How is alimony calculated?

There is no single national formula. Common approaches: (30-40% of payor gross income) - (20-30% of recipient gross income). Duration: often half the marriage length for marriages under 10 years; indefinite for 20+ year marriages. Courts have wide discretion.

For divorces finalized after December 31, 2018 (under TCJA): alimony is NOT deductible by the payor and NOT taxable income to the recipient. For pre-2019 divorces, the old rules (deductible/taxable) may still apply.

What factors affect alimony amounts?

Courts commonly weigh the length of the marriage, each spouse's income and earning capacity, the standard of living during the marriage, age and health, and contributions like homemaking. Guidelines and judicial discretion vary widely by jurisdiction.

How long does alimony last?

Duration varies. Short marriages may yield short-term or no alimony, while long marriages can lead to longer or, in some places, indefinite support. Many awards are temporary to help a spouse become self-supporting.

Can alimony be modified?

Often yes. A significant change in circumstances — such as job loss, a large income change, remarriage, or retirement — can be grounds to request a modification through the court. Some agreements are non-modifiable, so the terms matter.

Should I confirm with a family law attorney?

Yes. This calculator provides an educational estimate using simplified assumptions. Alimony depends on your jurisdiction's laws and a judge's discretion, so confirm any figure with a licensed family law attorney before relying on it.

What is the difference between alimony and child support?

Alimony (spousal support) is paid to support a former spouse, while child support is paid to cover a child's needs. They are calculated separately, have different tax treatment, and serve different purposes, though both can apply in one case.

Alimony Calculator — Spousal Support Estimator

How to use Alimony / Spousal Support Estimator

The alimony calculator estimates spousal support payment ranges using common formulas applied by family courts: the difference-of-incomes method and the percentage-of-income method. It also estimates duration based on marriage length guidelines. Alimony is fact-specific and court-discretionary; use this as a starting point for negotiation, not a substitute for legal advice.

Enter both spouses' gross annual incomes.
Enter the length of the marriage in years.
Select marriage type for duration estimate (short, medium or long).
Review the estimated monthly payment range and duration.

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Common alimony calculation formulas

No single national formula exists, but two approaches are widely used. Difference method: 30–40% of payor gross income minus 20–30% of recipient gross income. Example: payor $120k/yr → $40k × 35% = $42k minus recipient $40k/yr × 25% = $10k → $32k/yr alimony ($2,667/mo). Percentage method: 20–30% of the income difference. Courts adjust for standard of living, contributions to marriage, health, and self-sufficiency potential.

Alimony duration guidelines by marriage length
Marriage length	Typical duration	Notes
< 5 years	Up to half of marriage length	Rehabilitative focus
5–10 years	Half to 70% of marriage length	Transitional / rehabilitative
10–20 years	Varies widely by state	May include long-term or modifiable
20+ years	Indefinite or until remarriage	Courts often award longer-term support

Factors courts consider

Courts weigh: length of marriage; each party's earning capacity and education; interruption of career for homemaking or childcare; standard of living during marriage; age and health; contributions to the other's career or education; and marital misconduct (in fault-based states). Alimony is taxable income to the recipient and deductible to the payor for pre-2019 agreements; post-2019 TCJA agreements are no longer deductible.

Worked examples

Payor $120k, recipient $40k (illustrative)

Inputs: 35% × $120k − 25% × $40k

Result: ≈ $32,000/yr ($2,667/mo) — state rules differ

Percentage-of-difference method (illustrative)

Inputs: 25% × ($120k − $40k income gap)

Result: ≈ $20,000/yr ($1,667/mo) — illustrative only

Duration estimate, 12-year marriage

Inputs: guidelines: ~half of marriage length

Result: ≈ 6 years (illustrative — court discretion varies)

Glossary

Rehabilitative alimony: Time-limited support while a lower-earning spouse re-enters the workforce.
Permanent alimony: Open-ended support typically reserved for long marriages where one spouse cannot achieve self-sufficiency.
Modification: A court-approved change in alimony amount or duration following changed circumstances.
Imputed income: Income a spouse could earn if employed; courts may use this rather than actual income.

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Alimony / Spousal Support Estimator

How to use Alimony / Spousal Support Estimator

Common alimony calculation formulas

Factors courts consider

Worked examples

Glossary

Related reading

Frequently Asked Questions

Why use Alimony / Spousal Support Estimator?

Common use cases

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