Interest we charge

Calculate and report ATO interest
How to adjust pre-fill amounts, or manually calculate and report ATO interest when preparing your tax return.

General interest charge
General interest charge (GIC) is applied to unpaid tax liabilities and is worked out daily on a compounding basis.

Shortfall interest charge
Shortfall interest charge may apply if your tax return is amended and your tax liability increases.

Find out about the interest we charge on outstanding, underpaid and incorrect reports of tax amounts.