Quarterly VAT Estimator
Calculate
Estimate VAT due for a period using net sales, net purchases and a VAT rate. Useful for a quick VAT return forecast.
Use this calculator when you need a fast, reliable answer without opening a spreadsheet. Enter your figures below and press Calculate. PercentNinja shows the key outputs you typically need for pricing decisions, VAT checks, ecommerce payouts or ad reporting.
When to use this
- Building VAT-inclusive prices from a net figure
- Reverse-calculating net and VAT from a receipt or invoice
- Forecasting VAT due for a period and spotting surprises early
How this tool works
The calculator works out output VAT from net sales and input VAT from net purchases using the VAT rate you enter. It then subtracts input VAT from output VAT to estimate how much VAT is due (or repayable) for the period.
Worked examples
Example 1
Question: Sales £20,000, purchases £6,000, rate 20%.
- Output VAT = 20,000×0.20 = £4,000
- Input VAT = 6,000×0.20 = £1,200
- Due = 4,000 − 1,200 = £2,800
Example 2
Question: Sales £8,000, purchases £9,000, rate 20%.
- Output VAT = £1,600
- Input VAT = £1,800
- Due = −£200 (repayment)
Running a business? Use our Pricing & Profit Hub to find more tools for margins, markups, and tax estimation.