There’s no single national formula, but the most widely cited benchmark for how much alimony you will have to pay is the American Academy of Matrimonial Lawyers guideline: 30% of your gross income minus 20% of your spouse’s gross income, with the recipient’s total income capped at 40% of your combined earnings. That produces a ballpark, not a verdict. Your actual number depends on the state you divorce in, how long you were married, each spouse’s earning power, and what a judge makes of the facts. Some states have their own formulas; others leave the amount almost entirely to judicial discretion.
Running the Numbers on the Common Formula
The AAML formula is a starting point many attorneys use in negotiations. It doesn’t apply when the couple’s combined gross income exceeds $1,000,000 per year.1American Academy of Matrimonial Lawyers. Considerations for Calculating Alimony, Spousal Support, Maintenance
Say you earn $120,000 and your spouse earns $40,000. The raw formula gives you $36,000 minus $8,000, or $28,000 per year in alimony. Then you check the cap. Your spouse’s total income with that alimony would be $68,000, which is 42.5% of the $160,000 you earn together. That’s over the 40% cap of $64,000, so the award drops to $24,000 to bring your spouse’s total to the ceiling.
No state is required to follow this formula, and plenty of judges don’t. Treat it as a rough estimate for your own planning, not a prediction of what a court will order.
How Long You’ll Pay
The AAML guideline also suggests duration tied to the length of the marriage:
- Marriages of 0–3 years: multiply the marriage length by 0.3
- 3–10 years: multiply by 0.5
- 10–20 years: multiply by 0.75
- Over 20 years: the guideline suggests permanent alimony
A 12-year marriage under this framework produces roughly 9 years of payments.1American Academy of Matrimonial Lawyers. Considerations for Calculating Alimony, Spousal Support, Maintenance
The type of award a court chooses also drives duration. Temporary alimony covers only the period while the divorce is pending and ends when the divorce is finalized. Rehabilitative alimony, the most common in shorter marriages, gives the recipient a defined window to get education, training, or work experience needed to become self-supporting, usually with a specific plan and end date. Long-term or “permanent” alimony is reserved mostly for long marriages where one spouse is unlikely to reach full financial independence because of age, health, or extended time out of the workforce; the label is misleading because these awards can still be modified. Reimbursement alimony is a narrower category that compensates a spouse who financially supported the other through advanced education or professional training.
What Actually Moves the Number Up or Down
Once a court decides alimony is warranted, judges weigh a set of statutory factors. The list is similar across states, though emphasis varies.
- Income and earning capacity. Current paychecks matter, but a spouse with an unused professional license may be assessed at a higher earning level than what they currently make.
- Standard of living during the marriage. This is a benchmark, not a mandate to replicate the marital lifestyle dollar for dollar. The goal is to avoid a dramatic drop for the lower earner while the higher earner’s life stays largely unchanged.
- Length of the marriage. Longer marriages produce larger or longer-lasting awards. A two-year marriage rarely justifies years of support; a twenty-five-year marriage often does.
- Age and health. A 55-year-old with chronic health issues faces a different re-entry to the workforce than a healthy 35-year-old, and courts weigh whether realistic self-sufficiency is achievable.
- Contributions to the marriage. Homemaking, childcare, and supporting the other spouse’s career all count, even without a paycheck to show for them.
- Marital assets and debts. A spouse who received a larger share of property may receive less alimony. The overall settlement is considered as a package.
When a Court Calculates on What You Could Earn
If a judge believes you’re voluntarily unemployed or deliberately underearning to shrink your obligation, the court can “impute” income to you. That means alimony is calculated on what you’re capable of earning based on your education, credentials, work history, and the local job market, not on your current paycheck. The same analysis can cut the other way: if the recipient could reasonably work but chooses not to, the court can lower the award based on that potential income.
This is where disputes get contentious. Vocational evaluations, which are professional assessments of employability, sometimes get ordered so the court has objective data instead of competing claims. Evaluators look at skills, credentials, health limitations, and actual openings in the local market.
Taxes Change What It Really Costs You
The tax treatment shifted permanently in 2019, and it matters for how much alimony actually costs.
For agreements executed after 2018, alimony is not deductible by the payer and not taxable income for the recipient.2Internal Revenue Service. Topic no. 452, Alimony and Separate Maintenance If you’re paying $2,000 a month, the full $2,000 comes out of your after-tax dollars with no write-off. Your ex receives it tax-free.
For agreements executed before 2019 that haven’t been modified, the old rules still apply: you deduct the payments, and your ex reports them as income. If you later modify a pre-2019 agreement, the new tax treatment only kicks in if the modification expressly states that the repeal of the alimony deduction applies.2Internal Revenue Service. Topic no. 452, Alimony and Separate Maintenance Without that language, the original treatment continues.
The change matters for negotiation. Under the old rules, the deduction effectively subsidized the payer, which made higher amounts easier to swallow. Without that subsidy, some attorneys factor the lost deduction into settlement discussions.
How the Amount Can Change Later
An alimony order isn’t necessarily fixed, even when it’s labeled long-term. Either spouse can ask the court to modify or end it, but you have to show a substantial change in circumstances that wasn’t anticipated when the original order was made.
Courts routinely consider involuntary job loss, a significant and lasting reduction in income, serious illness or disability, and the paying spouse’s retirement. Retirement doesn’t automatically end the obligation. In most states, reaching retirement age is treated as a change in circumstances that justifies filing a modification request, but the court still weighs whether the recipient can support themselves without the payments. Some divorce agreements include specific retirement provisions that spell out what happens at a certain age, which avoids going back to court.
Certain events trigger automatic termination in virtually every state: the death of either spouse, or the recipient’s remarriage. Cohabitation is more nuanced. Many states allow the paying spouse to seek a reduction or termination if the recipient is living with a new partner in a marriage-like arrangement that reduces their financial need. The burden falls on you to prove the cohabitation is genuinely supportive rather than casual, which typically means showing shared expenses, joint accounts, or other financial interdependence.
A prenuptial or postnuptial agreement can waive or limit alimony entirely, provided it was signed voluntarily, with full financial disclosure, and without coercion. Courts in most states enforce these waivers unless the result would shock the conscience, which is a high bar.
What Nonpayment Actually Costs
Alimony is a court order. If you stop paying without going back to court first, expect a contempt proceeding, which can produce fines, an order to pay the recipient’s attorney fees, and in stubborn cases jail time until you comply.
Wage garnishment is the most direct enforcement tool. Federal law caps garnishment for support at 50% of your disposable earnings if you’re supporting another spouse or child, or 60% if you’re not. If you’re more than 12 weeks behind, an additional 5% can be taken.3Office of the Law Revision Counsel. 15 USC 1673 – Restriction on Garnishment Those ceilings are higher than the 25% cap that applies to ordinary consumer debts.4U.S. Department of Labor. Fact Sheet 30 – Wage Garnishment Protections of the Consumer Credit Protection Act States add their own tools: bank account seizure, property liens, tax refund interception, and suspension of driver’s, business, or professional licenses. Unpaid alimony can accrue interest and be reported to credit bureaus. If you genuinely can’t afford your payments, file for modification. Stopping payments and hoping no one notices is the most expensive option on the table.