Alimony Calculator Washington - Spousal Support Estimator

Overview

In Washington, spousal support is commonly referred to as “alimony,” but the legal term is maintenance. Maintenance is authorized by RCW 26.09.090. At the same time, Washington child support is calculated using the child support schedule and worksheet standards in RCW 26.19.020 and RCW 26.19.071 (with possible deviations under RCW 26.19.075).

DocketMath’s Alimony/Spousal Support Estimator (Washington) can help you model support outcomes based on inputs like income and family factors. It is an estimator, not a court order, and it cannot determine what a specific judge will award on specific facts.

Because many people search for “alimony,” but Washington treats maintenance and child support differently, it helps to think in two layers:

• Maintenance (spousal support): built on the statutory framework in RCW 26.09.090.
• Child support: determined separately using the schedule/worksheet in RCW 26.19.020 and RCW 26.19.071, with potential departures under RCW 26.19.075.

Important: This page is practical guidance and estimation. Washington support orders are fact-specific, and the calculator does not replace legal advice or a properly prepared worksheet.

Limitation period

Washington does not use a single, universal “limitation period” for spousal support that functions like a simple one-size-fits-all countdown for every case. Instead, support timing and how/when it can be revisited depend on what kind of order exists and what you are asking the court to do.

Also, maintenance and child support operate under different statutory frameworks and practical enforcement rules.

Here’s the practical way to think about “limitation period” in this estimator context:

• Child support (calculation framework): The baseline approach comes from the schedule and worksheet structure in RCW 26.19.020 and RCW 26.19.071, and potential changes can involve the deviation authority in RCW 26.19.075.
• Maintenance (spousal support framework): The statutory basis for determining maintenance is RCW 26.09.090.

Because this page is an estimation tool, not a procedural guide, it’s better to treat any “how long could support last / when could it be revisited” questions as case-specific. The best answer depends on whether the support is temporary vs. final, whether an order is already in place, and what legal mechanism is being used to seek a change.

Clarifier: The calculator focuses on substantive inputs (like income and family factors). It cannot capture the procedural details that control whether and how changes may be requested in a particular situation.

Key exceptions

In Washington, “exceptions” most often show up in two ways:

1. Child support deviations—when a court may depart from the presumptive amount computed under the schedule/worksheet framework.
2. Maintenance factors—when maintenance may be supported (or adjusted) based on the parties’ circumstances under RCW 26.09.090.

Child support: deviations from the presumptive amount

Washington sets a baseline child support obligation using:

• the child support schedule in RCW 26.19.020, based primarily on parents’ combined monthly net income and the number and ages of children, and
• the worksheet/standards process in RCW 26.19.071.

Then, Washington law allows deviations in certain circumstances under RCW 26.19.075.

In practical terms, this means:

• If your inputs change parenting time, net income assumptions, or child-related factors, your estimated child support can shift.
• If your situation could support a deviation under RCW 26.19.075, the real-world result might differ from the baseline estimate.

Warning (gentle): A deviation request isn’t automatic. Whether a departure is possible depends on your evidence and the specific deviation standards under RCW 26.19.075. Use the estimator to understand baseline behavior first, then identify which factual drivers could matter most.

Maintenance and how it interacts with modeling

Even though maintenance and child support are related in many real cases, Washington treats them as distinct statutory analyses:

• Child support: schedule/worksheet + potential deviations (RCW 26.19.020, RCW 26.19.071, RCW 26.19.075)
• Maintenance: factors under RCW 26.09.090

So when you model scenarios, it’s possible to see:

• child support change without the maintenance estimate changing much (or vice versa), depending on the inputs you enter.

Statute citation

DocketMath’s Washington estimator is aligned with these key statutory anchors:

• RCW 26.19.020 — Washington state child support schedule
  The schedule determines the basic child support obligation from the economic table based on combined monthly net income and the number and ages of children.
  Source: https://app.leg.wa.gov/RCW/default.aspx?cite=26.19.020

• RCW 26.19.071 — Worksheet/standards
  Describes how to apply the schedule and worksheet framework.

• RCW 26.19.075 — Deviations
  Provides the pathway for departing from the presumptive child support amount.

• RCW 26.09.090 — Maintenance
  Provides the statutory framework for spousal support/maintenance.

Default-period clarity: If you’re asking about a “default period” for support calculations, Washington’s general default child support framework is the schedule/worksheet approach in RCW 26.19.020 and RCW 26.19.071. Based on the provided statute list, there is no claim-type-specific sub-rule identified that would create a single unique, claim-type-specific “default period.” In other words, the estimator reflects the general schedule/worksheet framework rather than a claim-type-specific limitation rule.

Use the calculator

DocketMath’s Alimony/Spousal Support Estimator (Washington) is meant to help you see how estimates change when you adjust inputs. A good workflow is: baseline → tweak one factor → compare results.

Inputs to prepare (practical checklist)

Before you use the tool, gather:

• Monthly net income for both parties (or the best available approximations)
• Number of children
• Children’s ages (affects where children fall in the schedule table)
• Parenting time / custody split (affects how child support is calculated within the worksheet approach)
• Any scenario assumptions you want to test (for example, “income increases by $X/month” or “parenting time changes”)

How to read changes in the results

As you run scenarios, ask:

• Income changes: Does the estimate rise or fall as combined net income changes? This aligns with RCW 26.19.020’s table-driven approach using combined monthly net income and children’s ages/number.
• Parenting time changes: Does estimated child support shift when you adjust parenting-time inputs? That is consistent with worksheet-based calculations under RCW 26.19.071.
• Deviation-like circumstances (modeling only): If your situation suggests a deviation might be relevant, the estimator can only act as a proxy by adjusting inputs that affect the baseline calculation. Actual deviations depend on RCW 26.19.075 and case-specific facts.

Try the estimator now

Use the tool here: /tools/alimony-child-support

When you finish, record:

• the input sets you compared,
• which change moved the estimate the most (income, parenting time, or children-related inputs),
• and whether maintenance and child support outputs moved together or separately.

This can help you explain your assumptions when discussing next steps with a qualified professional. It is not legal advice.

Related reading

• How Alimony Child Support rules vary in New York — What varies by jurisdiction
• How to calculate Alimony Child Support in Philippines — Full how-to guide with jurisdiction-specific rules
• Worked example: Alimony Child Support in Philippines — Worked example with real statute citations