VAT errors are common because VAT touches sales, expenses, invoices, software and cash flow. Most mistakes can be avoided with better monthly bookkeeping and a few checks before submission.
Using the wrong VAT code
Accounting software makes VAT easier, but it does not make every decision for you. The wrong code can overstate or understate VAT.
- Check zero-rated, exempt and outside-scope items
- Review imports and reverse charge transactions
- Do not copy old coding blindly
Claiming VAT without proper evidence
You normally need a valid VAT invoice to reclaim input VAT. A card receipt or bank line may not be enough.
- Keep supplier invoices
- Upload receipts monthly
- Check invoice dates and supplier VAT details
Forgetting payment processors
Stripe, PayPal, SumUp and marketplace platforms can make sales reconciliation harder because fees are deducted before money reaches the bank.
- Reconcile gross sales and fees
- Check platform reports
- Avoid treating net deposits as full sales
Spending VAT money
VAT collected from customers can feel like normal cash in the bank. It is not. Set it aside if cash flow is tight.
- Estimate VAT monthly
- Use a separate savings pot
- Plan before the deadline
Leaving checks until the deadline
Rushed VAT returns are more likely to contain errors. A monthly bookkeeping routine gives you time to fix missing paperwork.
- Reconcile every month
- Review VAT before submission week
- Ask questions early
Key takeaway
Most VAT mistakes are bookkeeping routine problems, not complicated tax problems.
