How Long Does Alimony Last? Duration Rules by Marriage Length

The duration of alimony after divorce depends on three intersecting factors: how long your marriage lasted, which state (or country) governs your case, and whether the court considers the recipient spouse capable of becoming self-supporting. For marriages lasting 20 or more years — the territory where most gray divorces land — permanent or indefinite alimony becomes a real possibility.

The General Duration Framework

Most US states use the length of the marriage as the primary yardstick for alimony duration, though the terminology and formulas vary:

Short-term marriages (under 10 years): Courts typically award rehabilitative alimony for a limited period — often one-third to one-half the length of the marriage — to help the lower-earning spouse re-enter the workforce.

Mid-length marriages (10-20 years): Duration formulas become more generous. Many states allow alimony for 60-75 percent of the marriage length. The recipient's age and employment history start carrying more weight.

Long-term marriages (20+ years): Several states presume indefinite or permanent alimony for marriages exceeding 20 years, particularly when the recipient spouse is over 50 and has limited earning capacity. This is where gray divorce cases overwhelmingly fall.

State Variations That Matter

A handful of states illustrate how dramatically the rules differ:

Texas caps alimony at 5 years for marriages of 10-20 years and 7 years for marriages of 20-30 years. Even for marriages over 30 years, the cap is 10 years. Texas is among the most restrictive states for alimony.

Massachusetts introduced durational limits in 2012: alimony for a 20-year marriage can last no longer than 15 years (75% of the marriage length). But the law includes a "deviation" provision for cases involving advanced age or disability.

California uses a general guideline of half the marriage length for marriages under 10 years. For marriages of 10+ years (classified as "long duration"), there is no presumptive end date. Courts retain jurisdiction indefinitely.

New Jersey reformed its alimony law in 2014. For marriages under 20 years, alimony generally cannot exceed the length of the marriage. For marriages of 20+ years, courts can award "open durational" alimony with no fixed end date.

Florida eliminated permanent alimony in 2023. Even for long marriages, alimony is now durational with a cap of 75 percent of the marriage length.

When Alimony Becomes "Permanent"

Permanent alimony — now often called "open durational" or "indefinite" support — doesn't literally mean forever. It typically continues until:

• The recipient spouse remarries
• Either spouse dies
• The court modifies the order based on changed circumstances
• The paying spouse reaches full retirement age (an increasingly common termination trigger)

For gray divorce specifically, the paying spouse's retirement creates a natural inflection point. Many courts will reduce or terminate alimony when the payer retires, recognizing that a fixed pension or reduced Social Security income doesn't support the same level of payments.

The Tax Factor That Changed Everything

Before 2019, alimony was tax-deductible for the payer and taxable income for the recipient. This made higher alimony awards less painful for the payer (they got the tax break) and encouraged negotiation.

For divorce agreements executed on or after January 1, 2019, alimony is tax-neutral — no deduction for the payer, no taxable income for the recipient. This shifted negotiation dynamics significantly, particularly for high-income gray divorce cases where the tax savings previously amounted to tens of thousands of dollars annually.

Canada's Rule of 65

In Canada, the Spousal Support Advisory Guidelines use a formula that directly connects alimony duration to age. The "Rule of 65" provides that if your age at separation plus the years of marriage equals 65 or more, courts may order indefinite support. A 55-year-old divorcing after a 15-year marriage (55 + 15 = 70) likely qualifies.

Canada also uses the "Rule of 20" — any marriage lasting 20 or more years generally triggers indefinite support regardless of age.

What This Means for Your Settlement

If you're divorcing after a long marriage, alimony negotiations become a balance between current income needs and long-term sustainability. Lump-sum buyouts, structured step-downs, and pension-offset calculations can all shape the final outcome.

The Gray Divorce Guide includes a spousal support analysis worksheet that helps you model different duration and amount scenarios against your actual post-divorce budget, retirement timeline, and Social Security claiming strategy.