Cavanagh v Cavanagh Massachusetts

Before Cavanagh v. Cavanagh (2022), Massachusetts courts had a messy problem: how do you calculate alimony and child support when both are on the table? Judges often calculated child support first, found that the support obligation consumed most of the available income, and then denied alimony entirely — leaving the lower-earning spouse without spousal support despite a clear statutory entitlement.

The Supreme Judicial Court's Cavanagh decision established a mandatory three-step framework that prevents this outcome.

The Problem Cavanagh Fixed

The Alimony Reform Act of 2011 caps general term alimony at 30–35% of the difference between the spouses' gross incomes. The Massachusetts Child Support Guidelines use a formula based on both parents' gross incomes and parenting time.

The two formulas compete for the same pool of income. If a judge calculated child support first using full gross incomes, the resulting obligation often left insufficient "eligible income" for alimony. The lower-earning spouse got child support for the children but nothing for themselves — even after a 20-year marriage where alimony was clearly appropriate.

Cavanagh held that this approach was impermissible. A judge cannot deny alimony simply because child support was calculated first and consumed the available income. Instead, the court must run the numbers both ways and compare.

The Three-Step Framework

Step 1: Alimony First

Calculate alimony under the statutory factors, subject to the 30–35% cap on the gross income difference. Then recalculate child support using each spouse's post-alimony income (payor's income minus alimony paid; recipient's income plus alimony received).

The alimony-first approach typically produces a higher alimony award but a lower child support obligation, since the adjusted incomes are closer together.

Step 2: Child Support First

Calculate child support using both spouses' full gross incomes under the Child Support Guidelines. Then calculate alimony using whatever eligible income remains after excluding the income already counted for child support.

The child-support-first approach typically produces a higher child support obligation but a lower (or zero) alimony award.

Step 3: Compare and Choose

The judge compares the after-tax results of both scenarios — total dollars flowing to each household, including both alimony and child support — and selects the calculation method that produces the most equitable outcome for the family.

This comparison must account for the fact that alimony is no longer tax-deductible for the payor (or taxable for the recipient) under post-2018 federal tax law. The two scenarios can still produce meaningfully different results when the court compares their after-tax household outcomes.

What Counts as Income After Cavanagh

The Cavanagh decision also expanded what counts as gross income for child support calculations. The court held that employer-matching retirement contributions (401(k) match, pension contributions) and Health Savings Account (HSA) contributions represent economic benefits that should be included in the gross income calculation.

This matters because many higher-earning spouses receive significant employer matches. A $150,000 salary with a 6% employer 401(k) match includes an additional $9,000 in economic benefit. After Cavanagh, that $9,000 is part of the gross income used to calculate child support.

The practical effect: if you or your spouse has a generous employer retirement plan, the child support calculation will be higher than the statutory guidelines would suggest based on W-2 income alone.

How This Affects Settlement Negotiations

If you're negotiating a separation agreement rather than going to trial, Cavanagh provides a useful framework:

For the higher-earning spouse: Running both calculations gives you a realistic range. If alimony-first produces $2,800/month in combined payments and child support-first produces $2,400/month, your total exposure falls somewhere in that range. Offering a number in the middle — with clear math showing how you arrived at it — is stronger than a number pulled from intuition.

For the lower-earning spouse: Cavanagh protects you from the old problem of having alimony eliminated by a child support calculation. If your attorney or mediator tries to calculate child support first and then claims no income is left for alimony, that approach doesn't comply with current law.

For both parties: The three-step framework adds complexity but also predictability. You can run the numbers before the hearing and arrive at a narrow range of probable outcomes. That's more useful for settlement than arguing about abstract fairness.

Running the Numbers Yourself

You'll need:

• Both spouses' gross annual income (including bonuses, commissions, and investment income)
• Employer retirement matching contributions and HSA contributions
• The Massachusetts Child Support Guidelines worksheet
• The alimony formula: 30–35% × (payor's gross income − recipient's gross income)

Run both scenarios on paper. Calculate the combined monthly flow to each household under each method. Consider the after-tax impact — remember that alimony doesn't change either party's tax liability (no deduction for payor, no income for recipient), while child support has no tax consequences for either party.

Our Massachusetts Financial Split Guide walks through the Cavanagh three-step calculation with a structured worksheet, including the employer benefit adjustments that most online calculators miss.

The Bottom Line

Cavanagh prevents courts from zeroing out alimony by calculating child support first. The mandatory three-step framework — alimony-first, child support-first, then compare — ensures both obligations are evaluated on their own terms before the court decides the most equitable combination. If your divorce involves both children and a significant income gap, this ruling directly shapes your financial outcome.

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