Sources we implement
- Inland Revenue Act No. 24 of 2017 (consolidated), including the Inland Revenue (Amendment) Act No. 2 of 2025
- IRD APIT Tax Tables, Y/A 2025/26
- IRD notices (e.g. PN/IT/2025-01) and the IRD guides to the individual return and the Statement of Estimated Tax
Verification & updates
Each calculator is checked against the IRD’s own published tables and example computations. When rates change (usually each 1 April, or at a Budget), we update calculators and guides the same day and change the visible “updated” date on the page. Last full verification: 28 August 2026.
Limits
Calculators produce estimates for common situations. They don’t cover every edge case (non-resident rules, trusts, some terminal-benefit cases). Nothing on this site is personal tax advice — for complex affairs, engage a licensed tax practitioner.
Spotted a discrepancy? Tell us: hello@lankantax.com. We treat accuracy reports as the highest-priority issue on the site.