How does the limitation period work for a contract that is paid or breached in instalments in Ontario?

For a contract involving payments or obligations due in instalments, Ontario's discoverability analysis under the Limitations Act, 2002 is generally applied separately to each missed instalment, rather than treating the whole contract as breached, and time-limited, from a single date. This means that if a debtor misses several payments over time, a creditor may still be able to sue on the more recent missed instalments even if a claim based only on the earliest missed payment would now be out of time, since each instalment's non-payment can be treated as its own discoverable event.

This approach reflects the practical reality that a party to an instalment contract is often reasonably entitled to wait and see whether the other side catches up, rather than being forced to treat every single missed payment as an immediate, separate lawsuit the moment it happens. That said, exactly how a specific instalment arrangement is treated can depend on the contract's own terms, including whether it contains an acceleration clause that lets the entire remaining balance become due immediately upon a missed payment, which can change how the limitation analysis applies. Reviewing the specific contract language is important before assuming how the clock runs for a particular instalment arrangement.