Sales Tax & VAT
Apply pre-tax discounts and sales tax / VAT to get the final price
About this calculator
The Sales Tax & VAT Calculator applies a pre-tax discount and then sales tax or VAT in the standard tax-exclusive order: discount off the list price first, tax on the discounted subtotal. It reports the discount amount, subtotal, tax amount, final total, and the effective percentage paid versus the original list price — negative when the discount outweighs the tax. Currency-neutral and precise to the cent; negative inputs are rejected.
How to use the Sales Tax & VAT calculator
- Enter your amounts, rates and terms into the input fields.
- Read the result — it updates instantly as you type.
- Adjust the inputs to compare scenarios side by side.
- Copy the page URL to share the exact calculation.
Common examples
- 100 at 8.25% tax → 8.25 tax, 108.25 total
- 79.99 with 20% off then 7% tax → subtotal 63.99, tax 4.48, total 68.47 (−14.40% vs list)
- 250 with 15% off and 20% VAT → subtotal 212.50, VAT 42.50, total 255.00 (+2.00% net)
Frequently asked questions
How does the Sales Tax & VAT calculator work?
Enter your amounts, rates and terms, and the calculator applies the standard financial formulas to show the outcome, including intermediate figures where they help you understand the result. All arithmetic runs at high precision, so rounding errors do not build up across periods.
When would I use the Sales Tax & VAT calculator?
Use it when planning a purchase, loan, investment or budget, to compare options before committing, or to sanity-check figures quoted to you. It is an educational tool, not financial advice — confirm important decisions with your provider or a professional.
How accurate are the results?
The formulas are the standard ones used in finance and run at 30 significant digits internally. Real products may differ in fees, compounding conventions and rounding rules, so treat the result as a close estimate rather than a contractual figure.
Can I share a specific calculation with someone else?
Yes. Every value you enter updates the URL, so copying the address bar and sharing the link reopens the exact same calculation for whoever clicks it.