Ontario Tax Interest Rates with Quarterly Resets

Tax interest rates are published by the Government of Ontario's Ministry of Finance. The dataset contains historical rates, which are compounded daily and reset every three months. It was last updated on February 25, 2026.

Use Cases

• Calculate interest owed on late tax payments using the published rate for taxes owed (e.g., 8% for Q1 2026).
• Model interest accrued on tax overpayments using the distinct rate for refunds (e.g., 2% for Q1 2026).
• Analyze quarterly trends in tax interest rates over time for policy impact assessment.
• Determine interest for International Fuel Tax Agreement (IFTA) late payments or refunds using the specified rate (e.g., 5%).
• Calculate interest for Non-Resident Speculation Tax (NRST) rebates based on the 40-business-day accrual rule and applicable rates.

Strengths

• Rates are reset and published quarterly, providing regular updates.
• Specific rates are provided for distinct tax scenarios (e.g., owed, overpaid, appeals).
• Historical data is available for trend analysis.

Limitations

• The exact number of historical data points (rows) and date range are unknown.
• Data is specific to Ontario, Canada, limiting geographic applicability.
• Sample data and column structure are not provided for immediate validation.

Provenance

Source

Government of Ontario, Ministry of Finance.

Collection Method

Officially set and published by the provincial ministry.

Time Range

Historical periods available; current rates cover January 1, 2026 to March 31, 2026.

Freshness

Updated quarterly; last update was February 25, 2026, for the Q1 2026 period.

Geography

Province of Ontario, Canada.