Alimony Calculator
Estimate monthly spousal support payments using both partners' incomes and marriage length. Useful for divorcing couples and attorneys planning financial settlements.
About this calculator
Alimony (also called spousal support) compensates the lower-earning spouse after divorce to help maintain a comparable standard of living. This calculator uses the formula: Alimony = ((payerIncome − receiverIncome) × 0.25 / 12) × (1 + marriageYears × 0.05). The base amount is 25% of the income gap, converted to a monthly figure. A marriage-length adjustment factor — 1 + (years × 0.05) — increases support by 5% for each year of marriage, reflecting greater financial dependency in longer unions. For example, a 10-year marriage adds a 50% boost to the base amount. Note that alimony laws vary significantly by state; this formula provides an educational estimate rather than a legal determination. Courts also weigh standard of living, contributions to the marriage, and each party's earning capacity.
How to use
Example: The paying spouse earns $120,000/year; the receiving spouse earns $40,000/year; they were married for 8 years. Step 1: Income gap — $120,000 − $40,000 = $80,000. Step 2: Base monthly amount — $80,000 × 0.25 / 12 = $1,666.67. Step 3: Marriage adjustment — 1 + (8 × 0.05) = 1.40. Step 4: Monthly alimony — $1,666.67 × 1.40 = $2,333.33. This is a ballpark figure; a family law attorney will refine it for your jurisdiction.
Frequently asked questions
How is alimony calculated during a divorce settlement?
Alimony is calculated by examining the income gap between spouses, the length of the marriage, and the recipient's financial need. This calculator uses 25% of the annual income difference converted to a monthly payment, scaled upward for longer marriages. Courts may also consider the marital standard of living, each spouse's age and health, contributions such as homemaking or supporting the other's career, and the payer's ability to pay. Many states use statutory formulas while others leave the amount entirely to judicial discretion.
How long do alimony payments typically last after a divorce?
Alimony duration is usually tied to the length of the marriage. Short marriages under five years may result in temporary support lasting one to two years. Moderate-length marriages of 10–15 years often produce support lasting half the marriage duration. Marriages over 20 years, especially where one spouse left the workforce, can result in indefinite or permanent support. Most alimony orders include a termination clause triggered by remarriage, cohabitation, or a significant change in either party's financial circumstances.
Can alimony be modified after the divorce is finalized?
Yes, alimony can typically be modified if either party experiences a substantial change in circumstances — such as job loss, significant income increase, remarriage of the recipient, or a serious health event. The requesting party must file a motion with the court and provide evidence of the change. Some divorce decrees include automatic modification clauses tied to cost-of-living indexes or specific future events. Consulting a family law attorney before seeking modification is strongly advisable, as courts apply different standards depending on the original order's terms.