There is no single typical alimony percentage that applies nationwide. In the minority of states that use guideline formulas, the calculation generally takes 20% to 40% of the higher earner’s income and subtracts a percentage of the lower earner’s income, with most of those states capping the recipient’s total income at 40% of what the couple earns combined. Most states use no formula at all and leave the amount to a judge weighing factors like marriage length, income gap, and each spouse’s needs.
Why No National Percentage Exists
Family law is a state matter. Each state writes its own statutes and case law on spousal support, and the terminology shifts too: alimony in one state, spousal maintenance or spousal support in another. Most states hand judges a list of factors rather than a formula, so the outcome depends on how a particular judge reads the evidence. Two courtrooms in the same state can produce noticeably different numbers from similar facts, which is why any claim of a standard percentage overstates what the law actually provides.
The Percentages Formula States Use
A minority of states have adopted guideline formulas, and these are the closest thing to a real alimony percentage. The structure is consistent across them: take a percentage of the higher earner’s income, subtract a percentage of the lower earner’s, and the difference is the guideline amount.
The specific numbers vary. Some states use 40% of the higher earner’s income minus 50% of the lower earner’s. Others use 33% minus 25%, or 25% minus 30%. A widely referenced model from the American Academy of Matrimonial Lawyers uses 30% of the payor’s gross income minus 20% of the recipient’s gross income. No two formula states have landed on the same figures.
Most formula states layer a cap on top: the recipient’s total income, meaning their own earnings plus alimony, cannot exceed 40% of the couple’s combined income. That cap stops the lower earner from ending up with more disposable income than the person paying.
A Worked Example
Say one spouse earns $120,000 and the other earns $40,000, and the formula follows the AAML’s 30%/20% approach. The starting figure is ($120,000 × 0.30) minus ($40,000 × 0.20), or $36,000 minus $8,000, which equals $28,000 per year. Then the cap check: $40,000 plus $28,000 is $68,000, which is 42.5% of the couple’s combined $160,000. Since that exceeds 40%, the award gets trimmed so the recipient’s total comes to $64,000, bringing the alimony down to $24,000 per year.
Even in formula states, judges almost always keep authority to deviate when the formula produces an unfair result. Some states apply their formula only up to a certain income threshold and leave everything above that to discretion. These formulas also tend to govern temporary or guideline support; the final award after a trial can look different.
What Drives the Number in Discretionary States
In states without formulas, and as a supplement in states that have them, judges weigh a list of factors:
- Marriage length. Longer marriages produce larger and longer-lasting awards. A 25-year marriage where one spouse stayed home carries far more weight than a three-year marriage between two working professionals.
- Income and earning capacity. The gap between what each spouse earns, or could earn, drives most of the analysis.
- Standard of living during the marriage. Courts use this as the benchmark, aiming to keep both spouses reasonably close to the lifestyle they shared.
- Age and health. A 60-year-old with chronic health problems has different prospects than a healthy 35-year-old.
- Non-financial contributions. Raising children, running the household, or supporting the other spouse’s career all count.
- Sacrificed career opportunities. A spouse who left the workforce or turned down advancement to support the family will likely get credit for that trade-off.
Roughly half of all states also consider marital misconduct, and the weight it carries varies widely. In some states, adultery can eliminate alimony entirely if it caused the divorce. In others, fault matters only when it damaged the couple’s finances, such as an affair involving spent-down marital accounts. A few states ignore misconduct completely.
When minor children are involved, spousal support and child support interact. Most states calculate alimony first and then determine child support, because the alimony payment changes both spouses’ incomes for child-support purposes. Some states cap the combined total of both obligations, meaning a large child-support order can reduce what’s available for alimony. In practical terms, the effective alimony percentage for parents often runs below what the formulas alone suggest.
How Long Payments Last
Duration usually tracks marriage length. Some states tie alimony duration to a percentage of how long the marriage lasted: roughly 20–25% for marriages under five years, 45–65% for marriages of 10 to 15 years, and 100% or indefinite support for marriages of 20 years or more.
These are guidelines, not guarantees. A 12-year marriage where one spouse hasn’t worked in a decade will usually produce a longer award than a 12-year marriage where both spouses kept their careers going. Judges weigh the same factors that shape the dollar amount when deciding duration. Rehabilitative alimony, the most commonly awarded type, ends when the recipient finishes the education or training that justified the award. Permanent alimony, reserved for long marriages where one spouse is unlikely to become self-supporting, can still be modified if circumstances change substantially.
When the Percentage Is Based on What You Could Earn
If either spouse is voluntarily unemployed or working well below capacity, the court can impute income. The judge assigns an earning figure based on the person’s education, skills, and work history, then runs the alimony calculation off that number rather than actual pay. This comes up often when a spouse quits a job or takes a sharp pay cut around the time of divorce.
A vocational evaluator is frequently brought in. The expert reviews credentials, health, and the local job market, then produces a report estimating realistic earning potential. If the evaluator concludes a spouse could earn $50,000 after a few months of retraining, the court can use that figure even if the spouse currently earns nothing. The point is to prevent either side from gaming the formula by underreporting what they can make.
How Taxes Change the Real Percentage
Tax treatment has a direct effect on what a given alimony percentage actually costs the payor and nets the recipient. The rules changed in 2019. Congress repealed the longstanding alimony deduction as part of the Tax Cuts and Jobs Act.1Office of the Law Revision Counsel. 26 USC 71 – Repealed
For any divorce or separation agreement finalized after December 31, 2018, alimony is not deductible by the payor and not taxable to the recipient.2Internal Revenue Service. Divorce or Separation May Have an Effect on Taxes The money moves as after-tax dollars from one person to the other.
For agreements finalized on or before December 31, 2018, the old rules still apply: the payor deducts the payments and the recipient reports them as income. If you modify a pre-2019 agreement after that date, the new rules only apply when the modification expressly says the TCJA repeal applies. A routine modification that doesn’t reference the tax change keeps the original treatment.3Internal Revenue Service. Topic No. 452, Alimony and Separate Maintenance
This shift matters in negotiation. Under the old rules, the deduction created a combined tax savings that effectively subsidized larger awards. Under current law there’s no tax benefit to either side, which often pulls down the total amount payors agree to. When you’re evaluating any proposed alimony figure, read it as take-home dollars.
When Alimony Changes or Ends
Alimony ends automatically in most states when either spouse dies or when the recipient remarries. A court-ordered end date, if one was set, also terminates the obligation. In most states, the recipient moving in with a new romantic partner creates grounds for termination or reduction; courts look at whether the couple shares expenses, how long the arrangement has lasted, and whether it functions like a marriage.
Either spouse can ask the court to modify the amount if circumstances have substantially changed. The common triggers are the payor losing a job or taking a major income cut, the recipient’s income rising significantly, or a serious health change on either side.
Retirement is its own category. Reaching retirement age does not automatically end alimony, but it is widely recognized as a substantial change that justifies modification. Some states create a presumption that alimony ends when the payor reaches full retirement age, putting the burden on the recipient to argue otherwise. In states without that presumption, the payor has to show the retirement is reasonable and in good faith rather than a strategy to escape the obligation. Courts won’t modify alimony where the payor has voluntarily cut income to avoid paying, which is where imputed income returns to the analysis.
One boundary worth knowing: couples can override state defaults entirely through a prenuptial or postnuptial agreement. A valid, properly disclosed agreement can set a flat amount, tie payments to a percentage of income, or waive alimony altogether, and it will generally control over whatever formula or factors the state would otherwise apply.