Massachusetts Alimony Rules

Massachusetts alimony rules changed dramatically with the Alimony Reform Act of 2011, which introduced hard durational limits and income-based caps that didn't exist before. If you're going through a divorce, these rules set the boundaries of what a judge can order — and they're more mechanical than most people expect.

The Income Cap: 30–35% of the Difference

Under M.G.L. c. 208, §§ 48–55, general term alimony should generally not exceed the recipient's need or 30% to 35% of the difference between the spouses' gross incomes. The formula looks like this:

Maximum alimony = 0.30 to 0.35 × (payor's gross income − recipient's gross income)

So if one spouse earns $150,000 and the other earns $50,000, the cap sits between $30,000 and $35,000 per year — or roughly $2,500 to $2,917 per month.

A judge can deviate from this range, but only for specific reasons like advanced age, chronic illness, or situations where the recipient genuinely cannot become self-supporting.

Durational Limits by Marriage Length

The Reform Act capped how long alimony can last based on how long the marriage lasted:

A 12-year marriage, for example, caps alimony at 70% of 144 months — roughly 8.4 years. Even alimony awarded for an indefinite period generally terminates when the payor reaches full retirement age under Social Security; a court may set or extend a different date for good cause with written findings.

How the Tax Change Affects the Real Numbers

Before 2019, the payor deducted alimony payments from their taxable income, and the recipient reported them as income. That's no longer the case. Under current federal and Massachusetts tax rules, alimony is neither deductible for the payor nor taxable for the recipient.

This shift means the actual cost to the payor is higher than it used to be, because they're paying from after-tax income. The Massachusetts Bar Association has suggested that post-2018 alimony awards should reflect this by targeting the lower end of the range — closer to 23% to 28% of the gross income difference — though this isn't codified in statute.

When Alimony Ends Automatically

General term alimony terminates by operation of law under several conditions:

• The recipient remarries
• Either party dies
• The payor reaches full Social Security retirement age; a court may set a different termination date or extend an existing order for good cause with written findings

Cohabitation is also a factor. If the recipient lives with a new partner in a "common household" for at least three months, the payor can file a complaint to reduce, suspend, or terminate alimony. The court evaluates the economic impact of the new living arrangement rather than applying an automatic cutoff.

What Gross Income Includes (and Excludes)

The definition of gross income for alimony calculations is broader than your W-2. It includes salary, bonuses, commissions, self-employment income, rental income, and certain investment returns.

However, the court excludes capital gains, dividends, and interest from assets that have already been divided in the property settlement. The logic is straightforward: if your ex already received their share of those assets, the income from your portion shouldn't inflate the alimony calculation.

Income already used to calculate child support is also excluded from the alimony base, which prevents double-counting when both obligations exist simultaneously.

Calculating Alimony When Child Support Applies

When both alimony and child support are on the table, Massachusetts courts follow the Cavanagh v. Cavanagh (2022) framework. The judge runs the numbers two ways:

1. Calculate alimony first, then figure child support from the adjusted incomes
2. Calculate child support first, then figure alimony from whatever income remains eligible

The court compares both results and picks the combination that's most equitable for the family. This prevents the old problem where a child support order consumed so much income that no alimony was possible, even when the recipient clearly needed it.

Our Massachusetts Financial Split Guide includes an alimony estimation worksheet that walks you through both calculation methods step by step.

What a Judge Actually Considers

Beyond the formula, a judge weighs these Section 34 factors:

• Length of the marriage
• Age and health of each spouse
• Income, employment, and employability
• Economic and non-economic contributions to the marriage (including homemaking)
• Lost economic opportunities — if one spouse left the workforce to raise children, the court accounts for that career gap
• The marital lifestyle the parties maintained

The formula sets the ceiling. The judge's analysis of these factors determines where within that range the actual order lands — or, in unusual cases, whether to go above it.

The Bottom Line

Massachusetts alimony follows a structured formula: 30–35% of the gross income difference, with hard time limits based on marriage length. The 2011 Reform Act replaced judicial guesswork with predictable caps, and the 2019 tax change shifted the real cost of payments. Your negotiation starts with these numbers, not with abstract arguments about fairness.

See more Massachusetts guides →