When a Massachusetts case involves both alimony and child support, a judge cannot simply pick one and calculate it first. In Cavanagh v. Cavanagh, 490 Mass. 398 (2022), the Supreme Judicial Court required judges to run the calculation both ways, alimony first and then child support, then child support first and then alimony, compare the two results including their tax consequences, and adopt whichever is more equitable. The framework is now written into the Child Support Guidelines themselves.
Alimony and child support are governed by different statutes, serve different people, and are calculated in completely different ways. Alimony under G.L. c. 208, section 53 turns on the recipient spouse's need measured against the marital lifestyle. Child support runs off a worksheet driven almost entirely by the parties' incomes.
The complication is that the two are not independent. Alimony moves income from one party to the other, and the child support worksheet is fed by exactly those income figures. Change the alimony number and you change the incomes that go into the child support calculation. Run the child support calculation first and you change the income picture against which alimony need is assessed.
So the order in which a judge performs the two calculations can produce two different sets of numbers from the same underlying facts. For years there was no clear instruction about which order to use. In 2022 the Supreme Judicial Court supplied one, and the answer was not to pick an order but to do both.
What Is the Three-Step Framework?
The framework originates in the Supreme Judicial Court's 2022 decision in Cavanagh v. Cavanagh, 490 Mass. 398. Where a judge is considering both alimony and child support, the court must work through three steps.
The Three Steps
Step one. Calculate alimony first, then child support. Determine the alimony award under the section 53 factors, then run the child support calculation using each party's income as adjusted by that alimony order.
Step two. Calculate child support first, then alimony. Reverse the sequence. Determine child support under the Guidelines, then assess alimony in light of that order.
Step three. Compare the two, and choose. Set the two outcomes side by side, including their respective tax consequences, and adopt the order that is more equitable for the family. The judge is expected to explain the comparison rather than simply announce a result.
A point of citation that causes real confusion is worth settling here, because two different decisions share the name. The three-step framework comes from the 2022 Supreme Judicial Court decision, 490 Mass. 398. A later 2025 Appeals Court decision, 105 Mass. App. Ct. 620, is also called Cavanagh and is also correctly citable, but it did not create the framework. It applied the framework on remand, and says as much. Both belong in a proper citation; the origin is the 2022 case.
Why Does the Order of Calculation Change the Result?
The mechanism is simpler than it sounds. Alimony is a transfer. Paying it reduces the payor's available income and increases the recipient's. The child support Guidelines calculate an order from the two parties' incomes and the gap between them, so if alimony has already been ordered, the worksheet receives a narrower income gap than it would otherwise have seen.
Running the sequence the other way starts from the undisturbed incomes, produces a child support figure built on the full gap, and only then turns to whether the recipient still has a demonstrated need for alimony and what is left with which to pay it.
Neither sequence is inherently more generous to either party, and that is the reason the comparison is required rather than a fixed order being prescribed. Which sequence produces the better total outcome depends on the income levels, the number of children, and the size of the gap between the parties. The Supreme Judicial Court did observe that calculating child support first will, in the great majority of cases, leave no room for alimony at all. That is an observation about how step two tends to come out, not permission to skip it.
If you want to see how sensitive each half is to the inputs, our Massachusetts Alimony Calculator and Child Support Calculator can be run separately with different income assumptions. Neither performs the Cavanagh sequencing, and neither models tax, so they show the components rather than the comparison.
When Does a Court Have to Run Both Sequences?
Whenever both forms of support are genuinely at issue. There is no income threshold that switches the requirement on.
This is worth stating plainly because incorrect information circulates on this point. Some published material asserts that the two-sequence comparison applies only above a combined income of $450,000. No such threshold exists. The Supreme Judicial Court framed the duty as arising in cases where child support is contemplated, the 2025 Appeals Court decision described it as applying where child support payments are likely to be ordered, and Child Support Guidelines section II.A.3 sets out the three steps with no income qualifier of any kind.
The $450,000 figure is real, but it is a different rule doing a different job. It is the combined income ceiling of the child support formula, above which support on the excess becomes discretionary rather than formulaic. It has nothing to do with whether a judge must compare the two sequences. Confusing the two produces the wrong answer in exactly the middle-income cases where the comparison is most likely to matter.
Why Can't Child Support Be Used to Zero Out Alimony Need?
Cavanagh holds that a court may not use a child support order to eliminate or artificially suppress a recipient spouse's demonstrated need for alimony.
The reasoning follows from what the two payments are for. Child support exists to meet the needs of the children. Alimony exists to address a spouse's own need to maintain something approaching the marital lifestyle. Money that arrives labelled as child support is directed at the first purpose, and treating it as though it also answers the second would quietly deprive the recipient of support the statute contemplates while leaving the children's provision to do double duty.
In practice this closes off an argument that used to be attempted: run child support first, point to the household income the recipient now has, and contend that need has been satisfied. The two analyses have to stay distinct even though the calculations feed each other.
What About Tax Consequences?
Step three requires the judge to compare the tax outcomes of the two sequences, not only the pre-tax figures. That instruction is a real part of the framework and it is not optional.
What it means in practice, however, has changed substantially since the framework was announced, and this is the part most likely to mislead someone reading older material.
For a Divorce Happening Today, the Tax Layer Is Usually Inert
Alimony. For any instrument executed after December 31, 2018, alimony is neither deductible by the payor nor included in the recipient's taxable income for federal purposes. Massachusetts follows the same treatment, because Massachusetts gross income is defined by reference to the federal Internal Revenue Code and alimony is not one of the items added back by state law.
Child support. Child support has never been deductible by the payor or taxable to the recipient, at either the federal or the Massachusetts level.
The consequence. If both forms of support are tax-neutral on both sides, the tax comparison in step three generally does not move the numbers apart. It has real work to do for instruments executed before 2019, and for pre-2019 instruments that were modified with an express election of the current federal treatment.
This matters for expectations. Competing calculators and articles promoting a tax comparison feature are describing something that was genuinely significant for divorces finalised before 2019 and is largely inert for a couple divorcing now. Anyone told that a clever allocation between alimony and child support will produce a tax advantage on a new order should ask which instrument, and which year, that advantage is supposed to come from.
One further point about how step three actually operates. It is a rule about who must put evidence before the court, rather than a formula the judge applies unaided. If a party believes tax treatment affects the comparison in their case, it is their job to put that evidence in the record. A judge is not expected to construct a tax analysis out of nothing, and a simplified estimate that ignores filing status and the allocation of dependency benefits is not a substitute for one.
How This Connects to the 30 to 35 Percent Ceiling
Cavanagh also reaffirms how the familiar percentage band in G.L. c. 208, section 53(b) is supposed to function. The band is a ceiling, not a presumptively correct award.
The 2025 Appeals Court decision made the point sharply: setting alimony directly at a percentage of the difference between the parties' incomes, without first determining the recipient's actual need, is error. The correct sequence is need first, then capped by the lower of that need or the percentage band, and not the reverse.
That is why our alimony calculator reports its output as a statutory ceiling rather than as a predicted award. The related question of what may count toward need in the first place is addressed in our article on savings, marital lifestyle and alimony after Openshaw.
Is This Reflected in the Child Support Guidelines?
Yes, and that is the development that turns this from a case a lawyer needs to know about into a rule built into the machinery.
Child Support Guidelines section II.A.3 was amended to reflect the 2022 decision, so the three-step framework now sits inside the Guidelines rather than alongside them as separate case law. A judge working through the Guidelines encounters the requirement in the ordinary course. For anyone reading an older article or working from a pre-2022 form, that is the single most important thing to update.
Cavanagh v. Cavanagh, 490 Mass. 398 (2022); Cavanagh v. Cavanagh, 105 Mass. App. Ct. 620 (2025); G.L. c. 208, section 53; Child Support Guidelines section II.A.3. Verified as of August 17, 2026.
What This Means If Both Are at Issue in Your Case
If your case involves children and a realistic alimony claim, three practical points follow.
- A single calculation is not the answer. If the other side presents one set of numbers produced in one order, that is half of what the framework requires. The comparison is the point.
- The income figures feeding each sequence have to be right. Both calculations run off income, so a dispute about what counts as income affects both halves at once. Where investment assets are being divided, the question of whether their income can be counted at all is a separate rule with its own answer, covered in our article on double dipping and investment income.
- Be sceptical of a tax argument on a new order. For instruments executed from 2019 onward, both forms of support are tax-neutral on both sides, so a claimed tax advantage needs a specific explanation.
Getting this right is detailed work, and the difference between the two sequences can be substantial over the life of an order. If alimony and child support are both in play in your case, contact us for a confidential consultation. We represent clients across Essex and Middlesex Counties and the North Shore from our office in Topsfield, with appointments available in Gloucester and North Andover.