TITLE: How HMRC Uses Marketplace Data — And How to Keep Your Records Ready
HMRC’s access to third-party information is growing, making accurate, up-to-date records essential for your company. This guide explains how marketplace reporting and data-led compliance checks could affect you, and what to do now. Strong UK limited company accounting helps you reconcile sales, report VAT correctly and respond confidently if HMRC contacts you.
Understand what HMRC can compare
Under UK digital platform reporting rules, relevant platform operators collect and verify seller details and report information about sellers and transactions to HMRC. Information may also be exchanged with tax authorities in other jurisdictions under international arrangements. HMRC’s reporting guidance explains the rules and who they cover.
For online sellers, that information can provide a useful comparison with declared sales, VAT returns and company records. It does not mean every platform seller will automatically face an enquiry. But figures that cannot be explained, such as differences between platform activity, reported turnover and bank deposits, may lead HMRC to ask questions.
Be precise about which platforms are covered. Marketplaces that connect sellers with customers and handle or can determine payments may have reporting duties. A service that only processes payments does not automatically count as a reportable digital platform under these rules, although HMRC may receive information from third parties under other powers.
HMRC also uses data analytics and AI-supported tools to help identify compliance risks and select cases for further action. The precise matching methods and risk criteria are not public. The practical point is simple: keep your records ready to explain how each reported figure reconciles to your accounts.
Reconcile payouts before differences become problems
A marketplace payout is not the same as your sales turnover. It may already have refunds, fees, taxes or other deductions taken off. Record the underlying transactions, not just the amount reaching your bank.
Use this monthly checklist:
- Reconcile every platform payout. Match gross sales, refunds, platform and payment fees, and net deposits to the platform statement and bank account. Doing this monthly makes missing transactions easier to spot.
- Keep supporting documents. Retain platform statements, payout reports, VAT invoices, import records and customs paperwork. For corporation tax records, HMRC generally requires company records to be kept for six years from the end of the relevant accounting period. Check whether specific records have a different retention rule.
- Monitor the VAT threshold using taxable turnover, not net payouts. The UK threshold is £90,000. Track taxable turnover over each rolling 12-month period; do not wait for your year end. If you exceed the threshold on the backward-looking test, you generally have 30 days from the end of that month to register. A separate rule applies if you expect to exceed the threshold in the next 30 days. Check when you must register for VAT.
- Match VAT returns to transaction records. Make sure sales, refunds, marketplace-collected VAT and platform fees are recorded consistently. You must submit a return for every VAT period, even if there is no VAT to pay or reclaim. See HMRC’s guidance on sending a VAT Return.
- Check cross-border treatment. Confirm the VAT rate and place of supply for each type of sale. If you sell into the EU, review the relevant local VAT and One Stop Shop (OSS) obligations. For US sales, check whether your activities create sales tax registration and filing requirements.
- Review UK-held stock and fulfilment. If you are an overseas seller storing goods in the UK or fulfilling UK orders from UK stock, check whether you need UK VAT registration. The outcome depends on your business and transaction structure, including any marketplace VAT rules.
- Keep director transactions documented. Maintain clear director loan account entries, dividend paperwork and evidence of payments. Unexplained movements can create questions when HMRC reviews a company’s records.
- Respond to HMRC promptly. If you receive a nudge letter or compliance check letter, note the period and response deadline. Review the records, answer accurately and correct any errors, including through a disclosure where appropriate. Don’t ignore the letter; an unexplained delay can make the process harder.
For practical accounting services for small business UK, a regular reconciliation process is more useful than trying to rebuild the evidence at year end. A VAT automation tool can also help structure transaction data and identify discrepancies for review.
Worked example: why the £72,000 payout is not the turnover figure
Imagine a UK limited company selling through Amazon UK and eBay. Its monthly figures are excluding VAT:
| Monthly item | Amount |
|---|---|
| Gross marketplace sales | £84,000 |
| Refunds | (£3,000) |
| Platform and payment fees | (£9,000) |
| Cost of goods sold | (£31,000) |
| Fulfilment and shipping | (£12,000) |
| Other operating costs | (£6,000) |
| Net bank payouts | £72,000 |
The £72,000 payout is the cash left after £3,000 of refunds and £9,000 of fees. It does not show the full sales activity. The company should be able to reconcile the gross sales and deductions to platform reports, bank deposits and accounting entries.
For VAT: the £90,000 test uses taxable turnover over a rolling 12 months, not the net bank payout. Here, the £3,000 refunds need to be recorded and treated correctly; based on these figures, sales after refunds are £81,000 for the month, subject to the VAT treatment of the transactions. That one month does not settle the threshold question: add the company’s other taxable turnover across the relevant rolling period, and check the separate 30-day expectation test.
For corporation tax: a simplified accounting calculation is £81,000 sales after refunds, less £9,000 fees, £31,000 cost of goods, £12,000 fulfilment and shipping, and £6,000 other operating costs. That gives £23,000 profit before tax adjustments and any other income or expenses. Recording only the £72,000 payout as sales would obscure the separate income and expense figures and could distort the accounts.
For an enquiry file: keep the platform sales and refund reports, fee statements, payout breakdowns, bank statements, purchase invoices and shipping records together. This trail explains why reported sales, expenses and cash deposits differ, and makes it quicker to answer questions.
October compliance dates to keep in view
- 22 October: Electronic payment deadline for PAYE, National Insurance and CIS deductions for the month. Allow time for payment to reach HMRC.