Running a website that earns through display ads can feel like a quiet side hustle until HMRC starts asking questions. Whether you run a blog, a niche tool, or a browser game, the money landing in your account from Google AdSense, Ezoic, Mediavine, or any other network is taxable income in the UK.
This guide explains how to keep your books in order, what HMRC expects you to report, and the practical decisions site owners need to make to stay compliant.
When Ad Income Becomes Taxable
Many site owners assume small amounts are ignored. HMRC sees it differently. If you earn over £1,000 a year from your site, the trading allowance no longer covers it and you need to register for Self Assessment.
A few quick rules to keep in mind:
- The £1,000 trading allowance applies to your gross income, not your profit
- Income is taxable in the tax year you earn it, not the year you withdraw it
- You owe tax whether the money sits in your AdSense balance or your bank account
- Running the site through a limited company changes the rules entirely
For example, if you run a small browser game like this color match game and it pulls in £150 a month from display ads, you are over the trading allowance and need to declare it.
Choosing the Right Structure
Before you worry about ledgers, decide how you operate. The structure shapes everything that follows.
Sole Trader
Most site owners start here. You report ad income on a Self Assessment return under self-employment. Profits are taxed at your marginal income tax rate plus Class 4 National Insurance.
Limited Company
Once profits grow, a limited company can be more tax efficient. The company pays corporation tax on profits, and you take income as a mix of salary and dividends. Our corporation tax services cover how to set this up.
Partnership
If you run the site with someone else, a partnership splits the income between you. Each partner reports their share on a Self Assessment return.
Recording Ad Revenue Correctly
Ad networks rarely make life simple. Payments arrive monthly, but earnings are reported daily, and most networks pay in US dollars even when you are UK based.
Income Recognition
Record ad revenue when it is earned, not when it is paid out. If you earned £400 in March but the payment lands in May, March is the correct month for your books. This is called the accruals basis and matters most for limited companies.
Sole traders under £150,000 turnover can use the cash basis, where you only record income when it hits your bank. This is simpler but less precise for forecasting.
Foreign Currency
AdSense pays in USD. HMRC requires you to convert ad income to GBP using a reasonable exchange rate. Practical options include:
- The rate on the day the payment lands
- The HMRC monthly average rate
- The Bank of England spot rate
Pick a method and stick with it. Switching mid-year invites questions during an investigation.
Multiple Networks
If you run several sites or use more than one ad network, keep a separate income line for each. This makes it easier to spot which sites are profitable and which are draining your time.
Allowable Expenses for Ad-Funded Sites
You only pay tax on profit, so claiming every legitimate expense matters. Common allowable costs for an ad-funded site include:
- Hosting and domain fees - your monthly hosting bill, SSL certificates, and domain renewals
- CDN and performance tools - services like Cloudflare or image optimisation tools
- Software subscriptions - analytics, SEO tools, design software
- Freelance costs - writers, designers, or developers you hire
- Home office costs - a fair share of your internet, electricity, and rent if you work from home
- Hardware - laptops, monitors, and equipment used for the business
- Professional fees - accounting, legal, and advisory costs
Keep digital receipts for everything. HMRC can ask for evidence going back six years.
VAT and Ad Revenue
This is where many site owners get caught out. Most major ad networks are based outside the UK. Google Ireland, for example, handles UK AdSense payments.
When you receive payments from an overseas ad network, the supply is outside the scope of UK VAT. You do not charge VAT on the income. However:
- The income still counts towards your VAT registration threshold (£90,000 from April 2024)
- You may need to register for VAT once your total taxable turnover crosses the threshold
- Once registered, you can reclaim VAT on UK expenses like hosting
Our VAT advice service helps website owners work out whether registration is needed and how to handle reverse charge rules on overseas software subscriptions.
Bookkeeping Setup for Site Owners
You do not need expensive software to keep good records, but a tidy system saves hours at year end.
Minimum Records to Keep
- A monthly summary of ad earnings from each network
- Bank statements showing the actual payouts
- Receipts for every expense claimed
- Mileage logs if you travel for the business
- Records of any equipment purchases over £100
Going Digital
Under Making Tax Digital, sole traders earning over £50,000 from April 2026 must keep digital records and submit quarterly updates. Cloud accounting software handles this neatly. We help clients set up Xero for ad-funded businesses, which connects directly to bank accounts and tracks foreign currency automatically.
If you would rather hand it over, our bookkeeping service takes care of monthly reconciliation, expense tracking, and quarterly reporting.
Reporting Ad Income to HMRC
The reporting route depends on your structure.
For Sole Traders
- Register for Self Assessment by 5 October after your first tax year of earnings
- File your return online by 31 January
- Pay any tax owed by 31 January, plus payments on account if your bill is over £1,000
For Limited Companies
- File a Company Tax Return (CT600) within 12 months of your year end
- Pay corporation tax within 9 months and 1 day of year end
- File annual accounts with Companies House
Our personal tax service covers Self Assessment for sole traders, while our accounting service handles the full company picture.
Common Mistakes to Avoid
A few patterns we see repeatedly with ad-funded site owners:
- Forgetting the trading allowance limit - small earnings still need declaring once you cross £1,000
- Using payout dates instead of earnings dates - this distorts profit between tax years
- Mixing personal and business bank accounts - opens you up to questions and missed expenses
- Ignoring foreign currency gains and losses - exchange rate moves create taxable amounts
- Not budgeting for tax - set aside 25 to 30 percent of profit until you know your real bill
When to Get Professional Help
If your site earns more than a few thousand pounds a year, professional advice usually pays for itself. The grey areas around VAT, currency, and structure are where most savings live.
At IAK Accountants, we work with website owners, app developers, and digital creators who earn through ads, affiliate links, and sponsorships. We can help you choose the right structure, set up clean books, and file everything on time.
Contact us for a chat about your site and what you are earning. We will tell you straight whether you need us yet, and if so, what the first steps look like.