How do you reverse VAT for a custom rate?

Divide the VAT-inclusive total by (1 + VAT rate ÷ 100) to get the net amount. Subtract net from gross to get the VAT portion.

Why not subtract VAT as a percentage of the gross?

VAT is calculated on the net price first. Subtracting a flat percentage of gross understates net and overstates VAT.

Can the total including VAT be negative?

For normal pricing, gross should be zero or positive. The calculator rejects a negative total.

Reverse VAT (Custom Rate)

Calculate

Total inc VAT (£)

VAT rate (%)

Results are estimates for informational purposes only and may be rounded.

Tip: Press Enter to calculate.

Remove VAT from a total using any VAT rate. Find the net amount and VAT portion from a VAT-inclusive price.

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

Worked examples

Example 1

Question: Gross £120 at 20%.

Net = 120 ÷ 1.20 = £100
VAT = 120 − 100 = £20

Example 2

Question: Gross £84 at 5%.

Net = 84 ÷ 1.05 = £80
VAT = £4

Reverse VAT (Custom Rate)

Calculate

When to use this

Worked examples

Example 1

Example 2

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