Paycheck Boost (T1213) Calculator
Estimate your increased monthly cash flow in 2026 by reducing tax withholding at source.
What is a T1213?
By default, your employer calculates your taxes as if you have no deductions. If you contribute $1,000 a month to an RRSP, you'll eventually get a big refund, but you're giving the government an interest-free loan in the meantime.
CRA Form T1213 allows you to ask the CRA to give your employer permission to deduct LESS tax from your paycheck right now, based on the deductions you'll claim at year-end.
How to Use This Calculator
- Estimate Annual Deductions - Include your planned RRSP deposits, childcare expenses, and any investment interest paid.
- Calculate the Boost - See exactly how much your bi-weekly or monthly paycheck will increase.
- File with CRA - You must file this form every year, ideally in November or December for the upcoming year.
Calculation Formula & Example
The Formula
Monthly Boost = (Total Annual Deductions × Marginal Rate) / 12
Where:
- Annual Savings = The total refund you would have received in April.
- T1213 Approval = CRA usually takes 4-8 weeks to process the request.
Example Calculation
If you contribute $24,000/year to an RRSP and your tax rate is 40%, you save $9,600/year. A T1213 approval adds $800 per month directly to your take-home pay.
Benefits of Using This Calculator
- Improved Cash Flow - Have the money in your pocket throughout the year for bills or reinvesting.
- Dollar Cost Averaging - Reinvest your 'refund' every month to get more time in the market.
- Interest-Free Government Loan - Stop lending money to the government for 0% interest.
Calculator Use Cases
If you have a monthly auto-deposit, this tool is vital for your efficiency.
Childcare expenses are a major deduction that can stay in your wallet month-to-month.
Frequently Asked Questions
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