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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.

By Induwara AshinsanaUpdated May 12, 2026
Sri Lanka VAT Calculator18% standard
IRD verified · Gazette 2364/22
Rs

The pre-VAT supply value. The calculator adds VAT and shows the inclusive total.

Quick amounts
VAT-exclusive (base)
Rs 47,200.00
Your input
VAT @ 18%
Rs 8,496.00
VAT-inclusive (total)
Rs 55,696.00
Base + VAT

Invoice line preview

Subtotal: Rs 47,200.00 / VAT (18%): Rs 8,496.00 / Total: Rs 55,696.00

18% (current) — Extraordinary Gazette No. 2364/22.

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

Add 18% VAT to a service quote

Mode: Add · Rate: 18% · Amount: Rs 40,000.00

  1. VAT = 40,000 × 0.18 = 7,200.00
  2. Total = 40,000 + 7,200 = 47,200.00
  3. Base Rs 40,000.00 / VAT Rs 7,200.00 / Total Rs 47,200.00

Reverse-calculate from a VAT-inclusive supermarket receipt

Mode: Remove · Rate: 18% · Amount: Rs 11,800.00

  1. Base = 11,800 ÷ 1.18 = 10,000.00
  2. VAT = 11,800 − 10,000 = 1,800.00
  3. Cross-check (VAT fraction): 11,800 × 0.18 ÷ 1.18 = 1,800.00 ✓
  4. Base Rs 10,000.00 / VAT Rs 1,800.00 / Total Rs 11,800.00

Historical 15% reconciliation (pre-Jan 2024 invoice)

Mode: Add · Rate: 15% · Amount: Rs 25,000.00

  1. VAT = 25,000 × 0.15 = 3,750.00
  2. Total = 25,000 + 3,750 = 28,750.00
  3. Base Rs 25,000.00 / VAT Rs 3,750.00 / Total Rs 28,750.00

Frequently asked questions

Sources & references

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