GST/HST late-filing penalty and interest calculator

Estimate what an overdue GST/HST return could cost. The penalty is 1% of the net tax owing, plus 25% of that 1% for each complete month overdue, up to 12 months. Interest compounds daily at the prescribed rate. This is an estimate only, and nothing you type is uploaded.

Your return

Net GST/HST owing (CAD) Filing frequency End of the reporting period (sets the deadlines) Or enter the due date yourself (used if no period end) Date filed and paid (leave blank for today) Interest rate, % a year (Q4 2026: 7%)

Enter the amount owing, the frequency and the period end, then press Estimate.

Not included: the repeat-penalty and demand-to-file rules, CRA waivers or adjustments, and any other amounts owed. Check the CRA penalties and interest memo, the current prescribed rate and the CRA reporting deadlines. This is general information, not tax advice.