Managing Tax and Cash Flow After a High-Income Year

November 2, 2026

Personal tax income is not always consistent. If you sold land, liquidated investments, or experienced a unique financial event, your income can vary greatly from one year to the next.

When you hit a high-earning year, it often raises questions about how to manage your tax obligations the following year—especially if your current income has dropped. Fortunately, Canada Revenue Agency (CRA) rules provide options to help protect your cash flow.

  1. Understanding CRA Tax Instalment Reminders

If your personal net tax owing was over $3,000 in the previous year, the CRA will automatically issue instalment reminders. Because their system assumes your income will remain the same, they will request payments that match your previous high-tax bill.

Depending on your actual outlook for the current year, you have three ways to respond:

  • If you expect a very low-income year: If your current tax bill will be covered by source deductions or personal tax credits—resulting in less than $3,000 owing—you can safely ignore the instalment requests. The CRA will not charge interest or penalties if your actual tax owing for the current year remains under the $3,000 threshold.
  • If you will owe tax, but less than last year: You do not have to pay the full amount the CRA requests. Instead, we can estimate your current year’s income and calculate a reduced instalment amount. We frequently collaborate with our clients and their investment advisors to build mid-year income projections. The goal is to have you pay just enough to cover your expected obligation and avoid instalment interest, while freeing up vital cash flow. Even if the actual results from the year vary slightly, the risk of paying high instalment interest is mitigated by making a reasonable payment.
  • If you expect an even higher-income year: You only need to pay the instalment amounts the CRA originally requested. Even if your final tax bill ends up being much higher, your instalment requirement is legally capped at the previous year’s amount. You will not face interest or penalties for the difference, though you will need to pay the by April 30.
  1. Managing the OAS Clawback and Pension Withholdings

If you receive Old Age Security (OAS), a high-income year can trigger the OAS recovery tax (clawback). Once again, the CRA assumes the current year will mirror the last, prompting Service Canada to automatically withhold tax directly from your monthly pension cheques starting in July.

If your income has already dropped back down, you have two strategic options to manage this:

  • Option A: Do nothing and collect the refund later. You can allow Service Canada to withhold the tax, claim the total amount withheld on your next tax return, and receive it back as a lump-sum refund. If you do not rely on that monthly income for immediate living expenses, this is often the simplest approach.
  • Option B: Reduce the withholding at source using Form T1213(OAS). If monthly cash flow is a priority, you can submit a Request to Reduce Old Age Security Recovery Tax at Source to the CRA. This form requires an estimate of your current year’s gross income, deductions, and credits. Once approved, the CRA instructs Service Canada to reduce or eliminate the monthly withholding.

Timing Note: The OAS cycle runs from July 1 to June 30 of the following. Due to the time required to process Form T1213(OAS) after filing, it is best to submit this paperwork as early in the year as possible to minimize unnecessary withholdings.

If you have questions about your instalment reminders, need assistance preparing an income projection, or want help filing Form T1213(OAS), please reach out to , we would be happy to help.