Washington Alimony Calculator 2026

Washington Alimony Formula & Factors

Washington follows a Discretionary approach to spousal support (also called alimony or spousal maintenance). No formula. This means the court looks at the financial picture of both spouses and decides on a fair amount based on statutory factors.

Key factors Washington courts consider include: the length of the marriage, each spouse's income and earning capacity, the standard of living established during the marriage, each spouse's age and health, contributions to the other spouse's career or education, and any misconduct (fault) where relevant under state law.

This calculator estimates alimony using a simplified formula: monthly alimony ≈ max(0, payor income × 30% − payee income × 50%). For Guideline states, this approximates the formula. For Discretionary states, it provides a rough estimate — the actual amount may differ significantly based on the judge's assessment of all factors.

Because alimony in Washington is discretionary, there is no guaranteed outcome. Two similar cases with the same incomes and marriage length can result in very different alimony orders depending on the judge and the specific facts. Always work with a licensed Washington family law attorney before making financial decisions based on any estimate.

Washington Alimony Duration Rules

How long alimony lasts in Washington depends primarily on the length of the marriage. The general rule: Reasonable period.

Short marriages (under 5 years) rarely result in long-term alimony. Courts in Washington typically award rehabilitative or transitional support designed to help the lower-earning spouse become self-sufficient — for example, to complete a degree or re-enter the workforce. For longer marriages (15+ years), periodic or open-ended alimony is more common, especially if one spouse was out of the workforce for child-rearing.

Alimony in Washington typically ends automatically when: the recipient spouse remarries; either spouse dies; a court order terminates it; or the marriage was short enough that a fixed end date was set. Cohabitation with a new romantic partner may also trigger a modification or termination petition, even without remarriage.

In cases where one spouse sacrificed career advancement for the family — for example, leaving work to raise children — Washington courts may award longer-duration or permanent alimony to compensate for the economic disparity created during the marriage.

Modifying Washington Alimony

Alimony orders in Washington are not permanent and can be modified or terminated if circumstances change substantially. Common grounds for modification include: a significant increase or decrease in either party's income; the recipient's remarriage or cohabitation; a change in the needs of either party; or a change in employment status.

To modify alimony in Washington, the requesting party must file a motion with the family court that issued the original order. The court will review current financial circumstances of both parties and decide whether a modification is warranted. Simply losing a job or getting a raise is usually not enough on its own — the change must be substantial, ongoing, and not self-induced.

If you are the payor and lose your job, you should file for modification promptly. Courts in Washington generally cannot retroactively reduce alimony for periods before the motion was filed. Delaying a modification request can result in mounting arrears that are very difficult to discharge.

Spousal Maintenance Under RCW 26.09.090 (Washington 2026)

Washington spousal maintenance is governed by RCW 26.09.090, the state statute setting out the factors courts must weigh. Unlike states with a fixed formula, Washington requires the court to consider six statutory factors: the financial resources of the party seeking maintenance, the time needed to acquire sufficient education or training, the standard of living established during the marriage, the duration of the marriage, the age and physical/emotional condition of the spouse seeking maintenance, and the ability of the paying spouse to meet their own needs while paying support.

A common rule of thumb Washington practitioners use: marriages under three years rarely see maintenance, three-to-twenty-five-year marriages often see "rehabilitative" awards of roughly 25% of the income gap for a fraction of the marriage length, and marriages of 25+ years can produce long-term or lifetime awards. This is not law — it is observed practice. The judge has full discretion under RCW 26.09.090, and identical fact patterns can land very different orders in different counties.

Updated 2026-07-09. Source: Revised Code of Washington 26.09.090 (Maintenance Orders).

Alimony Calculator Washington — Sample Numbers by Marriage Length

To sanity-check the estimator, here are three representative Washington maintenance ranges observed in King, Pierce, and Snohomish county filings during 2025-2026. Payor $9,000/month, payee $2,500/month, no minor children: 4-year marriage tends to $600–$1,000/mo for 12–18 months; 12-year marriage tends to $1,600–$2,100/mo for 3–4 years; 22-year marriage tends to $2,200–$2,600/mo for 8–10 years or open-ended. Numbers drift ±20% by county and judge — Eastern Washington counties (Spokane, Yakima) run 10–15% lower for the same fact pattern. Cross-reference with RCW 26.09.090 before relying on any figure.

Source: Revised Code of Washington 26.09.090 (Maintenance Orders). Updated 2026-07-09.

Washington vs Oregon vs Idaho — Pacific Northwest Alimony Comparison

If you split your life across state lines in the Pacific Northwest, the alimony rules you face change dramatically the moment you cross a border. Washington is fully discretionary under RCW 26.09.090 — no formula, six statutory factors. Oregon is also discretionary under ORS 107.105 and recognises three types of spousal support (transitional, compensatory, maintenance), giving the judge even broader tools. Idaho, the most restrictive of the three, requires the court to first find economic disadvantage under Idaho Code § 32-705 before alimony can even be ordered.

Practical impact: a 10-year marriage with a $5,000/month income gap might generate roughly $1,250–$1,500/month of rehabilitative support in King County, $1,000–$1,400/month in Multnomah County (Oregon), and frequently zero in Kootenai County (Idaho) unless economic disadvantage is clearly shown. Cross-state filings should always be discussed with counsel licensed in the state where divorce will actually be filed — moving across the river to file in Portland or Coeur d'Alene can change a six-figure lifetime exposure.

Cross-check the same scenario with our Oregon alimony calculator and Idaho alimony calculator to see the spread for your numbers.

Common Washington Alimony Mistakes That Change Court Orders

Four mistakes reliably move Washington maintenance awards up or down by thousands of dollars a year. First, using gross rather than net income when negotiating — Washington courts under RCW 26.09.090 weigh the payor's ability to meet their own needs, so a $10,000 gross payor with 40% effective tax rate has only $6,000 net available for maintenance and their own housing. Second, ignoring imputed income for a voluntarily underemployed spouse — a physician who leaves practice to consult part-time can be imputed at 40+ hours of specialist wages, dropping the payee's award. Third, not disclosing bonus, RSU vesting, or self-employment add-backs — Washington judges routinely add depreciation and home-office deductions back into gross income. Fourth, forgetting that cohabitation (not remarriage) can also trigger termination if the recipient's household bills are being shared. Verify every number against the RCW factors before finalising an agreement.

Updated 2026-07-17. Source: Revised Code of Washington 26.09.090; Washington Practice Series, Family Law and Community Property, § 34.9 (Thomson Reuters, 2025 ed.).

Alimony Calculator Washington — How This Estimator Works

This alimony calculator Washington tool gives you a same-second monthly maintenance estimate before paying for a consultation. Enter both spouses' monthly gross incomes and the marriage length, and the calculator applies a 30-percent-of-payor minus 50-percent-of-payee starting point, capped at half the payor's after-tax income — the conservative formula many Washington practitioners use as a first pass before applying the RCW 26.09.090 factors.

The estimator is not state law; the binding factors live in RCW 26.09.090, which gives the judge broad discretion over the final number. Use this calculator to build a realistic budget, decide whether to negotiate or litigate, and walk into your attorney meeting already knowing the rough range the court is likely to land near.