What is the late filing penalty for Sri Lankan tax returns?

Sri Lanka treats late filing and late payment as two distinct offences under the Inland Revenue Act. Both can apply to the same taxpayer simultaneously — missing the return deadline and paying late triggers penalties under Section 178 and Section 179.

Section 178 — late filing of the annual return

The IRD applies whichever of these two amounts is greater:

• 5% of the tax owed, plus 1% of that tax for each additional month the return is overdue
• Rs. 50,000, plus Rs. 10,000 for each additional month overdue

The total penalty is capped at Rs. 400,000 per return. For a taxpayer with no tax liability, the second formula kicks in regardless — meaning the minimum penalty for a single late return is Rs. 50,000.

Section 179 — late payment

Late payment of tax sits in a separate regime with two subsections:

• Section 179(1) — 20% penalty on the unpaid balance tax (the final settlement after the annual return), triggered if payment is more than 14 days late.
• Section 179(2) — 10% penalty on an unpaid quarterly instalment, also triggered after 14 days late.

Both regimes allow a 14-day grace before the penalty kicks in. Pay within 14 days of the due date and you avoid the headline penalty — but Section 157 interest at 1.5% per monthstill accrues from the original due date until the tax is paid. The grace protects the penalty, not the interest.

The cumulative cost

For a taxpayer who owes Rs. 1,000,000 of balance tax and pays six months late, the late-payment cost adds up to: Rs. 200,000 (20% penalty under 179(1)) plus roughly Rs. 90,000 (1.5% × 6 months interest), before any late-filing penalty under Section 178. The cheapest move is always to file and pay on time.