Filing Deadline Calculator

Work out filing deadline instantly with clear inputs, formula shown and shareable results.

About Filing Deadline Calculator

Procedural deadlines are counted from the trigger date — service, judgment or notification — on either a calendar or a working-day basis, and a deadline landing on a non-business day is normally rolled forward to the next one. Which basis applies is set by the governing rules, not by choice.

Formulas

Calendar basis

Deadline = Trigger date + Days allowed, rolled forward off a weekend

Working-day basis

Count forward the required number of Monday-to-Friday days

Worked example

With the default values below, Filing Deadline Calculator returns Filing deadline of September 1, 2025. Change any input above and every figure here is recalculated in your browser.

Inputs used

Date the period starts running: 2025-08-01
Days allowed to file: 30
Day counting basisone of Calendar days, Working days (Mon-Fri): Calendar days

Results

Filing deadline: September 1, 2025
Calendar days from trigger to deadline: 31
Days remaining from today: -423
Counting basis: Calendar days, rolled forward off a weekend

Step by step

1Values used
2Calendar basis
3Working-day basis
4Filing deadline= 2025-09-01
5Calendar days from trigger to deadline= 31
6Days remaining from today= -423
7Counting basis= Calendar days, rolled forward off a weekend

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or fees or charges into account.
Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Indicative estimate only. Fees, entitlements, limits and formulas vary by jurisdiction, statute, policy wording and the facts of the case. This is not legal, tax, insurance or financial advice — confirm with a qualified professional or the relevant authority.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Indicative estimate only. Fees, entitlements, limits and formulas vary by jurisdiction, statute, policy wording and the facts of the case. This is not legal, tax, insurance or financial advice — confirm with a qualified professional or the relevant authority.

Frequently Asked Questions

Is the trigger date itself counted?

Usually not — periods normally start the day after the triggering event. Confirm against the applicable rules.

Are public holidays excluded?

Under most working-day rules yes. This calculator excludes weekends only, so subtract holidays in your jurisdiction separately.