Freelancing in the UK means you are running a business, whether you think of yourself that way or not. HMRC certainly does. As a sole trader (the default structure for most freelancers), you are personally responsible for keeping records, calculating your tax and filing a Self Assessment return each year.
Getting the basics right from the start prevents headaches later and ensures you are not paying more tax than you need to.
Setting up correctly
Register with HMRC
You must register as self-employed with HMRC by 5 October in your second tax year of trading. For example, if you start freelancing in August, you normally register by 5 October after that tax year ends.
In practice, register as soon as you start. Late registration can result in penalties, and you will need your Unique Taxpayer Reference (UTR) to file your Self Assessment return.
Choose your business structure
Most freelancers start as a sole trader because it is the simplest option. You can also operate through a limited company, which offers some tax advantages but adds administrative overhead.
| Factor | Sole trader | Limited company |
|---|---|---|
| Setup | Register with HMRC (free) | Register at Companies House (£12 online) |
| Tax filing | Self Assessment return | Corporation Tax return + personal tax return |
| Tax rates | Income Tax (20/40/45%) + Class 4 NIC | Corporation Tax (19-25%) + dividend tax |
| Personal liability | Unlimited | Limited to company assets |
| Admin burden | Lower | Higher (annual accounts, confirmation statement) |
| IR35 considerations | Not applicable | Relevant for contractor work |
For most freelancers earning under £50,000, the sole trader structure is simpler and the tax difference is marginal. Once your profits regularly exceed this, it is worth getting advice on whether incorporating would save you money.
Open a separate bank account
You are not legally required to have a separate business bank account as a sole trader, but it is strongly recommended. Mixing personal and business transactions makes bookkeeping harder, increases the risk of errors and creates problems if HMRC ever enquires into your records.
Many UK banks offer free business current accounts for sole traders, including Starling, Monzo Business and Tide.
What records to keep
HMRC requires you to keep records of:
- All sales and income (invoices, cash received, bank transfers)
- All business expenses (receipts, bank statements, credit card statements)
- VAT records (if VAT-registered)
- Mileage logs (if claiming vehicle expenses)
You must keep these records for at least 5 years after the 31 January submission deadline for the relevant tax year.
Digital records
Since April 2022, if you are VAT-registered, you must keep digital records under Making Tax Digital. Even if you are below the VAT threshold, using accounting software to keep your records digitally saves time and reduces errors.
Allowable expenses
Claiming every legitimate business expense reduces your taxable profit and therefore your tax bill. Here are the main categories:
Home office costs
If you work from home, you can claim a proportion of your household costs:
Simplified method (flat rate):
| Hours worked from home per month | Monthly flat rate deduction |
|---|---|
| 25 to 50 hours | £10 |
| 51 to 100 hours | £18 |
| 101+ hours | £26 |
Actual cost method: Calculate the proportion of your home used for business and claim that percentage of:
- Rent or mortgage interest
- Council tax
- Electricity, gas and water
- Home insurance
- Internet and phone (business proportion)
The flat rate is simpler but usually gives a smaller deduction. If you have a dedicated home office, the actual cost method typically saves more.
Travel and vehicle costs
You can claim for business travel, but not for commuting (travel between home and a regular place of work).
For your own vehicle:
| Miles | Rate per mile |
|---|---|
| First 10,000 business miles | 55p |
| Each mile over 10,000 | 25p |
Alternatively, claim actual running costs (fuel, insurance, repairs, road tax) proportional to business use. You cannot switch between methods year to year for the same vehicle.
Other travel expenses:
- Train and bus fares for business trips
- Flights for client meetings
- Taxis
- Hotel accommodation for business trips
- Subsistence (meals while travelling on business)
Professional costs
- Professional indemnity insurance
- Accountancy fees
- Professional subscriptions (industry bodies, trade associations)
- Training courses directly related to your current work (not courses to enter a new field)
Equipment and technology
- Computer equipment (laptops, monitors, keyboards)
- Software subscriptions (design tools, project management, accounting software)
- Office furniture (desk, chair)
- Phone (business proportion of contract cost)
If an item costs less than the Annual Investment Allowance threshold and is used wholly for business, you can deduct the full cost in the year of purchase. If it has mixed personal and business use, claim the business proportion.
Marketing and business development
- Website hosting and domain names
- Advertising (Google Ads, social media ads)
- Business cards and stationery
- Portfolio website costs
Financial costs
- Bank charges on your business account
- Interest on business loans
- Credit card fees (business proportion)
- Bad debts (invoices you have genuinely been unable to collect)
Self Assessment filing
Key dates
| Deadline | What |
|---|---|
| 5 April | Tax year ends |
| 31 July | Second payment on account due |
| 5 October | Deadline to register for Self Assessment (first year) |
| 31 October | Paper return deadline |
| 31 January | Online return deadline and balancing payment due |
| 31 January | First payment on account for next year due |
Payments on account
If your tax bill is over £1,000, HMRC requires you to make payments on account – advance payments towards next year’s tax bill. Each payment is 50% of the previous year’s tax liability, due on:
- 31 January (during the tax year)
- 31 July (after the tax year ends)
Any remaining balance (or overpayment) is settled with the balancing payment on the following 31 January.
This catches many new freelancers off guard. In your second year, you could face a bill for the full previous year’s tax plus 50% of next year’s estimated tax – effectively 150% of a normal year’s tax in one go.
What goes on your return
Your Self Assessment return includes:
- Turnover (total income from freelancing before expenses)
- Allowable expenses (broken down by category)
- Net profit (turnover minus expenses)
- Any other income (employment, savings interest, rental income, dividends)
- Capital gains (if you sold assets at a profit)
- Student loan repayments (if applicable)
VAT for freelancers
When to register
You must register for VAT if your taxable turnover exceeds £90,000 in any rolling 12-month period. You can also register voluntarily below this threshold.
Should you register voluntarily?
| Situation | Voluntary registration? |
|---|---|
| Most clients are VAT-registered businesses | Often yes – they can reclaim the VAT you charge |
| Most clients are consumers | Usually no – your prices effectively increase by 20% |
| You have significant input VAT (expenses with VAT) | Possibly – you can reclaim this VAT |
| Your turnover is well below £90,000 | Probably not worth the admin unless other factors apply |
If you do register, the Flat Rate Scheme can simplify your VAT accounting. You charge VAT at the standard rate but pay HMRC a lower fixed percentage of your gross turnover. The percentage depends on your business sector. For more detail, see our guide to VAT.
National Insurance
As a sole trader, you pay two types of National Insurance:
| Class | How it works |
|---|---|
| Class 4 | Charged on profits above the lower profits limit: a main rate up to the upper profits limit and a lower additional rate above it |
| Class 2 | Not compulsory since 6 April 2024; treated as paid when profits reach the small profits threshold, and can be paid voluntarily below it to protect your State Pension |
Class 4 is calculated on your Self Assessment return. HMRC publishes the current rates, limits and thresholds on GOV.UK.
Tax-efficient strategies
Use your personal allowance
The personal allowance is the amount of income you can receive each tax year before Income Tax starts. If you have no other income, make sure you are using it fully, for example by timing income or sharing it with a spouse who genuinely works in the business.
Pension contributions
Contributions to a personal pension reduce your taxable income. As a sole trader, you get tax relief on contributions up to 100% of your earnings, capped by the pension annual allowance.
If you are a basic rate taxpayer, the pension provider claims 20% tax relief automatically. If you are a higher rate taxpayer, you claim the additional relief through your Self Assessment return.
Timing your income and expenses
If you are close to a tax band threshold, you can sometimes manage your timing to stay in the lower band:
- Delay invoicing a December project until January (next tax year)
- Bring forward planned equipment purchases to increase expenses in the current year
- Prepay annual subscriptions before the tax year ends
This is legitimate tax planning, not evasion. But be careful not to distort your accounts artificially.
Common mistakes freelancers make
- Not setting aside money for tax – put 25-30% of every payment into a separate savings account
- Missing the payments on account system – budget for the January and July payments
- Forgetting to claim expenses – keep every receipt and log every business mile
- Mixing personal and business finances – use a separate bank account
- Not registering for VAT on time – monitor your rolling 12-month turnover
- Keeping paper records only – use digital tools to make your life easier and prepare for MTD
Getting your tools right
As a freelancer, your accounting does not need to be complicated, but it does need to be accurate and complete. Using accounting software designed for UK sole traders and small businesses automates the tedious parts – bank feed categorisation, VAT calculations, expense tracking – so you can focus on the work that earns you money.