{"id":103,"date":"2019-05-28T13:57:13","date_gmt":"2019-05-28T12:57:13","guid":{"rendered":"https:\/\/taxfix.com\/en-uk\/?p=103"},"modified":"2025-10-06T14:39:02","modified_gmt":"2025-10-06T13:39:02","slug":"what-is-a-p800","status":"publish","type":"post","link":"https:\/\/taxfix.com\/en-uk\/self-assessment-basics\/what-is-a-p800\/","title":{"rendered":"The P800 form: what to do if HMRC sent you one"},"content":{"rendered":"\n<p>A <a href=\"https:\/\/taxfix.com\/en-uk\/glossary\/p800\/\">P800 form<\/a>, also known as a tax calculation, is a letter that HMRC will send you at the end of the tax year if they think that you have not paid the right amount of tax.&nbsp;<\/p>\n\n\n\n<p>If you\u2019ve received a p800, then you\u2019ve either paid one of the two:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Too much tax<\/li>\n\n\n\n<li>Too little tax<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What if I think that my P800 form is wrong?<\/h2>\n\n\n\n<p>It can happen! P800s aren\u2019t always correct.<\/p>\n\n\n\n<p>But luckily, there are options. You\u2019ll have to:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Compare it with your <a href=\"https:\/\/taxfix.com\/en-uk\/glossary\/p60\/\">P60<\/a>, <a href=\"https:\/\/taxfix.com\/en-uk\/what-is-p45-form\">P45<\/a>, and <a href=\"https:\/\/taxfix.com\/en-uk\/glossary\/p11d\/\">P11D<\/a> forms<\/li>\n\n\n\n<li>Check that HMRC included your flat rate job expenses (uniform laundry allowance, etc.)<\/li>\n\n\n\n<li>Check that HMRC also included your regular job expenses (mileage allowances, professional subscription fees, parking fees, business phone call, travel and overnight costs, etc.)<\/li>\n\n\n\n<li>Also check for adjustments like the <a href=\"https:\/\/taxfix.com\/en-uk\/marriage-allowance-guide\/\">married couples\u2019 allowance<\/a>, etc.<\/li>\n<\/ol>\n\n\n\n<p>After double (or triple) checking, you may find:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your P800 is correct \u2013 you don\u2019t need to do anything<\/li>\n\n\n\n<li>You overpaid tax \u2013 HMRC will refund you within 4 weeks<\/li>\n\n\n\n<li>You underpaid tax but it\u2019s less than \u00a33,000 \u2013 HMRC will collect the tax directly through your <a href=\"https:\/\/taxfix.com\/en-uk\/glossary\/tax-code\/\">tax code<\/a><\/li>\n\n\n\n<li>You underpaid tax and it\u2019s more than \u00a33,000 \u2013 HMRC will contact you about a special repayment schedule<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">It says I can get a tax refund. How do I get it?<\/h2>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>Online<\/strong><\/h5>\n\n\n\n<p>To claim an online tax rebate, you\u2019ll need to:&nbsp;<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Go to the <a href=\"https:\/\/www.gov.uk\/check-income-tax-last-year\">HMRC website<\/a><\/li>\n\n\n\n<li>Sign in to your <a href=\"https:\/\/taxfix.com\/en-uk\/hmrc-personal-tax-account-setup\">Personal Tax Account<\/a> using your <a href=\"https:\/\/taxfix.com\/en-uk\/find-government-gateway-user-id\">Government Gateway User ID<\/a><\/li>\n\n\n\n<li>Follow the steps to request a refund<\/li>\n<\/ol>\n\n\n\n<p>Once you finish, you should receive the rebate to your bank account in approximately 5 working days.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>By phone<\/strong><\/h5>\n\n\n\n<p>You can also call HMRC on 0300 200 3300 where an advisor will process your tax refund.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>Wait for a cheque<\/strong><\/h5>\n\n\n\n<p>If you don\u2019t do anything, HMRC will automatically send you a cheque through the post within 14-45 days from the date on your P800.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What if my P800 says I owe tax?<\/h2>\n\n\n\n<p>HMRC will either collect the tax you owe <a href=\"https:\/\/taxfix.com\/en-uk\/what-is-paye\/\">through your PAYE tax code<\/a> or ask you to pay directly.<\/p>\n\n\n\n<p>This will depend on factors such as whether you\u2019re self-employed or employed and how much tax you owe.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What if I have P800s from multiple years?<\/h2>\n\n\n\n<p>Each form includes the previous years, so you only need the one from the final year.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">I didn\u2019t get one. Can I still claim a tax refund?<\/h2>\n\n\n\n<p>The short answer is yes.<\/p>\n\n\n\n<p>You could still be owed tax from any expenses or tax reliefs that HMRC doesn\u2019t know about.<\/p>\n\n\n\n<p>For example, if you work in construction, you might want to claim the <a href=\"https:\/\/taxfix.com\/en-uk\/calculator\/mileage-tax-calculator\/\" target=\"_blank\" rel=\"noreferrer noopener\">mileage allowance<\/a>.<\/p>\n\n\n\n<p>In this case, we\u2019d recommend getting in touch with HMRC as soon as possible.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A P800 form, also known as a tax calculation, is a letter that HMRC will send you at the end of the tax year if they think that you have not paid the right amount of tax.&nbsp; If you\u2019ve received a p800, then you\u2019ve either paid one of the two: What if I think that [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[437,435],"tags":[102],"class_list":["post-103","post","type-post","status-publish","format-standard","hentry","category-documents-and-forms","category-self-assessment-basics","tag-hmrc"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The P800 form: what to do if HMRC sent you one &#8211; Taxfix<\/title>\n<meta name=\"description\" content=\"If HMRC thinks you haven&#039;t paid the right amount of tax, you&#039;ll receive a P800. 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