{"id":597,"date":"2025-09-17T06:00:00","date_gmt":"2025-09-17T06:00:00","guid":{"rendered":"https:\/\/tax2u.co.uk\/blog\/?p=597"},"modified":"2025-09-12T10:41:06","modified_gmt":"2025-09-12T10:41:06","slug":"step-by-step-guide-to-filing-your-first-self-assessment","status":"publish","type":"post","link":"https:\/\/tax2u.co.uk\/blog\/2025\/09\/17\/step-by-step-guide-to-filing-your-first-self-assessment\/","title":{"rendered":"Step-by-step guide to filing your first self assessment"},"content":{"rendered":"\n

If you\u2019re self-employed, a sole trader, or earning income outside PAYE, you\u2019ll need to complete a Self Assessment tax return. Many people search for how to file self assessment tax return<\/a><\/em> because the process feels overwhelming at first. The good news is, once you understand the steps, it becomes much easier to manage. This guide will walk you through your first Self Assessment in plain English.<\/p>\n\n\n\n

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What is a self assessment tax return?<\/h2>\n\n\n\n
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A Self Assessment tax return is HMRC\u2019s way of collecting Income Tax from people who don\u2019t have it deducted automatically through PAYE. That includes self-employed workers, CIS subcontractors, landlords, and even those with dividends or side hustles. Filing one means telling HMRC about your income and expenses for the tax year, then paying the right amount of tax and National Insurance.<\/p>\n\n\n\n

For a more detailed breakdown of who needs to file, check out our Self Assessment tax return guide<\/a>.<\/p>\n\n\n\n

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Step 1: Register with HMRC<\/h2>\n\n\n\n
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Before you can file, you need to register with HMRC for Self Assessment. Once registered, you\u2019ll get a Unique Taxpayer Reference (UTR) number. This can take a couple of weeks to arrive, so don\u2019t leave it until the last minute.<\/p>\n\n\n\n

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Step 2: Gather your records<\/h2>\n\n\n\n
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HMRC expects accurate figures. Collect your invoices, receipts, bank statements, P60s (if you had PAYE work), and any CIS deduction statements if you\u2019re a subcontractor. Keeping things organised makes the actual filing process much smoother.<\/p>\n\n\n\n

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Step 3: Fill in your return<\/h2>\n\n\n\n
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You can file online through HMRC\u2019s website or use an accountant. The online system guides you through sections, but you\u2019ll need to know which apply to you – self-employment pages, property income, capital gains, and so on.<\/p>\n\n\n\n

If this is your first self assessment guide<\/em>, remember:<\/p>\n\n\n\n