How to use this VAT calculator
This calculator helps you quickly add VAT to a net price or remove VAT from a gross price. Enter the amount, type the VAT rate, choose the calculation mode, and click Calculate VAT. You will instantly see the VAT amount, the net amount, and the gross amount.
- Add VAT mode: Use when your amount does not include tax yet.
- Remove VAT mode: Use when your amount already includes tax and you want the pre-tax value.
- Custom VAT rate: Works with any rate such as 5%, 7.5%, 10%, 20%, or 25%.
What is VAT?
VAT (Value Added Tax) is a consumption tax applied to goods and services. Businesses collect VAT from customers and pay it to tax authorities, usually after offsetting VAT paid on business purchases. Depending on your country and product category, VAT rates may be standard, reduced, or zero-rated.
For individuals, VAT usually appears as part of the final price. For businesses, separating net and VAT amounts is essential for invoicing, accounting, and tax filing.
VAT formulas you should know
1) Add VAT to a net amount
If the price before tax is net, then:
- VAT amount = Net × (VAT rate ÷ 100)
- Gross amount = Net + VAT amount
2) Remove VAT from a gross amount
If the price already includes VAT, then:
- Net amount = Gross ÷ (1 + VAT rate ÷ 100)
- VAT amount = Gross − Net
Worked examples
Example A: Adding 20% VAT
Net price = 100.00
VAT rate = 20%
VAT = 100.00 × 0.20 = 20.00
Gross = 100.00 + 20.00 = 120.00
Example B: Removing 20% VAT
Gross price = 120.00
VAT rate = 20%
Net = 120.00 ÷ 1.20 = 100.00
VAT = 120.00 − 100.00 = 20.00
When this calculator is useful
- Creating invoices and quotes for clients
- Checking supplier bills for correct VAT amounts
- Comparing prices between tax-inclusive and tax-exclusive listings
- Budget planning for projects, procurement, and service contracts
- Quickly validating totals before filing VAT returns
Common VAT mistakes to avoid
- Applying the wrong VAT rate for a product or service category
- Adding VAT when the amount already includes VAT
- Using gross values as if they were net in accounting reports
- Rounding too early across multiple line items
- Forgetting country-specific VAT rules for digital or cross-border sales
Practical tips for accurate calculations
Use consistent rounding rules
For most business use, round to two decimal places at the invoice line level or at the total level, following your local accounting standards.
Store both net and gross values
Keeping both values in your records makes reconciliation easier and helps reduce reporting mistakes.
Double-check tax-inclusive prices
Online marketplaces and suppliers often display VAT-inclusive amounts. Use remove mode to verify the net value before comparing vendor prices.
Final note
This calculator is designed for fast, practical VAT math. It is ideal for day-to-day estimating and invoice checks. For official tax treatment, always confirm local regulations or consult a qualified tax professional.