Estimate GST late fee and interest

Use this calculator to estimate exposure from a delayed GST return. It gives a practical split between late fee and interest, so you can decide whether to file immediately or get support.

1. Return type

2. Delayed days

3. Tax liability

Set `0` for a nil return.

4. Was it a nil return?

Estimated Exposure

GST delay summary

Total estimated cost

This is an indicative planning estimate. Actual GST exposure can still vary by return type, law updates, state-specific practice, and whether payment or filing delay happened together.

Late fee

per day, capped at .

Interest

Calculated at % annualized on unpaid tax.