Deductions for late arrival are set by the employer's policy, not by a uniform statute: common approaches are a grace period (e.g. the first 10 minutes are ignored), a per-minute deduction, or docking a full hour for any lateness over the grace period. The per-minute method is what this tool computes.

Sri Lankan labour law does not prescribe a fixed per-minute rate, so the deduction basis should come from your employment contract or the company handbook — and any deduction must not take your pay below the legal minimum for the work actually done.

The per-minute rate derives from the same divisor as overtime: basic ÷ 240 (or ÷ 200, or working days × 8 hours) ÷ 60 minutes. At Rs 50,000 on the 240 basis: 50,000 ÷ 240 ÷ 60 = Rs 3.47 per minute — so 30 minutes late deducts about Rs 104.

If your employer uses a fixed per-minute rate, enter it manually (0 = auto).

Enforce late policy consistently and transparently: publish the policy, apply it to everyone, and record deductions on the payslip as a separate line — which is exactly what the payslips from this site do.