How Is Alimony Calculated? A State-by-State Guide

TL;DR: How do you calculate alimony? It depends on your state. A minority of states publish a formula (usually a percentage of the higher earner's income minus a percentage of the lower earner's income, with a cap), while most states leave the amount to a judge weighing statutory factors like the length of the marriage, each spouse's earning capacity, and the standard of living. Duration is usually tied to how long you were married. To run your own numbers, use the free alimony calculator; to understand what a court is likely to do with them, read on.

If you are going through a divorce, "how much alimony will I get?" (or "how much will I pay?") is usually one of the first questions. The honest answer is that there is no single national formula. Each state writes its own rules, and even in states with a formula, the judge can move away from it.

What you can do is understand the method your state uses, run the math, and see where your situation sits. This guide explains how alimony is calculated across the U.S.: the factors courts weigh, the types of support, the states that use formulas (with worked examples), how long payments last, and what changed on the federal tax side.

This article is general information, not legal advice. Alimony outcomes depend heavily on the facts, the county, and the judge, so treat the numbers below as a starting point for a conversation with a family law attorney.

Key Takeaways

• Alimony, spousal support, and maintenance are the same idea under different names. States use whichever term their statute uses.
• Formula states (Illinois, Colorado, New York, and others) calculate a guideline amount from both spouses' incomes, then apply a cap and a duration table.
• Discretionary states (California for permanent support, Pennsylvania for post-divorce alimony, and many others) have no formula; the judge weighs a list of factors.
• Duration usually scales with the length of the marriage. Several states cap it at a percentage of the marriage's length.
• Taxes: for divorce agreements signed after 2018, the payer cannot deduct alimony and the recipient does not report it as income.

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How do you calculate alimony? The two approaches

Every state answers two questions: whether alimony should be paid at all, and if so, how much and for how long. States handle the second question in one of two ways.

1. Guideline (formula) states. The statute or a court rule gives a formula. A typical version takes a percentage of the higher earner's income, subtracts a percentage of the lower earner's income, and then checks the result against a cap so the recipient never ends up with more than a set share (often 40%) of the couple's combined income. The judge still decides whether support is appropriate first, and can deviate from the result with written reasons.

2. Discretionary (factor-based) states. There is no formula. The judge looks at a statutory list of factors, reviews each spouse's budget and income, and sets an amount that is "reasonable" or "just." Outcomes vary more, which is why two couples with similar incomes can end up with very different orders.

Some states mix the two: a formula for temporary support while the case is pending, and a factor test for post-divorce alimony. California and Pennsylvania both work this way.

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The factors courts use to calculate spousal support

Whether your state has a formula or not, judges look at a remarkably similar list. Illinois lists 14 factors, Pennsylvania 17, and most other states land somewhere in between. The ones that matter most in practice:

• Length of the marriage. The single biggest driver of duration, and often of amount. Short marriages rarely produce long awards.
• Each spouse's income and earning capacity. Courts look at actual income and, where a spouse is voluntarily underemployed, at what they could earn.
• Need and ability to pay. The recipient's reasonable needs on one side, the payer's capacity after their own reasonable expenses on the other.
• Standard of living during the marriage. The lifestyle you built together sets the benchmark for "reasonable needs."
• Age and health. A spouse with a serious illness or near retirement has less ability to become self-supporting.
• Contributions to the marriage. Homemaking, childcare, and supporting the other spouse's education or career all count.
• Time and cost to become self-supporting. How long retraining or re-entering the workforce will take.
• Property division. A spouse who receives substantial assets in the divorce may need less ongoing support.
• Child custody. A parent caring for young or disabled children may have limited ability to work.
• Marital misconduct. Some states (Pennsylvania and Texas among them) let the court consider misconduct or family violence; many others do not.

If you want to see how courts in your state have applied these factors to facts like yours, AI case law search lets you pull reported decisions with links back to the full opinions.

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Types of alimony

The label matters because each type has its own purpose, and often its own time limit.

Permanent alimony has been shrinking. Florida eliminated it in 2023, and states such as Massachusetts now end general term alimony when the payer reaches full Social Security retirement age.

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Formula states: how spousal support calculation works, state by state

Below are the guideline formulas used by some of the most-searched states, each followed by a worked example. Figures are illustrative; your real numbers depend on how your state defines "income," which is where much of the fighting in a divorce actually happens.

Illinois: 33.33% minus 25%, capped at 40%

Illinois uses a statutory formula in 750 ILCS 5/504(b-1) when the couple's combined gross annual income is under $500,000 and the payer has no child support or maintenance obligation from a prior relationship.

• Amount: 33 1/3% of the payer's net annual income, minus 25% of the recipient's net annual income.
• Cap: the recipient's net income plus maintenance cannot exceed 40% of the couple's combined net income.
• Duration: the length of the marriage multiplied by a factor that starts at 0.20 for marriages under 5 years and rises by 0.04 each year to 0.80 for marriages of 19 to 20 years. At 20 years or more, the court orders maintenance for a period equal to the marriage or for an indefinite term.

Worked example. The payer nets $120,000 a year and the recipient nets $40,000. They were married 12 years.

1. 33.33% × $120,000 = $40,000
2. 25% × $40,000 = $10,000
3. Preliminary amount: $40,000 − $10,000 = $30,000
4. Cap check: 40% × $160,000 combined = $64,000. The recipient would have $40,000 + $30,000 = $70,000, which exceeds the cap, so maintenance is reduced to $64,000 − $40,000 = $24,000 a year ($2,000 a month).
5. Duration: 12 years × 0.52 = about 6.2 years.

The cap step is the one people most often miss. You can check your own figures with the Illinois alimony calculator, and if you are budgeting for the whole process, see our breakdown of the cost of divorce in Illinois.

Colorado: 40% of combined income minus the lower income

Colorado's advisory guideline (C.R.S. 14-10-114) applies to marriages of at least 3 years where the couple's combined annual adjusted gross income is $240,000 or less.

• Amount: 40% of the combined monthly adjusted gross income, minus the lower earner's monthly income.
• Tax adjustment: because maintenance is no longer deductible federally for new orders, the result is multiplied by 80% if combined income is $10,000 a month or less, or 75% if it is between $10,001 and $20,000.
• Duration: an advisory table runs from 31% of the months of marriage at 36 months up to 50% at 150 months (12.5 years) through 20 years. For marriages over 20 years, the court may order a set term or an indefinite one.

Worked example. Monthly incomes of $8,000 and $3,000, married 10 years (120 months).

1. 40% × $11,000 combined = $4,400
2. $4,400 − $3,000 = $1,400
3. Combined income is between $10,001 and $20,000, so 75% × $1,400 = $1,050 a month
4. Duration: 120 months × 45% = 54 months (4.5 years)

Colorado is explicit that these guidelines create no presumption: the court still decides whether maintenance is appropriate at all.

New York: two formulas, a lower-of test, and an income cap

New York's post-divorce maintenance formula (Domestic Relations Law § 236(B)(6)) applies to the payer's income up to a cap, which rose from $228,000 to $241,000 on March 1, 2026. Income above the cap can be added at the court's discretion.

• If child support is also being paid: 20% of the payer's income minus 25% of the recipient's income.
• If no child support is being paid: 30% of the payer's income minus 20% of the recipient's income.
• Then compare: 40% of combined income minus the recipient's income. The lower of the two figures is the guideline amount.
• Duration (advisory): 15% to 30% of the marriage's length for marriages up to 15 years, 30% to 40% for 15 to 20 years, and 35% to 50% for more than 20 years.

Worked example. The payer earns $150,000, the recipient $50,000, no children, married 18 years.

1. 30% × $150,000 − 20% × $50,000 = $45,000 − $10,000 = $35,000
2. 40% × $200,000 − $50,000 = $30,000
3. Guideline maintenance is the lower figure: $30,000 a year ($2,500 a month)
4. Duration: 30% to 40% of 18 years = roughly 5.4 to 7.2 years

Massachusetts: a ceiling of 30% to 35% of the income gap

Massachusetts does not use a strict formula, but its Alimony Reform Act sets a ceiling. General term alimony should generally not exceed the recipient's need or 30% to 35% of the difference between the parties' gross incomes (M.G.L. c. 208, § 53(b)).

Duration is capped by marriage length (§ 49(b)): up to 50% of the months of marriage for marriages of 5 years or less, 60% for 5 to 10 years, 70% for 10 to 15 years, 80% for 15 to 20 years, and an indefinite term allowed only after 20 years. General term alimony ends when the payer reaches full retirement age.

Worked example. Gross incomes of $180,000 and $60,000, married 12 years. The gap is $120,000, so the ceiling is $36,000 to $42,000 a year (unless the recipient's need is lower). Duration is capped at 70% of 144 months, about 100 months.

Florida: 35% of the net income gap, no permanent alimony

Florida overhauled section 61.08 in 2023. Courts can now award temporary, bridge-the-gap, rehabilitative, or durational alimony; permanent alimony is gone.

• Amount (durational): no more than the recipient's reasonable need or 35% of the difference between the parties' net incomes, whichever is less.
• Duration (durational): up to 50% of the marriage's length for marriages under 10 years, 60% for 10 to 20 years, and 75% for 20 years or more, measured from the wedding to the filing date. Exceeding those limits requires exceptional circumstances.
• Other caps: bridge-the-gap alimony may not exceed 2 years; rehabilitative alimony may not exceed 5 years.

Worked example. Net monthly incomes of $9,000 and $4,000, married 15 years. The gap is $5,000, so the cap is $1,750 a month (or less if need is lower), for up to 60% of 15 years, or 9 years.

Texas: strict eligibility and tight caps

Texas is the toughest state for receiving court-ordered spousal maintenance. Under Texas Family Code chapter 8, a spouse must first lack enough property to meet their minimum reasonable needs and fit one of the eligibility gates: a family violence conviction or deferred adjudication against the other spouse, an incapacitating disability, a marriage of 10 years or longer plus an inability to earn enough, or care of a disabled child of the marriage.

• Amount cap (§ 8.055): the lesser of $5,000 a month or 20% of the payer's average monthly gross income.
• Duration cap (§ 8.054): 5 years for marriages of 10 to 20 years (or under 10 years in family violence cases), 7 years for 20 to 30 years, and 10 years for 30 years or more, limited to the shortest reasonable period. The exception: when the recipient is disabled or cares for a disabled child, maintenance can continue as long as that condition lasts, subject to periodic review.

Worked example. The payer grosses $9,000 a month and the marriage lasted 15 years. The maximum is 20% × $9,000 = $1,800 a month, for no more than 5 years. Texas couples can still agree to larger "contractual alimony" in a settlement.

Pennsylvania: formula for spousal support, factors for alimony

Pennsylvania uses a formula (Pa.R.Civ.P. 1910.16-4) for spousal support and alimony pendente lite while the parties are separated or the divorce is pending. The core worksheet takes 33% of the payer's monthly net income minus 40% of the recipient's when there are no dependent children, and 25% minus 30% when there are.

Worked example. Net monthly incomes of $6,000 and $2,000, no children: 33% × $6,000 − 40% × $2,000 = $1,980 − $800 = $1,180 a month in temporary support.

Once the divorce is final, post-divorce alimony under 23 Pa.C.S. § 3701 has no formula. The court weighs 17 factors, including relative earnings, the length of the marriage, the standard of living, and marital misconduct during the marriage, and sets a definite or indefinite term that is reasonable under the circumstances.

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Discretionary states: California and most of the country

In most states, there is no alimony formula for the final order. California is the best-known example.

• Temporary support: many California counties use a local guideline. Santa Clara County's rule, for example, starts from 40% of the payer's net income minus 50% of the recipient's net income, adjusted for taxes.
• Permanent (long-term) support: the court must weigh the factors in Family Code § 4320 rather than run a temporary-support formula.
• Duration: for marriages under 10 years, a "reasonable period" is generally half the length of the marriage (§ 4320(l)). Marriages of 10 years or more are presumed to be of "long duration" (§ 4336), and the court may keep jurisdiction over support without a fixed end date.

The same pattern (factor list, budget review, judge's discretion) applies across most of the remaining states. Local practice matters, which is why a local family lawyer's read of "what judges here usually do" is valuable.

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State formulas at a glance

Looking for an alimony calculator by state? Our free spousal support calculator applies the published guideline for many states and a general estimate where no formula exists.

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How much alimony can I get? A realistic way to estimate

To estimate how much spousal support you will get (or pay), work through these steps in order:

1. Confirm eligibility. In strict states like Texas, many spouses do not qualify at all. In others, a short marriage with similar incomes often produces no award.
2. Pin down income. Use the definition your state uses (gross, net, or adjusted gross) and include bonuses, self-employment income, rental income, and investment income. If a spouse is underemployed, the court may impute income.
3. Run the guideline or ceiling. If your state has a formula, apply it and the cap. If it does not, compare the recipient's reasonable monthly budget with what the payer can afford.
4. Account for child support. In many states, child support is calculated first and reduces the income available for alimony. The child support calculator handles that piece.
5. Apply the duration rule. Multiply by your state's percentage or factor for your marriage length.
6. Consider the property split. A lump-sum buyout of the house or a retirement account can reduce or replace ongoing support; the divorce buyout calculator shows what buying out a spouse's equity looks like.

If your spouse has already proposed numbers in a draft settlement, AI document review can flag unusual alimony terms, missing termination triggers, or vague modification language before you sign.

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How long does alimony last, and when does it end?

Duration rules fall into three patterns:

• Percentage of the marriage (Illinois, Colorado, Florida, Massachusetts, New York's advisory schedule).
• Fixed maximums (Texas: 5, 7, or 10 years, except in disability cases).
• Judicial discretion with rules of thumb (California's half-the-marriage guideline for marriages under 10 years).

Across states, alimony commonly ends early when the recipient remarries, when either spouse dies, or, in many states, when the recipient cohabits with a new partner. Most orders can be modified if there is a substantial change in circumstances, such as job loss or a disability, unless the settlement agreement makes the alimony non-modifiable. Spouses can also waive or limit alimony in advance through a valid prenuptial or postnuptial agreement.

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A brief note on federal taxes

For any divorce or separation agreement executed after December 31, 2018, the payer cannot deduct alimony and the recipient does not include it in income. Agreements signed before 2019 keep the old treatment (deductible for the payer, taxable to the recipient) unless they are later modified and the modification expressly adopts the new rule.

That shift is why Colorado now discounts its guideline by 20% to 25%, and why older formulas can overstate what a payer can afford after tax. State income tax treatment can differ from the federal rule.

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Where to get answers about your own situation

Formulas give you a range. Your actual order depends on how your state defines income, whether a judge deviates, and what you negotiate. Before meeting a lawyer, it helps to know which rules apply to you and what questions to ask.

An AI legal assistant like LegesGPT can walk you through your state's alimony statute, explain how the factors apply to facts like yours, and point you to the exact code sections and cases behind each answer, so you can verify everything yourself. When the stakes are high, bring that research to a licensed family law attorney in your state.

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Frequently Asked Questions

How do you calculate alimony?

It depends on your state. Formula states such as Illinois, Colorado and New York take a percentage of the higher earner's income, subtract a percentage of the lower earner's income, and cap the result so the recipient does not end up with more than about 40 percent of combined income. Most other states have no formula, so a judge weighs factors like marriage length, earning capacity, need, and the marital standard of living. Duration is usually tied to how long the marriage lasted.

How much spousal support will I get?

Start by checking whether you are eligible under your state's rules, then apply your state's guideline or ceiling to both spouses' incomes, subtract any effect of child support, and multiply by the duration rule for your marriage length. For example, Illinois uses 33.33 percent of the payer's net income minus 25 percent of the recipient's, while Florida caps durational alimony at 35 percent of the net income gap. A judge can still deviate, so treat any estimate as a range.

Is there an alimony calculator by state?

Yes. LegesGPT's free alimony calculator applies the published guideline for many states and gives a general estimate where no formula exists, and there is a dedicated Illinois maintenance calculator. Calculators are only as good as the income figures you enter, so use your state's definition of income (gross, net, or adjusted gross).

How long does alimony last?

Many states tie duration to the length of the marriage. Illinois multiplies the years of marriage by a factor from 0.20 to 0.80, Florida allows up to 50, 60, or 75 percent of the marriage length, Massachusetts allows 50 to 80 percent before 20 years, and Texas generally caps maintenance at 5, 7, or 10 years unless the recipient or a child in their care is disabled. Alimony often ends early on remarriage, death, or in many states cohabitation.

Is alimony taxable?

Under federal law, alimony paid under a divorce or separation agreement executed after December 31, 2018 is not deductible by the payer and is not taxable income to the recipient. Agreements signed before 2019 keep the old treatment unless they are modified and the modification expressly adopts the new rule. State tax treatment can differ.

Does the length of the marriage affect alimony?

Yes, it is usually the single biggest factor for duration and often for amount. Short marriages rarely produce long awards, and several states only allow indefinite alimony after roughly 20 years of marriage. California presumes marriages of 10 years or more are of long duration.

Can alimony be changed after the divorce?

In most states, yes, if there is a substantial change in circumstances such as job loss, disability, or the recipient's remarriage or cohabitation. The exception is when the settlement agreement makes alimony non-modifiable, which many states allow if the agreement says so clearly.

Where can I get answers about alimony in my specific situation?

A family law attorney licensed in your state is the right person for advice on your case. To prepare, LegesGPT can explain your state's alimony statute and how the factors apply to facts like yours, with citations to the exact code sections and cases so you can verify every answer.