What is the threshold for HMRC platform reporting?

Platforms must report UK sellers who complete 30 or more transactions OR generate €2,000 or more in gross merchandise value in a calendar year. If you meet either threshold on any one platform, that platform reports your sales data, fees, and transaction count to HMRC by 31 January the following year. The thresholds apply per platform per calendar year, so selling £1,500 on eBay and £1,500 on Etsy would not trigger reporting on either platform individually.

Do I still need to declare platform sales on my tax return if the platform already reported them to HMRC?

Yes. Platform reporting is an information-sharing mechanism, not a withholding tax. You remain responsible for declaring all income on your Self Assessment or corporation tax return. HMRC uses the platform data to cross-check your declared turnover. If your return shows materially lower revenue than the platform reported, HMRC will open a compliance check and may assess underpaid tax, interest, and penalties.

What should I do if the platform-reported figure does not match my accounting records?

Document the reconciliation with a line-by-line breakdown: platform GMV, refunds, currency conversion differences, and any timing differences (e.g. December sales settled in January). Attach the reconciliation as a note in your tax return or keep it with your records. Small variances under 1% of turnover are typically immaterial. Variances above £1,000 or 5% of turnover should be explained to your accountant before filing to pre-empt HMRC queries.

Does platform reporting apply to hobby sellers or only registered businesses?

Platform reporting applies to all sellers who meet the transaction or revenue threshold, regardless of whether you are a registered sole trader, limited company, or selling as a hobby. HMRC expects you to declare the income under the Trading Allowance (£1,000 per year tax-free for casual income) or as self-employment income if turnover exceeds the allowance. Registration with HMRC as self-employed is required if your profit exceeds the Trading Allowance in a tax year.

When does HMRC receive platform data and how long do I have to reconcile?

Platforms submit calendar-year data to HMRC by 31 January each year. HMRC typically makes the data available to sellers via their online tax account by late February. You must file your Self Assessment for the same tax year by the following 31 January (for paper) or online deadline. For example, 2024 calendar-year platform data reported by 31 January 2025 must be reconciled and declared on your 2024/25 Self Assessment due 31 January 2026. For limited companies, corporation tax returns are due 12 months after your accounting period end.

HMRC Platform Reporting: What Online Sellers Must Reconcile

HMRC receives sales data directly from digital platforms under the OECD's Model Reporting Rules for Digital Platforms, implemented in UK law from 1 January 2024. Platforms including Amazon, eBay, Etsy, Vinted, and Airbnb report seller revenue, fees, and transaction counts to HMRC by 31 January each year for the prior calendar year. This data covers any UK seller who exceeded specific thresholds: 30 transactions OR €2,000 in gross merchandise value in a calendar year. If you sold through a platform in 2024, HMRC already has your numbers — your job is to reconcile what they received against what you declare on your Self Assessment or corporation tax return.

This is not a new tax. Platform reporting is an information-sharing mechanism designed to close the tax gap on undeclared platform income. The reporting obligation sits with the platform operator, not the seller, but the seller must ensure their declared turnover matches the platform's submission. Mismatches trigger compliance checks, and from April 2026 the interaction with Making Tax Digital for Income Tax Self Assessment means quarterly reconciliation becomes mandatory for sole traders and partnerships earning above £50,000 qualifying income.

Which platforms report to HMRC and what data they send

For related context, see our Shopify and D2C ecommerce accounting guide.

Any platform facilitating sales of goods or services between third-party sellers and buyers must report under the rules. This includes marketplaces (Amazon, eBay, Etsy, Fruugo, OnBuy), rental platforms (Airbnb, Vrbo), peer-to-peer resale apps (Vinted, Depop), freelance marketplaces (Fiverr, Upwork), and ride-hailing or delivery platforms (Uber, Deliveroo). The platform reports your total gross merchandise value (the sale price paid by the customer, excluding marketplace fees), the number of transactions, your registered business name or trading name, your National Insurance number or UTR, and your bank account details on file.

Platforms do not deduct tax at source. They report the raw transaction data to HMRC, which HMRC then matches against your tax return using your NI number or UTR. If your declared turnover is materially lower than the platform's report, HMRC opens a compliance check. The threshold for reporting is 30 transactions OR €2,000 gross sales in a calendar year. If you meet either threshold on any one platform, that platform reports. Multiple platforms each file separately — HMRC aggregates the data across all platforms linked to your taxpayer reference.

What happens if you sell across multiple platforms

Each platform reports independently. If you sell on Amazon UK, eBay, and Etsy, HMRC receives three separate submissions, each tagged to your UTR or NI number. Your declared turnover on your tax return must equal the sum of all platform-reported gross sales plus any direct sales (your own website, wholesale, in-person) not captured by platform reporting. We see founders understate turnover because they reconcile against only one platform's settlement file or forget direct Shopify sales that did not touch a marketplace. Build a master reconciliation that lists every sales channel, the gross revenue per channel, and the HMRC-reported figure where applicable.

Reconciling platform-reported figures against your accounting records

The platform reports gross merchandise value in the customer's currency, converted to euros at the ECB reference rate on the transaction date, then HMRC converts the euro figure to GBP. Your accounting software records sales in GBP at your chosen conversion rate (typically the Stripe or PayPal settlement rate). Currency conversion differences are the most common source of small variances. A £50 variance on £100,000 turnover is immaterial; a £5,000 variance triggers a letter. Reconcile at the gross sales line: take the platform's reported GMV (available in your Seller Central or platform dashboard by 31 January each year), compare it to the sum of your sales invoices or revenue journal entries for that platform for the same calendar year, and document any difference with an explanation (refunds processed in January for December sales, currency conversion, cancelled orders after the platform snapshot).

Refunds and chargebacks complicate the picture. Platforms typically report gross sales before refunds, then note the refund count separately. Your accounting records should show net sales (gross minus refunds). If the platform reported £120,000 GMV and you show £115,000 net revenue, the £5,000 gap should match your refunds ledger for that year. HMRC guidance states that platform operators may report gross or net figures depending on their system design, so always check the platform's explanatory notes. Amazon Seller Central publishes a

If you want SCA to check how this applies to your ecommerce accounts, book a discovery call and we will map the cleanest treatment before the next VAT return.

Primary-source checks before you file

Before submitting a return, compare the platform statement with HMRC's own guidance on reporting rules for digital platforms and the OECD model rules at oecd.org. If you sell through Amazon or TikTok Shop, our Amazon FBA accountant and marketplace accounting workflows help reconcile the reported gross platform figures back to sales, refunds, fees, VAT, and bank payouts before the tax return is filed.