Whenever a UK online seller asks me how HMRC will find out about income, I give the same answer: the data is already there. Payment processors and digital platforms are required by law to share information with HMRC, and the systems for cross-checking have got dramatically more sophisticated in the last two years.
Here is what each major payment processor reports, what HMRC does with the data, and how UK sellers can stay on the right side of compliance.
Why HMRC cares about payment processors
Payment processors sit at the centre of online commerce. They see exactly how much money is moving in and out of your account, who is paying you, and how often. For HMRC, this is gold-standard evidence in a tax enquiry. If your tax return says one thing and Stripe says another, HMRC will believe Stripe.
The good news is that HMRC is not snooping arbitrarily. They use this data to spot people who should be registered for self-assessment but are not, and to verify income figures on existing returns. If you are accurate and registered, you have nothing to fear.
PayPal and HMRC
PayPal has been required to share data with HMRC for over a decade under information powers. The level of detail HMRC can request includes account holder name, address, total transactions, and transaction history. PayPal complies with formal HMRC requests under Schedule 23 of the Finance Act 2011.
PayPal also operates as both a payment processor and (for certain types of activity) a regulated platform. If you receive funds for selling goods or services, that activity can fall within the digital platform reporting rules.
Stripe and HMRC
Stripe is increasingly the go-to processor for UK creators, freelancers, and online businesses. Stripe is required to comply with HMRC information requests in the same way as PayPal. They also issue 1099-K forms in the US, which gets shared with the IRS, and similar reporting is increasing globally. This is particularly relevant for YouTube creators and OnlyFans creators who often receive payments through Stripe-powered platforms.
For UK Stripe users, the practical reality is the same as PayPal: HMRC can see your income if they want to. The rule is not “if I use Stripe, I am invisible”. The rule is “Stripe income is taxable income, full stop”.
Wise and HMRC
Wise (formerly TransferWise) is widely used by sellers handling multiple currencies, especially Amazon FBA sellers paying overseas. Wise is a regulated UK financial institution and is fully subject to HMRC information powers.
Wise multi-currency accounts also fall under FATCA (for US persons) and CRS (Common Reporting Standard) for international tax cooperation. If you hold significant balances or move large sums, your data may be shared with multiple tax authorities.
What about cryptocurrency processors?
Crypto exchanges operating in the UK now have to register with the FCA and share data with HMRC. Coinbase, Kraken, Binance UK, and others have shared user data with HMRC in recent years. From January 2026, the Crypto-Asset Reporting Framework (CARF) requires comprehensive reporting of crypto transactions to HMRC.
If you receive payment in crypto for goods or services, that is taxable income at the GBP value at the date of receipt. HMRC will eventually see it.
What you should be doing
The simplest compliance strategy is to assume HMRC can see everything that hits your payment processors. Then:
- Keep separate business and personal accounts wherever possible
- Reconcile payment processor reports against your accounting records monthly
- Declare gross income (not just what reaches your bank), then claim processor fees as expenses
- Keep records of any refunds, chargebacks, or held funds
- If you receive money for tax-free reasons (gifts, personal sales, loan repayments), document why
What about peer-to-peer apps like Revolut and Monzo?
Revolut and Monzo are UK-regulated banks. They share data with HMRC under the same rules as any UK bank. If you are using a personal Monzo account to receive business income, HMRC can see it just as easily as your high street bank.
Many sellers use these apps because they are convenient, but using a personal account for business income makes life much harder at tax time. Set up a separate business account for trading income.
When you should be worried
The main risk areas are: receiving regular trading income but never registering for self-assessment, declaring lower income than payment processors show, mixing personal and business finances so reconciliation becomes impossible, and ignoring HMRC nudge letters about marketplace or processor activity.
If any of those describe you, the time to fix it is now, before HMRC writes to you. At Simplr Accounting, we help UK online sellers, creators, and small businesses get on top of payment processor reconciliation, register correctly, and file accurate returns. Book a free discovery call to talk through your situation.