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Alimony / Spousal Support Calculator

Estimate alimony payments based on income disparity, marriage duration, and state guidelines with tax impact analysis.

Tested tool guide Tested browser tools Checked August 16, 2026

What Alimony / Spousal Support Calculator does and how it behaves

This tool takes each spouse's income, the length of the marriage, and a selected state, then returns a ballpark monthly or annual alimony figure alongside its after-tax effect on both parties. Most users are surprised to learn that no single national formula sets alimony: many states leave the amount to judicial discretion weighing statutory factors, so any number here is a planning estimate, not a prediction of what a judge will order. The tax section reflects that alimony has not been federally deductible to the payer or taxable to the recipient since agreements executed after December 31, 2018.

How the result is produced

1

Income-disparity and duration inputs

You enter both spouses' gross incomes, years married, and a state. The calculator applies a simple guideline-style formula (the kind some states or counties publish as an advisory starting point for temporary support) to produce a suggested payment range, scaling roughly with the income gap and with marriage length.

2

After-tax comparison

The tool re-runs the estimated payment through the current federal rule: for divorce or separation instruments executed after 2018, alimony is not deductible by the payer and not reported as income by the recipient. It shows the net cost to the payer and net receipt to the recipient under that rule, letting you compare against a pre-2019 agreement's tax treatment if relevant.

Good uses

  • A spouse heading into mediation wants a ballpark figure to anchor an opening settlement position
  • A paralegal or self-represented party needs a quick sanity check on a number opposing counsel proposed
  • Someone comparing two settlement offers wants to see which is worth more after tax, not just on paper

Limits and checks

  • Many states have no fixed alimony formula at all; the guideline math shown here is often only used for temporary/pendente lite support in certain jurisdictions, and permanent awards are usually judge discretion based on statutory factors
  • The 'not taxable, not deductible' rule is federal; it does not automatically describe how a specific state taxes alimony on state returns, and pre-2019 agreements can be grandfathered under the old rule
  • The estimate ignores child support offsets, cohabitation or remarriage termination clauses, and modification triggers, all of which change the real payment over time

Common questions

Is the alimony I pay still tax-deductible?

No, not for divorce or separation agreements executed after December 31, 2018 - the payer gets no federal deduction and the recipient owes no federal tax on it. Agreements finalized before that date keep the old deductible/taxable treatment unless later modified to adopt the new rule.

Will a judge actually order the amount this tool shows me?

No. This is a rough estimate, not a legal prediction. Most states decide alimony case by case using factors like earning capacity, health, and standard of living, so the actual order can land well above or below this figure - confirm with a family law attorney before relying on it.

References and verification

The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.

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