Understanding the Top-up Tax Credit in Canada

The Top-up Tax Credit is a federal non-refundable tax credit introduced for the 2025 taxation year. It was created to ensure that taxpayers claiming large amounts of federal non-refundable tax credits continue to receive the intended level of tax relief after the reduction of the lowest federal personal income tax rate from 15% to 14.5%.

Why Was the Top-up Tax Credit Introduced?

For 2025, the lowest federal personal income tax rate is 14.5%, and most federal non-refundable tax credits are also calculated using this rate. While this change reduces taxes for many Canadians, it may unintentionally reduce the value of non-refundable tax credits for individuals claiming significant credit amounts.

The Top-up Tax Credit was introduced to prevent this reduction and preserve the intended value of eligible federal non-refundable tax credits.

Who May Benefit?

The credit primarily benefits taxpayers whose total federal non-refundable tax credits are large enough to exceed the federal tax payable within the first tax bracket.

For the 2025 tax year:

• The first federal tax bracket applies to taxable income up to $57,375.
• The maximum federal tax payable within this bracket is $8,319.38.

If the value of a taxpayer's eligible non-refundable tax credits exceeds this amount, they may qualify for the Top-up Tax Credit.

How Is the Top-up Tax Credit Calculated?

The calculation compares the taxpayer's total federal non-refundable tax credits with the federal tax otherwise payable within the first tax bracket.

If the credit amount exceeds $8,319.38 (for 2025), the excess is multiplied by 3.45% to determine the Top-up Tax Credit reported on Line 34990 of the federal return.

Example

Suppose a taxpayer has taxable income of $98,000, claims CPP, CPP2, Employment Insurance premiums, the spouse amount, and eligible dependant credits.

If the taxpayer's total federal non-refundable tax credit base remains below the first federal tax bracket threshold, no Top-up Tax Credit is available on Line 34990.

Final Thoughts

The Top-up Tax Credit helps ensure that taxpayers with substantial federal non-refundable tax credits are not disadvantaged by the reduced lowest federal tax rate introduced in 2025. Although it applies only in specific situations, understanding how the credit works can help taxpayers and tax professionals accurately calculate federal tax credits and maximize available tax relief.