Sri Lanka VAT Calculator — Add or Remove 18%
Add or strip 18%Value Added Tax from any rupee amount, with a clear base / VAT / total breakdown and a copy-ready invoice line. Defaults to Sri Lanka's current standard rate from 1 January 2024; supports the older 8%, 12%, and 15% rates for reconciling historical invoices. Sources cited below.
How it works
Sri Lankan Value Added Tax is charged under section 5 of the Value Added Tax Act No. 14 of 2002, which defines the VAT payable on a taxable supply as the value of that supply multiplied by the rate specified by Order published in the Gazette. The current Order is Extraordinary Gazette No. 2364/22 (29 December 2023), which sets the standard rate at 18% from 2024-01-01.
Two situations matter for a calculator: addingVAT to a pre-VAT price you're quoting, and removing VAT from a tax-inclusive total to recover the supply value (for accounting or input-credit purposes). With the rate expressed as a decimal r (so 18% becomes 0.18), the math is:
- Add VAT: vat = A × r ; total = A × (1 + r)
- Remove VAT: base = A ÷ (1 + r) ; vat = A − base
The reverse formula can also be written as the “VAT fraction”: vat = A × r ÷ (1 + r). At 18% that simplifies to vat = A × 9 ÷ 59 (since 0.18 / 1.18 = 9 / 59). Both forms agree with this calculator to the cent — switch to remove mode and check the small “Fraction formula” line under the VAT result tile to see it.
Rounding follows the IRD VAT Guide for SMEs (2024): two decimal places on tax invoices, rounded half-up. The “Round to nearest LKR” option is a convenience for cash receipts (kade-style transactions where coins are inconvenient) and is labelled as such — it is not the IRD-prescribed format for tax invoices. The “No rounding” option keeps full precision for downstream calculations.
Historical rates are included so you can match older invoices: 8% from December 2019, 12% from June 2022, 15% from September 2022, and 18% from January 2024. The calculator surfaces a warning banner when a historical rate is selected so it's never used by accident on a current invoice.
Worked examples
Frequently asked questions
Sources & references
- Inland Revenue Department — Value Added Tax (VAT) overview
- Extraordinary Gazette No. 2364/22 (29 Dec 2023) — VAT rate set at 18% from 1 Jan 2024
- Value Added Tax Act No. 14 of 2002 (consolidated, as amended)
- IRD — VAT Guide for SMEs (rounding & tax-invoice rules)
Rates and methodology were last cross-checked against the IRD sources on 2026-05-12. The page is reviewed whenever a new VAT order is gazetted.
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