VAT Calculator
Add or remove VAT from a net or gross price at a chosen VAT rate. Runs locally in your browser. Free online tool — no sign-up. Fast and free.
Enter values to calculate.
Trust summary CVP VERIFIED · CVP protocol 1.0.0-proposed · Core assurance
- Input interpretation
- Enter values to calculate.
- Result
- —
- Assurance
- Core
- Declared partition coverage
- PASS · 5/5 declared partitions (add, remove, zero-rate, clamp, invalid-domain) · Matrix
- Known limitations
- Nonnegative amount and rate; add or remove one flat VAT/GST rate
- Core CVP does not include live graph, viewport, or pointer interaction.
- Model
- Net, VAT amount, and gross when adding or removing a percentage VAT rate.
- Scope
- Single flat rate on the entered amount
- Verification
- Engine tested · Specification checked · v1.3.0 · CVP VERIFIED · CVP protocol 1.0.0-proposed · Core assurance· View Manifest · CVP overview · Specification
- Versions
- Calculation 1.3.0 · CVP protocol 1.0.0-proposed · Evidence 2026-09-29.release-truth-v1.1
- Verification revision
- 2026-09-29.release-truth-v1.1 · 2/2 property · digest 27e7eea78d25
- Legacy regression
- 4/4 tests · Production surface contract 6/6
- Trust layers
- Verification VERIFIED · Production CURRENT · Overall CVP state: VERIFIED under CVP 1.0.0-proposed
- Reference
- O1 model · O2 expected_values · O2 numerical_behavior
- Interfaces
- PASS · UI (SSR) / REST / MCP
- Supplemental domain review
- Not performed
- Named expert review
- Not performed
- CVP suite
- 5/5 golden · 2/2 CVP boundary · 1/1 invalid · 2/2 property · 1/1 metamorphic · 1/1 round-trip · 1/1 cross-interface · 6/6 CVP contract · Manifest
- Specification basis
- OECD International VAT/GST Guidelines — value-added tax as a consumption tax on the value added
- HMRC VAT guide (UK, conceptual) — gross = net × (1 + rate); net = gross / (1 + rate)
- Evidence
- 4 legacy golden · legacy regression suite · 5/5 oracle-backed golden · 1/1 invalid · Artifact integrity PASS
- Semantic contract
- PASS
Full verification
Formulas
Core equations used by this calculator.
How to use
Choose Add VAT or Remove VAT
Add when you know the ex-VAT price; remove when the price already includes VAT.
Enter amount and rate
Use a preset (0%, 5%, 20%, …) or type any percent.
Read net, VAT, and gross
All three values appear in the result.
Example calculations
Common configurations with formula and result.
Add 20% to 100
Net 100 · 20%
Add 5% to 1000
Reduced rate
Remove 20% from 120
Gross 120 · 20%
Remove 20% from 1000
Gross inclusive
Quick add / remove at common rates
Common values at a glance.
| Amount | Rate | Add VAT → gross | Remove VAT → net |
|---|---|---|---|
| 100 | 20% | 120 | 83.33 |
| 1000 | 20% | 1200 | 833.33 |
| 500 | 20% | 600 | 416.67 |
| 1000 | 5% | 1050 | 952.38 |
| 200 | 5% | 210 | 190.48 |
| 100 | 0% | 100 | 100 |
VAT calculator specification
Version 1.3.0 · Engine tested
- Engine tested 4/4 tests · Production surface contract 6/6
- Named expert review Not performed
- Calculation version 1.3.0
- Definition
- Value-added tax (VAT) is a consumption tax charged as a percentage of the net price. To add VAT: Gross = Net × (1 + rate/100) and VAT = Net × rate/100. To remove VAT from a tax-inclusive price: Net = Gross × 100 / (100 + rate) and VAT = Gross − Net. This calculator supports any rate (default 20%).
- What it calculates
- Net, VAT amount, and gross when adding or removing a percentage VAT rate.
- Inputs
- Amount (net when adding; gross when removing)
- VAT rate in percent
- Outputs
- Net (ex VAT)
- VAT amount
- Gross (inc VAT)
- Formula
Gross=Net·(1+r/100); Net=Gross·100/(100+r)- Assumptions
- Single flat rate on the entered amount
- No multi-rate baskets or input-tax credits modeled
- Units
- Currency units consistent for all money fields
- Rate as percent
- Boundary conditions
- Rate 0 → net = gross, VAT = 0
- Negative inputs clamped to 0
- Example
- Net 100 at 20% → VAT 20, gross 120
- Validation cases
4 published on this page · 4/4 tests · Production surface contract 6/6 · View evidence
- Add 100 @ 20% → Net 100, VAT 20, Gross 120
- Remove 120 @ 20% → Net 100, VAT 20, Gross 120
- Add 1000 @ 5% → Gross 1050, VAT 50
- Remove 1000 @ 20% → Net 833.33, VAT 166.67
- Specification basis
- OECD International VAT/GST Guidelines — value-added tax as a consumption tax on the value added
- HMRC VAT guide (UK, conceptual) — gross = net × (1 + rate); net = gross / (1 + rate)
- Calculation version
- 1.3.0
Background
Interpretation and common distinctions.
Add or remove VAT (value-added tax) from a price. Default rate 20%.
Add VAT example: Net 100 → VAT 20 → Gross 120.
Common rates (illustrative)
| Rate | Typical use |
|---|---|
| 20% | Standard rate in many jurisdictions (e.g. UK standard) |
| 5% | Reduced rate on selected goods/services |
| 0% | Zero-rated supplies (VAT amount is 0) |
| 15–27% | Common standard-rate band in many EU countries |
Always verify the correct legal rate for your product and country.
Net vs gross
| Term | Meaning |
|---|---|
| Net (ex VAT) | Price before tax |
| VAT | Tax portion |
| Gross (inc VAT) | Price the customer pays |
Related tools
Other calculators in this family: GST Calculator, Percentage Calculator, Simple Interest .
Frequently asked questions
Key distinctions behind the calculation.
How do I add VAT to a net price?
Multiply by (1 + rate/100). At 20%: Gross = Net × 1.2. VAT = Net × 0.2. Example: 100 → VAT 20, gross 120.
How do I remove VAT from a gross price?
Divide by (1 + rate/100), or Net = Gross × 100 / (100 + rate). At 20%: Net = Gross ÷ 1.2. Example: 120 → net 100, VAT 20.
What is the difference between net and gross?
Net (ex VAT) is the price before tax. Gross (inc VAT) is what the customer pays. VAT is the difference: Gross − Net.
What VAT rate should I use?
It depends on your country and the goods or services. Many jurisdictions use a standard rate (often around 15–27%), plus reduced and zero rates for specific categories. Confirm with official guidance.
Is VAT the same as GST or sales tax?
VAT and GST are both multi-stage consumption taxes; names differ by country. Retail sales tax is usually collected only at the final sale. The add/remove percent math is similar when you apply a single rate to a price.
What about 0% or exempt supplies?
At 0%, net equals gross and VAT is 0. Exempt rules are legal categories — this tool only does the percentage arithmetic you enter.
Can I use any currency?
Yes. Enter amounts in any unit; the calculator is currency-agnostic.