VAT calculator (add or remove VAT)

How to use it

Enter your figures above — the result updates instantly and nothing leaves your browser. Results are illustrative, not a quote, tax computation or credit decision.

How to interpret the result

The figure the calculator returns is either a gross price with VAT added, or the VAT element sitting inside a price you already quote as gross — it isn't a statement of what your company will actually pay or reclaim. What matters for your own accounts is whether you're VAT-registered and whether the supply in question is standard-rated, reduced-rated, zero-rated or exempt, since the calculator has no way of knowing which category applies to a given transaction.

Treat the output as a starting point for a quote, invoice or budget line rather than a finished number. If you're building a proposal for a customer, it's worth double-checking the rate you've entered matches the rate that will actually apply on the invoice date, since rates and category treatment can differ by product, service and customer type.

Limitations and good practice

The tool assumes a single flat rate applied to a single amount — it doesn't handle mixed-rate invoices, partial exemption, the flat rate scheme, or VAT already reclaimed elsewhere in a supply chain. Where an invoice includes items at more than one rate, work out each portion separately rather than applying one rate to the whole total.

Because the calculation happens in your browser and nothing is stored or submitted, it's suited to quick sense-checks rather than bookkeeping records — your accounting system or accountant remains the source of truth for anything that ends up in a VAT return. If you're using the result to plan cash flow around a purchase, it's worth reading alongside the asset finance calculator where the spend involves financed equipment, or checking how we lend if the VAT amount itself is what's creating a short-term funding gap.