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Washington Alimony Calculator & Spousal Support Guidelines (2026)

Washington has no fixed alimony formula — see how courts apply RCW 26.09.090, typical amount ranges, and duration norms.

This state has no statutory formula. The range shown is a reference based on income difference and common outcomes — actual awards vary widely.

Estimate Spousal Support

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Washington Alimony Rules at a Glance

How amount is set Court discretion (statutory factors)
Formula / practice Judges weigh statutory factors: marriage length, each spouse’s income and earning capacity, standard of living, and contributions to the marriage.
Statute RCW 26.09.090
Parameters verified 2026-07

Worked Example: $8,000 vs $3,000 Income, 12-Year Marriage

  1. Higher-earning spouse: $8,000/mo - lower-earning spouse: $3,000/mo - 12-year marriage, no concurrent child support.
  2. No statutory formula in this state - reference range from the $5,000 income difference at common outcome rates (15-25%): $750-$1,250 per month.
  3. Duration commonly runs one-third to one-half of marriage length for a 12-year marriage, at the court’s discretion.

Result: $750 - $1,250 per month (reference range) - typical duration: commonly one-third to one-half of marriage length (court discretion)

Washington Alimony FAQ

How is alimony calculated in Washington?

There is no fixed formula in Washington. Under RCW 26.09.090, judges weigh marriage length, each spouse’s income and earning capacity, age and health, and the marital standard of living. The calculator above shows a reference range based on income difference.

How long does alimony last in Washington?

Duration is at the court’s discretion - commonly one-third to one-half of the marriage length for mid-length marriages, longer or indefinite for marriages over 20 years.

When does alimony end in Washington?

Alimony typically ends on the recipient’s remarriage or either party’s death, and can be modified or terminated on the recipient’s cohabitation or a substantial change in circumstances, per RCW 26.09.090 and case law. Agreements can make support non-modifiable by contract.

Is alimony taxable in Washington?

For divorces finalized after 2018, alimony is not deductible by the payor and not taxable to the recipient under federal law. State income tax treatment can differ - check current state rules.

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About This Estimate

Estimate only — not legal advice. Based on Washington law (RCW 26.09.090), last verified 2026-07. Courts may deviate — this state sets alimony case by case. Consult a family law attorney for your situation.