The BRRRR Calculator Real Investors Actually Use

Where BRRRR deals actually fail

The BRRRR strategy is arithmetically simple and operationally unforgiving. Buy below market, renovate to force appreciation, rent to stabilise income, refinance to recover your capital, then repeat with the same money. Every step is straightforward. The failures cluster in three places, and all three are modelling problems before they are execution problems.

The first is the after-repair value. The entire strategy depends on the finished building appraising high enough that a refinance returns your capital. Investors routinely assume the ARV they hope for rather than the one comparable sales support. If the appraisal lands ten percent low, the refinance returns materially less than planned and the capital you intended to recycle stays trapped.

The second is the refinance constraint itself. Borrowers model the maximum loan-to-value the lender advertises and forget that debt coverage usually binds first. A building that appraises well but produces thin income will be sized down to what its net operating income can service — and at higher interest rates, that ceiling falls sharply while the LTV ceiling stays put.

The third is the carry. Renovation always runs longer than planned, and every additional month is mortgage interest, taxes, insurance and utilities on a building generating no rent. A model that assumes a tidy ninety-day renovation and an immediate refinance is not a model — it is a hope with a spreadsheet attached.

Modelling the refinance honestly

The refinance is the step that determines whether the deal works, so it deserves the most scrutiny. Three constraints apply simultaneously and the tightest one governs: the loan-to-value ceiling against the new appraised value, the debt coverage minimum against stabilised net operating income, and the lender's seasoning requirement determining when you may refinance at all.

Run the refinance at several ARV assumptions rather than one. If the deal only recovers your capital at the optimistic appraisal, you have a fragile deal — and fragility is worth knowing about before you commit, not after the appraiser has been through.

It is also worth modelling what happens if you cannot fully recover your capital. Leaving twenty or thirty thousand dollars in a deal is not a disaster if the property cash flows and you understood it going in. Discovering it at the refinance table, having already committed to the next purchase, is a different situation entirely.

What Canadian BRRRR investors need to model differently

Most BRRRR content is written for a US audience, and several of its assumptions do not transfer. Land transfer tax is a real and substantial acquisition cost in Canada, doubly so in Toronto where both provincial and municipal charges apply. It belongs in your total cash invested from the outset.

Rent control changes the stabilisation step in provinces that have it. In Ontario, rents on existing tenancies can only rise by the annual guideline, so the path to market rent generally runs through turnover rather than through raising rents on sitting tenants. A model that assumes an immediate move to market rent across every unit is not describing a legal outcome.

On residential buildings of five units or more, CMHC-insured financing changes the refinance maths considerably — higher advances and much longer amortisation, at the cost of premiums, program criteria and a longer timeline. If your building qualifies, model insured and conventional as separate scenarios rather than adjusting one into the other.

Finally, capital cost allowance is not the same as US depreciation, and recapture on sale can be a meaningful cost if you have been claiming it. That belongs in your exit modelling, not as an afterthought.