How to Submit Your Tax Return Online

Updated November 2025

Submitting your tax return online is often the quickest way to get it done, but knowing which steps to take — and which documents you’ll need — can save a lot of stress. Below is a clear walkthrough of the full process.

Step 1: Set Up Your Government Gateway Account

To file your tax return online, you’ll need a Government Gateway account. HMRC uses this as your secure login. You can create an account using your National Insurance number and basic ID information.

HMRC may ask you to verify your identity using a passport, driving licence, or other approved method.

Step 2: Gather Your Financial Records

You’ll need the following to complete your return:

All income records (self-employed income, employment income, rental income etc.)
Business expenses and receipts
P60s, P45s, or P11Ds if employed
Interest, dividends, or investment income statements
Gift Aid donations

Missing documents can cause delays, so it’s worth gathering them beforehand.

Step 3: Log In to HMRC’s Online Service

Once your account is set up, log in at gov.uk using your Government Gateway credentials. From your dashboard, select 'Self Assessment' and then choose‘Complete your tax return’.

Step 4: Complete Each Section of the Return

HMRC will guide you through each section of the return. You’ll be asked for details on:

Personal Information:Confirm and update personal information, such as your address and contact details.
Income:
DeductionsInclude any allowable deductions, such as business expenses, if you’re self-employed, or pension contributions.

Step 5: Review and Double-Check

Before submitting, review each section carefully. Mistakes can lead to delays or corrections from HMRC. Make sure figures match your documents exactly.

Step 6: Submit and Pay

Once you’re satisfied everything is correct, submit your tax return. HMRC will provide a confirmation and calculate your tax owed or any refund due. Note your payment deadline to avoid penalties.

Step 7: Keep a Copy for Your Records

After submission, download or print a copy of your tax return for your records. HMRC keeps your online records, but it’s helpful to have your own copy.

Need help finding your SA302 or Tax Year Overview? SA302 guide · Tax Year Overview guide

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YOUR HOME MAY BE REPOSSESSED IF YOU DO NOT KEEP UP REPAYMENTS ON YOUR MORTGAGE OR ANY OTHER DEBT SECURED ON IT.

IMPORTANT: With investments, your capital is at risk. Pensions and investments can go down in value as well as up, so you could get back less than you invest.

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