Selling through online marketplaces such as Amazon, eBay, Etsy and Vinted generates income that HMRC tracks through platform reporting rules effective from January 2024. Sole traders, limited companies and casual sellers all face specific tax obligations once sales pass defined thresholds. This UK business guide explains the rules, deadlines and reporting requirements that apply to marketplace sellers, plus the records HMRC expects you to keep.
What Is Paying Tax When You Sell Through Online Marketplaces?
Paying tax when you sell through online marketplaces is the obligation to declare income earned through digital platforms such as Amazon, eBay, Etsy, Vinted, Uber and Airbnb to HMRC, then pay Income Tax, Corporation Tax or VAT on the profits according to your business structure.
The tax obligation itself is not new. What changed in January 2024 is reporting. Under rules aligned with the international DAC7 framework, marketplace operators must now send HMRC detailed data on seller activity, including sales volumes, transaction counts and linked bank details. HMRC uses this data to cross-check against Self Assessment returns.
Three thresholds define the scope of the rules.
| Threshold | Limit (2024/25) | Effect on sellers |
|---|---|---|
| Trading allowance | £1,000 gross per tax year | No tax, no declaration required |
| Self Assessment | Above £1,000 gross | Must register and file |
| VAT registration | £90,000 turnover | Mandatory VAT registration |
HMRC confirmed in 2023 guidance that the EU-style 30-item sales threshold does not apply in the UK. Sellers should ignore claims that selling 30 items triggers automatic tax liability.
Why Does This Matter for Your UK Business?
The reporting matters because HMRC now receives seller data directly from platforms. Cross-checking against declared income is automated. Gaps between platform-reported sales and Self Assessment figures trigger compliance reviews, estimated assessments and penalties.
A UK business selling on Amazon, eBay or Etsy faces four specific risks if income goes undeclared.
- Late filing penalties starting at £100
- Surcharges of up to 100% of tax due for deliberate non-disclosure
- Interest on unpaid tax from the original due date
- Investigation costs averaging £3,000 to £5,000 in professional fees per case
For limited companies, undeclared marketplace income also affects Company Accounts filed at Companies House. Discrepancies between Companies House filings and HMRC returns create additional exposure.
Casual sellers face the same rules. Selling unwanted personal items at a loss does not create a tax liability. Selling goods bought for resale, even occasionally, counts as trading once turnover exceeds £1,000.
What Are the Key Rules and Requirements?
Six rules govern marketplace tax compliance in the UK.
1. Apply the £1,000 trading allowance
HMRC grants a £1,000 trading allowance per tax year. Gross income from all trading activities below £1,000 requires no declaration and no tax. Income above £1,000 must be declared in full, with the allowance deducted from gross income rather than net profit.
2. Register for Self Assessment by 5 October
Sole traders and partners must register for Self Assessment by 5 October following the tax year in which income exceeds £1,000. Registration is completed through the HMRC online service and triggers a Unique Taxpayer Reference.
3. Keep records for five years
Records of sales, expenses, fees and platform statements must be retained for five years after the 31 January submission deadline. Digital records satisfy HMRC requirements if they show transaction dates, amounts, buyer identifiers and marketplace fees.
4. Monitor the VAT threshold
VAT registration becomes mandatory when taxable turnover exceeds £90,000 in any rolling 12-month period. Since 2021, online marketplaces collect and account for VAT on certain cross-border and non-UK seller transactions. UK sellers remain responsible for domestic VAT obligations. Our VAT Services page details registration and compliance requirements.
5. Pay Corporation Tax on limited company profits
Limited companies pay Corporation Tax at 19% on profits up to £50,000 and 25% on profits above £250,000, with marginal relief between the two bands. Marketplace sales form part of company turnover and must appear in Corporation Tax returns. Companies trading through marketplaces need registered business addresses and proper accounting periods.
6. File returns on time
Self Assessment returns are due by 31 January following the tax year end. Online filing, payment of tax due and any balancing payments must reach HMRC by midnight on the deadline. Limited companies file Tax Returns / Taxation returns separately within 12 months of the accounting period end.
What Common Questions Do Marketplace Sellers Ask?
Do I Pay Tax on Personal Items I Sell Online?
No tax applies to personal items sold for less than their original purchase price. Capital Gains Tax may apply to personal possessions sold for more than £6,000 in a single transaction, with rates of 10% or 20% depending on your Income Tax band. Our Tax Returns / Taxation service covers both Income Tax and Capital Gains Tax filings.
When Do I Need to Register for Self Assessment?
Register by 5 October after the tax year in which your gross trading income first exceeds £1,000. Income crossing the threshold in the 2024/25 tax year requires registration by 5 October 2025. Late registration incurs penalties.
How Long Must I Keep Marketplace Sales Records?
Keep records for five years after the 31 January Self Assessment deadline. HMRC can request platform statements, bank statements and expense receipts during this period. Digital copies stored in cloud accounting software satisfy the requirement. Our Bookkeeping Services team sets up compliant record systems for marketplace sellers.
Does the 30-Item Rule Apply in the UK?
No. The 30-item threshold originates from EU DAC7 rules. HMRC removed this threshold for UK reporting. Sellers are taxed on income, not on the number of transactions. This is one of the most common accounting tips UK sellers request clarification on.
Should I Trade as a Limited Company or Sole Trader?
Structure depends on profit level, liability appetite and tax efficiency. Limited companies offer liability protection and lower rates above certain profit levels, but require Limited Company Formations and ongoing compliance. Sole traders face simpler reporting but higher personal tax rates on profits above £50,270.
How Can an Accountant Help with Marketplace Tax?
A Chartered Accountant provides four specific services for marketplace sellers seeking small business advice.
First, registration and structure. We confirm whether sole trader or limited company status delivers better tax outcomes, then handle HMRC and Companies House registrations.
Second, record systems. We configure cloud accounting software to import platform data automatically, ensuring every sale, fee and refund is captured. Accurate records reduce tax by claiming every legitimate expense.
Third, returns and compliance. We prepare Self Assessment, VAT and Corporation Tax returns, file them on time, and liaise with HMRC on your behalf. Late filings and missed deadlines are eliminated.
Fourth, advisory. We review pricing, fees and margins to improve profitability. Quarterly reviews catch issues before they become penalties.
Aqua Accounting is an ICAEW Registered Member Firm based in Newcastle upon Tyne, with 13+ years serving North East businesses. Our Business Accounting Advisory service supports marketplace sellers at every stage, from first sale to multi-channel growth.
Contact Aqua Accounting today to arrange a consultation with an ICAEW Chartered Accountant. Call our Newcastle office or complete the enquiry form to book a 30-minute review of your marketplace sales and tax position.
Disclaimer:
The information provided in this blog is for general informational purposes only and does not constitute professional advice. While every effort is made to ensure accuracy, Aqua Accounting accepts no responsibility for any actions taken based on this content. You should seek professional advice tailored to your individual circumstances.
Omar Ahmed is an ICAEW Chartered Accountant and the Director of Aqua Accounting, a UK-based accountancy practice providing expert accounting and tax services to individuals, sole traders, and small to medium-sized businesses. As a trusted accountant in Newcastle, he offers expertise in annual accounts, self-assessment tax returns, company accounts, VAT, payroll, bookkeeping, and company formation.
With a strong focus on delivering clear and practical financial advice, Omar helps clients stay compliant while improving their understanding of their finances. Through Aqua Accounting, he works closely with business owners to simplify accounting processes, meet tax obligations, and support informed financial decision-making.