Freelancer Tax Return Guide 2026-27

Tax Queen

Tax Expert @ Pie

6 min read

How to Complete a Freelancer Tax Return for 2026-27

A freelancer tax return is the Self Assessment return you send to HMRC each year to report your self-employed income, claim your business expenses and work out the tax and National Insurance you owe. For the 2026-27 tax year, which runs from 6 April 2026 to 5 April 2027, you file online and pay any tax due by 31 January 2028. Below we walk through each step, then put real numbers through a worked example.

If you want the bigger picture first, our guide on how to pay tax as a freelancer in the UK covers the basics. Here we focus on the return itself: what goes on it, how the sums work and the mistakes that catch people out.

Who Needs to File and When

You need to file if you earned more than £1,000 from self-employment in the tax year. That £1,000 is the trading allowance, a tax-free amount for small side earnings. If your gross freelance income (everything you were paid before expenses) stayed at or below it, and you have no other reason to file, you usually do not need to register.

Not every freelancer is self-employed for tax purposes. If an agency pays you through payroll, tax may already be taken at source. Our guide to umbrella companies for freelancers and contractors explains how that differs from working as a sole trader.

The Key Dates for 2026-27

If you started freelancing in 2026-27, register for Self Assessment by 5 October 2027. HMRC will send your Unique Taxpayer Reference (UTR), a 10-digit number that identifies you. Paper returns are due by 31 October 2027 and online returns by 31 January 2028, which is also when your tax is due. A second payment on account, if one applies, follows on 31 July 2028. File late and you face an automatic £100 penalty, even if you owe nothing.

Step-By-Step: Filing Your Return

Step 1: Register and Gather Your Records

Register as self-employed on GOV.UK and set up your HMRC online account. While you wait for your UTR, pull together every invoice and payment for the tax year. Sole traders are taxed on profits made in the tax year itself, so a 31 March or 5 April year end keeps things simple. The cash basis, where you count income when received and expenses when paid, is the default for sole traders and is what we use below. If you are choosing a record-keeping tool, our look at the top freelancer accounting software for 2025 covers what to look for.

Step 2: Total Up Your Allowable Expenses

Allowable expenses are costs incurred wholly and exclusively for your business, such as software, equipment, business travel, professional insurance and the business share of your phone and broadband. Personal costs, client entertaining and commuting to a regular workplace do not count.

For working from home, you can claim a flat £10 a month for 25 to 50 hours, £18 for 51 to 100 hours and £26 for 101 hours or more. Business mileage in your own car is 45p a mile for the first 10,000 miles and 25p after that. You can deduct the £1,000 trading allowance instead of actual expenses, but not both. Logging costs as you go makes this step easy, so it is worth seeing how self-assessment software pulls in income and sorts expenses for you.

Step 3: Complete the Self-Employment Pages and Submit

Online, the self-employment section mirrors the SA103S short pages, for turnover under £90,000, or the SA103F full pages. Enter your turnover and expenses and the system works out your profit. Then add any other income, such as wages, rent or savings interest, plus Gift Aid and pension contributions. Higher rate taxpayers should claim extra pension relief here, as our pension tips for freelancers explain. Check the calculation and submit.

A Worked Example for 2026-27

Sam is a freelance graphic designer with no other income. In 2026-27, Sam receives £48,000 from clients. It is Sam's first full year, so there are no earlier payments on account to deduct.

Working Out Taxable Profit

Sam spends £600 on software, £1,200 on a laptop, £540 on the business share of phone and broadband, £216 on working from home (£18 a month for 12 months), £900 on mileage (2,000 miles at 45p), £300 on insurance, £1,500 on a co-working desk and £744 on a website and marketing. That totals £6,000, leaving a taxable profit of £42,000.

Calculating Income Tax

For 2026-27, the Personal Allowance, the income you can earn tax-free, is £12,570. Income above that up to £50,270 is taxed at 20%, then 40%, with 45% over £125,140. Sam's £42,000 minus £12,570 leaves £29,430, all at the basic rate, giving £5,886 of income tax.

Calculating Class 4 National Insurance

Class 4 National Insurance is 6% on profits between £12,570 and £50,270, and 2% above that. Sam pays 6% on £29,430, which is £1,765.80. Class 2 is no longer compulsory, and at this profit level Sam's State Pension record is protected automatically. Sam's total bill is £7,651.80.

Payments on Account

Payments on account are advance payments towards next year's bill, each half of this year's. They apply when your bill is £1,000 or more, unless at least 80% of your tax is already collected at source. On 31 January 2028, Sam pays £7,651.80 plus a first payment on account of £3,825.90, a total of £11,477.70. Another £3,825.90 is due on 31 July 2028.

That first January surprises many new freelancers. Setting aside a quarter to a third of each payment helps, and it is one of the reasons freelancers choose software that shows their tax bill as they go.

Where Making Tax Digital Fits In

Making Tax Digital for Income Tax (MTD) has applied since 6 April 2026 to sole traders and landlords with qualifying income over £50,000, meaning gross self-employment and property income before expenses. The threshold falls to £30,000 from April 2027. Those in MTD keep digital records and send 4 quarterly updates a year using MTD software, then make a final declaration by 31 January after the year ends. Tax rates and payment dates stay the same.

Sam's £48,000 is below £50,000, so a normal return works for 2026-27, but the lower threshold means MTD is likely to apply to Sam soon. For wider policy changes, see our article on Labour's tax shake-up and what freelancers must know.

Common Mistakes to Avoid

The most common is under-claiming expenses, especially subscriptions, bank charges and the business share of household bills. Every £100 missed costs a basic rate taxpayer £26 once Class 4 National Insurance is included. Next is leaving it until January: filing in summer does not mean paying early, but it shows your bill months ahead. Finally, use a separate bank account for freelance money and keep records for at least 5 years after the 31 January deadline.

What to Do Now

Check which deadlines apply to you and whether your income puts you inside MTD. Then gather your 2026-27 invoices and receipts and run your own numbers through the steps Sam followed, so you know what to set aside.

If you would rather skip the manual sums, Pie Tax is self-assessment software for sole traders, landlords and freelancers that pulls in your income, sorts your allowable expenses and handles both Self Assessment and Making Tax Digital, so your return is ready well before January. When you want to see your own figures, you can sign in or try it for free and make a start today.