The ATO's general interest charge and shortfall interest charge rates for each quarter, and a calculator for the interest on an amount owing.
Key facts
- The general interest charge (GIC) is 11.51% a year for October–December 2026, compounding daily. It applies to tax and other amounts not paid by the due date.
- The shortfall interest charge (SIC) is 7.51% a year for October–December 2026. It applies to the extra tax when your income tax assessment is amended.
- Both are the 90-day bank bill rate plus an uplift: 3 percentage points for SIC and 7 for GIC, set each quarter.
- The daily rate is the annual rate divided by the number of days in the calendar year.
- $10,000 unpaid for all of October–December 2026 attracts about $294.32 of GIC.
Quarterly rates
| Quarter | SIC a year | SIC a day | GIC a year | GIC a day |
|---|---|---|---|---|
| October–December 2026 | 7.51% | 0.02057534% | 11.51% | 0.03153425% |
| July–September 2026 | 7.43% | 0.02035616% | 11.43% | 0.03131507% |
| April–June 2026 | 6.96% | 0.01906849% | 10.96% | 0.03002740% |
| January–March 2026 | 6.65% | 0.01821918% | 10.65% | 0.02917808% |
| October–December 2025 | 6.61% | 0.01810959% | 10.61% | 0.02906849% |
| July–September 2025 | 6.78% | 0.01857534% | 10.78% | 0.02953425% |
| April–June 2025 | 7.17% | 0.01964384% | 11.17% | 0.03060274% |
| January–March 2025 | 7.42% | 0.02032877% | 11.42% | 0.03128767% |
| October–December 2024 | 7.38% | 0.02016393% | 11.38% | 0.03109290% |
| July–September 2024 | 7.36% | 0.02010929% | 11.36% | 0.03103825% |
Common questions
What is the ATO shortfall interest charge rate?
7.51% a year (0.02057534% a day) for October–December 2026. It was 7.43% for July–September 2026.
What is the ATO general interest charge rate?
11.51% a year (0.03153425% a day) for October–December 2026.
What's the difference between GIC and SIC?
SIC applies when your tax return is amended and there's a tax shortfall, because you usually didn't know about it until the amended assessment. GIC applies to tax and other amounts not paid by the due date, underestimated instalments and late returns. GIC is 4 percentage points higher.
See also the first home super saver calculator (FHSS earnings use the SIC rate) and the tax refund calculator.
Sources: ATO shortfall interest charge rates and general interest charge rates. Checked 22 October 2026. An estimate; the ATO calculates the charge on your account.