The First Major Milestone: The January 2026 Data Dump
We have just passed a significant turning point. On January 31, 2026, major digital marketplaces submitted their first full year of seller data for the 2025 calendar year directly to HMRC. This move is part of the OECD’s model reporting rules, and it changes the fundamental relationship between sellers and the tax office.
What HMRC Now Knows
In previous years, HMRC relied largely on your self-reported figures. Now, they receive automated reports containing:
- Your Gross Sales Proceeds: Exactly how much money passed through the platform.
- Transaction Counts: How many items you sold.
- Platform Fees: Deductions made by the marketplace.
- Seller Identification: Your linked bank accounts and personal details.
This means HMRC can now cross-check your Self Assessment tax returns against third-party data instantly. If there is a discrepancy between what eBay says you earned and what you reported, an automated red flag is likely to follow. Don’t worry: this doesn’t mean you are in trouble if you have been honest; it simply means your record-keeping must be impeccable to explain any differences in fees or returns.
Making Tax Digital (MTD) for Income Tax: The Quarterly Shift
The most significant operational change in 2026 is the rollout of Making Tax Digital for Income Tax Self Assessment (MTD ITSA). For years, ecommerce sellers have operated on an annual cycle: calculating profits once a year and filing by January 31. That era is ending.
Quarterly Reporting is the New Standard
If your gross income (turnover) exceeds £50,000, you are now required to:
- Maintain Digital Records: Paper ledgers or unlinked spreadsheets are no longer sufficient. You must use functional compatible software to track every sale and expense.
- Submit Quarterly Updates: Every three months, you must send HMRC a summary of your business income and expenses. This provides HMRC with a real-time view of your tax liability.
- Final Declaration: At the end of the tax year, you submit a final declaration to confirm your total figures.
It’s About Turnover, Not Profit
A common misconception is that if your profit is low, you don’t need to worry about MTD. This is incorrect. The requirement is based on your gross income. If you sell £55,000 worth of goods but your profit is only £10,000 after costs, you are still legally required to join the MTD scheme.
Managing this volume of data every quarter can be exhausting for a solo founder. This is why advanced financial forecasting and automated compliance are essential: to ensure you never miss a quarterly window.
Stricter VAT Enforcement and the ‘0990’ Reference
VAT compliance has also seen a tightening of the screws. HMRC has introduced new security measures for businesses registering for VAT or changing their legal structure.
The 0990 Application Reference
New VAT applicants now often require a specific application reference number (‘0990’) to complete their registration. HMRC is using this to filter out fraudulent applications and ensure that “deemed supplier” rules are being followed correctly. If you are an overseas seller or a UK business using marketplaces, the marketplace is often responsible for collecting and remitting VAT, but you still have strict reporting obligations.
Failing to apply the correct VAT rate can result in heavy penalties. By using a comprehensive compliance approach, you ensure that your VAT filings in the UK and across the EU are handled with precision, reflecting the latest 2026 regulatory standards.
The Trading Allowance: Who Is Exempt?
Not every casual seller needs to register as a business. HMRC maintains the £1,000 Trading Allowance.
- Under £1,000: If your total gross income from all “side hustles” or ecommerce activities is less than £1,000 in a tax year, you generally do not need to report it.
- Over £1,000: The moment you cross this threshold, you must register for Self Assessment and keep detailed records of sales, platform fees, and inventory costs.
Even if you are just starting out, keeping professional records from day one is essential. It makes the transition to a Limited Company or VAT registration much smoother as you grow.
Looking Ahead: The 2029 E-Invoicing Roadmap
While 2026 is the year of data sharing and quarterly reporting, HMRC has already signaled the next big shift. The UK government has set a target for mandatory e-invoicing to begin in 2029.
By 2026, we expect further guidance on the technical standards for these invoices. E-invoicing will mean that invoices are sent directly from your system to your customer’s system (and potentially HMRC) in a structured data format. This will eliminate manual data entry and further reduce the “tax gap.” Getting your digital records in order today for MTD is the best way to future-proof your business for the e-invoicing mandate of the near future.
FAQ: HMRC 2026 Ecommerce Updates
What are the new HMRC rules for online sellers in 2026?
The 2026 updates focus on automated data sharing from platforms like Amazon and eBay directly to HMRC, and the mandatory start of Making Tax Digital (MTD) for Income Tax, which requires quarterly reporting for those over specific income thresholds.
Does Etsy report to HMRC 2026?
Yes. Since January 2024, Etsy has been required to collect data on UK sellers. By January 31, 2026, Etsy submitted its first full year of seller transaction data to HMRC as part of the automated reporting requirement.
