How to Calculate Alimony in Massachusetts: Formula, Duration, and Taxes

To calculate alimony in Massachusetts, start with general term alimony’s core rule: the award generally cannot exceed the recipient’s demonstrated financial need or 30 to 35 percent of the difference between the two spouses’ gross incomes at the time the order issues, whichever is lower.¹ How long payments last is tied to the length of the marriage. Both numbers sit inside the Massachusetts Alimony Reform Act, codified at MGL Chapter 208, Sections 48 through 55, and a judge can adjust them based on health, age, earning ability, and other statutory factors.

The Formula in Practice

The math for general term alimony is straightforward. Take each spouse’s gross income, subtract the lower from the higher, and multiply the difference by a figure between 30 and 35 percent. That result is the maximum annual alimony, capped again by whatever the recipient can actually show as need.²

A worked example. The higher earner grosses $150,000; the lower earner grosses $50,000. The gap is $100,000. Thirty percent of that is $30,000 a year; 35 percent is $35,000. If the recipient’s need is at least that high, the annual award will likely land somewhere in the $30,000–$35,000 range. Where inside that band a judge lands depends on the specific circumstances of the case.

One boundary worth naming up front: the 30–35 percent formula applies only to general term alimony. Reimbursement alimony is not subject to the income-percentage guidelines at all, and the other two Massachusetts categories, rehabilitative and transitional, have their own duration rules.¹

What Counts as Income

Massachusetts borrows its definition of income from the child support guidelines, so most earned and unearned income goes into the calculation. Wages, salary, bonuses, commissions, and self-employment income all count.¹

Two categories come out:

Investment income (capital gains, dividends, interest) generated by assets that were already divided equitably in the divorce.
Gross income the judge has already used to set a child support order. The same dollars cannot be counted twice.²

There is also a rule that surprises people. If a judge finds that a spouse is voluntarily unemployed or underemployed, the court can attribute income based on what that spouse could reasonably earn, not what they actually bring home. The formula then runs against the attributed number.¹

How Long Payments Last

The length of your marriage sets a ceiling on how long general term alimony can run. For marriages of 20 years or less, Section 49 caps duration as a percentage of the total months you were married:³

5 years or less: no more than 50 percent of the months married.
More than 5, up to 10 years: no more than 60 percent.
More than 10, up to 15 years: no more than 70 percent.
More than 15, up to 20 years: no more than 80 percent.

Applied to a 12-year marriage: 70 percent of 144 months is roughly 100 months, or about 8 years and 4 months of maximum alimony.

Marriages longer than 20 years are the exception. A judge can order alimony for an indefinite period, but “indefinite” is not “forever.” The order still terminates when the payor reaches full retirement age unless the court finds good cause to extend.³

Factors That Move the Number

The formula and the duration table give you a range. Where a judge lands inside that range, and whether the judge deviates from it, depends on the Section 53 factors:²

Length of the marriage.
Age and health of both spouses.
Income, employment, and employability, including whether a spouse could reasonably find work with additional training.
Economic and non-economic contributions during the marriage, including homemaking.
The marital lifestyle and each spouse’s ability to maintain it after the divorce.
Lost economic opportunity resulting from the marriage.
Any other factor the court finds relevant.

Section 34, which governs property division, adds overlapping considerations: vocational skills, each spouse’s liabilities, future earning potential, and contributions to acquiring or preserving marital assets.⁴ Judges read Sections 34 and 53 together, so the way property is split often influences the alimony award, and the alimony award often influences the property split.

When a Judge Can Deviate

The percentages and duration caps are guidelines. A judge can order more or less, or extend beyond the duration cap, by putting written findings on the record. Statutory grounds include:¹

Advanced age, chronic illness, or unusual health circumstances of either spouse.
Tax consequences of the alimony structure to each party.
Whether the payor is providing health insurance or maintaining life insurance for the recipient’s benefit, and the cost of doing so.
Income from assets that were not divided in the divorce.
Significant premarital cohabitation as economic partners, which the judge can effectively fold into the length of the relationship.
A spouse’s inability to become self-supporting because of physical or mental abuse by the payor.
Inability to support oneself due to lack of property, employment opportunities, or other resources.

A catch-all lets the court weigh any other factor it considers relevant, so long as the reasoning is written into the order.

Which Type of Alimony Applies

Before running the formula, confirm that general term alimony is actually the right category. Massachusetts recognizes four forms, and only one is governed by the 30–35 percent calculation.

General term alimony is periodic support to an economically dependent spouse, and it’s the type the formula and duration tiers describe.⁵

Rehabilitative alimony supports a spouse expected to become self-sufficient within a defined period, such as after finishing school or job training. It is capped at five years and can be extended only if unforeseen events prevented self-sufficiency, the recipient genuinely tried, and the payor can still afford it.⁶

Reimbursement alimony is available only for marriages of five years or less. It compensates a spouse who made significant contributions to the other’s earning capacity, such as working while the other completed a professional degree. The court sets a fixed total and payment schedule, and the income-percentage guidelines do not apply.¹

Transitional alimony, also limited to marriages of five years or less, helps the recipient adjust to a new lifestyle or living situation and cannot last more than three years from the date of divorce. Unlike the other forms, it cannot be modified, extended, or converted.⁷

When Child Support Is Also in Play

If children are involved, the alimony number and the child support number are calculated together, because the same dollars can’t feed both orders. In Cavanagh v. Cavanagh (2022), the Massachusetts Supreme Judicial Court laid out a three-step framework judges now follow.

First, the court calculates alimony under the standard formula, then runs child support on each parent’s post-alimony income. Second, it flips the order: child support first, alimony on what remains. Third, the judge compares both scenarios and chooses the combination most equitable for the family, including the children. If the judge decides against any alimony award, the decision has to explain why.

The practical result is interdependence. A higher alimony award shrinks the income available for child support, and a higher child support order shrinks what’s available for alimony. If you’re expecting both, the final numbers will not match what either formula produces on its own.

Tax Treatment Changes the Real Number

Federal tax rules affect what the alimony figure actually costs and delivers. For any divorce or separation agreement finalized after December 31, 2018, alimony is not deductible by the payor and not taxable to the recipient.⁸ The Tax Cuts and Jobs Act eliminated the older treatment.

Pre-2019 agreements still follow the old rule (payor deducts, recipient reports as income) unless they’ve been modified in a way that expressly adopts the repeal.⁸ Under current rules every dollar of alimony costs the payor a full dollar and the recipient keeps every dollar, which often pushes negotiations toward different numbers than the raw formula would suggest.

1
General Court of Massachusetts. Massachusetts General Laws Chapter 208 Section 53 – Determination of Form, Amount and Duration of Alimony
2
Mass.gov. How the Court Decides on Alimony
3
General Court of Massachusetts. Massachusetts General Laws Chapter 208 Section 49 – Termination, Suspension or Modification of General Term Alimony
4
General Court of Massachusetts. Massachusetts General Laws Chapter 208 Section 34 – Alimony or Assignment of Estate
5
General Court of Massachusetts. Massachusetts General Laws Chapter 208 Section 48 – Definitions
6
General Court of Massachusetts. Massachusetts General Laws Chapter 208 Section 50 – Termination, Extension or Modification of Rehabilitative Alimony
7
General Court of Massachusetts. Massachusetts General Laws Chapter 208 Section 52 – Termination of Transitional Alimony
8
Internal Revenue Service. Topic No. 452, Alimony and Separate Maintenance