Rent versus buy calculators are having a moment again. Punch in a price, a rent, a return assumption, and the tool tells you which side of the line you fall on.

Every one of them is built for the same person: someone who does not own a home yet.

But if you are 65 and mortgage-free, that is not your question. You already own it. The question is no longer "should I buy?" It is "what is it worth to keep?" And that flip carries a tax dimension the twenty-something version of the question never has to deal with.

You already answered the rent vs buy question. Decades ago.

The standard calculator compares a down payment invested in markets against the same money sunk into a house. That comparison only makes sense when the money is still liquid and the decision is still in front of you.

Yours is not. The money went into the house, the mortgage is gone, and the asset is sitting on your balance sheet producing no income at all while it costs you property tax, insurance, and maintenance every single year.

So the real retirement question has three parts. What does keeping it cost you in cash flow? What would selling it release as investable capital? And what does that released capital do to your tax bill for the rest of your plan?

Only the third part is genuinely hard. It is also the part almost nobody writes about.

There are three paths, not two

Framing this as "keep it or rent" skips the option most Canadians actually take. There are three:

• Path A: stay and keep it. The home stays in your net worth, the ongoing costs stay in your budget, and no new capital enters your investment accounts.
• Path B: sell and buy smaller. You release the difference between what you sell for and what you buy, minus transaction costs. Ongoing costs usually drop but rarely disappear, especially with condominium fees.
• Path C: sell and rent. The full net proceeds become investable capital. Housing costs become a single monthly rent line that rises with inflation.

Which one do Canadians say they want? A RE/MAX Canada survey of more than 1,500 adults, fielded 30 March to 1 April 2026, found that among respondents aged 65 and over, 57% intend to stay in their current home, 16% plan to downsize within 10 years, 17% plan to rent, and 9% are unsure. Roughly half said there are too few smaller homes available where they live.

Two things to keep in mind about that data. It is a real estate brokerage survey rather than Statistics Canada, and it measures intention, not behaviour. What people say at 65 and what they do at 78 are different data sets.

Still, the shape is useful. The majority intend to stay, and a meaningful minority are seriously considering renting. The constraint many of them name is not money. It is inventory. If there is nothing smaller to buy in your own neighbourhood, Path B quietly collapses into Path C.

On the rent side: the national average asking rent was $2,037 in July 2026, down 4.0% year over year, the 22nd consecutive month of annual decline, according to the Rentals.ca and Urbanation National Rent Report. Vancouver was the most expensive market at $2,677.

Read that figure carefully. Those are asking rents on new listings, not what sitting tenants pay. If you rent and stay put, your rent is set by your lease and your province's rules, not by the national average. Use a real local quote in your plan, not a headline number.

The tax point the calculators skip

Here is the part that makes the retirement version of this question different.

When you sell your home in Canada, the gain is generally tax-free under the principal residence exemption, the rule that shelters the capital gain on a property you ordinarily inhabited for each year you designate it. That is genuinely unusual. Almost nothing else in the Canadian tax system lets decades of appreciation come out untaxed.

Tax-free is not the same as paperwork-free. The sale still has to be reported on Schedule 3 of your return and the property designated on Form T2091(IND). Skipping the designation is one of the more common and more avoidable filing errors on a retirement-year return.

One caveat worth naming if you have ever rented out part of your home: claiming capital cost allowance (CCA, the tax depreciation you can deduct against rental income) on the rented portion can cost you the principal residence exemption on that portion. Most people who rented a basement suite and never claimed CCA are fine. If you claimed it, get the designation checked before you list.

But the sale is not where the real tax effect lives. The tax effect is everything that happens after the sale.

A paid-off house generates no taxable income. Invested proceeds do: interest, dividends, and realized capital gains, every year, for the rest of your plan. That income counts toward net income, and net income is what drives two things that matter a great deal after 65.

The first is Old Age Security (OAS) recovery tax, better known as the clawback. For the July 2026 to June 2027 payment period, the threshold is $93,454, based on your 2025 net income. Above it, the recovery tax takes 15 cents of OAS for every dollar of net income over the line. A larger non-registered portfolio pushes taxable income up, which moves you toward that threshold.

The second is drawdown sequencing, the order in which you pull from each account. A bigger non-registered pool can mean you need less from your Registered Retirement Income Fund (RRIF, the account your Registered Retirement Savings Plan or RRSP must convert into by the end of the year you turn 71). Less RRIF income means less fully taxable income. So the proceeds push taxable income up in one place and can pull it down in another.

Those two forces run in opposite directions. Which one wins depends entirely on your numbers. That is why this is a modelling question and not a rule-of-thumb question.

A modelled scenario: Dale and Marie, both 67

This is a scenario, not a customer. The inputs are round and deliberately kept in one province, because land transfer tax, property tax rates, and rent rules all differ across the country.

Consider Dale and Marie, both 67, retired two years ago, living in a mid-sized Ontario city.

• Home: mortgage-free, worth about $750,000 (their number, not a market average)
• Ongoing home costs: roughly $900 a month in property tax, insurance, and maintenance
• Combined RRSPs: $620,000, not yet converted to RRIFs
• Combined TFSAs (Tax-Free Savings Accounts): $120,000
• Non-registered: $80,000
• CPP (Canada Pension Plan) and OAS: both started at 65
• Target after-tax spending: $75,000 a year
• No pension income on either side

They love the house. They also notice that it eats about $11,000 a year and gives back nothing in cash flow. Their children are in two different provinces. Nothing is forcing a decision.

So they want to see all three paths before they feel anything about them.

What each path changes

Here is what moves in the plan, and in which direction. Not the outcome, the mechanism:

Notice what the table does not contain. It does not say which path wins, because you cannot know that from the structure alone. You can only know it from the numbers, run year by year across both spouses and the full plan horizon.

What the structure does tell you is where to look. For Dale and Marie, the pressure point is the gap between now and 71. Four years with no pension income, no RRIF minimums yet, and a lot of flexibility about which account funds the grocery bill.

Path C hands them a large non-registered pool right in the middle of that window. That has a real upside: it can let them pull RRSP money forward at lower rates before RRIF minimums arrive. It also has a real cost: more annual investment income competing for room under the OAS threshold, for both of them, for the rest of the plan.

Two effects, opposite signs, same decision. That is exactly the kind of question Optiml exists to settle, because the answer changes if you move the sale year, the rent, or the CPP and OAS start ages.

What to put in your own plan

This is the part you can act on this week. In Optiml, the home is not a footnote; it is an asset inside the plan, and the sale is an event the plan reorganizes itself around.

• Enter the home as an asset, at your own estimate of its value, not a market average.
• Set a sale year. Then move it. Selling at 68 and selling at 78 produce different drawdown orders, because they land in different parts of your tax life.
• Choose the replacement. Optiml supports up to five downsize or upsize events, plus a rent-after-sale option, so Paths B and C are both modellable rather than theoretical.
• Use a real rent quote from the building or neighbourhood you would actually move to, not the national asking average.
• Account for transaction costs. RE/MAX's own material puts moving costs at roughly 15% of sale proceeds. Treat that as their estimate, not a rule, but do not model the gross sale price as if all of it lands in your accounts. Land transfer tax on a replacement purchase, legal fees, commission, and the move itself all come off the top.
• Keep the ongoing costs honest. Property tax, insurance, and maintenance are fixed expenses in Optiml, and they inflate. Rent inflates too. Living expenses are customizable, so you can shape them around the Go-Go, Slow-Go, and No-Go phases rather than assuming flat spending for thirty years.
• Then let the plan reshuffle. Once the proceeds enter as investable capital, Optiml re-sequences the withdrawal order across your RRSP, RRIF, TFSA, and non-registered accounts, year by year, around your full tax picture.

If you are on Pro+ or Legacy, build all three as separate plans and put them side by side in Compare Plans. That is the version of this exercise that actually resolves the argument at the kitchen table, because you stop debating preferences and start reading outcomes.

Common questions

Is the sale of my house taxable in Canada?

Generally no, if it was your principal residence for every year you owned it. The principal residence exemption shelters the gain. You still have to report the sale on Schedule 3 and designate the property on Form T2091(IND). If you claimed capital cost allowance on a rented portion, that portion may not qualify.

Does selling my house affect OAS?

The tax-free sale itself does not create net income. What affects OAS is what the proceeds do afterward. Invested proceeds generate interest, dividends, and realized capital gains each year, and that income counts toward the net income used for the OAS recovery tax. For the July 2026 to June 2027 payment period, the threshold is $93,454 based on 2025 net income, with recovery tax of 15% on net income above it.

Should I downsize or rent in retirement?

There is no universal answer, and anyone who gives you one without your numbers is guessing. Staying keeps equity but keeps the carrying costs. Downsizing releases some capital and lowers but does not eliminate ownership costs. Renting releases the most capital and converts housing into a single inflating expense. The right path depends on your account mix, your spending target, and how close your net income sits to the OAS threshold.

What happens to my RRIF withdrawals if I sell the house?

RRIF minimums are set by your age and your account balance, so the sale does not change the minimum. What changes is everything above the minimum. With a larger non-registered pool funding your spending, you may draw less from the RRIF, which lowers your taxable income. Whether that is better than the alternative depends on how the new investment income interacts with your brackets and your OAS. That is a sequencing question, and it is answerable.

The Bottom Line

The rent versus buy calculator was never built for you. It answers a question you settled thirty years ago, with assumptions that stopped applying the day the mortgage cleared.

Your version is harder and more interesting. You are not choosing between two assets. You are choosing what role a paid-off house plays inside a tax plan that runs for decades, and whether the capital locked inside it does more work somewhere else.

Stay, downsize, or rent. Any of the three can be right. The mistake is deciding on feel and then hoping the math agrees.

Put the house in the plan. Set the sale year. Run all three.

It isn't about whether you should sell. It's about knowing what selling would actually do.