A lease term does two jobs. It puts a floor under how long the tenant stays, and it decides which month the unit comes back to market. The second job is the one that costs money, because the month you re-lease in decides how long the unit sits empty. That is why the answer is not automatically twelve.
Check what the end of a term does where your unit is
The same twelve-month lease produces a different outcome in each province.
- Ontario. If a fixed term ends and has not been renewed or terminated, the landlord and tenant are deemed to have renewed it as a monthly tenancy on the same terms, under section 38 of the Residential Tenancies Act. The tenancy carries on.
- British Columbia. Same result. At the end of a fixed term the agreement automatically becomes a month-to-month tenancy, and a clause requiring the tenant to vacate at the end of the term is allowed only in limited circumstances, set out in Policy Guideline 30.
- Alberta. A fixed term ends on the date stated in the agreement, and neither party has to give notice to end it.
So in Ontario and BC a term is a floor, not a ceiling. If your reason for choosing a short term is that you want the unit back at the end of it, that reason holds in Alberta and not in the other two. Check your own province.
A shorter term does not move the rent increase forward
The waiting period between increases runs from the last increase or the start of the tenancy. The lease has nothing to do with it.
- Ontario requires that at least 12 months have elapsed since the last increase for that tenant, or since the unit was first rented to them, and the tenant gets at least 90 days written notice (sections 119 and 116).
- British Columbia allows one increase every 12 months, with at least three full months notice.
- Alberta requires a minimum of 365 days since the last increase or the start of the tenancy, whichever is later, and allows no increase during a fixed term at all.
Two things follow from that. A nine-month term in Ontario or BC buys you no earlier increase, because the twelve-month clock keeps its own schedule. And a twenty-four-month term in Alberta holds the rent flat for two full years, because the 365th day falls inside the term. In Alberta, term length and rent strategy are one decision. In Ontario and BC they are two.
Pick the expiry month first, then count backwards
Term length is an output, not an input. Work it in this order.
- Rank your own months. Pull every lease you signed in the last two or three years. For each one, record the month the unit was listed and the number of days until a signed lease. You now know which months fill fast and which ones drag. Use your own units. A city-wide average will not describe a three-bedroom on a quiet street.
- Name a target expiry month. Choose the month your vacancies fill fastest, then set the expiry so the unit is available at the start of it rather than the end.
- Count the months from move-in to the next target. That number is the term. Anything from nine to eighteen months is ordinary, and nothing requires a round twelve.
- Return to twelve after that. Once the expiry sits in the target month, every following term of twelve or twenty-four months keeps it there.
- Write the increase date separately. Put the anniversary of the tenancy start on the calendar, not the lease expiry. That is the date your notice period counts back from.
A worked version. The unit comes available November 1, and your records show July fills in about twelve days while November takes closer to thirty. A twelve-month term keeps you re-leasing in the fall forever. A nine-month term ending July 31 moves the expiry once, and every term after it stays there. At a rent of $2,000, eighteen fewer vacant days is roughly $1,200 of rent at every future turn.
In Ontario and BC the one-time cost of that nine-month term is small, because the tenancy continues either way. In Alberta it is real: you have created an actual expiry three months earlier, so decide in advance what happens on that date.
When to go longer than twelve
Go longer when the turn is expensive or the unit is slow to lease. A furnished suite, a high-rent unit with a narrow audience, or a unit that needs two weeks of make-ready work all pay for a second year of certainty. A soft market is the other case. If you would rather bank occupancy than chase rent, a twenty-four-month term at today's rent is a fair trade in Ontario and BC, where you can still take the annual increase during the term. Price that trade differently in Alberta, where you cannot.
When to go shorter than twelve
Go shorter for a reason with a date attached: moving the expiry into your target month, a renovation you have already scheduled, or a demand cycle that is not twelve months long, such as a student unit leased September to April.
One common reason does not hold up. A short term is not a trial period for an applicant you are unsure about. In Ontario and BC the tenancy continues past the expiry either way, so the short term gives you nothing but an earlier date on which the tenant may leave. If an application worries you, resolve it during screening.
The quiet benefit of a fixed term
Notice timing. In Ontario a tenant ending a fixed term has to give notice at least 60 days before the expiration date in the agreement, effective on that date (section 44). A monthly tenant also gives 60 days, but the effective date can be the last day of any rental period, so the notice can arrive in any month of the year, including your worst one. A fixed term gathers departures into a window you chose. That is worth something even where the tenancy legally continues afterward.
The short version
Three numbers decide this, and you already have two of them: the month your units lease fastest, the cost of a vacant day, and the date the increase clock next allows. Term length falls out of those three. Work it once per unit, write the two dates on the calendar, and the next lease takes a minute.