Freelancer Tax Guide UK: Everything You Need to Know for 2025/26

Getting Started: Registering as a Freelancer

When you start freelancing in the UK, you must register with HMRC for Self Assessment. If you are operating as a sole trader (which most freelancers do initially), you need to register by 5 October following the end of the tax year in which you started freelancing. For example, if you started freelancing in September 2025, you must register by 5 October 2026. You can register online through the HMRC website, and you will receive a Unique Taxpayer Reference (UTR) number, usually within 10 working days.

Registering late does not just risk penalties — it also means you may not have enough time to gather your records and file your Self Assessment tax return by the deadline. If you have been freelancing for a while and have not yet registered, do it immediately. HMRC is increasingly effective at identifying unregistered taxpayers through data from banks, payment platforms, and other third parties.

Understanding Your Tax Obligations

As a freelancer, you are responsible for calculating and paying your own tax. Unlike employees, there is no employer to operate PAYE on your behalf. You must file a Self Assessment tax return each year and pay Income Tax on your profits (income minus allowable expenses). For the 2025/26 tax year, the rates are: 0% on the first £12,570 (your Personal Allowance), 20% on income from £12,571 to £50,270, 40% on income from £50,271 to £125,140, and 45% on income above £125,140.

In addition to Income Tax, you must pay National Insurance Contributions (NICs). Class 2 NICs are £3.45 per week (payable if profits exceed £12,570). Class 4 NICs are 6% on profits between £12,570 and £50,270, and 2% on profits above £50,270. Use our self-employment tax calculator to estimate your total tax bill for the current year.

Allowable Expenses: What Can You Claim?

One of the biggest advantages of being self-employed is the ability to deduct business expenses from your income before calculating tax. Allowable expenses must be incurred "wholly and exclusively" for business purposes. Common deductible expenses for freelancers include:

• Home office costs: A proportion of rent, mortgage interest, council tax, utilities, and broadband based on the number of rooms used for business, or use the simplified flat-rate method (£6 per week without evidence, or £26 per month)
• Equipment and software: Computers, monitors, keyboards, software subscriptions, and other tools needed for your work
• Travel: Business travel costs including train fares, mileage (45p per mile for the first 10,000 miles), and accommodation for overnight stays
• Professional development: Training courses, books, and subscriptions directly related to your current trade
• Professional fees: Accountancy fees, legal fees, and professional body memberships
• Insurance: Professional indemnity insurance, public liability insurance
• Marketing: Website hosting, advertising, business cards, and networking event costs
• Phone and internet: The business proportion of your mobile phone and broadband bills

The Trading Allowance

If your total self-employment income is £1,000 or less per year, you do not need to register as self-employed or report this income to HMRC — this is the trading allowance. If your income is above £1,000, you can choose to either deduct £1,000 as a flat-rate allowance instead of claiming actual expenses, or claim your actual business expenses. The trading allowance is useful if your expenses are minimal (for example, if you are a writer or consultant with very low overheads), but for most freelancers earning a meaningful income, claiming actual expenses will result in a lower tax bill.

Payments on Account

One of the most common surprises for new freelancers is the concept of payments on account. When you file your first Self Assessment return, HMRC will ask you to pay your tax bill for the year plus an advance payment towards next year's bill. This advance payment is 50% of the current year's liability, paid in two instalments: 31 January and 31 July. This means your first tax bill can effectively be 150% of what you expected.

For example, if your tax bill for 2025/26 is £6,000, you will pay £6,000 on 31 January 2027 plus a first payment on account of £3,000 — totalling £9,000. You will then pay a second payment on account of £3,000 on 31 July 2027. Plan for this by setting aside 25-30% of your income throughout the year. If your income drops significantly, you can apply to HMRC to reduce your payments on account, but be cautious — if you reduce them too much and your income does not fall as expected, you will face interest charges.

VAT: Do You Need to Register?

You must register for VAT if your taxable turnover exceeds £90,000 in any rolling 12-month period (the 2025/26 threshold). You can also register voluntarily below this threshold, which can be beneficial if most of your clients are VAT-registered businesses (they can reclaim the VAT you charge, so it does not increase their costs, while you can reclaim VAT on your own purchases). However, if your clients are mainly consumers or VAT-exempt organisations, voluntary registration will effectively increase your prices by 20%.

Read our detailed guide on when to register for VAT for a full analysis of the pros and cons. If you are approaching the threshold, it is essential to monitor your turnover carefully — late registration results in backdated VAT charges and penalties.

Sole Trader vs Limited Company

Most freelancers start as sole traders because it is simple, cheap, and involves minimal admin. However, as your income grows, operating through a limited company can become significantly more tax-efficient. The crossover point is typically around £30,000 to £35,000 in annual profit. Above this level, the combination of Corporation Tax (19-25%) and dividend tax is usually lower than Income Tax plus NICs as a sole trader.

A limited company also provides limited liability protection, which can be important if you work in areas where there is a risk of professional claims. The trade-off is additional administration — annual accounts, Corporation Tax returns, payroll, and Companies House filings — and higher accountancy fees. Our detailed comparison of sole trader vs limited company will help you decide which structure is right for your situation.

Record Keeping and Making Tax Digital

Good record keeping is not optional — it is a legal requirement. HMRC requires you to keep records of all your income and expenses for at least five years after the 31 January submission deadline for the relevant tax year. This includes invoices you issue, receipts for expenses, bank statements, and mileage logs. From April 2026, freelancers with income above £50,000 will also need to comply with Making Tax Digital for Income Tax, which requires digital record keeping and quarterly submissions to HMRC using compatible software. Cloud accounting tools like Xero, FreeAgent, or QuickBooks make this straightforward and will save you time at year-end.

Common Mistakes Freelancers Make

• Not setting money aside for tax: As a rule of thumb, set aside 25-30% of your income in a separate savings account. Do this with every payment you receive, not at the end of the year.
• Missing the Self Assessment deadline: The deadline for online returns is 31 January. Late filing triggers an automatic £100 penalty, with further penalties and interest for continued delay. Check our Self Assessment deadlines guide for all the key dates.
• Not claiming all allowable expenses: Many freelancers miss legitimate deductions, particularly home office costs, mileage, and professional subscriptions.
• Mixing personal and business finances: Open a separate bank account for your business — it makes bookkeeping much easier and provides a clear audit trail if HMRC investigates.
• Ignoring payments on account: These catch many freelancers off guard. Plan ahead and budget for them from day one.

How We Help London Freelancers

At London Accountants, we work with hundreds of freelancers across the capital — from IT contractors and consultants to designers, writers, and marketing professionals. Our tax planning service ensures you are structured in the most tax-efficient way, claiming every allowable expense, and paying only the tax you owe. We handle your Self Assessment, advise on the optimal time to incorporate, manage your VAT obligations, and provide year-round support so you can focus on what you do best. Get a quote today and see how much we can save you.