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Alimony Calculator

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Estimate spousal support payments based on income differential and marriage length. For informational purposes — alimony varies significantly by state and judge.

⚖️ Spousal Support✔ Income-Based🇺🇸 US Guidelines

💍 Alimony Calculator (Spousal Maintenance)

Results update instantly

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Estimated Monthly Alimony
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Guideline estimate — courts have broad discretion
Monthly Amount
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Annual Amount
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Est. Duration
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Total Estimated
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⚠️ Alimony is highly discretionary. Courts consider earning capacity, standard of living, age, health, and many other factors. This is a rough educational estimate only.

How to Use the Alimony Calculator

1

Enter both spouses' monthly incomes

Input gross monthly earnings before tax for both the paying and receiving spouse. These are the most influential figures in any alimony calculation.

2

Enter the marriage length

Input the number of years married. Courts use this directly — longer marriages typically result in higher amounts and longer payment duration.

3

Select your jurisdiction

Choose US, UK, or South Africa. Each jurisdiction has different calculation methods — US uses income-based formulas, UK uses needs-based assessment, SA uses the Divorce Act.

4

Review the estimate

Use the result as a planning figure, not a legal outcome. Alimony is ultimately decided by a court weighing multiple factors. Consult a family law attorney for your specific situation.

How Alimony Is Calculated

There is no single universal alimony formula — courts in most common-law jurisdictions have broad discretion. However, several states (including California and New York) use guideline formulas as starting points. A common rough guideline: 40% of the higher earner's net income minus 50% of the lower earner's net income.

Duration Guidelines

Alimony duration is often tied to marriage length. Common guidelines: short marriages (under 5 years): 30–50% of marriage length; medium (5–10 years): 40–60%; long marriages (10+ years): indefinite or 50–100% of marriage length in some states. Some jurisdictions (e.g., Massachusetts) use a strict formula tied to marriage length.

📐 Common Alimony Estimate Formula

Support ≈ (Higher Income − Lower Income) × 30–40%
Duration Typically ⅓ to ½ of marriage length for long-term marriages
Amount Courts balance standard of living during marriage vs. each spouse's earning capacity
Note No universal formula — courts have broad discretion. This estimate is indicative only.

Alimony: A Complete Guide to Spousal Support

Alimony — also called spousal support or spousal maintenance — is a court-ordered payment from one spouse to another following separation or divorce. Its purpose is to limit the unfair economic effects of divorce, particularly where one spouse sacrificed career advancement for the benefit of the family or the marriage.

Types of Alimony

Courts recognise several distinct types of alimony, each serving a different purpose:

Temporary alimony (alimony pendente lite) is paid during divorce proceedings to maintain the lower-earning spouse's financial position until a final order is entered. It ends when the divorce is finalised.

Rehabilitative alimony is the most common type in modern divorces. It provides financial support for a defined period to allow the receiving spouse to become self-supporting — completing education, obtaining job training, or re-entering the workforce. Courts typically set a specific end date or tie termination to achieving specific milestones.

Reimbursement alimony compensates a spouse who supported the other through professional education or career advancement during the marriage. If one spouse worked to put the other through medical school, for example, reimbursement alimony recognises that economic contribution.

Permanent alimony has become increasingly rare and is generally reserved for long marriages where the receiving spouse is unlikely to achieve financial independence due to age, disability, or decades out of the workforce. Even "permanent" alimony typically ends on remarriage of the recipient or death of either party.

Lump sum alimony substitutes a single payment for ongoing monthly support. It provides certainty for both parties and eliminates the need for ongoing enforcement, but requires the paying spouse to have sufficient liquid assets.

Factors Courts Consider

Unlike child support — which follows strict formula-based guidelines in most states — alimony calculations involve significant judicial discretion. Courts weigh a combination of factors that vary by state:

The length of the marriage is the single most significant factor. Short marriages (under 5 years) rarely result in long-term alimony. Long marriages (20 or more years) are far more likely to generate open-ended or permanent support obligations. Most states treat 10 years as a rough threshold dividing short from long-term marriages for alimony purposes.

Standard of living during the marriage establishes the benchmark. Courts aim to allow both parties to maintain a reasonably comparable lifestyle, recognising that divorce inevitably reduces the combined household's purchasing power. Each party's earning capacity matters more than current earnings — a spouse who chose not to work may be expected to re-enter the workforce.

Contributions to the marriage include both economic and non-economic contributions. A spouse who raised children and managed the household while the other built a career made a real economic contribution that courts recognise and value.

Tax Treatment After TCJA

The Tax Cuts and Jobs Act of 2017 fundamentally changed the tax treatment of alimony. For divorce agreements executed after 31 December 2018: alimony payments are no longer deductible by the paying spouse and are no longer taxable income to the receiving spouse. This is a significant reversal of the prior rules and affects settlement negotiations — the after-tax cost of alimony is now higher for the paying spouse, which has driven courts and negotiators toward lump-sum settlements and property division in lieu of ongoing support.

Agreements executed before 1 January 2019 retain the old treatment unless the parties execute a written modification that expressly adopts the new rules.

Modification and Termination

Alimony orders are not permanent fixtures. Either party can petition for modification if there has been a substantial and continuing change in circumstances — a significant increase or decrease in either party's income, retirement, serious illness, or cohabitation of the recipient with a new partner. Remarriage of the recipient automatically terminates most alimony orders under state law. Always consult a family law attorney before stopping payments unilaterally — doing so without a court order can result in contempt proceedings.

Frequently Asked Questions

Alimony (spousal support) is paid to an ex-spouse to maintain their standard of living after divorce. Child support is paid specifically for the financial needs of the children. Key tax difference: for divorces finalized after December 31, 2018, alimony is neither deductible for the payer nor taxable for the recipient under the Tax Cuts and Jobs Act. Child support has no tax impact for either party.
In the USA: For divorces finalised after 31 December 2018, alimony is neither deductible by the payer nor taxable to the recipient (Tax Cuts and Jobs Act). Pre-2019 divorces follow the old rules. In the UK: Maintenance payments are generally not taxable income for the recipient and not deductible for the payer. In South Africa: maintenance received is generally not taxable.
Alimony duration depends on the length of the marriage and jurisdiction. A common guideline is one year of support for every three to five years of marriage. Long-term marriages (20+ years) may result in indefinite or permanent alimony. Courts consider factors like age, health, earning capacity, and the recipient's ability to become self-supporting.
Alimony duration varies by state and marriage length. Common rules: marriages under 5 years — short-term support (1–2 years); 5–15 years — 30–50% of marriage length; 15+ years — potentially indefinite (until remarriage or significant financial change). Some states (Texas, Mississippi) rarely award long-term alimony. Rehabilitative alimony is most common today.
No — for divorces finalized after December 31, 2018 (under the Tax Cuts and Jobs Act): alimony payments are not deductible by the payer and not taxable income to the recipient. For divorces finalized before 2019, the old rules apply: deductible for payer, taxable for recipient. Pre-2019 agreements modified after 2018 may elect new rules.
Courts consider: length of marriage, each spouse's income and earning capacity, standard of living during marriage, age and health of both spouses, contributions to the marriage (including homemaking), time needed to become self-supporting, and marital misconduct (in some states). There is no standard formula — outcomes vary significantly by state and judge.
⚠️ Disclaimer Estimates only. Not financial or legal advice. Consult a qualified professional.

Sources & Methodology

Estimates are based on general legal principles. Alimony law varies significantly by state.