Alimony Calculator
Estimate spousal support payments based on income disparity, marriage length, and state guidelines.
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer
Alimony Calculator
Calculator
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Formula: Alimony = f(Payer Income, Recipient Income, Method) x Child Adjustment
Worked example — Monthly Alimony: $2,333 | Duration: 10.5 years | Total: ~$294,000
Formula
Alimony = f(Payer Income, Recipient Income, Method) x Child Adjustment
Alimony is calculated using one of several methods: Income Shares (30% of payer income minus 20% of recipient income), AAML (1/3 of income difference, capped at 40% of combined), or Percentage of Difference (30% of income gap). An adjustment reduces alimony 5% per child to account for child support obligations.
Worked Examples
Example 1: 15-Year Marriage, Significant Income Gap
Problem:Payer earns $120,000/year, recipient earns $40,000/year. Married 15 years, no children. Using income shares method.
Solution:Income Shares: ($120,000 x 0.30) - ($40,000 x 0.20) = $36,000 - $8,000 = $28,000/yr Monthly: $28,000 / 12 = $2,333/mo Duration: 15 years x 0.7 = 10.5 years Total payments: $2,333 x 126 months = $293,958 Payer net monthly: $10,000 - $2,333 = $7,667 Recipient net monthly: $3,333 + $2,333 = $5,666
Result:Monthly Alimony: $2,333 | Duration: 10.5 years | Total: ~$294,000
Example 2: Short Marriage with Children
Problem:Payer earns $90,000, recipient earns $30,000. Married 4 years with 2 children. Using AAML formula.
Solution:Income difference: $90,000 - $30,000 = $60,000 AAML: $60,000 / 3 = $20,000/yr 40% cap check: Combined $120,000 x 0.40 = $48,000 - $30,000 = $18,000 (capped) Child adjustment: $18,000 x (1 - 0.10) = $16,200/yr = $1,350/mo Duration: 4 years x 0.5 = 2.0 years Total: $1,350 x 24 = $32,400
Result:Monthly Alimony: $1,350 | Duration: 2.0 years | Total: ~$32,400
Frequently Asked Questions
How is alimony calculated in the United States?
Alimony calculation varies significantly by state as there is no single federal formula. Some states like Massachusetts, Colorado, and Illinois have specific guideline formulas, while others give judges broad discretion to consider factors like income disparity, marriage duration, standard of living during marriage, age and health of both spouses, and earning capacity. Common approaches include the income shares method (30% of payer income minus 20% of recipient income), the AAML formula (one-third of the income difference capped so recipient does not exceed 40% of combined income), and simple percentage of difference methods. Courts also consider non-financial contributions like homemaking and child-rearing. Most states distinguish between temporary, rehabilitative, and permanent alimony.
How long does alimony last after divorce?
Alimony duration typically depends on the length of the marriage. Short-term marriages under five years usually result in alimony lasting half the marriage duration or less, primarily to help the lower-earning spouse transition to financial independence. Medium-term marriages of five to twenty years often result in alimony lasting sixty to seventy percent of the marriage duration, providing time for education, career development, or retraining. Long-term marriages of twenty years or more frequently result in indefinite or permanent alimony, especially when one spouse has been out of the workforce for decades. Many states have moved toward rehabilitative alimony that includes specific goals and timelines rather than open-ended support. Alimony typically terminates upon the death of either party or remarriage of the recipient.
Is alimony tax deductible after the 2017 Tax Cuts and Jobs Act?
For divorce or separation agreements executed after December 31, 2018, alimony payments are no longer tax-deductible for the paying spouse and no longer counted as taxable income for the receiving spouse under the Tax Cuts and Jobs Act (TCJA). This was a major change from prior law where the payer could deduct alimony and the recipient reported it as income. Agreements executed before January 1, 2019 are grandfathered under the old rules unless specifically modified to adopt the new rules. This change significantly impacts alimony negotiations because the payer now bears the full tax burden. For example, paying $2,000 monthly in alimony now costs the payer the full $2,000 after tax, whereas previously a payer in the 24% bracket effectively paid only $1,520 after the tax deduction.
Can alimony be modified after the divorce is finalized?
Yes, alimony can be modified in most states if there is a substantial change in circumstances for either party. Common grounds for modification include significant job loss or income reduction of the payer, substantial income increase of the recipient, retirement of the payer at a reasonable age, serious illness or disability affecting either party, or cohabitation of the recipient with a new partner. The party seeking modification must petition the court and demonstrate that the change is substantial, involuntary, and ongoing rather than temporary. Some divorce agreements include specific modification clauses or may state that alimony is non-modifiable, which courts generally uphold. It is important to continue making payments at the original amount until a court officially approves any modification.
What is the difference between alimony, spousal support, and maintenance?
Alimony, spousal support, and spousal maintenance are essentially the same concept with different names used in different jurisdictions. Alimony is the traditional legal term most commonly used in Eastern and Southern US states and in older legal texts. Spousal support is the preferred modern term in many Western states including California and is considered more gender-neutral. Maintenance is the term used in states like New York, Illinois, and Colorado, and it is also the standard term in the Uniform Marriage and Divorce Act. Regardless of terminology, all three refer to court-ordered payments from one former spouse to another following separation or divorce, intended to address economic inequality resulting from the marriage. The legal standards, calculation methods, and duration rules are determined by state law regardless of which term is used.
How is alimony or spousal support determined?
Courts consider the length of marriage, each spouse's income and earning capacity, standard of living during marriage, age and health of both parties, and contributions to the marriage (including homemaking). Duration often correlates with marriage length: short marriages may get temporary support while long marriages may receive indefinite support.
References
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer · Editorial policy
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