is-a-utr-number\/\" data-type=\"knowledge\" data-id=\"1195\">Unique Taxpayer Reference<\/a> (you can find your UTR on previous correspondence from HMRC). Send it to HMRC at the address found on your Self Assessment paperwork.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But as Making Tax Digital becomes mandatory, you&#8217;ll be more likely to submit an online Self Assessment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"third\">How to amend a tax return if you used third-party software<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you used third-party software to file your return, you should contact the software provider for help on what to do. If you can&#8217;t make changes using your chosen software, <a href=\"https:\/\/www.gov.uk\/government\/organisations\/hm-revenue-customs\/contact\/self-assessment\" rel=\"noopener noreferrer\" target=\"_blank\">contact HMRC directly<\/a>.<\/p>\n\n\n\n<div class=\"wp-block-group has-azure-200-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-30c80bf8 wp-block-group-is-layout-constrained\" style=\"border-radius:35px;margin-top:var(--wp--preset--spacing--90);margin-bottom:var(--wp--preset--spacing--90);padding-top:var(--wp--preset--spacing--90);padding-right:var(--wp--preset--spacing--90);padding-bottom:var(--wp--preset--spacing--90);padding-left:var(--wp--preset--spacing--90)\">\n<h3 class=\"wp-block-heading\" id=\"h-3-common-tax-return-mistakes\">3 common tax return mistakes<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Filing a tax return is tricky and there\u2019s lots of information to include. As a result, mistakes can be common.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here are some of the things that often lead to taxpayers needing to amend their Self Assessment:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li class=\"wp-block-list-item\"><strong>Left out taxable income<\/strong> \u2013 you may have various sources of income and forgotten to include one<\/li>\n\n\n\n<li class=\"wp-block-list-item\"><strong>Incorrect personal details<\/strong> \u2013 you may have moved home and used your old address<\/li>\n\n\n\n<li class=\"wp-block-list-item\"><strong>Misspelling<\/strong> \u2013 you may have misspelt a name. It\u2019s important that all key information is correct<\/li>\n<\/ol>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"far\">How far back can you amend a tax return?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The deadline for amending a tax return is within 12 months of the normal 31 January <a data-type=\"knowledge\" data-id=\"1509\" href=\"https:\/\/www.simplybusiness.co.uk\/knowledge\/self-assessment\/self-assessment-deadline\/\">Self Assessment deadline<\/a>.<\/p>\n\n\n\n<div class=\"wp-block-group has-azure-300-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-75945e8f wp-block-group-is-layout-constrained\" style=\"border-radius:10px;padding-top:var(--wp--preset--spacing--50);padding-right:var(--wp--preset--spacing--90);padding-bottom:var(--wp--preset--spacing--50);padding-left:var(--wp--preset--spacing--90)\">\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\">for the 2023-24 tax year, you\u2019ll need to make any changes by 31 January 2026<\/li>\n\n\n\n<li class=\"wp-block-list-item\">for the 2024-25 tax year, you\u2019ll need to make any changes by 31 January 2027<\/li>\n<\/ul>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">If you miss the deadline, you may still be able to make the changes \u2013 but you\u2019ll have to write to HMRC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It\u2019s possible to claim a tax refund up to four years after the end of the relevant tax year. You\u2019ll need to write to HMRC, saying that you\u2019re making a claim for overpayment relief. However, it\u2019s important to note that HMRC has the right to reject claims after the initial 12-month deadline.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"deadline\">What if I\u2019ve missed the deadline for amending a tax return?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If you want to amend your Self Assessment but have missed the relevant deadline, you need to write to HMRC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When writing to HMRC, make sure you include the following details:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\">the tax year for which you want to make a correction<\/li>\n\n\n\n<li class=\"wp-block-list-item\">the reason why you think you\u2019ve paid an incorrect amount of tax<\/li>\n\n\n\n<li class=\"wp-block-list-item\">the amount you think you&#8217;ve either over or underpaid<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If you\u2019re claiming a tax refund, you need to say that you\u2019re claiming \u2018overpayment relief\u2019 and include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\">the tax year for which you think you overpaid<\/li>\n\n\n\n<li class=\"wp-block-list-item\">the amount you think you\u2019ve overpaid<\/li>\n\n\n\n<li class=\"wp-block-list-item\">why you think overpayment has happened<\/li>\n\n\n\n<li class=\"wp-block-list-item\">that you\u2019ve not tried to claim this refund before <\/li>\n\n\n\n<li class=\"wp-block-list-item\">a signed declaration that the information you\u2019ve given is \u201ccorrect and complete to the best of your knowledge\u201d<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">You may need to give documentary proof of tax deducted, so be sure to have this ready.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your claim is successful, you\u2019ll get a refund to your bank account within four weeks.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"mistake\">What happens if you make a mistake on your tax return?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">By following the steps in this article, you should be able to fix any mistakes in your tax return. The important thing is to do this in the allotted time and be up front about what happened.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Failing to amend an incorrect tax return could result in fines or even an <a href=\"\/knowledge\/business-tax\/hmrc-tax-investigation\/\" data-type=\"knowledge\" data-id=\"1402\">investigation from HMRC<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"hmrc\">HMRC errors and mistakes that aren\u2019t your fault<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Of course, HMRC can make mistakes too, whether these involve computer problems or human error. This makes it important to check your tax calculations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It\u2019s also important to keep <a href=\"\/knowledge\/business-tax\/how-long-to-keep-tax-records\/\" data-type=\"knowledge\" data-id=\"1407\">accurate tax records<\/a>, so that you can prove the mistake isn\u2019t on your end.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If for example HMRC is investigating you for tax underpayment but you\u2019re sure you\u2019ve paid correctly, your tax returns, receipts, <a href=\"\/knowledge\/cash-flow\/how-to-write-an-invoice\/\" data-type=\"knowledge\" data-id=\"1461\">invoices<\/a>, and bank statements will be needed as evidence.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You can ask the tax authority to <a href=\"https:\/\/www.gov.uk\/hmrc-did-not-act\" rel=\"noopener noreferrer\" target=\"_blank\">cancel the tax you owe<\/a> if there was a <strong>delay in them asking you for information<\/strong> or they <strong>didn\u2019t act on information they had<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"reasonable\">What does \u2018reasonable care\u2019 mean when amending a tax return?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">You won\u2019t have to pay a penalty if you\u2019ve taken \u2018reasonable care\u2019 to fill out your tax return correctly. However, <a href=\"\/knowledge\/self-assessment\/hmrc-penalties-for-self-assessment\/\" data-type=\"knowledge\" data-id=\"1399\">HMRC can issue penalties<\/a> if you\u2019ve understated tax or misrepresented your tax liability because you\u2019ve been careless.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here\u2019s how the government calculates penalties:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\">if a penalty arises because of a lack of reasonable care, the penalty will be between 0 and 30 per cent of the extra tax due<\/li>\n\n\n\n<li class=\"wp-block-list-item\">if the error is deliberate, the penalty will be between 20 and 70 per cent of the extra tax due<\/li>\n\n\n\n<li class=\"wp-block-list-item\">if the error is deliberate and concealed, the penalty will be between 30 and 100 per cent of the extra tax due<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Make sure you keep on top of <a href=\"\/knowledge\/business-tax\/what-is-bookkeeping\/\" data-type=\"knowledge\" data-id=\"1259\">bookkeeping for your business<\/a> or hire an accountant if you\u2019re not sure of anything.<\/p>\n\n\n\n<div class=\"wp-block-group has-azure-200-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-30c80bf8 wp-block-group-is-layout-constrained\" style=\"border-radius:35px;margin-top:var(--wp--preset--spacing--90);margin-bottom:var(--wp--preset--spacing--90);padding-top:var(--wp--preset--spacing--90);padding-right:var(--wp--preset--spacing--90);padding-bottom:var(--wp--preset--spacing--90);padding-left:var(--wp--preset--spacing--90)\">\n<h2 class=\"wp-block-heading\" id=\"underpaid\"><strong>Underpaid tax \u2013 what if I need to pay more?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">HMRC may say you\u2019ve underpaid tax or you may have underpaid after making changes to your tax return. If you\u2019ve made your changes online, you should be able to see the new amount of tax you owe on your Self Assessment tax account within three days.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You\u2019ll also see a deadline for paying the remaining tax. Remember that you may be charged interest.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your new tax bill may also affect any <a href=\"\/knowledge\/self-assessment\/self-assessment-payment-on-account\/\" data-type=\"knowledge\" data-id=\"1510\">payments on account<\/a> you need to pay.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"personal\">Updating personal information<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">It\u2019s important to tell HMRC about <a href=\"https:\/\/www.gov.uk\/tell-hmrc-change-of-details\" rel=\"noopener noreferrer\" target=\"_blank\">changes to your personal details for Self Assessment<\/a> as soon as you can.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you\u2019ve failed to do this and you need to change the address for your tax return after filing it, make sure you make any corrections following the process above (up to a year after the filing deadline).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You can update your address online if you\u2019ve set up a <a href=\"\/knowledge\/business-tax\/personal-tax-account\/\" data-type=\"knowledge\" data-id=\"1495\">personal tax account<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">More tax information for small business owners<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\"><a href=\"https:\/\/www.simplybusiness.co.uk\/knowledge\/self-assessment\/self-employed-expenses\/\" data-type=\"knowledge\" data-id=\"1511\">Self-employed expenses \u2013 what expenses are tax deductible?<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-refund\/\" data-type=\"knowledge\" data-id=\"1423\">Self-employed tax refund: how to get one if you\u2019ve overpaid tax<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"\/knowledge\/self-assessment\/hmrc-time-to-pay\/\" data-type=\"knowledge\" data-id=\"1403\">What is HMRC Time to Pay? Pay your tax bill in instalments<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/can-hmrc-check-personal-bank-accounts\/\" data-type=\"knowledge\" data-id=\"926\">Can HMRC check your bank account without your permission?<\/a><\/li>\n<\/ul>\n\n\n\n<div id=\"nba-upsell-001\" class=\"wp-block-group has-azure-200-background-color has-background has-global-padding is-layout-constrained wp-container-core-group-is-layout-94e519ba wp-block-group-is-layout-constrained\" style=\"padding-top:var(--wp--preset--spacing--80);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--80);padding-left:var(--wp--preset--spacing--40)\">\n<h3 class=\"wp-block-heading has-text-align-center\" id=\"lookingforselfemployedinsurance\">Looking for self-employed insurance?<\/h3>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">With Simply Business you can build a single <a href=\"\/business-insurance\/self-employed-insurance\/\">self employed insurance<\/a> policy combining the covers that are relevant to you. Whether it&#8217;s <a href=\"\/business-insurance\/public-liability-insurance\/\">public liability insurance<\/a>, <a href=\"\/business-insurance\/professional-indemnity-insurance\/\">professional indemnity<\/a> or whatever else you need, we&#8217;ll run you a quick quote online, and let you decide if we&#8217;re a good fit.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-a89b3969 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/quote.simplybusiness.co.uk\/business\">Start your quote<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Photograph:<\/em> <em>Wayhome Studio\/stock.adobe.com<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div id=\"nba-body-end\">\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>If you\u2019ve made errors on your Self Assessment, here\u2019s how to make a change.<\/p>\n","protected":false},"author":3,"featured_media":2849,"comment_status":"open","ping_status":"closed","template":"","meta":{"sb_hreflang":"","sb_hreflang_url":"","disable_breadcrumbs":false,"sb_breadcrumbs":[],"sb_reviewed_by":"","sb_review_date":"","sb_enable_content_gating":true,"footnotes":""},"categories":[344,348],"hidden-category":[],"coauthors":[26],"class_list":["post-1398","knowledge","type-knowledge","status-publish","has-post-thumbnail","hentry","category-business-tax","category-self-assessment"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Amend a Self Assessment: HMRC errors and mistakes guidance<\/title>\n<meta name=\"description\" content=\"Wondering how to amend a Self Assessment? 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