Alimony Calculator
Estimate monthly spousal support using a common guideline formula.
⚠️ This is a rough educational estimate only, not legal advice. Actual alimony amounts and duration vary significantly by state, judge, and case specifics — consult a licensed family law attorney.
How this guideline alimony formula works
Several states informally reference a "rule of thumb" style formula in their guideline worksheets (versions of this general approach have appeared in states like Illinois and Pennsylvania) to produce a starting figure for spousal support negotiations. A common version takes 30% of the higher earner's gross monthly income, subtracts 20% of the lower earner's gross monthly income, and floors the result at zero. This calculator uses that same general approach to produce an illustrative monthly estimate.
Why marriage length changes the duration, not just the amount
Beyond the monthly amount, how long alimony is paid typically depends heavily on how long the couple was married. Shorter marriages (under 5 years) often see support paid for a much smaller fraction of the marriage length, roughly 20% in many informal guidelines, while marriages of 5-10 years might see around 30%, and 10-20 years around 40%. For marriages over 20 years, many states allow for "indefinite" or long-term support with no fixed end date, since courts recognize that a long marriage may have significantly altered a spouse's earning capacity.
Factors that move alimony up or down in reality
Judges weigh many factors beyond a simple formula: each spouse's earning capacity and career sacrifices made during the marriage, health and age, the standard of living established, child custody arrangements, and any prenuptial agreements. Some states have moved away from formulaic guidelines entirely in favor of judicial discretion. This is a rough educational estimate only, not legal advice — actual alimony amounts and duration vary significantly by state, judge, and case specifics, so consult a licensed family law attorney for guidance specific to your situation.
Frequently Asked Questions
Is this the exact amount a court will order?
No. This is a rough educational estimate based on a commonly referenced rule-of-thumb formula, not a legally binding calculation. It is not legal advice. Actual alimony amounts and duration vary significantly by state, judge discretion, and case specifics — consult a licensed family law attorney for an accurate figure.
What formula does this calculator use?
It uses a commonly published rule-of-thumb approach: 30% of the higher earner's gross monthly income minus 20% of the lower earner's gross monthly income, floored at zero. Versions of this general formula have appeared in guideline worksheets in states like Illinois and Pennsylvania, though exact rules vary.
How long will I have to pay or receive alimony?
Duration often scales with how long the marriage lasted. Common informal guidelines suggest around 20% of the marriage length for marriages under 5 years, 30% for 5-10 years, and 40% for 10-20 years. Marriages over 20 years may qualify for indefinite support with no fixed end date in many states.
Does this work for my specific state's alimony guidelines?
This calculator uses a general rule-of-thumb formula referenced informally in some states, not your state's official guideline. Many states give judges broad discretion instead of a fixed formula, so treat this as a rough national approximation rather than a state-specific calculation.
Is alimony taxable?
For divorces finalized after 2018, alimony is no longer tax-deductible for the payer or taxable income for the recipient under federal law. Older agreements may still follow the previous tax treatment. Consult a tax professional about your specific situation.
Can alimony be changed after it's ordered?
In many states, alimony can be modified if there's a significant change in either party's income or circumstances, and it often terminates automatically upon the recipient's remarriage or in some cases cohabitation with a new partner. Rules vary significantly by state and by the original court order's terms.
What factors can change my real alimony amount besides income and marriage length?
Judges commonly consider each spouse's earning capacity, health, age, career sacrifices made for the marriage or children, the marital standard of living, and child custody arrangements. These factors can move a real award well above or below a simple formula-based estimate.
What does "indefinite alimony" mean?
For long marriages (often 20+ years), some states allow support to continue without a predetermined end date rather than a fixed number of years, though it can still be modified or terminated later based on changed circumstances such as retirement or remarriage.