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How U.S. States Calculate Alimony: Formula Families (2026)

Guide · Alimony · Reviewed September 20, 2026 · about 10 min read

Alimony, also known as spousal support or maintenance, is financial assistance paid by one spouse to the other after a divorce. The rules for calculating alimony vary significantly across the United States. Some states use specific statutory formulas to determine the amount and duration of payments, while others grant judges broad discretion to decide based on a list of factors.

This guide groups the 51 U.S. jurisdictions (50 states plus the District of Columbia) by their approach to alimony calculation. You will learn which states fall into each category, understand the mechanics of their formulas (including actual percentages and caps), and see what aspects of alimony are left to judicial discretion. By the end of this guide, you will be able to identify the general framework for alimony in any U.S. jurisdiction, helping you understand the rules before consulting with a legal professional.

Two Main Approaches: Formulaic vs. Discretionary Alimony

When a marriage ends, courts determine alimony based on state law. These laws generally fall into two broad categories:

  • Formulaic States: A minority of states provide specific mathematical formulas or advisory guidelines in their statutes or court rules. These formulas typically consider the incomes of both spouses and the length of the marriage to arrive at a presumptive amount and duration. While judges in these states still have some discretion, they usually must justify any deviation from the formula.
  • Discretionary States: The majority of states do not have a statutory formula. Instead, judges consider a comprehensive list of factors outlined in state law to determine if alimony is appropriate, its amount, and its duration. These factors often include the length of the marriage, the age and health of each spouse, their earning capacities, the marital standard of living, and each spouse's contributions to the marriage.

States with Statutory Formulas: The Formula Families

A growing number of states have adopted statutory formulas or advisory guidelines to bring more predictability and consistency to alimony awards. These formulas vary in their complexity and the specific factors they incorporate.

The "Difference Percentage" Formula

This formula calculates alimony as a percentage of the difference between the spouses' incomes. The base income (gross or net) and the specific percentages vary by state. Duration is typically tied to the length of the marriage.

  • Florida: Alimony is calculated as 35% of the difference in the spouses' net incomes. This amount is capped by the recipient's reasonable need. Permanent alimony was abolished for cases filed on or after July 1, 2023. Duration for durational alimony is capped at 50% of the marriage length for short-term marriages (under 10 years), 60% for moderate-term marriages (10–20 years), and 75% for long-term marriages (over 20 years). No durational alimony may be awarded for a marriage lasting less than 3 years. (Fla. Stat. § 61.08)
  • Massachusetts: General term alimony is capped at the recipient's need or 30–35% of the difference in the spouses' gross incomes, whichever is lower. The duration is capped at 50% of the marriage length for marriages of 5 years or less, 60% for more than 5 up to 10 years, 70% for more than 10 up to 15 years, and 80% for more than 15 up to 20 years. For marriages longer than 20 years, alimony may be indefinite. (M.G.L. c. 208 §§ 49, 53)
  • New Hampshire: Term alimony is the lesser of the recipient's reasonable need or 23% of the difference in gross incomes. The statutory maximum duration is half the marriage length. (RSA 458:19-a)

The "Net Income Offset" Formula

This formula involves taking a percentage of the payer's net income and subtracting a percentage of the recipient's net income. A combined income cap often applies.

  • Illinois: Maintenance is calculated as 33⅓% of the payer's net income minus 25% of the recipient's net income. The resulting maintenance, when added to the recipient's net income, cannot exceed 40% of the combined net incomes of both spouses. This formula applies to combined gross incomes up to $500,000. Duration is determined by a multiplier based on marriage length, ranging from 0.2 for marriages under 5 years to 0.8 for marriages of 19–20 years. For marriages of 20 years or more, the court may order maintenance for a period equal to the length of the marriage or for an indefinite term. (750 ILCS 5/504(b-1))

The "Capped Maintenance" Formula

These states impose a strict cap on the amount of maintenance, often as a percentage of income or a fixed dollar amount, and have restrictive eligibility requirements.

  • Louisiana: Maintenance is limited to one-third (33.33%) of the payer's net income, with no fixed monthly dollar cap. Eligibility is restrictive, requiring the requesting spouse to be free from fault before filing. Louisiana sets no fixed duration schedule; final periodic support lasts until modified, or ends on remarriage, cohabitation, or death. (La. Civ. Code arts. 111–112)
  • Texas: Maintenance is capped at the lesser of $5,000 per month or 20% of the payer's gross income. Eligibility is generally restricted to marriages of 10 years or more, or cases involving family violence. For marriages of 10–20 years, maintenance may last at most 5 years. For marriages of 20–30 years, it may last at most 7 years. For marriages of 30+ years, it may last at most 10 years. (Tex. Fam. Code §§ 8.054–8.055)

New York's Specific Formula

New York uses a unique two-tiered formula based on gross incomes, with an income cap and duration guidelines.

  • New York: The formula depends on whether the payer also pays child support. If the payer does not pay child support, maintenance is calculated as 30% of the payer's gross income minus 20% of the recipient's gross income. If the payer does pay child support, it's 20% of the payer's gross income minus 25% of the recipient's gross income. This formula applies up to a combined income cap of $241,000 (effective March 1, 2026). Duration guidelines suggest 0.15–0.3 times the marriage length for marriages up to 15 years, 0.3–0.4 for marriages up to 20 years, and 0.35–0.5 for marriages over 20 years. (N.Y. Domestic Relations Law § 236(B)(6))

Colorado's Advisory Guideline

Colorado provides an advisory guideline that courts use as a starting point for maintenance calculations, particularly for marriages within a specific length range.

  • Colorado: For marriages of 3–20 years, the advisory guideline suggests maintenance is 40% of the combined monthly adjusted gross income, minus the lower earner's monthly adjusted gross income. If this calculation results in the recipient receiving more than 50% of the combined income, the amount is adjusted so the recipient receives 50%. This guideline applies to combined annual incomes up to $240,000. (C.R.S. § 14-10-114)

Temporary Support Formulas (Pendente Lite)

Some states have formulas specifically for temporary support (alimony pendente lite or spousal support) paid while the divorce case is pending. Post-divorce alimony in these states remains discretionary.

  • New Mexico: Advisory guidelines for temporary support use percentages of gross income. Without children, it's 30% of the payer's gross income minus 50% of the payee's gross income. With children, it's 30% of the payer's gross income minus 50% of the payee's gross income. There is no combined monthly cap. These are advisory guidelines for settlement negotiations; judges are not bound by them at trial. (NMSA § 40-4-7; NM Supreme Court Alimony Guidelines)
  • Pennsylvania: For temporary spousal support or alimony pendente lite, without children, it's 33% of the payer's net income minus 40% of the payee's net income. With children, it's 25% of the payer's net income minus 30% of the payee's net income. There is no combined monthly cap. Post-divorce alimony is discretionary. (231 Pa. Code Rule 1910.16-4)
  • Virginia: For temporary (pendente lite) support, without children, it's 27% of the payer's gross income minus 50% of the payee's gross income. With children, it's 26% of the payer's gross income minus 58% of the payee's gross income. There is a combined monthly cap of $10,000. Post-divorce spousal support is discretionary. (Va. Code § 16.1-278.17:1)

Discretionary Alimony States: The Majority Approach

Most U.S. jurisdictions do not use a statutory formula for calculating alimony. Instead, judges consider a range of factors to determine if alimony is warranted, its amount, and its duration. While there's no formula, many attorneys and courts may use informal rules of thumb or software estimates as a starting point for negotiations.

The following states and the District of Columbia primarily rely on judicial discretion, guided by statutory factors:

What Statutes Leave to the Judge

Even in states with formulas, judges retain significant discretion in several areas. For example:

  • Deviation from Guidelines: Most formulaic states allow judges to deviate from the guideline amount or duration if there are compelling reasons, such as extraordinary expenses, health issues, or significant disparities in earning potential not fully captured by the formula.
  • Income Determination: Judges often have discretion in determining what constitutes "income" for alimony purposes, especially for self-employed individuals or those with fluctuating income. They may also impute income to an underemployed or unemployed spouse.
  • Types of Alimony: Judges decide the type of alimony awarded (e.g., rehabilitative, transitional, permanent, lump-sum). Rehabilitative alimony, common in many states, is typically time-limited and designed to help a spouse become self-supporting.
  • Duration for Long Marriages: While many states cap alimony duration for shorter marriages, long-term marriages (often 20 years or more) frequently allow for indefinite alimony, leaving the exact duration to judicial determination based on the specific circumstances.
  • Specific Factors: All states, even those with formulas, require judges to consider a list of statutory factors when making a final alimony determination. These factors ensure that the unique circumstances of each family are taken into account.

Frequently asked questions

Which states have a statutory formula for alimony?

States with statutory formulas or advisory guidelines include Colorado, Florida, Illinois, Louisiana, Massachusetts, New Hampshire, New York, and Texas. New Mexico, Pennsylvania, and Virginia have formulas for temporary support only.

What is the income cap for alimony in New York?

In New York, the statutory formula for alimony applies to combined gross incomes up to $241,000, effective March 1, 2026. This cap is adjusted biennially.

Does Florida allow permanent alimony?

No, Florida abolished permanent alimony for cases filed on or after July 1, 2023. Durational alimony is now the standard, with its length tied to the marriage duration.

How is alimony duration determined in Illinois?

In Illinois, alimony duration is calculated using a multiplier based on the length of the marriage. For example, a marriage of 5 years or less uses a 0.2 multiplier, while a marriage of 19–20 years uses a 0.8 multiplier. Marriages of 20+ years may have indefinite terms.

What is 'pendente lite' support?

'Pendente lite' support, also known as temporary support, is financial assistance paid by one spouse to the other while a divorce case is ongoing. States like New Mexico, Pennsylvania, and Virginia have specific formulas for this temporary period.

Are judges always bound by alimony formulas?

No. Even in states with statutory formulas, judges typically have the discretion to deviate from the guideline amount or duration if they find a compelling reason to do so, which must usually be justified in their ruling.

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StateTally. (2026). How U.S. States Calculate Alimony: Formula Families (2026). Retrieved September 20, 2026, from https://statetally.com/guides/alimony-formulas-by-state/