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You must send your tax return <a href=\"/self-assessment-tax-returns/deadlines\">by the deadline</a> or you’ll <a href=\"/self-assessment-tax-returns/penalties\">get a penalty</a>.</p>\n\n<div role=\"note\" aria-label=\"Information\" class=\"application-notice info-notice\">\n  <p>This service is also available <a href=\"/cyflwyno-ch-ffurflen-dreth-hunanasesiad-ar-lein\">in Welsh (Cymraeg)</a>.</p>\n</div>\n\n<p>You can also use the online service to:</p>\n\n<ul>\n  <li>view returns you’ve made before</li>\n  <li>check your details</li>\n  <li>check how much you owe</li>\n  <li>print your tax calculation</li>\n  <li>sign up for paperless notifications</li>\n</ul>\n\n<h2 id=\"if-you-did-not-file-a-tax-return-last-year\">If you did not file a tax return last year</h2>\n\n<p>You must register for Self Assessment before using this service if you’re filing for the first time.</p>\n\n<p><a href=\"/register-for-self-assessment\">Check how to register for Self Assessment</a> to find out:</p>\n\n<ul>\n  <li>how to tell HMRC you need to complete a tax return for the first time</li>\n  <li>what to do if you’ve registered for Self Assessment before, to see if you need to reactivate your account</li>\n</ul>\n\n<div role=\"note\" aria-label=\"Information\" class=\"application-notice info-notice\">\n  <p>Your tax return may be delayed if you file it without reactivating an existing account.</p>\n</div>\n\n<h2 id=\"when-you-cannot-use-this-service\">When you cannot use this service</h2>\n\n<p>You cannot use this service to file your tax return online:</p>\n\n<ul>\n  <li>for a partnership</li>\n  <li>\n<a href=\"/trusts-taxes/trustees-tax-responsibilities/\">for a trust</a> or <a href=\"/self-assessment-tax-returns/returns-for-someone-who-has-died\">for an estate</a>\n</li>\n  <li>if you <a href=\"/tax-uk-income-live-abroad\">lived abroad as a non-resident</a>\n</li>\n  <li>to report multiple ‘<a href=\"/government/publications/gains-on-uk-life-insurance-policies-hs320-self-assessment-helpsheet\">chargeable event gains</a>’, for example from life insurance</li>\n  <li>if you get income from a trust, you’re a Lloyd’s underwriter or a religious minister</li>\n</ul>\n\n<p>Use <a href=\"/government/publications/self-assessment-commercial-software-suppliers\">commercial software</a> or <a href=\"/self-assessment-tax-return-forms\">download or request other forms</a> instead.</p>\n\n<div role=\"note\" aria-label=\"Information\" class=\"application-notice info-notice\">\n  <p>If you’re sending an SA100 tax return for the 2020 to 2021 tax year or earlier, <a rel=\"external\" href=\"https://webarchive.nationalarchives.gov.uk/ukgwa/20210406203547/https://www.gov.uk/government/publications/self-assessment-tax-return-sa100\">get forms from the National Archives</a>.</p>\n</div>\n\n<h2 id=\"sign-in-to-file-your-tax-return\">Sign in to file your tax return</h2>\n\n<p>You’ll need to sign in to use this service. If you do not already have sign in details, you’ll be able to create them.</p>\n\n<p>You’ll also need your <a href=\"/find-lost-utr-number\">Unique Taxpayer Reference (UTR) number</a>.</p>\n\n<p>You do not have to complete your return in one go. You can save your entry and go back to it later if you need to.</p>\n\n<p><a class=\"gem-c-button govuk-button govuk-button--start\" role=\"button\" data-module=\"govuk-button\" data-ga4-attributes='{\"event_name\":\"navigation\",\"type\":\"start button\"}' draggable=\"false\" href=\"https://www.tax.service.gov.uk/gg/sign-in?continue=/account/&amp;origin=SA-frontend\"><span> Sign in </span><svg class=\"govuk-button__start-icon govuk-!-display-none-print\" xmlns=\"http://www.w3.org/2000/svg\" width=\"17.5\" height=\"19\" viewbox=\"0 0 33 40\" focusable=\"false\" aria-hidden=\"true\"><path fill=\"currentColor\" d=\"M0 0h13l20 20-20 20H0l20-20z\"></path></svg></a></p>\n\n<h2 id=\"prove-your-identity-to-use-this-service\">Prove your identity to use this service</h2>\n\n<p>You’ll be told if you need to prove your identity when you sign in. This is to keep your details safe and usually involves using photo ID like a passport or driving licence.</p>\n","external_related_links":[]},"document_type":"answer","first_published_at":"2015-01-12T15:50:39+00:00","links":{"available_translations":[{"api_path":"/api/content/log-in-file-self-assessment-tax-return","api_url":"https://www.gov.uk/api/content/log-in-file-self-assessment-tax-return","base_path":"/log-in-file-self-assessment-tax-return","content_id":"6a2bf66e-2313-4204-afd5-9940de5e1d66","document_type":"answer","links":{},"locale":"en","public_updated_at":"2015-01-15T16:17:28Z","schema_name":"answer","title":"File your Self Assessment tax return 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