For the week commencing 21 September 2026, UK Amazon and Shopify sellers face several important VAT, fulfilment and cross-border compliance deadlines. Use this roundup to reconcile your records, protect your margins and prepare for Q4 trading.
1. Prepare for the 7 October VAT return deadline
If your VAT quarter ended on 31 August 2026, you must submit your VAT return and ensure cleared payment reaches HMRC by 7 October 2026.
The standard rule is one calendar month and seven days after the accounting period ends. This deadline applies even when you submit through Making Tax Digital-compatible software. HMRC’s guidance confirms that you must file and pay by the same date.
Before submitting, complete this reconciliation checklist:
- Match Amazon settlement reports to your bookkeeping records.
- Reconcile Shopify payouts against individual orders.
- Separate sales, refunds, chargebacks and payment fees.
- Check VAT treatment for UK sales and EU sales.
- Review stock location and fulfilment country for cross-border orders.
- Confirm whether marketplace-collected VAT has been recorded correctly.
- Investigate timing differences between order date, dispatch date and payout date.
- Make sure your payment will reach HMRC’s account by the deadline.
Accurate ecommerce bookkeeping in the UK depends on reconciling platform reports, not simply importing bank transactions. This is why a structured monthly or daily process helps prevent underpayments, duplicated income and incorrect VAT claims.
The UK VAT registration threshold remains £90,000 of taxable turnover on a rolling 12-month basis. You must also monitor the 30-day forward look. The deregistration threshold remains £88,000.
2. Control Amazon Q4 deadlines and rising fulfilment costs
Q4 preparation is now urgent for Amazon sellers.
Key Amazon UK dates
- 16 September 2026: recommended UK inventory arrival date for Prime Big Deal Days has passed.
- 23 September 2026: deal submissions close for Prime Big Deal Days.
- 15 October 2026: festive peak fulfilment fee begins.
- 28 October 2026: recommended UK inventory arrival date for Black Friday Week.
- 18 November 2026: Black Friday Week deal submissions close.
- 14 January 2027: festive peak fulfilment fee ends.
For selected UK FBA orders from 15 October 2026 to 14 January 2027, Amazon’s average additional festive peak charge is:
- £0.12 per parcel item for small and standard parcels.
- £0.07 per large or extra-large envelope item.
The fee can apply to local FBA and Remote Fulfilment EU-to-UK orders. Oversize and Low-Price FBA items are exempt. Amazon determines the applicable fee by the ship date, so late dispatches can change the charge applied to an order.
The separate 1.5% fuel and logistics surcharge has applied year-round since 17 April 2026. It should be included in your Q4 margin calculations.
Promotion costs also matter. Amazon promotion fees are £12 upfront per promotion, plus 0.75% of promotional sales, capped at £600 for the variable element. Update your contribution margin before accepting deals.
Use Amazon’s Revenue Calculator and FBA Fee Preview report to model:
- Referral fees.
- FBA fulfilment fees.
- Peak charges.
- Fuel and logistics surcharges.
- Storage and removal costs.
- Promotional fees.
- VAT and marketplace settlement timing.
This is a key task for any Amazon FBA accounting UK process. A promotion can increase revenue while reducing cash contribution if fees and fulfilment costs are not included.
3. Check Amazon FBM delivery performance
From 30 September 2026, Amazon.co.uk Fulfilment by Merchant sellers must maintain a 90% business-hour delivery rate for Amazon Business customers.
From 30 October 2026, Amazon may deactivate listings for business customers if the required rate is not achieved.
Review your FBM controls now:
- Compare promised handling time with actual dispatch time.
- Review carrier delivery performance by SKU.
- Correct inaccurate inventory quantities.
- Check business-hour delivery data in Seller Central.
- Identify SKUs at risk of deactivation.
Amazon is also activating Automated Handling Time for SKUs where the configured handling time has been exceeded by actual performance for more than 30 days. Following the 15 July 2026 change, account-level default handling time displays only zero-day and one-day options.
Document your fulfilment data. It supports both operational decisions and accurate ecommerce accounting.
4. Separate company obligations from MTD for Income Tax
HMRC began auto-enrolling eligible sole traders from September 2026 for the 2026/27 phase of Making Tax Digital for Income Tax. The relevant qualifying income threshold is above £50,000.
The second quarterly update for 2026/27 is due on 7 November 2026. Affected individuals must keep digital records and use compatible software.
This regime applies to eligible individuals with self-employment and/or property income. Limited companies are not in scope in the same way. A UK Limited Company remains subject to its corporation tax, payroll, VAT and Companies House obligations rather than being treated as a sole trader under this MTD phase.
If you operate through both a company and personal sole-trader activity, keep the records separate. Mixing company sales, personal income and platform payouts creates avoidable filing errors.
5. Review VAT refunds for non-UK VAT group members
HMRC’s Revenue and Customs Brief 8 (2026), published on 8 September 2026, changes how eligible non-UK businesses in a UK VAT group claim UK VAT refunds.
The general rule is that the non-UK business that incurred the VAT must submit its own claim. The representative member cannot claim unless it incurred the cost itself.
For the transitional prescribed year from 1 July 2025 to 30 June 2026, HMRC will accept claims from either:
- The non-UK VAT group member that incurred the VAT.
- The VAT group’s representative member.
The deadline is 31 December 2026. HMRC may also reconsider certain claims rejected since 1 January 2021, subject to the conditions in the Brief. Review historic claims now so you do not lose recoverable VAT.
6. Correct the UK VAT rate after the temporary reduction
HMRC Agent Update issue 147, published 17 September 2026, confirms that the temporary 5% VAT rate for qualifying children’s meals, tickets and family attractions ended on 1 September 2026.
Relevant sales from 2 September 2026 should generally use the standard 20% VAT rate.
Affected businesses should check:
- Tills and point-of-sale systems.
- Booking platforms.
- Menus and price lists.
- Ecommerce product settings.
- Accounting software.
- VAT reports and credit notes.
