Invoice Calculator
Calculate invoice totals with VAT, discounts, and payment terms. Includes line-item builder, VAT split calculator, and professional invoice preview.
Quick Calculator Get a fast estimate
R
%
Invoice Total
R 11 500
Subtotal
R 10 000
Discount
None
VAT (15%)
R 1 500
Payment Due
21 April 2026
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South African VAT on Invoices
SA VAT is 15% on the VAT-exclusive price. To add VAT: multiply by 1.15. To extract VAT from an inclusive price: divide by 1.15 (the base) and subtract to get VAT. VAT-registered businesses must display their VAT number (4xxxxxxxxx format) on all tax invoices over R50.
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R
R 12 000
%
| Subtotal | R 12 000 |
| VAT (15%) | R 1 800 |
| Total Due | R 13 800 |
SA Tax Invoice Requirements
| Requirement | Threshold |
|---|---|
| Words "Tax Invoice" | All invoices |
| Supplier VAT number | All invoices |
| Sequential invoice number | All invoices |
| Buyer's name & address | Invoices >R5,000 |
| Buyer's VAT number | Invoices >R5,000 |
| Simplified tax invoice (abridged) | Invoices ≤R5,000 |
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Invoice Builder
days
My Business
INVOICE
INV-001
2026-03-22
Bill To:
Client Name
R
R 5 000
%
| Subtotal | R 5 000 |
| VAT (15%) | R 750 |
| TOTAL DUE | R 5 750 |
Payment Due: 21 April 2026 (Net 30 days)
Frequently Asked Questions
To add VAT: multiply the excl-VAT price by 0.15 to get VAT, then add to the price (or multiply by 1.15 directly). To extract VAT from an inclusive price: divide by 1.15 to get the excl-VAT amount; the VAT = total - excl-VAT amount. Example: R11,500 ÷ 1.15 = R10,000 excl-VAT; VAT = R1,500.
Yes, if your invoice or contract specifies late payment interest. The default rate under the Prescribed Rate of Interest Act 55 of 1975 is 15.5% per annum (~1.29%/month). Include your payment terms and interest clause on every invoice. For government/public sector clients, the Public Finance Management Act governs payment — 30 days is the legal maximum.