{"id":1402,"date":"2025-11-24T16:05:49","date_gmt":"2025-11-24T16:05:49","guid":{"rendered":"https:\/\/www.simplybusiness.co.uk\/\/knowledge\/business-tax\/hmrc-tax-investigation\/"},"modified":"2026-03-10T14:07:06","modified_gmt":"2026-03-10T14:07:06","slug":"hmrc-tax-investigation","status":"publish","type":"knowledge","link":"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-investigation\/","title":{"rendered":"What is an HMRC tax investigation?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">An investigation by HMRC is rarely a welcome prospect for small business owners and sole traders. It can be a stressful process that takes up a lot of time \u2013 and it may lead to a higher tax bill.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Everyone hopes they won\u2019t experience an HMRC investigation, but it\u2019s important to be prepared just in case. So whether you\u2019re facing one or want to make sure you won&#8217;t have to deal with one, our guide explains some key points to be aware of.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">When does HMRC investigate the self-employed?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">There are several reasons why HMRC might investigate a business\u2019s tax affairs. This could be because:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\">it receives a tip off<\/li>\n\n\n\n<li class=\"wp-block-list-item\">you make a mistake or fail to include something on your tax return<\/li>\n\n\n\n<li class=\"wp-block-list-item\">there are large fluctuations in your reported figures, for example income or business expenses<\/li>\n\n\n\n<li class=\"wp-block-list-item\">your figures look dramatically different to what\u2019s normal for a business in your industry<\/li>\n\n\n\n<li class=\"wp-block-list-item\">you report that the company directors are earning less than employees<\/li>\n\n\n\n<li class=\"wp-block-list-item\">it suspects you&#8217;re not including all your income<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What happens if HMRC investigates you?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A self-employed tax investigation can look into fraud and other criminal offences relating to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\"><a href=\"\/knowledge\/business-tax\/income-tax-rates\/\" data-type=\"knowledge\" data-id=\"1464\">income tax<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"\/knowledge\/business-tax\/capital-gains-tax\/\" data-type=\"knowledge\" data-id=\"1361\">capital gains tax<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"\/knowledge\/trades\/construction-industry-scheme-guide\/\" data-type=\"knowledge\" data-id=\"1240\">Construction Industry Scheme<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"\/knowledge\/business-tax\/when-is-corporation-tax-due\/\" data-type=\"knowledge\" data-id=\"1592\">corporation tax<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"\/knowledge\/business-tax\/vat-registration-threshold-small-business-guide\/\" data-type=\"knowledge\" data-id=\"1556\">VAT<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">It\u2019s also possible to be investigated when something looks suspicious to the tax body, but it can be explained or a genuine mistake. That\u2019s why it\u2019s important to keep accurate records of 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 in case you need to provide these as evidence.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What can HMRC check?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If HMRC launches an investigation into you or your business, there&#8217;s a range of records and documents it might check. They&#8217;ll contact you or your accountant in advance to set out the evidence they want to see or information they&#8217;re collecting. Generally this will include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\">information on the taxes you\u2019ve paid (remember that this isn\u2019t just limited to income tax or corporation tax)<\/li>\n\n\n\n<li class=\"wp-block-list-item\">your books, and details of the tax calculations you\u2019ve made<\/li>\n\n\n\n<li class=\"wp-block-list-item\">annual returns, if the investigation is into a limited company<\/li>\n\n\n\n<li class=\"wp-block-list-item\">your <a href=\"\/knowledge\/business-tax\/self-employed-tax-changes\/\" data-type=\"knowledge\" data-id=\"1514\">Self Assessment returns<\/a>, if the investigation is into a sole trader. In addition, HMRC may wish to see Self Assessments for company directors, if the investigation is into a limited company<\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"\/knowledge\/staff\/paying-paye-tax-guide-for-employers\/\" data-type=\"knowledge\" data-id=\"1493\">PAYE<\/a> records, where applicable<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the different types of HMRC investigation?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not all enquiries by HMRC are the same, and the type of investigation depends on its suspicions or concerns. There are three main types of tax investigation:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Full enquiry<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">These may take place when HMRC believes there&#8217;s a high risk of errors on your returns. If you\u2019re subject to a full enquiry, the tax authority will look through all of your business records \u2013 and, potentially, the personal records of any company directors.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Aspect enquiry<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">An aspect enquiry happens when HMRC is concerned about one or more specific elements of your finances. This type of enquiry is much more common in the case of genuine mistakes, as opposed to wilful <a href=\"\/knowledge\/business-tax\/difference-between-tax-avoidance-and-tax-evasion\/\" data-type=\"knowledge\" data-id=\"1124\">tax evasion<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Random check<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Of course, sometimes there\u2019s seemingly no reason to be selected for a HMRC check. Random checks can happen to your business whether or not HMRC notices errors in your tax return.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What happens during an HMRC visit?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">HMRC needs to stick to strict procedures when visiting. You might want to ask for a copy of the rules in advance (or your accountant may be able to advise).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The tax inspector may ask to visit you at your business premises, home, or your accountant&#8217;s office. Or, they may ask you to visit them. They can&#8217;t legally force you to attend, but doing so willingly is generally seen as a sign of cooperation and may have an impact on the outcome of the investigation. You&#8217;re entitled to have an advisor such as your accountant present.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HMRC must tell you what it wants to discuss in advance of a visit. You&#8217;re also entitled to ask for the agenda in writing before the appointment, and the HMRC officials must stick to this agenda. It&#8217;s important that you answer the questions to the best of your knowledge, and that you give complete and accurate information.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How likely are you to be investigated by HMRC?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">As mentioned, HMRC investigating small businesses and sole traders can be triggered by a number of things. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, if you work in an industry or area HMRC considers high risk or perhaps if you take a lot of cash payments in your business. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How do I know if HMRC is investigating me?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The first indication that HMRC is investigating you is when they send you a letter in the post. This letter will inform you that an official investigation has begun and also let you know what aspect of your business is being investigated \u2013 whether this be your latest tax return or something wider.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How long does a HMRC investigation take?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The length of your HMRC tax investigation will depend on why your business is being investigated. A smaller investigation may be completed within three months, but a full tax investigation covering your whole business could take up to 18 months.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HMRC investigations into smaller businesses will often take less time to complete than those into larger businesses.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How far back can HMRC investigate your taxes?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In most cases, HMRC can investigate a taxpayer&#8217;s returns for the past four years, to see if it\u2019s owed any money by the taxpayer under investigation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your returns are full of obvious mistakes, HMRC can go back six years in its investigation. And if it looks like you&#8217;ve been deliberately trying to avoid paying tax, it can go back through 20 years\u2019 worth of your tax returns.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What happens after an HMRC investigation?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Once the investigation finishes, HMRC will write to you to explain the outcome.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If HMRC finds something wrong on your returns but doesn\u2019t believe the errors were made fraudulently or negligently, you\u2019ll be told how to correct the return. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You have 30 days to make the correction. If you fail to do so within this time, HMRC can correct the return itself.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If HMRC believes you\u2019ve acted with negligence or fraudulently, you&#8217;ll be made to pay penalties, extra tax, and interest. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You&#8217;ll normally need to sign a contract pledging to do so, in exchange for HMRC waiving its right to prosecute. It&#8217;s important to get legal advice if this happens to you.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">More small business tax guides<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"wp-block-list-item\"><a href=\"\/knowledge\/business-tax\/what-is-ir35\/\" data-type=\"knowledge\" data-id=\"1579\">What is IR35? A guide for the self-employed<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"\/knowledge\/business-tax\/self-employed-tax-changes\/\" data-type=\"knowledge\" data-id=\"1514\">How to get a tax refund if you&#8217;re self-employed<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"\/knowledge\/business-tax\/what-happens-if-im-inside-ir35\/\" data-type=\"knowledge\" data-id=\"1563\">Being inside IR35 and outside IR35, what does it mean?<\/a><\/li>\n\n\n\n<li class=\"wp-block-list-item\"><a href=\"\/business-insurance\/faq\/what-type-of-business-insurance-do-i-need\/\" data-type=\"page\" data-id=\"372\">What type of business insurance do I need?<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>This article is just a guide \u2013 you should always seek professional advice if you face a tax investigation.<\/strong><\/p>\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=\"isyourbusinessinsured\">Is your business insured?<\/h3>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">We have 800,000 UK policies plus a 9\/10 satisfaction score. Why not take a look at our expert <a href=\"\/business-insurance\/\" data-type=\"page\" data-id=\"5152\">business insurance<\/a> options &#8211; including <a href=\"\/business-insurance\/public-liability-insurance\/\" data-type=\"page\" data-id=\"734\">public liability insurance<\/a> and <a href=\"\/business-insurance\/professional-indemnity-insurance\/\" data-type=\"page\" data-id=\"720\">professional indemnity<\/a> &#8211; and run a quick quote to get started?<\/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<div id=\"nba-body-end\">\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Are you worried about an HMRC investigation or enquiry? Read on to find out what to expect, and why HMRC investigates self-employed business owners.<\/p>\n","protected":false},"author":3,"featured_media":3808,"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":[336,344,110],"hidden-category":[],"coauthors":[24],"class_list":["post-1402","knowledge","type-knowledge","status-publish","has-post-thumbnail","hentry","category-business-structure","category-business-tax","category-business-news"],"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>HMRC tax investigation: does HMRC investigate self-employed?<\/title>\n<meta name=\"description\" content=\"Are you worried about an HMRC investigation or enquiry? Read on to find out what to expect, and why HMRC investigates self-employed business owners.\" \/>\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.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-investigation\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is an HMRC tax investigation?\" \/>\n<meta property=\"og:description\" content=\"Are you worried about an HMRC investigation? Read on to see why HMRC investigates the self-employed.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-investigation\/\" \/>\n<meta property=\"og:site_name\" content=\"Simply Business UK\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/simplybusiness\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-10T14:07:06+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.simplybusiness.co.uk\/wp-content\/uploads\/sites\/3\/2024\/06\/hmrc-delays-what-does-this-mean-for-self-assessment-deadline.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@simplybusiness\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"6 minutes\" \/>\n\t<meta name=\"twitter:label2\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data2\" content=\"Rosanna Parrish\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-investigation\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-investigation\/\"},\"author\":{\"@type\":\"Person\",\"name\":\"Rosanna Parrish\",\"description\":\"Rosanna Parrish is a Copywriter at Simply Business specialising in side hustles \u2013 as well as all things freelance, social media, and ecommerce. 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Starting her career in health insurance, she also worked in education marketing before returning to the insurance world. <a href=\\\"https:\/\/www.linkedin.com\/in\/rosannaparrish\/\\\" target=\\\"_blank\\\" rel=\\\"noopener\\\">Connect with Rosanna on LinkedIn.<\/a>\"},\"headline\":\"What is an HMRC tax investigation?\",\"datePublished\":\"2025-11-24T16:05:49+00:00\",\"dateModified\":\"2026-03-10T14:07:06+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-investigation\/\"},\"wordCount\":1197,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.simplybusiness.co.uk\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-investigation\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.simplybusiness.co.uk\/wp-content\/uploads\/sites\/3\/2024\/05\/hmrc-delays-what-does-this-mean-for-self-assessment-deadline.jpg\",\"articleSection\":[\"Business structure\",\"Business tax\",\"Small business news\"],\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-investigation\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-investigation\/\",\"url\":\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-investigation\/\",\"name\":\"HMRC tax investigation: does HMRC investigate self-employed?\",\"isPartOf\":{\"@id\":\"https:\/\/www.simplybusiness.co.uk\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-investigation\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.simplybusiness.co.uk\/knowledge\/business-tax\/hmrc-tax-investigation\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.simplybusiness.co.uk\/wp-content\/uploads\/sites\/3\/2024\/05\/hmrc-delays-what-does-this-mean-for-self-assessment-deadline.jpg\",\"datePublished\":\"2025-11-24T16:05:49+00:00\",\"dateModified\":\"2026-03-10T14:07:06+00:00\",\"description\":\"Are you worried about an HMRC investigation or enquiry? 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