Massachusetts courts must now calculate alimony and child support in two separate steps under Cavanagh v. Cavanagh, eliminating the de facto 50% income cap practitioners assumed since 2012. In high-income divorces, combined support obligations can lawfully reach 55-60% of gross income, with the 2025 Appeals Court decision in Smith v. Smith applying the three-step framework.
Key Facts
| Item | Detail |
|---|---|
| What happened | June 2026 analysis confirms Cavanagh v. Cavanagh mandates dual alimony-then-child-support calculations, ending the assumed 50% income cap |
| When | Cavanagh decided 2022; 2025 Appeals Court decision Smith v. Smith applied it; renewed analysis published June 2026 |
| Where | Massachusetts (statewide, all Probate and Family Court divisions) |
| Who's affected | High-income divorcing couples, especially where one spouse earns $250,000+ and children are involved |
| Key statute/rule | Mass. Gen. Laws ch. 208 § 53 (Alimony Reform Act) and the Massachusetts Child Support Guidelines |
| Impact | Combined support can now lawfully reach 55-60% of gross income in high-earner cases |
Why this matters legally
This framework changes how Massachusetts courts calculate support in cases involving both alimony and children. Before Cavanagh, many practitioners read Mass. Gen. Laws ch. 208 § 53(c)(2) as effectively capping total support near 30-35% of the difference in incomes, treating alimony and child support as an either-or proposition rather than a combined obligation.
The Supreme Judicial Court rejected that shortcut in Cavanagh v. Cavanagh, 490 Mass. 398 (2022), as reported by Massachusetts Lawyers Weekly. The Court held that judges must perform a structured three-step analysis: first calculate alimony, then calculate child support, then compare the results against an alternate ordering to determine which produces the most equitable outcome. Because each calculation draws on a different statutory formula, the combined total is no longer artificially constrained by a single 50% ceiling. The 2025 Appeals Court decision Smith v. Smith confirmed that trial judges who skip this dual calculation commit reversible error.
How Massachusetts law handles this
Massachusetts law treats alimony and child support as distinct obligations governed by separate authorities. Alimony flows from the Alimony Reform Act of 2011, codified at Mass. Gen. Laws ch. 208 §§ 48-55. Under § 53(b), general term alimony "should generally not exceed the recipient's need or 30 to 35 per cent of the difference between the parties' gross incomes." Child support, by contrast, is set by the Massachusetts Child Support Guidelines, which apply a separate formula to combined gross income up to $400,000 per year.
The key tension Cavanagh resolved sits in § 53(c)(2), which states that when a court sets both alimony and child support, the combined order should reflect each statutory scheme. Judges had read this as a cap. The Supreme Judicial Court clarified it is instead a coordination rule. Under the Cavanagh three-step method, the court (1) calculates alimony first then child support on the post-alimony income, (2) calculates child support first then alimony, and (3) selects the approach yielding the most equitable result while making written findings. Because alimony reduces the payor's income before the second calculation in one ordering, the two formulas stack rather than offset, allowing combined obligations of 55-60% of gross income in high-earner cases where the recipient demonstrates genuine need.
This matters most above the $400,000 combined-income threshold, where judges exercise discretion beyond the Guidelines grid. In a divorce where one spouse earns $600,000 and the other earns $40,000, the dual calculation can produce combined support that consumes well over half the payor's gross income, a result that was widely assumed impossible before 2022.
Practical takeaways
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Run both calculation orderings before settlement. Massachusetts judges must compare alimony-first and child-support-first results under Cavanagh, so any settlement projection that uses only one ordering understates potential exposure. Ask your attorney to model both sequences.
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Document the recipient's actual need. The 55-60% outcomes appear where the lower-earning spouse shows genuine need under Mass. Gen. Laws ch. 208 § 53(b). Detailed financial statements (Probate and Family Court Form CJ-D 301) strengthen or limit a support claim depending on which side you represent.
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Reassess income above $400,000. The Child Support Guidelines presumptively cap their formula at $400,000 of combined income. Above that line, judges apply discretion, and the Cavanagh stacking effect is most pronounced. High earners should expect individualized analysis, not a mechanical percentage.
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Revisit older agreements during modification. Separation agreements drafted before 2022 may rest on the now-rejected 50% assumption. If you are seeking or facing a modification under Mass. Gen. Laws ch. 208 § 37, the Cavanagh framework, not the old cap, governs the recalculation.
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Prioritize tax-aware structuring. Because alimony is no longer federally deductible for agreements executed after December 31, 2018, the order in which support stacks affects after-tax cash flow. A family law attorney working with a tax advisor can model the net impact before you sign.
If you are divorcing in Massachusetts with significant income or children, the Cavanagh framework can materially change what you pay or receive, and the difference between the two calculation orderings can amount to tens of thousands of dollars per year. A Massachusetts family law attorney can model both scenarios against your actual numbers before you commit to a settlement.
This article discusses recent news and provides general legal commentary. It does not constitute legal advice. Every case is unique. Consult a qualified family law attorney for advice specific to your situation.