If you own a rental property in Ontario, there is a good chance you pay down your personal debt with what is left after tax, while your rent pays the rental bills.
That is not a mistake. It is just the default nobody questions.
Rental cash damming changes how those two flows meet your debt. The rent you already collect becomes an additional prepayment on your home mortgage. Rental expenses are paid with funds borrowed from a separate line of credit used for nothing else. You do not need a bigger budget; you change which account pays which bill.
For the full strategy, start with our rental cash damming guide. This page covers what is specific to Ontario.
Why Personal Debt Is the Problem
Interest on borrowing used to earn rental income may be deductible. Interest on personal-use debt, like the borrowing on the home you live in, is not.
The reason is use. You borrowed to buy a home to live in. Interest on personal-use borrowing is not deductible, however large the balance.
Ontario balances show the cost, especially in the Greater Toronto Area. On $750,000 of personal-use debt at 4.5%, the first year's interest is about $33,000, all of it paid with after-tax dollars.
Rental expenses are different. Property tax, insurance, repairs, condo fees and management on a rental are paid to earn rental income. Under section 20(1)(c) of the Income Tax Act, interest on money borrowed for that purpose may be deductible, depending on the requirements of the Act and your circumstances.
Rental cash damming connects the two. Each month, personal-use debt is paid down and rental-use borrowing takes its place.
What Debt Conversion Means
Debt conversion means replacing personal-use borrowing with borrowing used for an income-producing purpose, one documented transaction at a time.
You start with two kinds of borrowing. The debt on your home is personal-use borrowing. A line of credit used only to pay rental expenses is rental-use borrowing.
Every month, rent pays down personal-use debt, and funds borrowed from the rental line pay the rental bills. Total debt stays roughly the same. What changes is what the debt was used for.
Two things follow. Your personal-use debt goes down sooner than its schedule. And the rental-use balance grows. Interest on that borrowing may be deductible, depending on the requirements of the Income Tax Act and your circumstances.
CRA's Income Tax Folio S3-F6-C1, Interest Deductibility, discusses how borrowed money is traced to its use (paragraphs 1.29 and 1.30), including keeping borrowed money in separate accounts (paragraph 1.34). That guidance explains how CRA reads the law. It is not approval of any plan or any implementation.
The rule is federal. Nothing in Ontario law changes how interest on borrowed money is treated, so the mechanics are the same here as in BC or Alberta. What differs is the rental market the strategy runs in.
How the Strategy Works in Practice
The mechanics need a specific account structure and a fixed monthly sequence. This is where do-it-yourself attempts usually slip.
Rental income lands in a dedicated rental income account. Nothing else touches it. From there, the rent is prepaid against the debt on your home.
With a readvanceable product, that prepayment opens up the same amount of room on a linked line of credit.
You draw from the line of credit into a dedicated rental expense account, and every rental bill is paid from there. The borrowed money goes to the expense account first, then to the specific bill. That order is what creates a clean record of what each borrowed dollar paid for.
The test looks at the direct use of borrowed money. If your records show every dollar drawn went to a rental expense, the interest on that borrowing may be deductible where the other requirements are met. If the trail is muddy, the deduction can be denied.
That is why the accounts and the sequence are set up on day one. Cleaning up a mixed line of credit after the fact is hard and sometimes impossible.
The strategy needs a product where paid-down principal readvances to a linked line of credit, with a separate line used only for rental expenses. Whoever handles your mortgage confirms whether yours supports it, and we coordinate with them.
For a step-by-step walk-through, read how cash damming works.
Ontario-Specific Considerations
Large balances across Ontario markets
High prices in the GTA mean large personal-use balances, and a larger balance means more for rent to pay down. The same applies, at different price points, in Ottawa, Hamilton, Kitchener-Waterloo and London.
Each market has its own rental profile. Condos dominate investor ownership in downtown Toronto. Investors in Hamilton and London often own older houses, duplexes and converted units. Kitchener-Waterloo and London have student rental demand around their universities. Ottawa's rental demand is anchored by a large public-sector workforce.
What matters for the strategy is steady rent, because steady rent is what drives the monthly prepayments. New condo supply can soften rents in a building or neighbourhood, so we plan around realistic rent, not peak rent.
Condo rentals and condo fees
Condo rentals fit well. Condo fees, special assessments, property tax, unit insurance and maintenance are rental expenses when the unit is rented, and each one is paid from the rental expense account like any other rental bill.
Condo fees are predictable, which makes the monthly routine easy to plan. In the GTA, fees on a rented unit are often several hundred dollars a month, a meaningful monthly flow through the rental line.
Many newer GTA condo rentals do not cover their own costs. That does not rule out the strategy, but the rental-use balance grows faster than your personal-use debt falls, so we model the shortfall on your numbers first.
Rent control and rent predictability
Ontario's rent increase guideline applies to most residential units first occupied before November 15, 2018. On those units, rent can rise each year only by the guideline amount, which is set annually and capped at 2.5%, unless the Landlord and Tenant Board approves an above-guideline increase. Units first occupied for residential purposes after November 15, 2018 are exempt from the guideline.
This matters because rent drives the prepayments. On a guideline unit with a long-term tenant, rent rises slowly and predictably, so the monthly prepayments stay fairly flat. On an exempt unit, rent can follow the market, up or down. Between tenants, rent on either kind of unit can generally be reset.
Neither case stops the strategy. It changes how much the rent pays down each year, and we build that into your plan.
Vacancies and the Landlord and Tenant Board
The Landlord and Tenant Board handles disputes between landlords and tenants, from non-payment to evictions. It does not touch your account structure, but a dispute can take months to resolve and interrupt your rent.
When rent is late or a unit is empty, that month's prepayment is simply skipped. The rental bills are still paid from the rental line, so the record stays clean.
Multiplexes and secondary suites
Ontario now permits up to three residential units on most residential lots with municipal services, and some municipalities, including Toronto, allow more. Basement apartments, garden suites and laneway suites are common ways Ontario homeowners add a rental.
When the rental unit is part of the property you live in, the property and its costs are generally split between personal and rental use on a reasonable basis, such as floor area. That split applies whether or not you run cash damming. Shared costs such as utilities, property tax, insurance and maintenance are split the same way.
Secondary suite and multiplex setups are among the most detail-sensitive we design. The monthly record keeping is heavier than with a separate rental, and it has to be right from the first transaction.
Short-term rentals
We don't work with short-term rentals. The strategy runs on steady monthly rent from long-term tenants, and short-term rental income is seasonal and depends on licensing rules that can change.
Property tax and purchase taxes
Ontario property tax rates vary by municipality. Property tax on a rental is a rental expense, so it is paid from the rental expense account like every other rental bill.
Ontario's land transfer tax, Toronto's municipal land transfer tax and the Non-Resident Speculation Tax are paid when a property is bought. They do not change the mechanics.
A history of refinancing
Many Ontario landlords have refinanced several times as prices climbed. Each refinance can mix personal and rental borrowing in one balance, especially if rental equity paid for personal things or the reverse. We review that history with you before anything moves, so the starting point is clear.
Who This Works For
Rental cash damming tends to fit Ontario landlords who:
- Own at least one rental property personally, not inside a corporation
- Carry personal-use debt on the home they live in, with at least 15 years left to pay it
- Have a household income above about $75,000
- Have a readvanceable product, or can get one
The rental does not have to be cash-flow positive. With a negative rental, funds borrowed from the line pay the expenses rent does not cover, so the rental-use balance grows faster than your personal-use debt falls. We model that shortfall on your numbers before you commit.
Not sure where you stand? Start with the eligibility checklist. For how the law is described, read is cash damming legal in Canada. If you also want to invest, compare cash damming and the Smith Manoeuvre.
What Freedom10 Delivers
The accounts, the monthly sequence and the record keeping need to be designed before the first dollar moves. A setup error does not just shrink the benefit; it can muddy the trail the strategy depends on.
We design the strategy together and help you set it up, implement it and track it. You run it. Here is what you get:
- A custom plan with step-by-step instructions, a money-flow flowchart, your bank account structure and a transaction map
- A video call walking you through the plan line by line
- A setup checklist so you know what to set up and in what order
- A Google Sheets tracking sheet
- Twelve months of support: up to three 30-minute calls a month for the first 90 days, then one a month
- Up to one hour with your own accountant at tax time
Setup usually takes four to six weeks. After that, most of the monthly transfers can be automated, and you follow the checklist.
See What Your Debt Could Be Doing
Watch our free masterclass. We walk through the strategy step by step with worked examples, including the large balances many GTA landlords carry.
This article is for educational purposes only and is not tax, legal or financial advice. Freedom10 does not prepare tax returns or give personalized tax advice, and how the strategies described here apply to you depends on your facts. You should always seek independent tax advice if you are thinking about implementing these strategies. Freedom10 is a financial strategy and education company.