{"id":906,"date":"2026-01-22T06:00:00","date_gmt":"2026-01-22T06:00:00","guid":{"rendered":"https:\/\/tax2u.co.uk\/blog\/?p=906"},"modified":"2026-01-21T14:14:25","modified_gmt":"2026-01-21T14:14:25","slug":"why-your-self-assessment-tax-bill-is-higher-than-expected-in-january","status":"publish","type":"post","link":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/","title":{"rendered":"Why your Self Assessment tax bill is higher than expected in January"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Opening your HMRC account in January and seeing a bigger tax bill than expected is a shock many people don\u2019t see coming. You might feel confident you put money aside. You may even have filed before. Yet the figure still looks wrong.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here\u2019s the thing. In most cases, the bill is higher for very specific reasons. Once you understand them, the number makes a lot more sense and, just as importantly, you can plan better next time.<\/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\">1. Payments on account catch people out<\/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\">This is the biggest reason January bills feel inflated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your Self Assessment tax bill is over \u00a31,000 and less than 80% of your tax is collected through PAYE, HMRC usually asks for <strong>Payments on Account<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That means:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your January bill includes the <strong>balance for the last tax year<\/strong><\/li>\n\n\n\n<li>Plus <strong>50% of the estimated tax for the current tax year<\/strong><\/li>\n\n\n\n<li>And another 50% is due the following July<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">So you\u2019re not just paying for what\u2019s already happened. You\u2019re prepaying future tax as well.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This often leads people to think they\u2019ve been overcharged, when in reality HMRC is spreading payments forward.<\/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\">2. You may not have set aside enough during the year<\/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\">Many self-employed people, contractors, and landlords save roughly 20%-25% of income. That can work at lower income levels, but it quickly falls short when profits rise.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common reasons include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Moving into a higher tax band<\/li>\n\n\n\n<li>Underestimating National Insurance<\/li>\n\n\n\n<li>Forgetting student loan repayments<\/li>\n\n\n\n<li>Not accounting for Payments on Account<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The result is a January bill that feels sudden, even though the tax liability built up gradually over the year.<\/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\">3. CIS deductions don\u2019t always mean you\u2019re covered<\/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 in construction and paid under the <strong>Construction Industry Scheme (CIS)<\/strong>, tax is usually deducted at source. This leads many people to assume their tax is already \u201csorted\u201d.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In reality:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CIS deductions are not always enough to cover the full liability<\/li>\n\n\n\n<li>National Insurance still needs calculating<\/li>\n\n\n\n<li>Other income may not be taxed at all<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Failing to account for this properly is a common reason CIS taxpayers see unexpected balances due. It\u2019s also one of the most common triggers for HMRC checks.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If CIS applies to you, it\u2019s worth reading our blog on <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<\/a><\/strong> to avoid missing anything.<\/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\">4. Untaxed income adds up quietly<\/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\">Self Assessment often covers more than people realise. Your bill may be higher because of income that wasn\u2019t taxed during the year, such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rental income<\/li>\n\n\n\n<li>Online sales or side hustles<\/li>\n\n\n\n<li>Cash-in-hand work<\/li>\n\n\n\n<li>Freelance or one-off jobs<\/li>\n\n\n\n<li>Interest above your allowance<\/li>\n\n\n\n<li>Dividends<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Individually, these may seem small. Combined, they can push you into a higher tax band or trigger Payments on Account.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why HMRC bills often feel disconnected from what people expected to pay.<\/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\">5. Missed allowances or expenses<\/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\">Another common issue isn\u2019t that you owe too much tax, but that your return didn\u2019t claim everything available.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Allowable business expenses<\/li>\n\n\n\n<li>Use of home for work<\/li>\n\n\n\n<li>Professional fees<\/li>\n\n\n\n<li>Mileage or travel costs<\/li>\n\n\n\n<li>Pension contributions<\/li>\n\n\n\n<li>Marriage Allowance where applicable<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If these aren\u2019t claimed correctly, HMRC calculates tax on a higher figure than necessary.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our blog on <strong><a href=\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/19\/self-assessment-myths-that-cause-late-filing-and-cost-taxpayers-money\/\">Self Assessment myths that cost taxpayers money<\/a><\/strong> covers this in more detail and explains where people often lose 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\">6. Student loan repayments increase the bill<\/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 have a student loan, repayments are calculated through your Self Assessment return. This can significantly increase the amount due in January, especially if your income has risen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many people forget this entirely and assume the extra amount is a penalty or error.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It isn\u2019t. It\u2019s simply another liability added to the final bill.<\/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\">7. Late filing or amendments can change the outcome<\/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 filed late, estimated figures may have been used. If you amended a return, HMRC may have recalculated your tax.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Late filing also brings penalties and interest, which are added on top of the tax owed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If this applies to you, our article on <strong><a href=\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/05\/self-assessment-not-filed-yet-what-to-do-now-to-avoid-hmrc-penalties\/\">what to do if your Self Assessment hasn\u2019t been filed yet<\/a><\/strong> explains how to limit the damage and move forward.<\/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 you can do right now<\/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 your January bill is higher than expected, there are practical steps you can take.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Check the breakdown<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Review your tax calculation, not just the total<\/li>\n\n\n\n<li>Look for Payments on Account<\/li>\n\n\n\n<li>Confirm all income sources are correct<\/li>\n<\/ul>\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\"><strong>Review allowances and expenses<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Make sure nothing valid has been missed<\/li>\n\n\n\n<li>Consider whether an amendment is needed<\/li>\n<\/ul>\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\"><strong>Don\u2019t ignore payment issues<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HMRC offers <strong>Time to Pay arrangements<\/strong><\/li>\n\n\n\n<li>Filing on time matters even if you can\u2019t pay in full<\/li>\n<\/ul>\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\"><strong>Get professional eyes on it<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A second look often reveals savings or options people miss<\/li>\n<\/ul>\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\">How Tax2u Can Help<\/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\">This is exactly where many people turn to Tax2u.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We help clients:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Understand why their Self Assessment bill is higher<\/li>\n\n\n\n<li>Check calculations and spot missed reliefs<\/li>\n\n\n\n<li>File or amend returns correctly<\/li>\n\n\n\n<li>Deal with CIS tax and reclaim overpaid deductions<\/li>\n\n\n\n<li>Reduce stress and avoid unnecessary penalties<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If your January tax bill doesn\u2019t make sense or feels unmanageable, getting proper guidance early can make a real difference.<\/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\"><strong><a href=\"https:\/\/www.tax2u.co.uk\/tax-return\/self-assessment\">If you haven\u2019t filed yet, Tax2u can handle your Self Assessment filing for you<\/a><\/strong>, explain what\u2019s driving the bill, and help you get everything submitted correctly and on time.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Opening your HMRC account in January and seeing a bigger tax bill than expected is&#8230;<\/p>\n","protected":false},"author":2,"featured_media":907,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[248,273,243],"class_list":["post-906","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-self-assessment-income-tax","tag-expenses","tag-payments","tag-self-assessment"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why your Self Assessment tax bill is higher than expected in January - Tax2u<\/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:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why your Self Assessment tax bill is higher than expected in January - Tax2u\" \/>\n<meta property=\"og:description\" content=\"Opening your HMRC account in January and seeing a bigger tax bill than expected is...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/\" \/>\n<meta property=\"og:site_name\" content=\"Tax2u\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/tax2u.co.uk\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-22T06:00:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/tax2u.co.uk\/blog\/wp-content\/uploads\/2026\/01\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1536\" \/>\n\t<meta property=\"og:image:height\" content=\"1024\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Tax2u\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@Tax2uLtd\" \/>\n<meta name=\"twitter:site\" content=\"@Tax2uLtd\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Tax2u\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/\"},\"author\":{\"name\":\"Tax2u\",\"@id\":\"https:\/\/tax2u.co.uk\/blog\/#\/schema\/person\/6494cac4afb724fe2574015e770c9698\"},\"headline\":\"Why your Self Assessment tax bill is higher than expected in January\",\"datePublished\":\"2026-01-22T06:00:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/\"},\"wordCount\":895,\"image\":{\"@id\":\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/tax2u.co.uk\/blog\/wp-content\/uploads\/2026\/01\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january.png\",\"keywords\":[\"Expenses\",\"Payments\",\"Self Assessment\"],\"articleSection\":[\"Self-Assessment &amp; Income Tax\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/\",\"url\":\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/\",\"name\":\"Why your Self Assessment tax bill is higher than expected in January - Tax2u\",\"isPartOf\":{\"@id\":\"https:\/\/tax2u.co.uk\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/tax2u.co.uk\/blog\/wp-content\/uploads\/2026\/01\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january.png\",\"datePublished\":\"2026-01-22T06:00:00+00:00\",\"author\":{\"@id\":\"https:\/\/tax2u.co.uk\/blog\/#\/schema\/person\/6494cac4afb724fe2574015e770c9698\"},\"breadcrumb\":{\"@id\":\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#primaryimage\",\"url\":\"https:\/\/tax2u.co.uk\/blog\/wp-content\/uploads\/2026\/01\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january.png\",\"contentUrl\":\"https:\/\/tax2u.co.uk\/blog\/wp-content\/uploads\/2026\/01\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january.png\",\"width\":1536,\"height\":1024,\"caption\":\"January Self Assessment bills often feel higher when paperwork, timing, and tax rules collide.\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/tax2u.co.uk\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Why your Self Assessment tax bill is higher than expected in January\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/tax2u.co.uk\/blog\/#website\",\"url\":\"https:\/\/tax2u.co.uk\/blog\/\",\"name\":\"Tax2u\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/tax2u.co.uk\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/tax2u.co.uk\/blog\/#\/schema\/person\/6494cac4afb724fe2574015e770c9698\",\"name\":\"Tax2u\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/tax2u.co.uk\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/5f00e4cd4c61b19ea00fe3e6014af0c4394a2678f1263cd6fb7dbf34db866e17?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/5f00e4cd4c61b19ea00fe3e6014af0c4394a2678f1263cd6fb7dbf34db866e17?s=96&d=mm&r=g\",\"caption\":\"Tax2u\"},\"url\":\"https:\/\/tax2u.co.uk\/blog\/author\/faisal\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Why your Self Assessment tax bill is higher than expected in January - Tax2u","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/","og_locale":"en_US","og_type":"article","og_title":"Why your Self Assessment tax bill is higher than expected in January - Tax2u","og_description":"Opening your HMRC account in January and seeing a bigger tax bill than expected is...","og_url":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/","og_site_name":"Tax2u","article_publisher":"https:\/\/www.facebook.com\/tax2u.co.uk","article_published_time":"2026-01-22T06:00:00+00:00","og_image":[{"width":1536,"height":1024,"url":"https:\/\/tax2u.co.uk\/blog\/wp-content\/uploads\/2026\/01\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january.png","type":"image\/png"}],"author":"Tax2u","twitter_card":"summary_large_image","twitter_creator":"@Tax2uLtd","twitter_site":"@Tax2uLtd","twitter_misc":{"Written by":"Tax2u","Est. reading time":"5 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#article","isPartOf":{"@id":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/"},"author":{"name":"Tax2u","@id":"https:\/\/tax2u.co.uk\/blog\/#\/schema\/person\/6494cac4afb724fe2574015e770c9698"},"headline":"Why your Self Assessment tax bill is higher than expected in January","datePublished":"2026-01-22T06:00:00+00:00","mainEntityOfPage":{"@id":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/"},"wordCount":895,"image":{"@id":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#primaryimage"},"thumbnailUrl":"https:\/\/tax2u.co.uk\/blog\/wp-content\/uploads\/2026\/01\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january.png","keywords":["Expenses","Payments","Self Assessment"],"articleSection":["Self-Assessment &amp; Income Tax"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/","url":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/","name":"Why your Self Assessment tax bill is higher than expected in January - Tax2u","isPartOf":{"@id":"https:\/\/tax2u.co.uk\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#primaryimage"},"image":{"@id":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#primaryimage"},"thumbnailUrl":"https:\/\/tax2u.co.uk\/blog\/wp-content\/uploads\/2026\/01\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january.png","datePublished":"2026-01-22T06:00:00+00:00","author":{"@id":"https:\/\/tax2u.co.uk\/blog\/#\/schema\/person\/6494cac4afb724fe2574015e770c9698"},"breadcrumb":{"@id":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#primaryimage","url":"https:\/\/tax2u.co.uk\/blog\/wp-content\/uploads\/2026\/01\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january.png","contentUrl":"https:\/\/tax2u.co.uk\/blog\/wp-content\/uploads\/2026\/01\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january.png","width":1536,"height":1024,"caption":"January Self Assessment bills often feel higher when paperwork, timing, and tax rules collide."},{"@type":"BreadcrumbList","@id":"https:\/\/tax2u.co.uk\/blog\/2026\/01\/22\/why-your-self-assessment-tax-bill-is-higher-than-expected-in-january\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/tax2u.co.uk\/blog\/"},{"@type":"ListItem","position":2,"name":"Why your Self Assessment tax bill is higher than expected in January"}]},{"@type":"WebSite","@id":"https:\/\/tax2u.co.uk\/blog\/#website","url":"https:\/\/tax2u.co.uk\/blog\/","name":"Tax2u","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/tax2u.co.uk\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/tax2u.co.uk\/blog\/#\/schema\/person\/6494cac4afb724fe2574015e770c9698","name":"Tax2u","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/tax2u.co.uk\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/5f00e4cd4c61b19ea00fe3e6014af0c4394a2678f1263cd6fb7dbf34db866e17?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/5f00e4cd4c61b19ea00fe3e6014af0c4394a2678f1263cd6fb7dbf34db866e17?s=96&d=mm&r=g","caption":"Tax2u"},"url":"https:\/\/tax2u.co.uk\/blog\/author\/faisal\/"}]}},"_links":{"self":[{"href":"https:\/\/tax2u.co.uk\/blog\/wp-json\/wp\/v2\/posts\/906","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tax2u.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tax2u.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tax2u.co.uk\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/tax2u.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=906"}],"version-history":[{"count":1,"href":"https:\/\/tax2u.co.uk\/blog\/wp-json\/wp\/v2\/posts\/906\/revisions"}],"predecessor-version":[{"id":908,"href":"https:\/\/tax2u.co.uk\/blog\/wp-json\/wp\/v2\/posts\/906\/revisions\/908"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tax2u.co.uk\/blog\/wp-json\/wp\/v2\/media\/907"}],"wp:attachment":[{"href":"https:\/\/tax2u.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=906"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tax2u.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=906"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tax2u.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=906"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}