Alimony Amount Calculator

The formula

There is no federal alimony formula

Unlike child support, no US state is required to use a numeric alimony guideline, and most judges retain wide discretion. That said, formula-driven states anchor practice: Massachusetts' Alimony Reform Act (2011) sets general-term alimony at the recipient's need or 30–35% of the income difference, whichever is less; several states' bar associations (AAML chapters in Pennsylvania, Kansas, Illinois before 2019) popularised the "30/20 rule" — 30–40% of the payor's gross minus 20–30% of the recipient's. This calculator computes both and takes the lower, then applies the near-universal safeguard that the recipient's total income should not exceed a set share (commonly 40%) of the couple's combined gross. Where child support is also payable, most formulas deduct it from the payor's income before computing alimony.

See also: Rehabilitative Alimony Calculator

Duration matters as much as amount

The Massachusetts bands are the most-copied duration framework: general-term alimony runs up to 50% of the marriage length for 0–5 years, 60% for 5–10, 70% for 10–15 and 80% for 15–20; beyond 20 years the court may order indefinite support. A 12-year marriage therefore caps at about 101 months even if the payor could afford more. All general-term orders terminate on the recipient's remarriage, and in Massachusetts on cohabitation of three months or more or the payor reaching full retirement age — sometimes earlier than the formula predicts. Rehabilitation alimony (job retraining, typically up to 5 years) and reimbursement alimony (short marriages where one spouse funded the other's degree) follow separate rules.

Taxes and the 2019 cliff

For divorce instruments executed after December 31, 2018, alimony is tax-neutral: the payor gets no deduction and the recipient declares no income — a reversal of 75 years of US tax law that shifted real money (the old deduction was worth the payor's marginal rate, often making orders 15–30% larger for the same after-tax cost). Instruments from 2018 or earlier keep the old treatment unless both parties amend. The UK has no equivalent deduction and maintenance between ex-spouses is generally tax-free to the recipient. Because post-2019 alimony is paid in after-tax dollars, gross-income formulas systematically overstate what a payor can actually afford — courts increasingly sanity-check guideline numbers against after-tax budgets.

Frequently asked questions

Source & methodology

Massachusetts General Laws ch. 208 §§ 48–55 (Alimony Reform Act of 2011: 30–35% of income difference, duration bands, 40%-of-combined cap practice); American Academy of Matrimonial Lawyers guideline formulations; Tax Cuts and Jobs Act § 11051 (post-2018 alimony tax treatment).

How Alimony Amount works — and what your result really means

You are here because you need a specific number, and you want to see how it was produced before you rely on it. There are plenty of pages about Alimony Amount; almost none of them show the working. This one does: the formula, every input, a fully computed example, and a sensitivity analysis calculated live from this engine’s own defaults.

The number itself is the easy part. What takes judgement is knowing which inputs are facts in your situation and which are guesses wearing a decimal point — a distinction this page makes explicit for every field above.

There is a habit that separates people who get useful answers from Family Law numbers: they decide what question the figure answers before they compute it. Alimony Amount answers “Estimated alimony?” — and nothing else, which is precisely why the result is trustworthy.

Nothing below is stock text pasted around a number: the worked example computes estimated alimony = $1,750.00 $/month from this tool’s own defaults, and the sensitivity section ranks the inputs that move the result — Recipient cap: total income ≤ this % of combined first, at ≈31.4 % of the headline for a ten-percent error either way in that input. Read the sections in order and you will be able to reproduce every figure by hand.

Every input in Alimony Amount, and what it does to the answer

The engine implements a single stated model: alimony = min( payor% × payor income − payee% × payee income, diff% × (income difference), cap% × combined − payee income ); duration = marriage years × ARA factor (50/60/70/80% by band; over 20 years is long-term). There is no hidden coefficient and no login-gated precision — the formula printed is the formula executed, which is also what makes the result citable.

Payor's gross annual income (example value $120,000.00) is a currency figure — enter the total exactly as your document states it, fees included. Use the figure exactly as the source document states it, not a rounded memory of it — an omitted line is the classic silent error.

Recipient's gross annual income (example value $45,000.00) is a money value, and money values are where rounding habits do the most damage — type the real figure, not a tidied one. If your source quotes a figure before and after some deduction, decide which one the formula wants and be consistent for every field.

Length of marriage (years) (example value 12) is a measured number in the unit named by the label; the formula does not convert for you. Small measurement errors grow here: a length that is squared or cubed in the model magnifies a one-percent slip into a three-percent answer.

Payor income factor (%) (example value 30) is a measured number in the unit named by the label; the formula does not convert for you. Enter it exactly as your document states it — quoted annual, monthly and effective rates are three different numbers.

Recipient income factor (%) (example value 20) is a measured number in the unit named by the label; the formula does not convert for you. Enter it exactly as your document states it — quoted annual, monthly and effective rates are three different numbers.

Difference-of-incomes factor (%) (example value 33) is a quantity rather than a category — precision here is cheap and worth having. Enter it exactly as your document states it — quoted annual, monthly and effective rates are three different numbers.

Recipient cap: total income ≤ this % of combined (%) (example value 40) is a plain measured quantity — the unit shown in the label is the unit the formula expects. Check the convention first: if the source says “6.5 % per year”, type 6.5 and let the formula do the rest.

See also: Reimbursement Alimony Calculator

Alimony Amount on the example inputs: the complete substitution

Rather than describe the calculation, here it is end to end — every substitution in order, starting from the inputs above. Starting figures: Payor's gross annual income, Recipient's gross annual income, Length of marriage (years), Payor income factor (%). Run to the end, the estimated alimony resolves to $1,750.00 $/month — $21,000 per year · guideline $2,031.25/mo (capped) · duration 101 months on the bands this tool uses.

1. 30/20 rule: 30% × $120,000 − 20% × $45,000 = $36,000 − $9,000 = $27,000/year.
2. Difference rule: 32.5% × ($120,000 − $45,000) = $24,375/year. Guideline takes the lower: $24,375.
3. Cap test: recipient + alimony ≤ 40% × $165,000 = $66,000 → alimony ≤ $66,000 − $45,000 = $21,000. Final: $21,000/year = $1,750.00/month.
4. Duration: 12-year marriage → factor 70% → 101 months, total $176,400.

30/20 rule result — $2,250.00 $/month. Read next to the headline, this is the figure that shows the shape of the trade-off.

Difference-of-incomes result — $2,031.25 $/month. Read next to the headline, this is the figure that shows the shape of the trade-off.

Cap (recipient at 40% of combined) — $1,750.00 $/month. If your inputs change, this is usually the first companion figure to move.

Duration factor — 70. Compare it against the main result of $1,750.00 $/month before drawing conclusions.

Support duration — 101. If your inputs change, this is usually the first companion figure to move.

Overwrite any input above and every line of this example updates with it — the substitution is live, not a screenshot of somebody else’s numbers.

How far Alimony Amount can reasonably move

The honest version of any estimate is a corridor, and this one is cheap to produce: Alimony Amount was recomputed at 5 points along the dominant input, with every other field left untouched.

The corridor runs from $650.00 $/month to $2,031.25 $/month across that band — which is the range worth planning inside rather than the single $1,750.00 $/month point estimate. Reproduce it in the form above by editing Recipient cap: total income ≤ this % of combined alone; the substitution steps will follow your figures exactly.

What actually moves your Alimony Amount

Nobody should have to guess which input matters. The engine was re-run once per field below — ten percent up, ten percent down, everything else frozen — and the results ranked by how far they moved the estimated alimony. For Alimony Amount the ranking is measured rather than guessed, and it belongs to these defaults: shift the starting point and the order can shift with it.

• Recipient cap: total income ≤ this % of combined +10 % → Alimony Amount = $2,031.25 $/month · −10 % → $1,200.00 $/month (the estimated alimony shifts ≈31.4 %)
• Payor's gross annual income: ten percent up gives $2,150.00 $/month, ten percent down gives $1,350.00 $/month — ≈22.9 % of the estimated alimony either way
• Recipient's gross annual income +10 % → Alimony Amount = $1,525.00 $/month · −10 % → $1,975.00 $/month (the estimated alimony shifts ≈12.9 %)

Recipient cap: total income ≤ this % of combined is the dominant lever here: ten percent either way moves the result by about 31.4 %, from $1,200.00 $/month to $2,031.25 $/month. That is where a careless figure does the most damage, so check it against a source, and treat Payor's gross annual income as the second priority (≈22.9 % per ten percent). The remaining fields can sit at safe defaults without materially changing the answer — knowing which is which is what separates a careful calculation from an anxious one.

Is your Alimony Amount good — reading the result bands

Nobody acts on a bare figure — they act on a figure with a comparison attached. The verdict attached to the default calculation — “$21,000 per year · guideline $2,031.25/mo (capped) · duration 101 months” — is one band on a ladder your own figure may sit somewhere else on. How much of that band is luck? On Recipient cap: total income ≤ this % of combined alone ten percent either way covers $1,200.00 $/month to $2,031.25 $/month. The practical reading rules: compare against your own history before comparing against other people; treat band boundaries as zones, not walls — one point on the wrong side of a threshold rarely changes a real outcome; and when a companion output contradicts the headline, believe the pair.

Where Alimony Amount sits next to similar measures: this tool answers “how much is the Alimony Amount”, while the related calculators answer “what do I do about it”. Reading the result alone tends to over-weight a single snapshot; pairing it with the companion tools above turns the number into a decision.

See also: Transitional Alimony Calculator

The errors that quietly break an Alimony Amount figure

For divorce instruments executed after December 31, 2018, alimony is tax-neutral: the payor gets no deduction and the recipient declares no income — a reversal of 75 years of US tax law that shifted real money (the old deduction was worth the payor's marginal rate, often making orders 15–30% larger for the same after-tax cost). Instruments from 2018 or earlier keep the old treatment unless both parties amend. The UK has no equivalent deduction and maintenance between ex-spouses is generally tax-free to the recipient. Because post-2019 alimony is paid in after-tax dollars, gross-income formulas systematically overstate what a payor can actually afford — courts increasingly sanity-check guideline numbers against after-tax budgets.

Comparing an Alimony Amount computed here with a figure from another source that uses different conventions. Same name, different denominator — the disagreement is usually in the definitions, not the data.

One mistake is specific to this engine: assuming every input matters equally. The computation above shows Recipient cap: total income ≤ this % of combined dominating — a careful figure there beats false precision everywhere else.

Another is comparing across contexts: an Alimony Amount computed with one set of conventions should never be lined up against a figure computed with another. Check the inputs behind both before ranking them.

Alimony Amount verification checklist

• Compare the output against one published benchmark or a colleague’s independent estimate.
• Re-run the calculation with a ±10 % stress on the two most sensitive inputs.
• Re-verify Recipient cap: total income ≤ this % of combined against a source document — ten percent of error there moves the headline by ≈31.4 %.
• Check that every field the formula needs actually arrived from a document, not from recollection.
• Compare the result with one independent method or published benchmark.
• Repeat the ±10 % test on the inputs that matter and see whether the decision — not just the number — still holds.

How to use the Alimony Amount tool properly

Using a calculator well sounds trivial, but the difference between a decision-grade figure and a throwaway one lives entirely in the routine. The routine for Alimony Amount takes a minute to learn and applies to every input above.

Step 1 — start from evidence. The inputs behind Alimony Amount are payor's gross annual income, recipient's gross annual income, length of marriage (years), payor income factor (%), recipient income factor (%), difference-of-incomes factor (%) and the remaining fields listed above. Write them down with their source next to each one; if you cannot name where a figure came from, that is the input most likely to be wrong. The point of transparency is that a reader can disagree with a specific line rather than with you.

Step 2 — enter the conservative case first. Resist the flattering scenario. Type the inputs you would defend in front of a sceptical reader, read the Estimated alimony ($1,750.00 $/month for the example values), and note the verdict band. Compare the calculation to the rough guess you arrived with, and ask why they differ.

Step 3 — play with the inputs on purpose. Ten percent up, ten percent down, one field at a time. Within a few minutes you will know this calculation better than most people who quote its results. Write the figure down before moving on; memory flatters whichever number you saw last.

Step 4 — compute a corridor, not a point. Three runs — worst, likely, best — turn Alimony Amount from a snapshot into a range. Plan against the pessimistic end and treat the optimistic end as the upside story. The input you reach for first is usually the one you measured longest ago.

Step 5 — record the context, not just the number. Note today’s date and the inputs alongside the $1,750.00 $/month output. Six months from now the context is what turns this figure into a trend. One decimal place more than your data supports is one decimal place of fiction.

See also: Permanent Alimony Calculator

Who actually uses Alimony Amount — and when

Legal & Law arguments end at arithmetic or they do not end. Alimony Amount is the arithmetic: $1,750.00 $/month on the example inputs, reproducible by anyone who types the same numbers. One decimal place more than your data supports is one decimal place of fiction.

The companion outputs — 30/20 rule result and Difference-of-incomes result — exist for the second stage of that screen: the headline sizes the prize, while the companions describe the trade-off you are accepting to get it. If the answer changes your behaviour, it deserves a second run with different assumptions.

There is a personal-administration use people overlook: periodic self-checking. Alimony Amount quietly drifts as life changes — rates move, bodies change, costs compound — and re-running it a few times a year catches drift while correction is still cheap. Note the assumption you are least sure about; that is where the real risk lives.

Quick answers: what searchers ask about Alimony Amount

What affects Alimony Amount the most?

The short answer: Recipient cap: total income ≤ this % of combined. The longer answer is the sensitivity table on this page, where every numeric input was probed by ten percent and the estimated alimony recalculated — Recipient cap: total income ≤ this % of combined moved it furthest, by roughly 31.4 % ($1,200.00 $/month to $2,031.25 $/month).

Which matters more: payor's gross annual income or recipient cap: total income ≤ this % of combined?

By the numbers, Recipient cap: total income ≤ this % of combined: a ten-percent change in it moves the result ≈31.4 %, versus ≈22.9 % for Payor's gross annual income. Spend your measuring effort in that order — precision on the weaker lever buys almost nothing.

What is a typical Alimony Amount?

On the worked example above Alimony Amount comes out at $1,750.00 $/month. Treat that as one point on a distribution rather than a norm: the bands, the companion outputs and the sensitivity ranking tell you how wide the plausible range really is.

How do I calculate Alimony Amount by hand?

alimony = min( payor% × payor income − payee% × payee income, diff% × (income difference), cap% × combined − payee income ); duration = marriage years × ARA factor (50/60/70/80% by band; over 20 years is long-term) is the entire method. Work the inputs in that order — 30/20 rule: 30% × $120,000 − 20% × $45,000 = $36,000 − $9,000 = $27,000/year. — and you will reach $1,750.00 $/month on the default figures, the same number this tool prints.

What happens to Alimony Amount if recipient cap: total income ≤ this % of combined changes by 10 %?

On these inputs a ±10 % change in recipient cap: total income ≤ this % of combined takes Alimony Amount to $2,031.25 $/month against the $1,750.00 $/month example — around 31.4 % of the headline. The same test on every other field is in the sensitivity section.

Is the Alimony Amount result of $1,750.00 $/month good or bad?

The tool answers “what”, not “whether”: $1,750.00 $/month carries the verdict “$21,000 per year · guideline $2,031.25/mo (capped) · duration 101 months” for the default case, which is a starting interpretation rather than a verdict on your situation. Re-run with your own figures and compare the bands.

Is Alimony Amount accurate?

The arithmetic is exact: alimony = min( payor% × payor income − payee% × payee income, diff% × (income difference), cap% × combined − payee income ); duration = marriage years × ARA factor (50/60/70/80% by band; over 20 years is long-term) is evaluated with full floating-point precision and every substitution is printed in the worked example. What limits accuracy is input quality and the model’s assumptions, so treat the $1,750.00 $/month result as the correct answer to the question you typed — and check the assumptions section before acting on it.

Is this Alimony Amount legally binding?

No. It is an estimate that models the stated formula. Binding figures depend on jurisdiction, contract wording and procedure — which is why the disclaimer sits between this page and any professional action.

How is alimony usually calculated?

In formula states: 30–35% of the gross income difference (Massachusetts), or the 30/20 rule (30–40% of payor income minus 20–30% of recipient income), subject to the recipient's demonstrated need and a cap keeping the recipient below ~40% of combined income. In discretionary states, judges weigh statutory factors — marriage length, age, health, earning capacity, marital lifestyle — without arithmetic.

How long does alimony last?

Under the widely-copied ARA bands: 50% of the marriage length for marriages under 5 years, 60% for 5–10, 70% for 10–15, 80% for 15–20, and potentially indefinite beyond 20 years. A 15-year marriage caps general-term alimony at about 126 months. Remarriage of the recipient ends it everywhere.

Do I need an account to use this Alimony Amount calculator?

No, and no data leaves the tab. The engine runs in the page itself, which is why the worked example, the bands and the sensitivity ranking all respond instantly to your keystrokes.

The vocabulary of Alimony Amount

30/20 rule result

$2,250.00 $/month on the example inputs — a companion figure printed beside the headline of Alimony Amount so that no result is read in isolation.

Difference-of-incomes result

$2,031.25 $/month in the default Alimony Amount calculation — one of the secondary figures an experienced reader checks before trusting the primary number.

Cap (recipient at 40% of combined)

$1,750.00 $/month on the example inputs — a companion figure printed beside the headline of Alimony Amount so that no result is read in isolation.

Estimated alimony

The primary output of this tool: $1,750.00 $/month for the default inputs, computed exactly from alimony = min( payor% × payor income − payee% × payee income, diff% × (income difference), cap% × combined − payee income ); duration = marriage years × ARA factor (50/60/70/80% by band; over 20 years is long-term).

Worked example

The calculation written out in full so that nothing on this page has to be taken on trust.

Verdict band

The plain-language label — here “$21,000 per year · guideline $2,031.25/mo (capped) · duration 101 months” — mapping the computed figure onto experience-based ranges for Legal & Law.

Sensitivity (±10 %)

How far the Alimony Amount moves when a single input is nudged ten percent either way; the ranked list on this page is computed live from this engine.

Methodology, sources and limits

There is no black box on this page — the engine evaluates alimony = min( payor% × payor income − payee% × payee income, diff% × (income difference), cap% × combined − payee income ); duration = marriage years × ARA factor (50/60/70/80% by band; over 20 years is long-term). Source of record: Massachusetts General Laws ch. 208 §§ 48–55 (Alimony Reform Act of 2011: 30–35% of income difference, duration bands, 40%-of-combined cap practice); American Academy of Matrimonial Lawyers guideline formulations; Tax Cuts and Jobs Act § 11051 (post-2018 alimony tax treatment). Where a professional version of this calculation differs, it differs in inputs and jurisdiction-specific coefficients, not in the algebra — which is why re-checking your inputs beats hunting for a second calculator.

This page is an estimation aid, not professional advice. The design rule is simple: two people entering identical figures must get identical answers. The design constraint was set by usefulness rather than by comfort: an estimate you can interrogate beats an answer you have to trust.

Turning this Alimony Amount into a decision

Save the number together with its inputs and today’s date; an Alimony Amount figure without context is unusable the moment an input changes.

Whoever you are (people who need one trustworthy number before their next decision), the next step is the same: replace the example inputs with your own, note the date, and re-run whenever a figure moves. In Legal & Law, a dated figure is a trend, and an undated one is a rumour.

See also: Alimony Tax Impact Calculator