{"id":900,"date":"2026-01-15T06:00:00","date_gmt":"2026-01-15T06:00:00","guid":{"rendered":"https:\/\/tax2u.co.uk\/blog\/?p=900"},"modified":"2026-01-14T15:33:58","modified_gmt":"2026-01-14T15:33:58","slug":"self-assessment-31-january-deadline-what-can-still-be-amended-now","status":"publish","type":"post","link":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/15\/self-assessment-31-january-deadline-what-can-still-be-amended-now\/","title":{"rendered":"Self Assessment 31 January deadline: What can still be amended now"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">As the 31 January Self Assessment deadline approaches, a lot of people assume it\u2019s too late to fix anything. That\u2019s rarely true. Even in the final days before the deadline, there are still important changes you can make that reduce errors, avoid penalties, and put you in a stronger position with HMRC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here\u2019s what can still be amended now, what really matters at this stage, and where people often get caught out.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">First, what the 31 January deadline actually covers<\/h2>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The 31 January deadline is not just one thing. It usually covers:<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Filing your online Self Assessment tax return<\/li>\n\n\n\n<li>Paying any tax owed for the year<\/li>\n\n\n\n<li>Making your first payment on account, if applicable<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Missing it triggers automatic penalties, but <strong>being close to the deadline doesn\u2019t mean you\u2019ve lost control<\/strong>. The key is knowing what can still be corrected before you file.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Income figures can still be reviewed and corrected<\/h2>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Until you submit the return, your income figures are not locked in.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">You can still:<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Double-check self-employed income<\/li>\n\n\n\n<li>Add or correct CIS income and deductions<\/li>\n\n\n\n<li>Include side income, freelance work, or cash jobs<\/li>\n\n\n\n<li>Review online sales, commission, or one-off work<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">This is where many people rush and make mistakes. Over-declaring out of fear or under-declaring because something feels minor can both cause problems later.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you\u2019re unsure what counts, our blog <strong><a href=\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/01\/what-counts-as-income-for-self-assessment-and-what-doesnt\/\">What Counts as Income for Self Assessment (and What Doesn\u2019t)<\/a><\/strong> explains this clearly.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Expenses can still be adjusted<\/h2>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Expenses are another area that can still be amended right up until submission.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">You can:<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Remove expenses that don\u2019t qualify<\/li>\n\n\n\n<li>Add allowable expenses you missed<\/li>\n\n\n\n<li>Correct business-use percentages<\/li>\n\n\n\n<li>Review mileage, home office, or tool costs<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Getting expenses wrong is a common trigger for HMRC queries. It\u2019s better to file accurately than quickly.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Employment and PAYE details can still be checked<\/h2>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">If you\u2019ve had employment income alongside self-employment, you should still review:<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>P60 and P45 figures<\/li>\n\n\n\n<li>Tax deducted under PAYE<\/li>\n\n\n\n<li>Benefits in kind<\/li>\n\n\n\n<li>Employment start and end dates<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Even small PAYE mismatches can delay processing or lead to incorrect tax calculations.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">You can still file even if you can\u2019t pay<\/h2>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">One of the biggest misconceptions we see in January is this: people delay filing because they can\u2019t pay.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Here\u2019s the reality:<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Late filing triggers penalties automatically<\/strong><\/li>\n\n\n\n<li>Late payment usually results in interest, not immediate penalties<\/li>\n\n\n\n<li>Filing now stops the situation getting worse<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Our blog <strong><a href=\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/08\/late-self-assessment-filing-vs-late-payment-what-hmrc-penalises-and-what-it-doesnt\/\">Late Self Assessment Filing vs Late Payment: What HMRC Penalises (and What It Doesn\u2019t)<\/a><\/strong> explains why filing should always come first.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Payment options can still be explored<\/h2>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">If tax is due and payment is a concern, you can still:<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check if a Time to Pay arrangement may apply<\/li>\n\n\n\n<li>Plan partial payments<\/li>\n\n\n\n<li>Understand what HMRC expects next<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Even if you don\u2019t set up payment immediately, filing on time keeps options open and reduces pressure.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div style=\"height:0px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What cannot be amended after filing (without extra steps)<\/h2>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Once you submit your return:<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Penalties for late filing cannot be avoided<\/li>\n\n\n\n<li>Changes require an amendment process<\/li>\n\n\n\n<li>HMRC scrutiny may increase if figures change significantly<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">That\u2019s why the final review before submission matters, even when time is tight.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What if you\u2019ve already missed the deadline?<\/h2>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">If you\u2019re reading this after 31 January, the advice changes slightly, but action still matters.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">You may want to read:<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/05\/self-assessment-not-filed-yet-what-to-do-now-to-avoid-hmrc-penalties\/\">Self-Assessment Not Filed Yet? What to Do Now to Avoid HMRC Penalties<\/a><\/strong><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/tax2u.co.uk\/blog\/2025\/12\/29\/what-happens-if-you-miss-the-self-assessment-deadline\/\">What Happens If You Miss the Self Assessment Deadline?<\/a><\/strong><\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Filing late is never ideal, but delaying further only increases costs.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">A quick last-minute checklist<\/h2>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Before you submit, ask yourself:<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Have all income sources been included?<\/li>\n\n\n\n<li>Are CIS deductions entered correctly?<\/li>\n\n\n\n<li>Are expenses reasonable and supportable?<\/li>\n\n\n\n<li>Are PAYE figures accurate?<\/li>\n\n\n\n<li>Have you reviewed the final tax calculation?<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">If the answer to any of these is \u201cI\u2019m not sure\u201d, it\u2019s worth pausing rather than rushing.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Final thought: accuracy beats speed, even in January<\/h2>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The 31 January deadline creates pressure, but mistakes made in a rush can cause long-term issues. The return you submit now sets the tone for penalties, payments, and HMRC correspondence later.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Whether you need a final sense-check or full filing support, acting now gives you the best outcome.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you\u2019re still making changes, you\u2019re not too late. You just need to make the right ones.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.tax2u.co.uk\/tax-return\/self-assessment\"><strong>Tax2u helps clients review and file Self Assessment returns correctly, even close to the deadline.<\/strong> <\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>As the 31 January Self Assessment deadline approaches, a lot of people assume it\u2019s too&#8230;<\/p>\n","protected":false},"author":2,"featured_media":901,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[245,247,243,244],"class_list":["post-900","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-self-assessment-income-tax","tag-hmrc-deadlines","tag-income","tag-self-assessment","tag-tax-return"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - 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