Alimony Calculator

How Alimony Is Calculated in the United States

Alimony (also called spousal support or spousal maintenance) in the United States is not governed by a uniform federal formula. Each state sets its own rules, and even within states, judges often have broad discretion. A handful of states use advisory guidelines or formulas; most leave the amount and duration largely to judicial discretion based on statutory factors.

Several states do use formula-based guidelines. Massachusetts caps alimony at 30-35% of the income difference. New York uses a formula for temporary support. California courts often reference the "40% rule" (recipient's post-support income + support should not exceed 50% of combined net income). Duration in most states is tied to the length of the marriage.

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Because alimony varies so dramatically by state — and even by judge — this calculator provides a general estimate only. Tax law changed significantly in 2019: for divorces finalized after December 31, 2018, alimony is no longer deductible for the payor or taxable for the recipient under federal law.

U.S. Alimony General Guidelines

Common Formula Approach (varies by state):
  Monthly Alimony = (Payor's Gross Monthly Income - Recipient's Gross Monthly Income) x 30-40%

Duration Guidelines (general):
  Under 5 years: up to 50% of marriage length
  5-10 years:    up to 60% of marriage length
  10-20 years:   up to 75% of marriage length
  20+ years:     potentially indefinite / long-term

Worked Example

Payor gross monthly income: $9,500/month ($114,000/year)

Recipient gross monthly income: $2,800/month ($33,600/year)

Monthly income difference: $6,700

Applying 35% formula: $6,700 x 35% = $2,345/month

Length of marriage: 14 years

Duration estimate: 75% of 14 years = up to ~10.5 years

Note: post-2018 divorce, no federal tax deduction for payor

Result

Estimated alimony: ~$2,345/month for up to 10.5 years

Alimony Guidelines by State Category

State	Approach	Details
Massachusetts	Formula-based; 30-35% of income diff	Duration capped by statute based on marriage length
New York	Formula for temporary; judicial for permanent	Temporary: 30% payor net minus 20% recipient net
Texas	No formula; capped at $2,500/mo or 20% income	One of the most restrictive states; rarely awarded
California	No statutory formula; judge has broad discretion	40% rule is a common benchmark, not a law
Florida	Abolished permanent alimony in 2023	Bridge-the-gap, rehabilitative, and durational types remain
Most other states	Factor-based; no formula	Judges weigh 10-15 statutory factors; highly unpredictable

Common Alimony Mistakes (U.S.)

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Not understanding the 2019 federal tax changeFor divorces finalized after December 31, 2018, alimony is no longer deductible for the payor under federal tax law, nor taxable for the recipient. This fundamentally changes the economics of support agreements made before 2019.

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Confusing temporary and permanent alimonyTemporary alimony (pendente lite) is paid during the divorce proceeding and is calculated differently from final alimony. Don't use one as a benchmark for the other.

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Ignoring state-specific caps and limitsTexas caps alimony at $2,500/month or 20% of gross income, whichever is less. Florida abolished permanent alimony. These statutory limits cannot be overridden by general formula estimates.

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Failing to include a modification or termination clauseWithout explicit language, alimony may continue even if the recipient remarries or cohabits. Most states automatically terminate alimony on remarriage, but cohabitation rules vary significantly by state.

Frequently Asked Questions

How is alimony calculated in the United States?

Unlike child support, there is no single federal alimony formula. Most judges start with 20–35% of the income difference between spouses, then adjust for marriage length, the recipient's ability to become self-supporting, and the marital standard of living.

Is alimony tax deductible in 2025?

For divorces finalized on or after January 1, 2019, alimony is no longer deductible by the payor and is not taxable income to the recipient under the Tax Cuts and Jobs Act. Pre-2019 divorces may still follow the old tax rules.

What states do not award alimony?

All US states allow alimony in appropriate circumstances. However, Texas limits alimony to specific situations (marriages over 10 years, disability, or domestic violence). Courts in all states have significant discretion.

How long does alimony typically last?

Duration depends on the type and length of the marriage. Short marriages (under 5 years) typically result in brief rehabilitative support. Long marriages (15+ years) may result in permanent alimony in some states, though most now favor time-limited orders.

How Alimony Is Calculated in the United States

Worked Example

Alimony Guidelines by State Category

Common Alimony Mistakes (U.S.)

Frequently Asked Questions

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Alimony Calculator

How Alimony Is Calculated in the United States

Worked Example

Alimony Guidelines by State Category

Common Alimony Mistakes (U.S.)

Frequently Asked Questions

Related calculators

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