Affordability is the heaviest scoring category in the program and the one that decides most files. It is also the one borrowers most often get wrong before they start.

Affordable in this program does not mean below market. It means the rent sits at or below 30% of the median renter household income for the market the building is in. That is an income test, not a rent comparison, and the distinction changes the whole calculation.
In a market where rents have moved far ahead of local incomes, which describes most of Metro Vancouver, the committed rent can land well below what the suite would otherwise achieve. In a market where the gap between rents and incomes is narrower, the committed rent may be close to what you were going to charge anyway, and the points are close to free. The first thing to work out on any file is which of those two situations you are actually in, because the answer determines whether the program is a bargain or an expensive way to buy leverage.
The commitment applies to a defined share of units, held for the commitment period, with the rents adjusted only as the program permits. It is not a one time discount at lease up. It is a rent ceiling on those units for a decade or more.
Points are earned by committing a share of units to affordable rents for at least 10 years. The share required depends on whether the building already exists.
Extending the commitment from 10 years to 20 adds 30 points. On a file that is sitting just under a tier, that extension is frequently the cheapest way over the line, and it costs nothing today. What it costs is optionality later, because the commitment travels with the building through a sale.
Compare the two columns above and the strategy writes itself. A ground up rental project reaches the qualifying 50 points by committing one unit in ten. An existing building has to commit four in ten for the same score. That is a four fold difference in revenue given up for identical points.
The practical consequence is that on new construction, affordability usually carries the file and energy and accessibility top it up. On existing buildings, the sensible order is often reversed: score what you can on energy, which is measured against the building's current performance and is therefore easier on an older asset, then add only as much affordability as the operating numbers can genuinely absorb. Pushing an existing 40 unit building to 80% committed units to chase 100 points is a decision that should be modelled over the full commitment period, not celebrated in a pro forma.
The energy points page covers the other side of that balance, and MLI Select for new construction goes into how a ground up file is put together.
The commitments are contractual conditions of the insurance, and reporting runs for the life of the agreement. You confirm the committed units, the rents charged on them and that the required share is being maintained. Turnover does not release a unit from the commitment. If a committed suite goes vacant, the replacement tenancy comes back in at the committed rent, not at market.
Breaching the commitment puts the insurance and the loan terms at risk, which is a serious position to be in when the loan was sized on 95% leverage and a 50 year amortization. This is not a program where the conditions quietly fade after funding. Treat the compliance calendar as part of operating the building.
This is where files fail later, and it fails quietly. The commitment gets set at the level that produces the desired point total, and the operating model that justifies it assumes minimal vacancy, low turnover and expenses that do not move. Then a real year happens. Insurance renews higher, property taxes move, a boiler goes, two suites sit empty for six weeks, and the building is locked into rents that cannot fund any of it.
The test we apply before anything is submitted is simple. Model the committed rents against realistic vacancy and a normal expense load, add a bad year, and check that debt service coverage still holds. The binding constraint on most BC files is not the leverage the points earn, it is what a 1.10 debt coverage supports at the rents the building can achieve. A tier you cannot operate at is worse than a lower tier you can, because the lower tier does not carry a decade of obligations you will spend that decade regretting.
A second practitioner note: build the evidence from signed leases and comparable transactions rather than from listings. Appraisers use the former. Rent assumptions built on asking rents get resized late in the process, and a late resize on an insured file costs weeks you do not have.
Send the rent roll or the pro forma. We will model the affordability tiers against realistic operations and tell you which one the building can live with.