Form T1198, the Statement of Qualifying Retroactive Lump-Sum Payment, is the document that lets the Canada Revenue Agency tax a large back payment as if you had received it in the years it actually relates to, rather than all at once. The payer fills it out. You file it with your return. The CRA then compares the regular tax on the lump sum with the tax you would have paid had the money arrived on time, and applies whichever result is lower.1Canada Revenue Agency. Qualifying Retroactive Lump-Sum Payments
Which Payments Qualify
Under section 110.2 of the Income Tax Act, the qualifying portion of the payment (interest excluded) must total $3,000 or more.2Justice Laws Website. Income Tax Act RSC 1985 c 1 (5th Supp) – Section 110.2 If the payment covers several years, the $3,000 floor applies to the combined principal, not to each year’s share. Every year the payment relates to must end after 1977, and you must have been a resident of Canada throughout each of those years.
The eligible income falls into four groups:
- Employment income received under a court order, tribunal judgment, arbitration award, or a settlement that ends a legal proceeding, including damages for loss of employment.
- Retroactive pension or superannuation benefits that replace periodic payments you should have received earlier.
- Wage-loss replacement benefits from an employer-funded plan and Employment Insurance benefits, as described in paragraphs 6(1)(f) and 56(1)(a)(iv) of the Act.
- Other amounts specifically prescribed by regulation.
Interest paid on top of the principal is always excluded from the qualifying amount and is taxed normally in the year you receive it.
Common Payments That Don’t Qualify
Back pay negotiated through ordinary collective bargaining is not eligible, even when it covers prior years.1Canada Revenue Agency. Qualifying Retroactive Lump-Sum Payments A new union contract with retroactive wage increases produces a lump-sum cheque that is taxed entirely in the year you receive it. Signing bonuses, retroactive salary increases outside a legal dispute, and severance packages that don’t flow from a legal resolution also fall outside the four categories. The relief is reserved for payments that arise from legal disputes, tribunal decisions, or settlements ending a proceeding.
How the Calculation Reduces Your Tax
The mechanics live in sections 110.2 and 120.31 of the Income Tax Act. First, the qualifying amount is deducted from your taxable income in the year you received it, so the lump sum doesn’t inflate your current bracket. Then the CRA works out what extra tax you would have owed in each prior year if that year’s share had been added to your income back then. It adds up those notional amounts across every eligible year and includes a notional interest component to reflect that the tax was not paid at the time. That total becomes the additional tax for the current year.
Because each slice of income is taxed at the marginal rate you were actually in during that period, the result is usually lower than stacking everything into one year. The CRA runs both calculations and charges the lower figure, so filing the form cannot leave you worse off.
Who Fills Out the Form
The payer completes Form T1198, not you.1Canada Revenue Agency. Qualifying Retroactive Lump-Sum Payments That will be your employer, former employer, insurer, or the government body that issued the money. The payer can also provide the same information in a signed letter if the official form is not used. Either way, the statement must show:
- The year the lump sum was paid.
- A description of the payment and the circumstances behind it.
- The total amount, split between principal and interest.
- How the principal breaks down across the current year and each prior year it covers.
The year-by-year breakdown is the piece that matters most. Without it, the CRA cannot run the notional tax calculation for each prior year. Check the allocation against your court order, settlement agreement, or tribunal decision before filing, because any error in the split flows directly into your final tax result. The current version of the form is available on the CRA website.3Canada Revenue Agency. T1198 Statement of Qualifying Retroactive Lump-Sum Payment
Filing It With Your Return
You can file electronically through EFILE or NETFILE even when reporting a qualifying retroactive lump-sum payment. Keep the completed T1198 in your records in case the CRA asks for it. If you file on paper, attach the form to your return.
You do not run the special calculation yourself. The CRA compares regular tax with the retroactive spreading method after receiving your return, and the outcome appears on your Notice of Assessment or, if the return is adjusted later, a Notice of Reassessment.
If You Filed Without the T1198
If you already filed and later realize the payment qualified, ask the CRA to reassess the year in question. Submit a T1-ADJ adjustment request or use the “Change my return” feature in My Account, and include the completed T1198 along with the supporting documents. The CRA generally has authority to reassess only within the normal reassessment period, so raising the issue quickly protects your ability to get the calculation applied. Waiting several years risks falling outside that window entirely.