Free tools
Free VAT and invoice calculators
VAT at 15% added to or taken out of a price, VAT number checks, interest on late payments at the prescribed rate, due dates and hourly totals. Every result opens as a ready South African invoice, free and without sign-up.
Calculators
- VAT calculatorAdd 15% VAT to a price or take it out of a VAT-inclusive price (15/115), then open it as a ready tax invoice. Free, instant, no sign-up.
- VAT number checkerCheck that a South African VAT number is well formed — 10 digits, starting with 4, with a matching check digit — and see how it prints on a tax invoice. Free.
- Late interest calculatorWork out interest on an overdue invoice at the prescribed rate (10.50%, 10.75% from 1 November 2026) or your agreed rate, then invoice it. Free, no sign-up.
- Due date calculatorFind the due date of a South African invoice for 30 or 60 day terms, “30 days from statement” or any number of days, and open it as an invoice with those terms. Free.
- Hourly rate calculatorMultiply hours by your rate and add 15% VAT if you’re a VAT vendor, then open it as a ready South African tax invoice. Free, instant and no sign-up.
Frequently asked questions
Are these calculators free?
Yes, all of them, with no sign-up. They run in your browser: nothing you enter is sent to us.
Can I turn a result into an invoice?
Yes. Each calculator has a button that opens our free South African invoice generator with the amount filled in. Add your VAT number and your client, and download the PDF.