GST & VAT Calculator
Add or remove GST/VAT from any amount, or compare both side by side
GST Results
Fill in the details and click Calculate.
Frequently Asked Questions
Total Price = Base Price + Tax Amount
Example: Base price £500, VAT 20% → Tax = £100 → Total = £600.
Tax Amount = Inclusive Price − Base Price
Example: VAT-inclusive price £600 at 20% → Base = £600 / 1.20 = £500 → VAT = £100.
About This Tax Calculator
What This Tool Does
This combined GST & VAT Calculator lets you add tax to a base price, remove tax from an inclusive price, compare all rates at once, and compare GST vs VAT side by side. It supports India GST slabs, UK/EU VAT rates, and custom rates for any country.
Common Use Cases
- Invoice pricing — add correct tax before billing
- Expense reports — extract net amount from receipts
- International business — compare tax burden by country
- E-commerce — display tax-inclusive prices
- Accounting — reconcile GST/VAT payable
Standards & References
Related Calculators
Related Articles
View all articles
Salary Sacrifice Saves NI as Well as Income Tax — Here's the Full Calculation Most Pension Communications Skip
Salary sacrifice reduces both income tax AND National Insurance — the NI saving is the less-known part, worth 8% for basic-rate taxpayers. Here's how salary sacrifice differs from personal pension contributions (the NI is never charged rather than refunded), how employers save 13.8% employer NI on sacrificed salary and may share it, and why salary sacrifice interacts with the Child Benefit High-Income Charge threshold in ways personal contributions don't.
Why Not All Tax Deductions Are Equal: Pension Relief, Gift Aid, and the Order That Changes Your Bill
Income tax is calculated on what's left after deductions — but the type and order of deductions changes your final bill even when the total amount is the same. Here's why pension contributions that reduce "Adjusted Net Income" can restore the personal allowance (creating 60% effective relief near £100k), how Gift Aid works in two directions, why the April 5th timing boundary matters, and the capital vs revenue distinction for business expenses.
Self-Employment Tax: NICs, Allowable Expenses, Payments on Account, and the Ltd Company Decision
Self-employed people pay income tax, Class 4 NICs, and implicitly bear employer NI — more than equivalent employees on the same gross. Here's the complete UK self-employment tax picture, allowable expenses that reduce taxable profit, the payment on account cash flow trap, and when a limited company saves enough to justify the admin.
How Income Tax Brackets Actually Work: Progressive Tax, UK's Hidden 60% Band, and Effective vs Marginal Rates
Tax brackets don't apply to all your income — only to the income in that band. Here's exactly how progressive tax works with UK and US examples, the UK's hidden 60% tax band between £100k–£125k, why National Insurance is effectively a second income tax, and the difference between marginal and effective rates.
Tax Calculator — Find Your Effective Tax Rate & Maximise Deductions
Learn how progressive income tax slabs work, why your effective rate is lower than your marginal rate, which deductions reduce your liability, and how to use a free tax calculator to verify TDS and plan optimally.