Skip to content
Allin
Sign up · Sign in

Alimony / Spousal Support Calculator

Runs three published US guideline formulas side by side — the AAML 2007 guideline, the New York statutory maintenance formula and the Massachusetts Alimony Reform Act — so the spread between them is visible. Models the duration limits and the 2017 Tax Cuts and Jobs Act split: agreements executed after 31 December 2018 are no longer deductible to the payer nor taxable to the recipient.

Related tools

All Savings & budgeting tools →
Child Support Calculator (Income Shares Model)Applies the income-shares model — the framework used by most US states — using the published Michigan Child Support Formula 2025 schedule. Shows the combined obligation, each parent's share of it, the parenting-time offset and the child-care, health-premium and extraordinary-medical add-ons, line by line.529 College Savings CalculatorProject a 529 balance to college and compare it with the inflated cost, with the monthly needed to fully fund.Acid-Test (Quick) Ratio CalculatorAdd cash, securities and receivables, divide by current liabilities, and see exactly what excluding inventory and prepaid expenses costs the ratio.CD Ladder CalculatorSplit a total across staggered-maturity CDs at their own APYs, with each rung's value and the blended APY.Certificate of Deposit (CD) CalculatorSee what a CD really pays: APR vs APY made explicit, after-tax return from your marginal rate, and the cost of an early-withdrawal penalty in months of interest.College Cost CalculatorProjects tuition, housing and food, and books and other costs forward year by year at a cost-inflation rate you set, from the year the student starts through to graduation. Shows the year-by-year table, the first-year and final-year costs and the total, in your currency.Cost of Raising a Child CalculatorBuilds on the USDA Expenditures on Children by Families tables (2015 data, the last edition published), restated in today's money and projected forward at your inflation rate. Applies the economies of scale the source measured — an only child costs 27% more, a third child 24% less — and optionally adds four years of college.Equity Ratio CalculatorEquity divided by total assets, with the complementary debt ratio, the equity multiplier and a clear reading when equity is negative.

Alimony / Spousal Support Calculator is free to use as often as you like, directly from this page. It sits under Savings & budgeting in our catalogue, alongside Child Support Calculator (Income Shares Model) and 529 College Savings Calculator.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Alimony / Spousal Support Calculator?

Runs three published US guideline formulas side by side — the AAML 2007 guideline, the New York statutory maintenance formula and the Massachusetts Alimony Reform Act — so the spread between them is visible. Models the duration limits and the 2017 Tax Cuts and Jobs Act split: agreements executed after 31 December 2018 are no longer deductible to the payer nor taxable to the recipient.

When would I actually use this?

Planning a deposit, a safety net or a large purchase: how much to put aside each month, and how long a target takes at a given rate.

What is the most common mistake?

Reading a nominal rate as if it were real. Inflation is subtracted from the return, not from the capital, so a 3% account during 4% inflation loses purchasing power every year.

How is Alimony / Spousal Support Calculator different from Child Support Calculator (Income Shares Model)?

They sit next to each other but answer different questions: Child Support Calculator (Income Shares Model) is the one to open when you need it to applies the income-shares model — the framework used by most US states — using the published Michigan Child Support Formula 2025 schedule. Shows the combined obligation, each parent's share of it, the parenting-time offset and the child-care, health-premium and extraordinary-medical add-ons, line by line. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

529 College Savings Calculator is the closest one after this: Project a 529 balance to college and compare it with the inflated cost, with the monthly needed to fully fund.

What else is worth having open alongside it?

Acid-Test (Quick) Ratio Calculator and CD Ladder Calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

Compound interest is arithmetic, so the maths is exact for the rate you enter. Real accounts vary in compounding frequency, tax treatment and whether interest is credited before or after a deposit.

Further reading

All guides →
ExplainerThe Alimony Formulas Agree on the Amount and Not on the DurationTwo of the three published US alimony guidelines are the same formula written twice: on 150,000 and 30,000 dollars of gross income both give 3,250 a month. What separates them is duration — 2.1 years or 10.5 — and that turns one marriage into 81,900 or 409,500.ExplainerChild Support Is a Shared Cost, Not a Slice of One SalaryIncome shares asks what two parents together would have spent, then splits it. On $5,000 and $3,000 with two children the schedule says $2,257.37, the shares are 62.5 and 37.5 percent, and after 90 overnights the order is $1,301.47 a month.ExplainerWhat a Child Costs Is a Marginal Cost, Not a BillThe USDA's figure of 233,610 dollars for a middle-income child born in 2015 — 317,315 restated in 2025 money — is not a sum of receipts. It is allocated household spending, and the housing line is measured as the cost of one more bedroom.ExplainerThree Different Rules Get Called "The 529 Rule"Qualified expenses, the K-12 cap and state tax treatment are three separate rules, and only the first two are federal. The K-12 cap doubled to 20,000 dollars for tax years from 2026; a federally qualified withdrawal can still be a state recapture event.GuideWhat a Deposit Ladder Actually Costs: $141.92 Over Five YearsSplit $50,000 into five rungs instead of one five-year deposit and you end year five with $61,573.20 instead of $61,715.12. The whole liquidity option costs $141.92, once, during the ramp — and it is worth $1,049.24 if rates rise a point.ExplainerCollege Costs Compound for Eighteen Years Before Anyone EnrolsA four-year public in-state budget is 30,990 dollars today. Eighteen years out at 4 percent cost inflation the same four years cost 266,593 — 2.15 times the sticker you can see now. And the sticker was never the price: the average net cost of attendance is 21,340.