Alimony Calculator (2026)

Estimate monthly alimony (spousal support) the way your state actually approaches it. Massachusetts and Illinois have statutory formulas, Arizona has an official expenditure-based guideline, and every other state weighs legal factors with no formula at all — so this tool runs the real formula where one exists and clearly labels the unofficial estimate where none does.

Estimate only — not legal advice. Alimony is decided by a court, and eligibility (one spouse’s need and the other spouse’s ability to pay) is decided before any amount is calculated. Only a few states use a formula at all. Use this tool for planning, and consult a family law attorney in your state for advice about your case.

Calculate Alimony / Spousal Support

Only Massachusetts, Illinois and Arizona (of the states covered here) set amounts by formula or guideline. Every other state uses legal factors, so the general estimate is an unofficial benchmark — see the warning in the results.

Before taxes, from all sources. The paying spouse is normally the higher earner.

Months beyond the full years above (0–11).

How Alimony Works in the United States

There is no national alimony formula. Each state decides spousal support under its own law, and in most states there is no percentage formula at all: a judge weighs statutory factors such as each spouse’s need and ability to pay, the length of the marriage, the standard of living during the marriage, ages and health, and each spouse’s earning capacity. In every state, eligibility comes first — a spouse must show a qualifying need (and the other spouse the ability to pay) before any amount is discussed.

Only a minority of states set amounts by formula or guideline. Three of them are built into this calculator with their real rules:

  • Massachusetts — a statutory range: 30–35% of the difference between the spouses’ gross incomes, capped at the recipient’s need, with a statutory duration schedule.
  • Illinois — a statutory formula on net incomes: 33⅓% of the payor’s net minus 25% of the recipient’s net, with a 40% combined-income cap and a statutory duration scale.
  • Arizona — since 2023, an official guideline whose amount comes from an expenditure-based calculator (not an income percentage), with duration ranges a court may not change.

For every other state this tool shows the unofficial AAML-style benchmark described below, plainly labelled as unofficial. One more state is worth knowing about: Virginia has a statutory percentage formula, but only for temporary (pendente lite) support while a case is pending — final Virginia awards are factors-based, so Virginia belongs with the general estimate here.

Massachusetts: 30–35 Percent of the Gross Income Difference

Under the Massachusetts Alimony Reform Act (G.L. c. 208, Section 53(b)), the amount of general term alimony should generally not exceed the recipient’s need or 30 to 35 percent of the difference between the parties’ gross incomes. The calculator shows that percentage range; a court then compares it with the recipient’s actual need and may award less. Courts can also deviate from the range with written findings (Section 53(e)).

Massachusetts estimated monthly alimony = 30% to 35% × (payor gross income − recipient gross income) ÷ 12
Duration limit = a set percentage of the months of marriage (table below)

Massachusetts duration limits (Section 49(b))

Length of marriage Maximum general term alimony duration
5 years or less 50% of the months of marriage
Over 5 to 10 years 60% of the months of marriage
Over 10 to 15 years 70% of the months of marriage
Over 15 to 20 years 80% of the months of marriage
Over 20 years Indefinite (court’s discretion)

General term alimony also generally ends when the paying spouse reaches full retirement age, when the recipient remarries, or when either spouse dies, and it can be suspended, reduced or terminated if the recipient cohabits with a partner for at least three months.

Is there a $250,000 cap on Massachusetts alimony?

No — that figure is not in the alimony statute. Sections 53 and 49 contain no dollar cap at all. The $250,000 number was the child support guideline maximum before 2021 (it is $450,000 from December 1, 2025), and it leaked into alimony discussions because Section 53(c)(2) excludes, from an alimony calculation, gross income already considered in setting a child support order. Where both alimony and child support are in play, Massachusetts courts run the calculation both ways — alimony first and child support first — and compare the after-tax results (the approach required since Cavanagh v. Cavanagh, 490 Mass. 398 (2022)). This calculator does not model that interaction; if you have minor children, run our child support calculators too and expect the two orders to be set together.

Illinois: the Statutory Maintenance Formula

Illinois is one of the few states with a true statutory formula (750 ILCS 5/504(b-1)). It applies when the spouses’ combined gross income is under $500,000 and neither has a support obligation from a prior relationship; above that line, the court sets maintenance by factors instead.

Illinois annual maintenance = 33⅓% × payor NET income − 25% × recipient NET income
Cap: recipient’s net income + maintenance may not exceed 40% × combined net income
Duration = length of marriage × a statutory factor (below)

The duration factor starts at 0.20 for marriages under 5 years and rises by 0.04 for each additional year — 0.24 at 5–6 years, 0.44 at 10–11 years, 0.64 at 15–16 years and 0.80 at 19–20 years. For marriages of 20 years or more, maintenance runs for a period equal to the length of the marriage, or indefinitely. Because the formula runs on net income, this calculator either estimates net from gross (2026 federal single-filer brackets, the $16,100 standard deduction, and FICA) or uses net incomes you enter directly — courts compute net under the statute’s own tax rules, so estimated results run as previews, not orders.

Arizona: an Expenditure-Based Guideline, Not a Percentage

Arizona became a guideline state recently: A.R.S. Section 25-319 directed the Arizona Supreme Court to issue Spousal Maintenance Guidelines, adopted in 2023 and revised effective September 1, 2025 (Administrative Order 2025-101). The amount is not a percentage of the income difference. The official calculator (at azcourts.gov) takes the family size and each spouse’s Spousal Maintenance Income, builds combined household expenditures from U.S. Bureau of Labor Statistics Consumer Expenditure Survey data, subtracts the receiving spouse’s pro-rata share, and produces an amount range; the court then picks within the range using the statutory factors and may leave the range (even to $0) only with written findings. Two documented anchors: if combined annual Spousal Maintenance Income is very low the official range can start at $0 (it always starts at $0 below $44,000 of combined income), and a high-income adjustment adds up to +70% at high family incomes, starting at $175,000 a year.

Because the expenditure tables behind that calculator cannot be reproduced faithfully here, this tool does not fake an Arizona amount. Instead it walks you through the guideline steps and computes the one part that is exact: the duration range, which courts may not deviate from.

Length of marriage Arizona guideline duration range
Under 24 months 3 to 12 months
24 to under 60 months 6 to 36 months
60 to under 120 months 6 to 48 months
120 to under 192 months 12 to 60 months
192 months (16 years) or more 12 months to the greater of 144 months or 50% of the marriage
Rule of 65 met Case by case (court’s discretion)

The Rule of 65 applies only if all three are true when the petition is served: the receiving spouse is at least 42 years old, the marriage lasted at least 16 years, and the recipient’s age plus the years of marriage total at least 65. Before any of this, the requesting spouse must meet one of the eligibility grounds in Section 25-319(A) — for example lacking sufficient property or earning ability to meet reasonable needs — which no calculator can decide.

Other States: Factors, Not Formulas — and the Unofficial Benchmark

In the remaining states there is no formula to apply. Judges weigh factor lists that typically include the length of the marriage, each spouse’s income and earning capacity, age and health, contributions to the marriage (including homemaking and career sacrifices), the marital standard of living, and sometimes fault. Some states cap duration without fixing amounts — New Jersey, for example, generally limits alimony for marriages under 20 years to no longer than the marriage itself.

To give visitors in those states some starting number, calculator sites widely reproduce the AAML benchmark (an American Academy of Matrimonial Lawyers guideline):

UNOFFICIAL general estimate = 30% × payor gross − 20% × recipient gross
Cap: recipient’s gross + alimony may not exceed 40% × combined gross income

Treat that figure as a conversation starter only. A judge in a factors state can award more, less, or nothing, and short marriages in particular often produce small or no awards that no percentage benchmark predicts.

Worked Example: Massachusetts

Step Calculation Result
Gross income difference $120,000 − $45,000 $75,000/yr
Low end (30%) 30% × $75,000 $22,500/yr = $1,875.00/mo
High end (35%) 35% × $75,000 $26,250/yr = $2,187.50/mo
Duration (12-year marriage) 70% × 144 months About 101 months (8 years, 5 months)

Worked Example: Illinois (with the 40% cap)

Step Calculation Result
Payor estimated net income $110,000/yr gross minus est. federal tax $15,370 and FICA $8,415 $86,215.00/yr
Recipient estimated net income $50,000/yr gross minus est. federal tax $3,820 and FICA $3,825 $42,355.00/yr
Formula amount 33⅓% × $86,215 − 25% × $42,355 $18,149.58/yr
40% cap check Recipient total $42,355 + $18,149.58 = $60,504.58 vs. 40% × $128,570 combined net = $51,428 Cap applies
Capped maintenance $51,428 − $42,355 $9,073.00/yr = $756.08/mo
Duration (9-year marriage) Factor 0.40 × 108 months About 43 months (3 years, 7 months)

Worked Example: General Estimate (Unofficial)

Step Calculation Result
AAML-style amount 30% × $100,000 − 20% × $20,000 $26,000/yr = $2,166.67/mo
40% cap check Recipient total $20,000 + $26,000 = $46,000 vs. 40% × $120,000 = $48,000 Under the cap — no change
Cross-check range 20% to 35% of the $80,000 gross difference $1,333.33 to $2,333.33/mo
Typical duration heuristic 30% to 50% of a 10-year marriage About 36 to 60 months

Frequently Asked Questions

Only a minority. Massachusetts uses a statutory range (30–35% of the gross income difference, capped at need), Illinois uses a statutory net-income formula with a 40% cap, and Arizona uses an official expenditure-based guideline calculator. Virginia has a statutory formula for temporary (pendente lite) support only. Everywhere else, judges weigh statutory factors and there is no formula — any single number a website shows you for those states is an unofficial heuristic, including the general estimate in this tool.

No. There is no dollar cap anywhere in the Massachusetts alimony statute (G.L. c. 208, Sections 49 and 53). The $250,000 figure was the child support guideline maximum before 2021 — $450,000 from December 1, 2025 — and it is connected to alimony only because income already used to set child support is excluded from the alimony calculation. Websites that apply a $250,000 alimony cap are repeating an outdated mix-up.

It depends on the state and the marriage. Massachusetts caps general term alimony at 50–80% of the months of marriage (indefinite only over 20 years). Illinois multiplies the marriage length by a factor from 0.20 up to 0.80 (equal to the marriage, or indefinite, at 20+ years). Arizona uses fixed duration ranges a court cannot change. In factors-only states a common rule of thumb is support for roughly 30–50% of the marriage length on mid-length marriages, but judges decide case by case.

For divorce or separation agreements executed after December 31, 2018, alimony is not deductible by the spouse who pays it and is not taxable income for the spouse who receives it, under federal law. Agreements from before 2019 generally keep the old treatment (deductible to the payor, taxable to the recipient) unless they are modified to adopt the new rule. State tax treatment can differ, and child support is never deductible or taxable either way.

Usually yes, on a material change in circumstances — job loss, retirement, a big income change, or the recipient’s remarriage or (in Massachusetts) cohabitation of at least three months. Death of either spouse ends it. Arizona is stricter about duration: its guideline duration ranges may not be deviated from, although amounts can be adjusted with written findings. Whether an order can be modified at all depends on its terms and state law, so check the order itself.

Yes — the two are set together and child support generally takes priority. In Massachusetts, income already considered for a child support order is excluded from the alimony calculation, and courts must run the numbers in both orders (alimony first, then child support first) and compare after-tax outcomes. If you have minor children, estimate child support with our state child support calculators as well; the combined orders are what a court will actually issue.
Disclaimer: Estimate only — not legal advice. Massachusetts figures follow G.L. c. 208, Sections 49 and 53; Illinois figures follow 750 ILCS 5/504(b-1) with net incomes estimated as described on this page; Arizona duration ranges follow A.R.S. Section 25-319 and the Arizona Supreme Court Spousal Maintenance Guidelines (Administrative Order 2025-101, effective September 1, 2025); the general estimate is an unofficial AAML-style benchmark that no state has adopted. Actual awards are set by the court and may differ. For advice about your case, consult a family law attorney in your state.

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