Alimony Calculator 2026 — State Formulas, Duration, and Amount Estimator

The three alimony math models states use

Every state handles alimony differently, but the formulas fall into three buckets:

• Income difference formula (most common): Payor pays a percentage of income gap. Example: New York uses 20% of payor income minus 25% of payee income (below $203K combined). Illinois uses 33.3% of payor minus 25% of payee, capped so the recipient never exceeds 40% of combined net income.
• Need + ability to pay (traditional): Judge reviews recipient's budget of reasonable expenses versus their income shortfall, then checks payor's ability to pay. Used in Texas, Georgia, South Carolina, and North Carolina. Harder to predict; more variable outcomes.
• Hybrid: California uses a strict formula for temporary (pendente lite) alimony but leaves long-term alimony to judicial discretion based on 14 statutory factors. Florida uses no formula but lists marriage-length brackets with presumptive amounts.

Worked example: 15-year marriage, income gap

Spouse A earns $180,000/yr. Spouse B earns $45,000/yr (part-time after raising kids). State: Illinois.

• 33.3% × $180,000 = $59,940
• 25% × $45,000 = $11,250
• Guideline alimony: $59,940 − $11,250 = $48,690/yr, or $4,058/month
• Duration: 15 years × 0.80 factor for 15-20 year marriages = 12 years of payments
• Total exposure: ~$584,280 over 12 years (before any modification or termination)

In a need-based state like Texas, the same couple might see $2,500-$3,500/mo for 5-7 years — Texas caps alimony duration and typically limits amount to 20% of payor's gross income or $5,000/mo, whichever is lower.

What drives the amount up or down

Beyond the formula, courts consider:

• Standard of living during the marriage. Courts aim to keep the recipient in a similar lifestyle when feasible. Lavish lifestyles during marriage create upward pressure.
• Earning capacity vs actual income. If a spouse is "voluntarily underemployed" (quit a $90K job to work part-time during divorce), courts impute the earning capacity.
• Contributions to career of the other spouse. A spouse who supported the other through medical school, law school, or career building has a stronger alimony case.
• Age and health. A 58-year-old recipient with health issues will likely receive more and longer support than a 32-year-old in good health.
• Marital misconduct. In fault states (NC, SC, GA, VA), adultery or abandonment can bar or reduce alimony.
• Custody of minor children. Primary custodial parent with young kids often gets enhanced alimony because full-time work is constrained.

State-by-state quick reference

• California: Guideline formula for temporary only. Long-term uses 14 factors. Marriages under 10 years: support typically half the marriage length. Marriages over 10 years: indefinite support possible.
• Texas: Strict eligibility (10+ year marriage OR domestic violence conviction). Capped at lesser of 20% payor gross or $5,000/mo. Duration capped at 5-10 years depending on marriage length.
• New York: Formula-based up to $203,000 combined income cap. Duration: 15-30% of marriage length for under 15 years; 30-40% for 15-20 years; 35-50% for 20+ years.
• Florida: As of 2023, no more permanent alimony. Brackets: short marriage (under 10 yrs) = bridge-the-gap or rehabilitative; moderate (10-20 yrs) = durational up to 60% of marriage length; long (20+ yrs) = durational up to 75%.
• Illinois: Formula-based. 33.3% payor minus 25% payee, capped so recipient receives no more than 40% of combined net income. Duration: percentage of marriage length increasing with duration.
• Massachusetts: Durational formula based on marriage length brackets. 5 years = up to 50% of months; 10 years = up to 60%; 15 years = up to 70%; 20+ years = up to 80% or until retirement age.

Tax treatment: the 2019 rule change

The Tax Cuts and Jobs Act of 2017 (effective for divorces finalized after December 31, 2018) eliminated the alimony tax deduction for payors. For modern divorces:

• Payor: cannot deduct alimony from federal taxes
• Recipient: does not report alimony as federal taxable income
• Effect: payors pay with after-tax dollars, which reduced average alimony awards by 15-20% because judges and settlement math adjusted

Pre-2019 orders retain the old tax treatment unless modified after January 1, 2019 in a way that specifies the new rules apply. This is a subtle but expensive trap in modifications.

Negotiation leverage points

If you're negotiating a settlement rather than going to trial, these levers change the payment schedule:

• Lump sum buyout. Paying 70-80% of projected total value upfront in exchange for no monthly payments. Useful when payor expects income growth or wants clean break.
• Declining schedule. Higher payments in year 1-3 while recipient retrains, then lower. Signals expectation of self-sufficiency.
• Property trade-off. Transferring the house, retirement assets, or business equity in lieu of alimony. Watch capital gains consequences.
• Cohabitation clause. Specify exact triggers for termination (overnight stays per month, shared utility bills, etc.) to avoid future litigation.
• Non-modifiable alimony. Both sides can agree alimony won't change regardless of circumstance. Protects against payor's income growth or recipient's future needs.

Red flags the court watches for

• Sudden "unemployment" or business revenue drop during divorce — imputed income is the standard fix.
• Unreported cash income or crypto holdings. Forensic accountants earn $250-$450/hr to find them.
• Luxury purchases paid from business accounts just before filing.
• Transfers to family members or new partners within 12 months of filing.
• Overstated expenses on financial disclosures — sworn statements carry perjury exposure.