VAT on £100.00 (UK 2026)
This page answers: how much UK VAT is due on a £100.00 net (ex-VAT) price, and what the VAT-inclusive total is. At the standard 20% rate, VAT is £20.00 and the gross total is £120.00. At the reduced 5% rate (when it applies), VAT is £5.00 and the gross is £105.00. If the supply is zero-rated, VAT is £0.00 and the total stays £100.00. Use the calculator below to switch modes or try a custom rate.
By Sammy S. · Founder · AuthorUpdated for 2026
Calculate from £100.00
Pre-filled with £100.00. Switch rate or use remove mode for VAT-inclusive totals.
Your inputs
Mode, amount (GBP), and VAT rate
Enter the net (ex-VAT) price to get the VAT-inclusive total.
Most goods and services
Gross total (incl. VAT)
20% VAT£120.00
£100.00 × 20% = £20.00 VAT.
Add or remove VAT for invoices, quotes, and receipts.
The VAT amount and total (or ex-VAT price) above come from the amount, rate, and add/remove mode you enter — not a live HMRC feed. Rates match published UK VAT bands on gov.uk. Below are the formulas, steps, and worked examples from the same engine as the live calculator.
Worked example — add 20%
Add 20% VAT — £100.00 net
| Mode | Add VAT |
| Net amount | £100.00 |
| Rate | 20% |
| VAT | £20.00 |
| Gross total | £120.00 |
£100.00 × 20% = £20.00 VAT → £120.00 gross
Worked example — remove 20%
Remove 20% VAT — £120.00 gross
| Mode | Remove VAT |
| Gross (incl. VAT) | £120.00 |
| Rate | 20% |
| Net (ex-VAT) | £100.00 |
| VAT embedded | £20.00 |
£120.00 ÷ 1.20 = £100.00 net; VAT = £20.00
Reduced rate (5%)
£100.00 × 5% = £5.00 VAT → £105.00 gross
Formulas
- Add VAT — VAT amount: VAT = Net price × (Rate % ÷ 100)
- Add VAT — gross total: Gross = Net + VAT
- Remove VAT — net price: Net = Gross ÷ (1 + Rate % ÷ 100)
- Remove VAT — VAT embedded: VAT = Gross − Net
- Rounding: All GBP amounts rounded to the nearest penny (2 decimal places)
Calculation steps
- Choose the VAT rateStandard 20%, reduced 5%, zero 0%, or a custom %
Most goods and services use the standard rate. Reduced and zero rates apply only to qualifying supplies — check HMRC guidance for your product.
- Choose add or remove modeAdd: amount is ex-VAT · Remove: amount includes VAT
Add mode prices a shelf/net figure up to a customer total. Remove mode backs VAT out of an invoice or receipt gross.
- Add VATVAT = Amount × Rate; Gross = Amount + VAT
Multiply the net price by the rate, then add VAT to get the gross.
- Remove VATNet = Gross ÷ (1 + Rate); VAT = Gross − Net
Because Gross = Net × (1 + Rate), divide the VAT-inclusive total by (1 + rate) to isolate the net.
- Round to penceround(value, 2) — half-up to 2 decimals
Matches typical invoice rounding. Tiny differences can appear if you add then remove on odd amounts.
Key takeaways — £100.00 net
- £100.00 net + 20% VAT = £120.00 gross (£20.00 VAT).
- £100.00 net + 5% VAT = £105.00 gross (£5.00 VAT).
- Zero-rated: £100.00 net → £100.00 gross (VAT £0.00).
- Removing 20% from £120.00 returns £100.00 net (VAT fraction 1/6 ≈ £20.00).
- Confirm whether your supply is standard, reduced, zero-rated, or exempt before quoting a customer.
Breakdown at £100.00 net
VAT £20.00
VAT £5.00
VAT £0.00
From £120.00
Sample invoice line @ 20%
| Net (ex-VAT) | £100.00 |
| VAT @ 20% | £20.00 |
| Gross (incl. VAT) | £120.00 |
Adding 20% VAT to £100.00
Start with a net price of £100.00. Multiply by 0.2 to get VAT of £20.00, then add for a customer total of £120.00.
This is the usual calculation for standard-rated goods and services sold by a VAT-registered business. On an invoice, list net, rate, VAT, and gross separately.
Reduced-rate check at £100.00
If HMRC treats the supply as reduced-rated, VAT drops to £5.00 and the gross is £105.00 — £15.00 less than the standard-rated gross.
Reduced rate is not automatic for “cheap” or “essential” items — only qualifying categories under HMRC rules (for example children’s car seats and domestic fuel/power when conditions apply).
Zero-rated vs £100.00 at standard rate
A zero-rated supply at £100.00 net has £0.00 VAT. Compared with standard rate, the customer saves £20.00 on this line.
Most food for human consumption is zero-rated, but catering, hot takeaways, alcohol, confectionery, and many soft drinks are standard-rated — check HMRC notices before assuming 0%.
Working backwards from a VAT-inclusive total
If a receipt shows £120.00 including 20% VAT, the net is £100.00.
Use remove mode whenever the amount you see already includes VAT. The 20% VAT fraction shortcut is gross × (20 ÷ 120) = gross × 1/6.
When this amount shows up in real life
£100.00 is a common quote, deposit, or line-item size for freelancers and small traders. Model it ex-VAT first if you are (or expect to be) VAT-registered, then add the correct rate.
Registration is about taxable turnover across a period (threshold £90,000), not whether a single invoice equals £100.00.
Checklist
- Verify £100.00 is the net (ex-VAT) figure before adding VAT.
- Pick standard vs reduced vs zero based on the supply, not the amount.
- Round to the nearest penny on invoices.
- Do not add 20% again if the figure already includes VAT — use remove mode.
- Keep the calculation for your records if you are VAT-registered.
Other amounts
Related tools
- UK VAT calculator hub — Add or remove VAT at any amount
- US sales tax calculator — Add/remove tax by US state
- GST/HST Canada — Canadian sales tax by province
- UK paycheck calculator — Income tax + National Insurance
FAQ — VAT on £100.00
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