{"id":1412,"date":"2026-09-28T06:27:54","date_gmt":"2026-09-28T06:27:54","guid":{"rendered":"https:\/\/www.bsassociate.co.uk\/blog\/?p=1412"},"modified":"2026-09-28T06:27:56","modified_gmt":"2026-09-28T06:27:56","slug":"accountancy-firm-london-who-is-watching-your-hmrc-deadlines","status":"publish","type":"post","link":"https:\/\/www.bsassociate.co.uk\/blog\/accountancy-firm-london-who-is-watching-your-hmrc-deadlines\/","title":{"rendered":"Accountancy Firm London: Who Is Watching Your HMRC Deadlines?\u00a0"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A late filing fee does not care how busy you were. HMRC and Companies House issue penalties automatically, and in 2026 several of them got bigger.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That is why choosing the right <a href=\"https:\/\/www.bsassociate.co.uk\/accountancy-firm-london.php\" target=\"_blank\" rel=\"noopener\">Accountancy Firm London<\/a> businesses can depend on matters more than ever. A good firm does not just file your returns. It owns your deadlines, explains what each one costs, and warns you before trouble starts.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quick answer:<\/strong> A reliable accountancy firm in London tracks every HMRC and Companies House date for you, files accurate returns on time, and tells you in advance what a missed deadline would cost. This guide shows which dates matter, what HMRC actually says, and how to check your accountant.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What should an accountancy firm in London do for your business?<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Many owners still think an accountant only appears at year end. However, HMRC&#8217;s own guidance says you stay responsible for your figures even when an agent files them. So you need a firm that works with you all year.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A strong Accountancy Firm London owners can rely on should handle:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bookkeeping and management accounts, so your numbers are ready before deadlines\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Corporation Tax, VAT and Self Assessment filings\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Payroll and real time reporting to HMRC\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Statutory accounts and Companies House filings\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tax planning that fits your profit level\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Audit support when your company needs it\u00a0<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For the wider picture, read our guide on <a href=\"https:\/\/www.bsassociate.co.uk\/blog\/best-accountancy-firm-london\/\" target=\"_blank\" rel=\"noopener\">what modern accountants offer London businesses<\/a>.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>7 deadlines your Accountancy Firm London must own<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Use this table as a quick test. If your accountant cannot tell you these dates for your company, ask why.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Deadline<\/strong>&nbsp;<\/td><td><strong>When it is due<\/strong>&nbsp;<\/td><td><strong>Cost of missing it<\/strong>&nbsp;<\/td><\/tr><tr><td>Corporation Tax payment&nbsp;<\/td><td>9 months and 1 day after year end&nbsp;<\/td><td>Interest from the day after&nbsp;<\/td><\/tr><tr><td>Company Tax Return (CT600)&nbsp;<\/td><td>12 months after the accounting period ends&nbsp;<\/td><td>\u00a3200 from day one, another \u00a3200 at 3 months, then 10% charges&nbsp;<\/td><\/tr><tr><td>Companies House accounts&nbsp;<\/td><td>9 months after year end for private companies&nbsp;<\/td><td>\u00a3150 to \u00a31,500, doubled if late two years running&nbsp;<\/td><\/tr><tr><td>Confirmation statement and director ID check&nbsp;<\/td><td>Confirmation statement every year; ID transition ends 18 November 2026&nbsp;<\/td><td>Filing can be blocked&nbsp;<\/td><\/tr><tr><td>VAT return and payment&nbsp;<\/td><td>1 month and 7 days after the VAT period&nbsp;<\/td><td>\u00a3200 once quarterly filers reach 4 penalty points&nbsp;<\/td><\/tr><tr><td>MTD for Income Tax quarterly update&nbsp;<\/td><td>7 August, 7 November, 7 February, 7 May&nbsp;<\/td><td>No points in 2026 to 2027, then \u00a3200 at 4 points&nbsp;<\/td><\/tr><tr><td>Self Assessment return&nbsp;<\/td><td>31 January&nbsp;<\/td><td>Late filing and late payment penalties&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>The \u00a3200 penalty trap<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Three HMRC regimes now use a \u00a3200 figure, so it is easy to mix them up.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">First, the Company Tax Return. <a href=\"https:\/\/www.gov.uk\/company-tax-returns\/penalties-for-late-filing\" target=\"_blank\" rel=\"noopener\">GOV.UK now lists a \u00a3200 penalty<\/a> one day after the deadline, plus another \u00a3200 at three months. If your return is three times late in a row, each fixed penalty rises to \u00a31,000. HMRC then adds 10% of unpaid tax at six months and again at twelve months.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Second, VAT. Every late return earns a penalty point. Quarterly filers reach the threshold at four points, and a \u00a3200 penalty follows. Each further late return adds another \u00a3200.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Third, Making Tax Digital for Income Tax. HMRC confirmed that <a href=\"https:\/\/gov.uk\/guidance\/penalties-for-making-tax-digital-for-income-tax\" target=\"_blank\" rel=\"noopener\">no penalty points apply for late quarterly updates in 2026 to 2027<\/a>. After that, four points also triggered a \u00a3200 penalty. However, late payment and late Self Assessment penalties still apply today.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because these rules run side by side, one messy year can trigger several charges at once. A good accountant keeps a single calendar for all of them.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Companies House ID checks: the deadline directors forget<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Identity verification became a legal requirement on 18 November 2025. That date started a 12 month transition period, so it ends on 18 November 2026, about seven weeks from now.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">New directors must verify before they are appointed. Existing directors need a personal code, and it is required when the company files its next confirmation statement. If one director has not verified, that filing cannot go through. The duty sits with each individual, so a company with three directors needs three checks.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Also remember that <a href=\"https:\/\/www.gov.uk\/government\/publications\/late-filing-penalties-from-companies-house\/late-filing-penalties\" target=\"_blank\" rel=\"noopener\">failing to file accounts or confirmation statements is a criminal offence<\/a>, and directors can be fined personally. Ask your accountant to confirm each director has verified, using Companies House guidance on identity verification. Our <a href=\"https:\/\/www.bsassociate.co.uk\/company-secretarial.php\" target=\"_blank\" rel=\"noopener\">company secretarial team<\/a> can also support your filings.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Corporation Tax: why profits between \u00a350,000 and \u00a3250,000 need planning<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The Corporation Tax rates are unchanged for the financial year starting 1 April 2026. Companies pay 19% on profits up to \u00a350,000 and 25% on profits above \u00a3250,000. Between those figures, marginal relief gradually lifts the effective rate from 19% to 25%.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is the catch. Inside that band, each extra pound of profit is taxed at about 26.5%, because you lose relief as profit rises. That is higher than the main rate itself.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, a standalone company with \u00a3100,000 of profit pays an effective rate of 22.75%. Those limits are also shared between associated companies. So early planning can change the outcome. Timing of spend, director pay and pension contributions can all affect where your profit lands.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An experienced <a href=\"https:\/\/www.bsassociate.co.uk\/accountant-and-tax-specialist-in-london.php\" target=\"_blank\" rel=\"noopener\">accountant and tax specialist<\/a> will model this before your year end, not after it. Our <a href=\"https:\/\/www.bsassociate.co.uk\/tax-advisory-firm-in-london.php\" target=\"_blank\" rel=\"noopener\">tax advisory team<\/a> does exactly that.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Do you need Financial Audit Services London?<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not every company needs an audit. For financial years beginning on or after 6 April 2025, a company can usually claim exemption if it meets at least two of three tests:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Turnover of \u00a315 million or less\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Balance sheet total of \u00a37.5 million or less\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>50 or fewer employees on average\u00a0<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">However, exemption is not automatic. Public companies, banks and insurers must still be audited, and subsidiaries of larger groups can lose it. Some directors also choose a voluntary audit because lenders or buyers want independent assurance.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Brayan &amp; Spencer Associates is registered as auditors in the UK by ACCA. So we can check your position and advise whether you need <a href=\"https:\/\/www.bsassociate.co.uk\/audit-assurance-services.php\" target=\"_blank\" rel=\"noopener\">Financial Audit Services London<\/a> or can safely claim exemption. Our <a href=\"https:\/\/www.bsassociate.co.uk\/blog\/financial-audit-services-uk\/\" target=\"_blank\" rel=\"noopener\">audit day guide<\/a> explains what to expect.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How to check any London accountant using HMRC guidance<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">HMRC warns that anyone can call themselves a tax agent, and that it does not regulate agents. So the choice is yours. Use these checks from <a href=\"https:\/\/www.gov.uk\/guidance\/how-to-choose-a-tax-agent\" target=\"_blank\" rel=\"noopener\">GOV.UK&#8217;s guidance on choosing a tax agent<\/a>:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ask whether they hold recognised qualifications or belong to a professional body\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Confirm they are registered for online access with HMRC and meet HMRC&#8217;s agent standards\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Meet the person who will deal with HMRC for you\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Agree fees before work starts\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check they cover everything you need, such as payroll, VAT or audit\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Never sign a blank return, and never share your HMRC sign in details\u00a0<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Even with an agent, the figures on your return remain your responsibility. That is why a clear, open relationship matters.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What HMRC says about Making Tax Digital right now<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In August, HMRC reported that more than 436,000 sole traders and landlords had sent their first quarterly update. From September, HMRC began signing up customers who need MTD for 2026 to 2027 but have not joined yet.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The threshold falls to \u00a330,000 in April 2027 and \u00a320,000 in April 2028. The next quarterly deadline is 7 November 2026. Our guide to <a href=\"https:\/\/www.bsassociate.co.uk\/blog\/mtd-second-quarterly-update-november-2026\/\" target=\"_blank\" rel=\"noopener\">what 7 November means for you<\/a> covers the steps. You can also ask yourself whether <a href=\"https:\/\/www.bsassociate.co.uk\/blog\/accountant-tax-adviser-london-mtd-test\/\" target=\"_blank\" rel=\"noopener\">your accountant has mentioned MTD penalty points<\/a>.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How Brayan &amp; Spencer Associates supports London businesses<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Our <a href=\"https:\/\/www.bsassociate.co.uk\/accounting-tax-solution-uk\/\" target=\"_blank\" rel=\"noopener\">Accounting &amp; Tax Services in London<\/a> cover the full deadline calendar above. Our accounting services London clients use include <a href=\"https:\/\/www.bsassociate.co.uk\/bookkeepers-in-london.php\" target=\"_blank\" rel=\"noopener\">bookkeeping<\/a>, <a href=\"https:\/\/www.bsassociate.co.uk\/payroll-services.php\" target=\"_blank\" rel=\"noopener\">payroll<\/a>, <a href=\"https:\/\/www.bsassociate.co.uk\/self-assessment-tax-return-accountants-london.php\" target=\"_blank\" rel=\"noopener\">Self Assessment<\/a>, <a href=\"https:\/\/www.bsassociate.co.uk\/statutory-and-management.php\" target=\"_blank\" rel=\"noopener\">statutory and management accounts<\/a>, VAT and Corporation Tax.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You get a free consultation, in person or by phone. Then we prepare a fixed fee quote tailored to what you need, so you only pay for the support you use.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ready to stop worrying about deadlines?<\/strong> Call <strong>0207 183 5956<\/strong> or visit <a href=\"https:\/\/www.bsassociate.co.uk\/\" target=\"_blank\" rel=\"noopener\">www.bsassociate.co.uk<\/a> to speak with a London accountancy team today.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Frequently asked questions<\/strong>&nbsp;<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1790575229240\"><strong class=\"schema-faq-question\"><strong><em>What does an accountancy firm in London do?<\/em><\/strong><em>\u00a0<\/em><\/strong> <p class=\"schema-faq-answer\">An accountancy firm in London prepares your accounts and tax returns, manages bookkeeping, payroll and VAT, files with HMRC and Companies House, and advises on tax planning. A good firm also tracks your deadlines and explains the cost of missing them.\u00a0<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1790575246857\"><strong class=\"schema-faq-question\"><strong><em>What is the penalty for filing a Company Tax Return late?<\/em><\/strong><em>\u00a0<\/em><\/strong> <p class=\"schema-faq-answer\">GOV.UK lists \u00a3200 one day after the deadline and another \u00a3200 at three months. HMRC then adds 10% of unpaid tax at six and twelve months. Three late returns in a row raise each fixed penalty to \u00a31,000.\u00a0<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1790575266735\"><strong class=\"schema-faq-question\"><strong><em>When must a private company file accounts at Companies House?<\/em><\/strong><em>\u00a0<\/em><\/strong> <p class=\"schema-faq-answer\">Private companies normally file within nine months of their financial year end. Late accounts trigger an automatic penalty from \u00a3150 to \u00a31,500, and the amount doubles if you file late two years running.\u00a0<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1790575290221\"><strong class=\"schema-faq-question\"><strong><em>Does my company need an audit?<\/em><\/strong><em>\u00a0<\/em><\/strong> <p class=\"schema-faq-answer\">Usually not, if you meet two of three limits: turnover up to \u00a315 million, balance sheet up to \u00a37.5 million, and 50 employees or fewer. However, group structure and company type can remove the exemption.\u00a0<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1790575301278\"><strong class=\"schema-faq-question\"><strong><em>Do company directors need to verify their identity?<\/em><\/strong><em>\u00a0<\/em><\/strong> <p class=\"schema-faq-answer\">Yes. Verification became mandatory on 18 November 2025. Existing directors must verify by their next confirmation statement, and the transition period ends on 18 November 2026.\u00a0<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1790575326777\"><strong class=\"schema-faq-question\"><strong><em>How do I choose a reliable accountant?<\/em><\/strong><em>\u00a0<\/em><\/strong> <p class=\"schema-faq-answer\">Follow HMRC&#8217;s advice. Check qualifications or professional body membership, confirm HMRC online access and agent standards, meet the person handling your tax, and agree fees in writing. You can also read our <a href=\"https:\/\/www.bsassociate.co.uk\/faq.php\" target=\"_blank\" rel=\"noopener\">FAQ page<\/a> or <a href=\"https:\/\/www.bsassociate.co.uk\/contact-us.php\" target=\"_blank\" rel=\"noopener\">contact us<\/a>.\u00a0<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>A late filing fee does not care how busy you were. HMRC and Companies House issue penalties automatically, and in 2026 several of them got bigger.&nbsp; That is why choosing the right Accountancy Firm London businesses can depend on matters more than ever. A good firm does not just file your returns. It owns your [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1413,"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":"","ast-disable-related-posts":"","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":[73],"tags":[72,65,66],"class_list":["post-1412","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-accounting-services-london","tag-accountancy-firm-london","tag-accounting-services-in-london","tag-tax-advisers-in-london"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Accountancy Firm London: Who Watches Your HMRC Deadlines?<\/title>\n<meta name=\"description\" content=\"Looking for an Accountancy Firm London businesses trust? See the HMRC deadlines, \u00a3200 penalties and checks that keep you compliant. Call 0207 183 5956.\" \/>\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\/accountancy-firm-london-who-is-watching-your-hmrc-deadlines\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Accountancy Firm London: Who Watches Your HMRC Deadlines?\" \/>\n<meta property=\"og:description\" content=\"Looking for an Accountancy Firm London businesses trust? See the HMRC deadlines, \u00a3200 penalties and checks that keep you compliant. 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