Add it.
£100 + £20 = £120
At 20%, VAT is a fifth of the net price. Choose “Before VAT” to calculate the extra amount and the total.
The VAT formula
Start with a figure01 / INPUT
Try 600 + 240, 80 × 3 or 1200 / 12.
The whole amount, split02 / RESULT
Total including VAT£96.00
£80.00 before VAT, £16.00 of VAT at 20%, £96.00 in total.
Copy
54 trades as published by GOV.UK, plus the limited cost rate
One transaction only. It ignores input VAT you could reclaim and the first-year discount. It does not work out whether you are a limited cost business - pick that option yourself if you are. Not a recommendation to join or leave the scheme.
A calculator on the figures you type. Not tax advice. Rates checked against GOV.UK and flat rate guidance on 16 September 2026.
Your kept sums 0
This session only. Copy before you go.
A few figures to compare? Keep a sum, give it a name, then work out the next one.
How the sums work ↓
The VAT formula
Three sums, and where each one rounds.
Adding VAT: VAT = net × rate, and gross = net + VAT. At 20%, £80 net has £16 of VAT and a gross of £96.
Taking VAT off: net = gross ÷ (1 + rate), and VAT = gross − net. At 20%, £96 gross is £80 net. At 5%, £21 gross is £20 net, with £1 of VAT.
Finding the rate: rate = (gross ÷ net − 1) × 100. £96 gross against £80 net is (1.2 − 1) × 100, which is 20%.
The rounding matters as much as the formula. When adding VAT, round the VAT once, to the penny, and never work the total out again from the rate. When taking it off, keep the gross exactly and let the VAT be whatever is left once the net is rounded, so the two always add up to the invoice. Levy follows both rules and shows its working beside each answer.
Take it out. Properly.
£120 ÷ 1.2 = £100
Reverse VAT starts with division. Taking 20% off the total removes too much. The worked-back note stays beside your result.
Find the percentage.
(gross ÷ net − 1) × 100
Enter both figures to solve the rate. Levy explains the numbers; it never guesses which rate should have applied.
The useful small printWhat this VAT calculator
What this VAT calculator
does, and does not, do.
A calculator on your figures, not tax advice. UK headline rates are 20%, 5% and 0%; whether a rate applies depends on the supply. Check GOV.UK guidance.
The flat rate comparison is arithmetic on a single transaction, not VAT return maths or advice about joining the scheme.
How do I add VAT to a price?
Multiply net by the VAT rate to find the VAT, round to the penny, then add it to net. For example, £100 net at 20% has £20 VAT and a gross total of £120.
How do I remove VAT from a VAT-inclusive price?
Divide gross by 1 plus the rate as a decimal. At 20%, divide by 1.2. £120 including VAT becomes £100 net, with £20 VAT. Subtracting 20% of £120 would give £96, which is not the net price.
Does zero-rated mean VAT-exempt?
No. Zero-rated and exempt are different VAT treatments. This calculator applies a numeric rate; it cannot decide the correct treatment for a sale.
How is the flat rate comparison calculated?
It multiplies this gross amount by the selected trade percentage and compares the result with the VAT on this sale. It is a one-transaction calculation that ignores input VAT reclaim, the first-year discount and the limited cost trader rule. It is not a recommendation to join or leave the scheme.
Can Levy tell me which rate should have applied?
No. The rate solver works backwards from the net and gross figures you enter. It does not determine the correct VAT treatment. If the solved rate is not 20%, 5% or 0%, Levy says: which isn’t a UK rate - check the invoice.
Are my kept sums saved?
The ledger stays only in this page session and disappears on reload. Copy it before leaving. A share link contains the current calculation figures, but not your ledger.
Can I type a sum rather than an amount?
Yes. The amount fields take arithmetic: 600 + 240, 80 × 3, 1200 / 12 and brackets all work. Levy shows the resolved figure beside the field, and says when it rounded to the penny before working out the VAT.