How to Register for Self Assessment as a UK Freelancer — Step by Step (2026)

If you have started freelancing — or earning any self-employed income above £1,000 in a tax year — you are required to register for Self Assessment with HMRC. It is not complicated, but there are specific deadlines and a few things worth knowing before you start.

This guide walks through the full process, from first registration to receiving your UTR number and filing your first return.

Do you need to register?

You need to register for Self Assessment if any of the following apply:

• Your self-employed income was more than £1,000 in a tax year (after the trading allowance)
• You have income from renting out property
• You earn money from savings, investments, or dividends above the tax-free allowances
• You are a company director
• You have income from abroad
• HMRC sends you a notice to complete a return

The £1,000 threshold is your gross income, not profit. If you made £1,500 selling services online, even if you spent £1,200 on costs, you are above the threshold and need to register.

When is the registration deadline?

You must register by 5 October following the end of the tax year in which you started freelancing.

The UK tax year runs from 6 April to 5 April. So:

• Started freelancing between 6 April 2025 and 5 April 2026 → register by 5 October 2026
• Started freelancing between 6 April 2024 and 5 April 2025 → should have registered by 5 October 2025

Step 1: Create a Government Gateway account

If you do not already have a Government Gateway account, go to gov.uk and create one. You will need:

• Your National Insurance number
• A valid UK address
• An email address
• A form of ID (passport or driving licence)

If you already have a Government Gateway account — for example, from checking a tax code or claiming Child Benefit — use that one. Do not create a new one.

Step 2: Register as self-employed

Once you have a Government Gateway account, go to gov.uk/register-for-self-assessment, select the appropriate option, and follow the prompts. You will need to provide:

• The date you started trading
• Your business type (most freelancers select sole trader)
• A brief description of your business
• Your National Insurance number

The online process takes about 10 minutes.

Step 3: Receive your UTR number

After registering, HMRC will send your Unique Taxpayer Reference (UTR) to your address by post within 7–21 days (longer if you are abroad). Your UTR is a 10-digit number used on every tax return you ever file. Keep it safe — you can retrieve it from your HMRC online account or by contacting HMRC directly if you lose it.

Step 4: Set up your accounting records

Once registered, start keeping digital records of all your income and expenses. HMRC requires you to keep records for at least five years after the relevant tax year.

This is also the right moment to choose accounting software — particularly important if you will be affected by Making Tax Digital for Income Tax. MTD requires digital record keeping and quarterly submissions to HMRC from April 2026 for sole traders earning over £50,000. Check whether MTD applies to you with our free eligibility tool.

When is your first tax return due?

Your first Self Assessment return covers the tax year in which you started freelancing. The filing deadlines are:

• Online: 31 January following the end of the tax year
• Paper: 31 October following the end of the tax year

For example: if you started freelancing in July 2025, your first return covers the 2025–26 tax year (6 April 2025 to 5 April 2026) and is due by 31 January 2027 online.

What about payment on account?

Once you owe more than £1,000 in tax for a year, HMRC requires two advance payments toward the following year's bill. These are called payments on account:

• First payment: 31 January (same day as your Self Assessment return)
• Second payment: 31 July

Each payment is 50% of your previous year's tax bill.

What if you have been freelancing without registering?

Register immediately. HMRC can issue penalties for late registration, but the amount depends on how much tax was unpaid and whether the failure was deliberate. In most cases, registering late voluntarily results in significantly reduced penalties compared to HMRC discovering the omission. Do not wait.