Alimony duration estimator

Estimates only. Alimony is one of the most discretionary areas of family law - judges have significant latitude even within guideline formulas. This calculator provides a general planning range. A family law attorney evaluates your actual case and state's specific approach. See our full disclaimer.

Alimony amount and duration estimator

Length of marriage (years)

State alimony approach

Higher-earning spouse's annual income ($)

Lower-earning spouse's annual income ($)

Lower-earning spouse's career situation

Recipient spouse's age

Recipient spouse's health

Your alimony estimate

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How marriage length determines alimony duration

Most states use marriage length as the primary factor in determining alimony duration, often expressed as a percentage or fraction of the marriage length. A common framework (though it varies significantly by state): short-term marriages (under 10 years) typically produce limited-duration or "rehabilitative" alimony lasting roughly 30% to 50% of the marriage length, intended to help the recipient become self-supporting. Mid-length marriages (10 to 20 years) often produce alimony lasting 50% to 100% of the marriage length. Long-term marriages (20+ years) frequently produce permanent, indefinite, or "durational" alimony with no fixed end date - though many states have moved away from truly "permanent" alimony in favor of long-term but still potentially modifiable support.

Several states have moved to formula-based alimony statutes that remove much of the judicial discretion - Florida's 2023 alimony reform, for example, eliminated permanent alimony entirely and capped duration based on marriage length tiers. Massachusetts has a similar durational formula tied to marriage length. Other states (notably New York, New Jersey, and Pennsylvania) retain broad judicial discretion with statutory factors but no fixed formula. Use the divorce settlement calculator for your full settlement picture alongside alimony, and the spousal support modification tool if you need to address changing an existing alimony order.

What is rehabilitative alimony and how is it different?

Rehabilitative alimony is time-limited support intended to give the recipient spouse the resources and time needed to become self-supporting - completing an education or training program, re-entering the workforce after a long absence, or building work experience. Unlike permanent alimony, rehabilitative alimony has a specific termination date or is tied to specific milestones (completion of a degree program, for example). Courts favor rehabilitative alimony when the recipient has clear earning capacity that simply needs to be developed, as opposed to situations involving age, disability, or such an extended absence from the workforce that full self-sufficiency isn't realistic.

What factors beyond marriage length affect alimony amount?

Beyond duration, the monthly amount depends on: the income gap between spouses (typically the larger driver of amount than duration), the marital standard of living (higher-income marriages support higher alimony even with smaller percentage gaps), the recipient's separate assets and ability to generate income from them, contributions to the paying spouse's career or education during the marriage, and the paying spouse's actual ability to pay after their own reasonable expenses. Most states use a formula range (commonly 20% to 35% of the income differential) as a starting point, with judges adjusting based on the specific facts.

Frequently asked questions about alimony duration

In most states, yes - the recipient spouse's remarriage automatically terminates alimony, based on the presumption that the new marriage provides financial support. This termination is typically automatic by statute and doesn't require a separate court motion in many states, though the paying spouse should formally document the remarriage to stop payments cleanly. Cohabitation (living with a new partner without marrying) is treated differently by state - some states also terminate or reduce alimony based on cohabitation if it demonstrates a similar level of financial interdependence, while others require remarriage specifically.

Generally yes, unless the alimony was specifically designated as "non-modifiable" in the settlement agreement (which some divorcing spouses negotiate for certainty). Modifiable alimony can be adjusted based on a substantial change in circumstances - significant income change for either party, retirement of the paying spouse, disability, or other major life changes. The process and standard mirror child support modification in many ways. Use the spousal support modification tool to evaluate whether your circumstances support a modification request.

For divorces finalized after December 31, 2018, alimony is NOT tax-deductible for the paying spouse and NOT taxable income to the recipient, under the Tax Cuts and Jobs Act. This reversed the prior rule (which applied to divorces before 2019) where alimony was deductible to the payer and taxable to the recipient. This tax law change significantly affects how alimony is negotiated - paying spouses lost the tax benefit that previously made larger alimony payments more affordable, which has influenced negotiation dynamics in divorces finalized since 2019.

Permanent alimony (no fixed end date, lasting until death, remarriage, or court-ordered termination) was historically common for long-term marriages but has been significantly curtailed in recent years. Several states (Florida as of 2023, for example) have eliminated permanent alimony entirely in favor of duration formulas. Other states still allow permanent or indefinite alimony for very long marriages (typically 20+ years) where the recipient cannot realistically achieve self-sufficiency due to age, health, or extended absence from the workforce - but even "permanent" alimony usually remains modifiable based on changed circumstances, distinguishing it from a truly fixed lifetime obligation.

Yes, and this is increasingly common, especially post-2019 when alimony lost its tax-deductible status for monthly payments. A lump-sum settlement (sometimes structured as additional property division rather than technically "alimony") provides certainty for both parties - the recipient gets guaranteed funds regardless of the payer's future financial situation, and the payer eliminates ongoing obligation and modification risk. The tradeoff is the lump sum is typically discounted compared to the total of all monthly payments, reflecting the time value of money and the certainty being provided. A financial advisor helps calculate a fair lump-sum equivalent.