Legal calculator

Alimony Estimator, Spousal Support Amount & Duration

Estimate alimony (spousal support) amount and duration based on marriage length, income difference, and state guidelines. Educational estimates only.

According to the U.S. Internal Revenue Service and the National Institute of Standards and Technology, more than 1,000 published rate, threshold, and conversion reference values update annually across tax, mortgage, and engineering domains that CalcMesh formulas trace to. The CalcMesh registry listed 53 calculators across 9 categories as of August 2026. See our methodology for derivation standards and refresh cadence.

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Alimony is highly discretionary. Courts weigh many factors beyond income. This estimate is for planning purposes only.

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$
yrs

For rehabilitative/reimbursement alimony

Est. Monthly Amount

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Rough range midpoint

Monthly Range

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Low to high estimate

Est. Duration

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Months

Total Est. Alimony

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Over full term

How CalcMesh estimates alimony

There is no single national alimony formula; awards vary widely by state and by judicial discretion. We apply common guideline approaches, typically a percentage of the income difference adjusted for marriage length, to produce a rough range.

Because state law governs the actual award, our figure is an educational estimate only; the guideline assumptions we use are listed in our methodology. Consult a licensed family-law attorney.

Types of Alimony

  • Rehabilitative: Most common. Provides support while the lower-earning spouse retains job skills, completes education, or re-enters the workforce. Duration: 1-5 years typically.
  • Permanent: Long marriages where one spouse can't become self-supporting due to age, disability, or having been out of the workforce for 15+ years.
  • Reimbursement: Compensates a spouse who supported the other's education or career advancement (e.g., putting them through medical school).
  • Bridge-the-Gap: Short-term (usually ≤2 years) to help transition from married to single life.

Common Formula Approaches

Some states use guideline formulas as starting points:

  • Simple approach: 30% of higher earner's gross minus 20% of lower earner's gross
  • Duration rule: Duration = 1 year of alimony per 3 years of marriage (varies)
  • Need-based: Close the gap to 40% of combined marital income

Factors Courts Consider

  • Standard of living during marriage
  • Age and physical/emotional condition of each spouse
  • Duration of marriage
  • Contributions as homemaker/parent
  • Each spouse's earning capacity and education
  • Marital misconduct (in fault states)

Disclaimer: Alimony is highly discretionary. Courts apply multi-factor tests with wide latitude. This calculator provides rough estimates only. Consult a licensed family law attorney in your state.

Labelled scenario, income-gap formula path

Educational estimate only (courts are discretionary). Example inputs on a need-based style path:

  • Higher earner monthly $8,000, lower $3,000, marriage length band “long” as selected in the tool.
  • Combined = $11,000; a 40%-of-combined need target = $4,400; gap from lower income = $4,400 − $3,000 = $1,400/mo illustrative.
  • Duration multipliers in the tool scale with marriage-length band - short vs long changes months, not just dollars.
  • Fault/statutory caps are out of scope; the card is a formula sketch, not a prediction of a decree.

After you estimate

What to do with the numbers

  • Read the range card as sensitivity, not a guaranteed award.
  • Change marriage-length and type dropdowns one at a time to see which lever moves duration vs monthly.
  • Compare against your state’s statutory factors list - many are qualitative and not in any public formula.
  • Bring the worksheet to counsel; do not send an estimate as a demand letter.

Methodology & Assumptions

This statutory-estimate tool applies published model formulas to the incomes and allowances you enter. Court worksheets control real orders—this is orientation math only.

How this statutory-estimate node runs

Support and means-test estimators apply published model formulas to your stated incomes. Court worksheets control the real order. Published domain formulas govern the identities; when an agency updates rates or thresholds we refresh defaults and the page lastmod.

Frequently Asked Questions

How is alimony calculated?
There is no single federal formula. Most states use a multi-factor test weighing: length of marriage, income difference, standard of living, age and health, and contributions as a homemaker. Some states have formulas (e.g., 30% of higher earner's income minus 20% of lower earner's income). Courts have wide discretion.
Does fault affect alimony?
In fault states (about 30), adultery or other marital misconduct can affect alimony awards, a cheating spouse may receive less or none, or pay more. In no-fault states, fault doesn't matter. Consult an attorney about your state's approach.
Is alimony taxable?
For divorces finalized after December 31, 2018: alimony payments are NOT deductible by the payer and NOT taxable income to the recipient. This reversed decades of prior tax treatment. Divorces finalized before 2019 may still follow the old rules under the divorce agreement.
Can alimony be modified or terminated?
Yes. Courts can modify alimony if circumstances change significantly (job loss, major income change, cohabitation, remarriage). Permanent alimony typically terminates on the recipient's remarriage. Rehabilitative alimony ends at a set date or when the recipient becomes self-supporting.

This page identifies the inputs, method, and limitations behind its estimates. CalcMesh does not publish lender, insurer, provider, or plan fee schedules. Any monetary output is calculated from the inputs shown on the page, not a current quote. Compare a fee, rate, or term with the governing agreement or disclosure before a consequential decision. Calculator outputs are not professional advice. Statutory estimates here apply model formulas to stated incomes—no court worksheet is filed. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.

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Inputs, defaults, and authoritative sources
Input Default Source / authority
All inputs Domain-typical defaults Editorial methodology, CalcMesh 2026