How due dates are computed

Due dates are computed from each rule's declarative timeline, not typed in by hand. That means they shift correctly with the period and your financial year, and they update everywhere when a statutory date changes.

The timeline types

• Monthly — a fixed day of the following month (e.g. GSTR-3B on the 20th, TDS payment by the 7th).
• Quarterly — a number of days after the quarter ends (e.g. TDS returns).
• Annual — a fixed month and day (e.g. AOC-4 and MGT-7 after the AGM).
• Days after period end — used where the deadline is relative to a period close rather than a fixed calendar date.
• Event-based — triggered by an event (incorporation, a notice, a new hire).

Worked example

For a monthly GST return with a due day of 20 and an offset of one month, the April period (ending 30 April) produces a due date of 20 May. Change the statutory day in the rule and every period's due date recomputes — no edits to any screen.

Look one up

The free due-date checker uses the same logic the app does, so you can confirm a single deadline without signing in.