Alberta Seniors Property Tax Deferral Interest Rate
One of the first questions every Alberta homeowner asks about the Seniors Property Tax Deferral Program is what the loan will cost them over time. The answer hinges on two facts that set this program apart from commercial lending: the interest is simple (not compound), and the rate is pegged to the provincial borrowing rate rather than retail mortgage pricing.
The Current Rate
As of April 1, 2026, the SPTDP interest rate is 4.45% per annum, charged as simple interest. The rate is variable — the Minister of Assisted Living and Social Services sets it semi-annually on April 1 and October 1, in consultation with the Minister of Treasury Board and Finance. Historically the formula has been the provincial borrowing rate, roughly Prime minus 2%.
Rate changes apply to your entire outstanding balance, not just new advances. You receive updated figures in your semi-annual loan statement every April and October.
Simple vs. Compound: Why It Matters
With compound interest, unpaid interest gets added to your balance and you start paying interest on the interest. That is how credit cards and reverse mortgages grow so quickly.
The SPTDP works differently. Interest accrues on the tax advances the province disbursed to your municipality, but not on accumulated interest. Each new advance adds to the principal; interest never compounds.
The formula is straightforward: Interest = Principal × Rate × Time
On a $4,000 tax bill at 4.45%, one year of interest is $178. After three years of deferring (assuming 5% annual tax growth), the numbers look like this:
| Year | Tax deferred | Cumulative principal | Year's interest | Total interest |
|---|---|---|---|---|
| 1 | $4,000 | $4,000 | $178 | $178 |
| 2 | $4,200 | $8,200 | $365 | $543 |
| 3 | $4,410 | $12,610 | $561 | $1,104 |
After three years you owe $13,714 total — $12,610 in deferred taxes plus $1,104 in accumulated simple interest. Under a compound structure at the same rate, the balance would be higher because each year's interest would itself generate interest.
What Happens if the Rate Changes
Rate resets on April 1 and October 1 apply to your full outstanding balance going forward. If the rate drops from 4.45% to 3.90% at the next reset, all future daily interest accrual on your existing balance uses the lower rate. The reverse is also true — a rate increase means higher daily accrual from the reset date onward.
If you stop qualifying for the program while still carrying a balance (for example, you move out of the home but do not sell), the rate converts to Prime plus 2%.
Free Download
Get the Alberta Seniors Tax Deferral Application Checklist
Everything in this article as a printable checklist — plus action plans and reference guides you can start using today.
Voluntary Payments
You can pay down any portion of the loan at any time with no prepayment penalty. Payments apply first to accrued interest, then to principal. Even small voluntary payments reduce the balance that future interest is calculated on, which can make a meaningful difference over a 10-year deferral.
Comparing to Alternatives
A CHIP reverse mortgage (the main commercial alternative in Canada) compounds interest. HomeEquity Bank's posted rate page lists a $150,000 example at 6.34%, with rates dated August 31, 2026; rates depend on the term and offer. Over a decade, the difference between 4.45% simple and 7% compound on the same principal is substantial. That comparison is one reason a post on r/PersonalFinanceCanada noted: "Every time I see a CHIP reverse mortgage ad on TV I want to tell people about Alberta's Seniors Property Tax Deferral Program."
For a printable interest projection worksheet covering 1-year through 10-year deferral scenarios, see our Alberta Seniors Property Tax Deferral guide.
Get Your Free Alberta Seniors Tax Deferral Application Checklist
Download the Alberta Seniors Tax Deferral Application Checklist — a printable guide with checklists, scripts, and action plans you can start using today.