Alimony Calculator
Estimate spousal support payments based on income disparity, marriage length, and state guidelines.
Calculator
Adjust values & calculateMethod Comparison (Monthly)
Formula
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.
Last reviewed: December 2025
Worked Examples
Example 1: 15-Year Marriage, Significant Income Gap
Example 2: Short Marriage with Children
Background & Theory
The Alimony Calculator applies the following established principles and formulas. Legal and compliance calculations form the quantitative backbone of risk management across every industry. Statute of limitations periods define the window within which legal action must be initiated; missing these deadlines extinguishes claims permanently regardless of their merit. Periods vary widely by jurisdiction and claim type: contract disputes typically allow 3-6 years, personal injury claims 2-3 years, and written contracts may allow up to 10 years in some states. Calculating expiry dates requires identifying the triggering event, applying the statutory period, and accounting for tolling provisions that pause the clock during minority, incapacity, or fraudulent concealment. Employment law generates substantial calculation requirements. The Fair Labor Standards Act mandates overtime pay at 1.5 times the regular rate for hours worked beyond 40 in a workweek. Regular rate calculation is not simply the hourly wage; it must incorporate non-discretionary bonuses, shift differentials, and commissions, divided by total hours worked. Workers' compensation premiums are computed as payroll divided by 100, multiplied by the applicable class code rate, adjusted by an experience modification factor reflecting the employer's historical claims. GDPR and similar data privacy regulations impose specific retention and deletion timelines. Personal data may not be kept longer than necessary for its original purpose, requiring organisations to maintain deletion schedules and document the legal basis for each data category. Regulatory filing deadlines in financial services, environmental compliance, and healthcare are typically expressed in business days, necessitating accurate weekday and holiday calendars. Legal cost-benefit analysis quantifies litigation risk by multiplying potential damages by probability of adverse judgment, comparing expected loss against settlement or compliance investment. Liability insurance premiums reflect actuarial assessments of this expected loss, modified by coverage limits, deductibles, and risk management practices. Compliance programmes that demonstrably reduce violation probability directly reduce premium costs and regulatory exposure.
History
The history behind the Alimony Calculator traces back through the following developments. The formalisation of legal obligations through written codes began with the Code of Hammurabi around 1754 BCE in ancient Babylon. Carved onto a basalt stele, it established 282 laws governing commerce, property, and personal conduct, notably applying proportional penalties based on social status. The principle that legal consequences follow determinable formulas rather than arbitrary judgment traces directly to this tradition. Roman law provided the systematic framework that shaped Western legal systems. The Twelve Tables (450 BCE) codified customary law for public access, and the Corpus Juris Civilis compiled by Emperor Justinian in 529-534 CE synthesised centuries of legal development into an authoritative reference that influenced European jurisprudence for a millennium. Magna Carta in 1215 established the revolutionary principle that even monarchs were subject to law, laying the groundwork for due process, proportional punishment, and the right to a fair hearing. English common law evolved through judicial decisions rather than codification, creating a precedent-based system that spread through British colonisation to become the legal foundation of the United States, Canada, Australia, and India. The Napoleonic Code of 1804 revived the Roman codification tradition, systematising French civil law and inspiring legal reforms across continental Europe, Latin America, and parts of Africa. Its clear structure influenced how modern compliance regulations are drafted. The New Deal era of the 1930s dramatically expanded the American regulatory state, creating agencies like the SEC, NLRB, and FDA with broad rulemaking authority. This expansion made compliance a distinct professional discipline. The Sarbanes-Oxley Act of 2002, passed in response to Enron and WorldCom scandals, institutionalised compliance functions within public companies by mandating internal controls, audit committees, and executive certification of financial statements. GDPR's implementation in 2018 similarly professionalised data protection compliance globally, creating an entirely new category of compliance calculation centred on data lifecycle management.
Frequently Asked Questions
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\nMonthly: $28,000 / 12 = $2,333/mo\nDuration: 15 years x 0.7 = 10.5 years\nTotal payments: $2,333 x 126 months = $293,958\nPayer net monthly: $10,000 - $2,333 = $7,667\nRecipient 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\nAAML: $60,000 / 3 = $20,000/yr\n40% cap check: Combined $120,000 x 0.40 = $48,000 - $30,000 = $18,000 (capped)\nChild adjustment: $18,000 x (1 - 0.10) = $16,200/yr = $1,350/mo\nDuration: 4 years x 0.5 = 2.0 years\nTotal: $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.
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.
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy