Indefinite maintenance is spousal maintenance without a fixed end date. It terminates on death, remarriage, or other qualifying events and can be modified if circumstances change substantially unless made non-modifiable by agreement.

Indefinite maintenance is appropriate in cases where self-sufficiency is genuinely not a realistic expectation given the receiving spouse's age, the length of the marriage, and the income gap.

A negotiated non-modifiable agreement with a defined structure is almost always a better outcome than indefinite court-ordered maintenance for both parties.