Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Estimated monthly support
$1,800
Formula amount before cap
$2,220
Likely duration
6.0
Total over the term
$129,600
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter payor monthly income ($).
- 2Enter recipient monthly income ($).
- 3Enter payor factor (%).
- 4Enter recipient factor (%).
- 5Enter length of marriage (years).
- 6Read your estimated monthly support on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
Many jurisdictions use a rough guideline: a percentage of the higher earner's income minus a percentage of the lower earner's, capped so the recipient does not exceed a share of combined income. Duration is often tied to marriage length.
Worked example
Using the values the calculator loads with:
Inputs
- Payor monthly income: 9000 $
- Recipient monthly income: 3000 $
- Payor factor: 33 %
- Recipient factor: 25 %
- Length of marriage: 12 years
Results
- Estimated monthly support: $1,800
- Formula amount before cap: $2,220
- Likely duration: 6
- Total over the term: $129,600
What each field means
Inputs
- Payor monthly income ($)
- The payor monthly income used in the calculation, measured in $. Starts at 9000 $ so you have a working example on load.
- Recipient monthly income ($)
- The recipient monthly income used in the calculation, measured in $. Starts at 3000 $ so you have a working example on load.
- Payor factor (%)
- The payor factor used in the calculation, measured in %. Starts at 33 % so you have a working example on load. Accepted range: 10–50 %.
- Recipient factor (%)
- The recipient factor used in the calculation, measured in %. Starts at 25 % so you have a working example on load. Accepted range: 10–50 %.
- Length of marriage (years)
- The length of marriage used in the calculation, measured in years. Starts at 12 years so you have a working example on load.
Results
- Estimated monthly support
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Formula amount before cap
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Likely duration
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total over the term
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
Is alimony tax deductible?
For US divorce agreements executed after 2018, alimony is not deductible by the payor and not taxable to the recipient. Older agreements may follow the previous rules.
Do judges have to follow a formula?
In most places guideline formulas are advisory for spousal support. Judges weigh earning capacity, health, and standard of living, so real orders vary widely.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Alimony / Spousal Support Estimator. Retrieved from https://www.revenuelab.fyi/toolbox/alimony-estimate
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/alimony-estimate" target="_blank" rel="noopener">Alimony / Spousal Support Estimator — RevenueLab</a> (2026).</p>
Source: [Alimony / Spousal Support Estimator — RevenueLab](https://www.revenuelab.fyi/toolbox/alimony-estimate) (2026).