How to calculate alimony amount yourself without a lawyer

Last updated 2026-07-11

Why there's no single alimony formula in most states

Alimony, also called spousal support or maintenance depending on the state, is not calculated the way child support is. Child support runs on an income-shares or percentage-of-income formula baked into state statute. Alimony usually does not. Most states hand judges a list of factors to weigh and leave the dollar amount to discretion. That ambiguity is frustrating. It also means that in an uncontested divorce, you and your spouse have real room to set the number yourselves.

The American Law Institute's 2002 Principles of the Law of Family Dissolution described U.S. spousal support awards as "highly variable" and "difficult to predict" precisely because of that discretion. ^[1] Not much has changed since.

A few states have moved toward formula-based guidance. California's Dissomaster and XSpouse software is common among practitioners but isn't a free public tool. Texas caps spousal maintenance under Texas Family Code Section 8.055, which limits monthly payments to the lesser of $5,000 or 20 percent of the paying spouse's average monthly gross income. ^[2] Kansas and Virginia also set statutory ceilings. Where your state has a cap, start there. Where it doesn't, you're building your estimate from scratch.

For a broader look at how spousal support works before you run any numbers, see our guide to alimony.

What factors do courts actually weigh when setting alimony?

Every state publishes the list of factors its courts consider. The wording differs but the overlap is heavy. Here are the core ones, plus the honest truth about how much weight each carries.

Income gap between spouses. This is the single most important variable. Courts want to know how large the disparity is and whether one spouse genuinely can't meet reasonable needs without help. A $20,000 annual gap reads very differently than a $120,000 gap.

Length of the marriage. Short marriages (under 5 years) rarely produce long-term alimony. Marriages over 20 years are the ones most likely to generate indefinite support. Practitioners use informal thresholds: under 5 years, a few years of support at most; 10 to 20 years, support often runs roughly a third to half the marriage length; over 20 years, open-ended awards become realistic.

Standard of living during the marriage. Courts look at what both spouses were used to and ask whether the lower earner can hold something close to that without support.

Earning capacity, more than current income. If you left a $90,000 career to run the household, a court considers what you could earn if you returned to work. That's called imputed income.

Contributions to the other spouse's career or education. Put your spouse through medical school, or relocated repeatedly for their promotions? Courts take that seriously.

Age and health of both spouses. An older spouse with a chronic condition faces a harder road back to self-sufficiency.

Custody and childcare obligations. A primary caregiver has less room to increase earnings, and courts know it.

The Uniform Law Commission's Uniform Marriage and Divorce Act, which many states modeled their statutes on, lists these factors in Section 308. ^[3] Read your state's equivalent statute directly. Most court self-help centers post it in plain language.

How to estimate a monthly alimony amount step by step

Here's a method that mirrors what many attorneys do for a quick estimate. It won't produce a court order. It gives you a defensible starting point for negotiation.

Step 1: Calculate both spouses' monthly net incomes. Start with gross monthly income (salary, self-employment, rentals, interest, anything regular and recurring). Subtract federal and state income taxes, Social Security and Medicare, and mandatory deductions like health insurance. Use take-home pay, not gross. If income is irregular (freelance, commission, seasonal), average the last two to three years of tax returns.

Step 2: Subtract reasonable monthly expenses for the lower-earning spouse. List housing, food, transportation, healthcare, childcare, and other baseline costs. If that total tops their net income, the shortfall is the ceiling on what support they actually need. A court won't order more than the need.

Step 3: Check what the higher-earning spouse can actually pay. Run the same expense list for the payer. Whatever's left after their reasonable expenses is the floor of their ability to pay. A court won't order more than this either. The sustainable range sits between zero and the smaller of (a) the recipient's need and (b) the payer's surplus.

Step 4: Apply any statutory cap your state imposes. If your state caps alimony (Texas, Kansas, Virginia, among others), your estimate can't exceed that cap no matter the need or ability to pay. ^[2]

Step 5: Adjust for marriage length. Most practitioners apply an informal duration multiplier. A rough guideline used in some jurisdictions: support lasts about one year for every three to five years of marriage for moderate-length marriages. That's a rule of thumb, not law, but it's widely used at the negotiating table.

Step 6: Check your state's specific factors. Go to your state court's self-help center (most sit at courts.[state].gov) and find the alimony statute. Read the factor list. Add or subtract weight based on how your situation maps to each one.

One honest caveat. This estimate can be off by a meaningful margin in cases with complex assets, business income, or a long marriage with high disparities. It works best for straightforward situations with W-2 income on both sides.

Do any states use an actual alimony formula you can plug numbers into?

Yes, a few do, and knowing which ones matters.

Texas is the clearest example. Texas Family Code Section 8.055 caps maintenance at the lesser of $5,000/month or 20% of the obligor's average monthly gross income. ^[2] The statute also requires a marriage of at least 10 years (with exceptions for family violence or disability) before a court can even order maintenance. So in Texas you run one calculation: 20% of the paying spouse's gross monthly income, cap at $5,000, and you have the statutory ceiling. Duration is capped at 5 years for a 10-19 year marriage, 7 years for a 20-29 year marriage, and 10 years for marriages of 30 years or more.

Virginia has a statute (Virginia Code Section 20-107.1) that lists 13 specific factors but leaves amounts to discretion. ^[4] Virginia does bound the time frame for some support types at roughly the length of the marriage.

Kansas caps the duration of maintenance at 121 months under K.S.A. 23-2904. ^[5]

New York has used an advisory formula since 2015 that courts follow unless they deviate and explain why. For divorces filed on or after January 25, 2016, the formula takes 30% of the payor's income minus 20% of the payee's income, capped so the payee gets no more than 40% of combined income. New York's official guidance on the Maintenance Guidelines Law is a genuinely useful public document. ^[6]

For states without a formula, California's county courts post local rules, and many practitioners start from roughly 40% of the higher earner's net income minus 50% of the lower earner's net income. That's a working estimate, not statute. ^[9]

State	Formula/Cap?	Max monthly	Duration cap
Texas	Yes (statute)	Lesser of $5,000 or 20% of gross	5-10 yrs depending on marriage length
New York	Advisory formula	30% payor - 20% payee income, max 40% combined	Marriage-length-based tiers
Kansas	Duration cap only	Discretionary	121 months
Virginia	13-factor statute	Discretionary	Usually ≤ marriage length
California	No statute formula	Discretionary	Often ~half the marriage length
Most other states	Factor list only	Discretionary	Discretionary

What income do you include when calculating alimony?

Courts read income broadly, and this is where DIY calculations often go wrong by being too narrow. Here's what typically counts.

Regular wages and salary are the obvious start. Self-employment income counts after legitimate business expenses, but not all claimed deductions; courts often add back depreciation and personal expenses run through a business. Bonuses and commissions get averaged over two to three years rather than taken at peak value. Rental income counts after actual expenses. Investment income and dividends count. Unemployment and disability benefits count in most states.

What about imputed income? If either spouse is voluntarily underemployed or unemployed, courts can attribute what they could earn based on education, work history, and the local job market. This matters a lot when one spouse cut hours or stopped working. If you're the higher earner and your partner hasn't worked in 15 years, expect the court to look at current earning capacity, not $0.

Social Security income counts in most states. Gifts and inheritances generally don't count as income for alimony, though they may affect need. Workers' compensation and personal injury settlements get handled differently state by state.

The IRS changed a major piece of this on January 1, 2019. Under the Tax Cuts and Jobs Act, alimony paid under agreements executed after December 31, 2018 is no longer deductible by the payer and no longer taxable to the recipient. ^[7] That flipped the tax math practitioners had used for decades. If you're comparing your situation to older guidelines or older agreements, their numbers may reflect the old treatment. Adjust for it.

How does marriage length affect the alimony calculation?

Marriage length is the most reliable predictor of alimony duration, even in discretionary states. Courts treat it as a proxy for how much one spouse's career and earning potential got shaped by the marriage.

Here's the rough framework most practitioners use as a starting point in negotiation, drawn from common patterns across U.S. states. These aren't laws. They're the working assumptions experienced attorneys apply before adjusting for the facts.

Marriages under 5 years: alimony is uncommon unless there's a dramatic income gap, a disability, or children. When awarded, duration usually runs 1 to 2 years.

Marriages of 5 to 10 years: short-term rehabilitative support becomes realistic. Duration is often 2 to 5 years. The goal is giving the lower earner time to raise their earning capacity.

Marriages of 10 to 20 years: this is where awards get substantial. A duration of one-third to one-half the marriage length is a common negotiation anchor.

Marriages over 20 years: long-term or permanent support becomes realistic, especially when one spouse left the workforce or has limited earning capacity from age or health. Texas allows a 10-year maintenance order for marriages of 30 years or more. ^[2]

One practical note. If your state's statute says "long-term marriage" without defining it, check case law from your county. Courts in major metro areas often read these terms differently than rural courts in the same state.

Can you use an online alimony calculator and trust the number?

Online alimony calculators exist. Treat the output as a ballpark, not a prediction.

The honest problem: most calculators run on generic factors and national averages. They can't account for your judge's tendencies, your county's culture around alimony, whether your state's caselaw shifted recently, or the specific facts of your marriage. A calculator that spits out $1,400/month is telling you the median of a wide distribution, not your number.

They're useful for one thing. Making sure you're in the right universe. If your own calculation lands at $800/month but every calculator you try returns $2,500 to $3,000, that's a signal your method is off and worth revisiting. The calculators can sanity-check your arithmetic even when they can't replace judgment.

For states with real formulas (New York, Texas), a calculator built for that state's statute is reasonably reliable on the mechanical math. New York's courts publish official guidance on the maintenance formula, and a calculator that faithfully runs that math can be trusted for the output, though the discretionary adjustments judges add on top still vary. ^[6]

If you and your spouse have agreed on a number that feels fair to both of you, that agreement matters more than any calculator. In an uncontested divorce, the judge's job is mostly to confirm the agreement isn't unconscionable, not to second-guess a figure you both accept. See our overview of divorce papers for how to document an agreed support term in your settlement agreement.

How do taxes change the real value of an alimony payment?

This is one of the most practical questions in any alimony negotiation, and the answer changed in 2019.

For agreements signed before January 1, 2019: the old rules still apply to those specific agreements. The payer deducts alimony from federal taxable income; the recipient reports it as taxable income. That tax arbitrage often let couples structure a larger gross payment that cost the payer less after taxes, which raised the recipient's real benefit.

For agreements signed on or after January 1, 2019: no deduction for the payer, no income for the recipient. ^[7] The IRS states it plainly in Publication 504. The practical result is that the after-tax cost of paying alimony is higher now, which has pushed many agreed amounts downward.

Always compare after-tax dollars. A $2,000/month payment under the post-2018 rules puts exactly $2,000 in the recipient's pocket, tax-free. Under the old rules, a $2,000 payment might have been taxed at the recipient's marginal rate, so the real benefit could have dropped to $1,600 or less depending on their bracket.

State income tax treatment varies. Some states conformed to the federal change; others still run the old way. Check your state's revenue department for the current rule. California, for one, kept the old deductibility rules for state income tax even after the federal change.

What if you're self-employed? How do you calculate income for alimony?

Self-employment income is the most contested income issue in alimony cases, including uncontested ones. Courts look at the actual economic benefit flowing to the self-employed spouse, more than the net profit on Schedule C.

Start with Schedule C net profit from the most recent 2 to 3 years of federal returns. Then add back: depreciation (a non-cash expense), personal expenses run through the business (car, phone, meals beyond what's clearly business), and retirement contributions above normal market levels. Courts also watch for income suppressed in anticipation of divorce, especially if the business suddenly started showing unexplained losses.

When a spouse is both owner and employee of their business, courts sometimes use the total of (a) a reasonable market-rate salary for the work they do, and (b) a share of business profits tied to their personal effort (as distinct from the value of business assets, which is a property division question).

If self-employment income is genuinely variable because of market factors rather than choices, a three-year average is the fairest approach. If it's been growing 20% a year, courts sometimes use a forward projection instead of an average.

For the receiving spouse analyzing the payer's self-employment income, the most useful documents are three years of complete federal tax returns (all schedules), three years of business bank statements, and the most recent profit and loss statement. In an uncontested divorce, both spouses usually exchange these voluntarily as part of financial disclosure.

How do you document and propose a calculated alimony amount in your divorce agreement?

Once you have a number, it goes into your Marital Settlement Agreement (sometimes called a Separation Agreement or Property Settlement Agreement, depending on the state). This is the binding contract the court approves as part of your divorce decree.

The agreement should specify the monthly amount, the start date, the duration or end conditions (remarriage of the recipient, death of either party, a specific calendar date, or a combination), how payments get made (direct deposit, check), and how the amount can change if circumstances change substantially.

Be specific about modification. Most states let either party petition for modification on a material change in circumstances, which usually means a significant income change, job loss, or health event. Want to lock the amount permanently (a non-modifiable award)? Say so explicitly. Some states allow non-modifiable alimony by agreement; others don't.

The post-2018 tax rules cut the complexity here, since there's no longer a deduction contingency to manage. But if either spouse is near retirement or has a child graduating soon (which affects childcare costs), build in a review clause or a scheduled step-down.

DivorceClear's $149 document packet includes a Marital Settlement Agreement template that covers spousal support terms, with prompts for duration and modification language. It helps you translate your calculated number into legally recognized language without starting from a blank page. If your agreement is complex, your state court's self-help center often reviews settlement agreements for free or low cost.

For the full paperwork picture, see our article on divorce papers.

What are the most common mistakes people make when estimating alimony themselves?

A handful of errors come up again and again.

Using gross income instead of net. Courts in most states compare after-tax take-home pay when weighing need and ability to pay. Gross income overstates both and produces an unrealistic result.

Ignoring imputed income. If you're the lower earner and haven't worked in years, the court may attribute income to you based on your education and work history. Skip this and your estimate of need is inflated.

Forgetting the tax rule change. Post-2018 alimony isn't deductible. Older calculators or guidelines built for pre-2019 rules give you a systematically wrong answer. ^[7]

Treating alimony as permanent when it probably isn't. Most modern awards are rehabilitative, with a fixed end date. Calculate a permanent award for an 8-year marriage where your spouse holds a college degree, and the judge reviewing your agreement will balk.

Not checking for a statutory cap. Live in Texas, miss the $5,000 cap, and you might agree to something the court won't approve. ^[2]

Mixing property division with support. A large cash settlement to equalize property is not alimony. Don't let a lump-sum property equalization payment stand in for properly structured support, or the IRS and state tax authorities may characterize it differently than you meant.

Anchoring too hard on an online calculator. The calculator can start the conversation. It can't finish it.

Should you agree to alimony without a lawyer reviewing the agreement?

This is the honest question behind all of it. Here's a straight answer.

For straightforward situations (a short marriage, clear W-2 income on both sides, a modest income gap, and mutual agreement on a round number), you don't need an attorney to calculate or document alimony. The math is simple, the statutes are public, and courts approve mutually agreed spousal support terms in uncontested divorces routinely.

For complex situations (long marriages with large income gaps, one spouse's self-employment or business ownership, serious health issues, or major retirement assets in play), a consultation with a divorce attorney is almost always worth the cost. Not because you can't understand the factors yourself, but because the dollar stakes are high enough that a few hundred dollars for a one-hour consult is cheap insurance.

If you'd be the one receiving alimony and you're thinking about waiving it in exchange for a larger share of assets, run that trade carefully. A higher property settlement carries no guaranteed income stream, and courts are reluctant to reopen property divisions later. Waiving alimony is usually permanent.

The practical path for most people doing an uncontested divorce: calculate a number yourself using the method above, check it against your state's specific factors and any statutory cap, agree on a figure with your spouse, and write it into your settlement agreement clearly. If the number is large or the marriage was long, get one attorney to review the agreement (just review the document, not represent you through the whole divorce) before you sign.

The divorce rate in America means courts process enormous volumes of uncontested cases. A clean, internally consistent agreement with a reasonable alimony figure moves through the system without controversy.

This article is general information, not legal advice. For advice specific to your situation, consult a licensed attorney in your state.

Frequently asked questions

Is there a free alimony calculator I can trust?

There's no single authoritative free calculator for every state. For states with statutory formulas like Texas and New York, a calculator built for that state's specific statute is reasonably reliable on the mechanical math. For discretionary states, free calculators give you a ballpark only. Your state court's self-help center is the best free resource; many publish worksheets that walk you through the statutory factors for your jurisdiction.

How long does alimony typically last for a 10-year marriage?

A 10-year marriage most commonly produces alimony lasting 3 to 5 years, though it varies by state. Some practitioners use one year of support for every three years of marriage as a rough anchor. Texas allows up to 5 years of maintenance for a 10-19 year marriage under Family Code Section 8.055. No rule is universal; your state's statute and the specific facts determine the actual range.

Can spouses agree to zero alimony even if one earns much less?

Yes. In an uncontested divorce, spouses can waive alimony entirely, and courts generally respect that as long as both parties entered it voluntarily and knew their rights. The waiver is usually permanent and very hard to reopen later. If you're the lower earner considering a waiver, understand what you're giving up before you sign, especially in a long marriage with a large income gap.

What happens to alimony if the paying spouse loses their job?

Job loss is generally a material change in circumstances that lets the paying spouse petition the court to modify or suspend payments. It isn't automatic; the payer has to file a motion. Courts look at whether the loss was voluntary or involuntary and how long it's likely to last. If your agreement says the alimony is non-modifiable, that clause controls, and a court may not be able to reduce it even for job loss.

Does alimony stop automatically when the recipient remarries?

In most states, yes, remarriage of the recipient terminates alimony by operation of law or by standard agreement language. Cohabitation with a new partner is different and handled inconsistently: some states allow modification on proof of cohabitation, others don't. Make sure your agreement spells out the termination conditions rather than relying on default state rules, which vary and can surprise you.

How do courts treat a spouse who quit their job before the divorce?

Courts impute income. If a spouse left work or cut hours without a good reason (caregiving for children or a medical condition qualify), most courts attribute income based on that spouse's earning capacity: education, work history, age, and the local job market. Voluntary underemployment doesn't reduce the payer's alimony obligation or inflate the recipient's apparent need in most jurisdictions.

Is alimony taxable income in 2025?

For divorce or separation agreements signed on or after January 1, 2019, alimony is not deductible for the payer and not taxable for the recipient under federal law, per the Tax Cuts and Jobs Act. ^[7] Agreements signed before that date still follow the old rules (deductible for the payer, taxable for the recipient) as long as they haven't been modified to opt into the new rules. State income tax treatment varies; check your state's revenue department.

What's the difference between alimony and child support in the calculation?

Child support uses a statutory formula in every state, based on parenting time and both parents' incomes. Alimony is separate, usually discretionary, and based on spousal need and ability to pay. The two are calculated independently, though courts weigh existing child support obligations when judging the payer's ability to also pay alimony. You can't combine them into a single unallocated payment under post-2018 tax rules without losing the clean tax treatment. See our child support calculator article for more.

Can a judge reject an alimony amount we both agreed to?

Rarely, but yes. Judges review settlement agreements for basic fairness and reject terms that look unconscionable, coerced, or that violate state statutes (like an amount above a statutory cap). In practice, most agreed amounts get approved as long as the agreement reflects both parties' voluntary informed consent and doesn't look like one spouse was pressured or misled. A well-documented agreement with both parties' financial disclosures on record is very unlikely to be rejected.

How do you calculate alimony when one spouse has rental property income?

Rental income counts after deducting actual, documented operating expenses like mortgage interest, property taxes, insurance, and real maintenance costs. Courts often scrutinize inflated expense claims on rentals. Depreciation is typically added back because it's a non-cash deduction. If the rental income fluctuates, use a 2-3 year average from Schedule E of the federal tax returns rather than a single peak or trough year.

What's the maximum alimony amount a court can order?

There is no universal maximum. Texas caps maintenance at the lesser of $5,000/month or 20% of the paying spouse's average monthly gross income under Texas Family Code Section 8.055. ^[2] Kansas caps duration at 121 months. Most states have no cap; the ceiling is the paying spouse's actual ability to pay after their own reasonable expenses. In practice, courts rarely order alimony that leaves the payer unable to meet basic needs.

How far back do courts look at income history when calculating alimony?

Most courts look at the two to three most recent years of income, using tax returns as the primary evidence. If income has grown consistently, a court might weight recent years more heavily. If income is irregular (commissions, bonuses, self-employment), a three-year average is standard. Courts are also alert to income that dropped suddenly just before or after the divorce filing, which may be treated as voluntary suppression.

Can you modify alimony later if your financial situation changes significantly?

Yes, in most states, either party can petition for modification on a substantial change in circumstances: a major income change, job loss, serious illness, or the recipient's remarriage. The standard varies; some states require a 15-20% or greater income change before a modification is granted. If your settlement agreement states the alimony is non-modifiable, courts in most states enforce that clause and deny modification requests even for significant life changes.

Sources

1. American Law Institute, Principles of the Law of Family Dissolution (2002), Section 5: Spousal support awards in the U.S. are highly variable and difficult to predict due to judicial discretion
2. Texas Legislature, Texas Family Code Section 8.055: Texas caps spousal maintenance at the lesser of $5,000/month or 20% of the obligor's average monthly gross income, with duration caps of 5-10 years depending on marriage length
3. Uniform Law Commission, Uniform Marriage and Divorce Act, Section 308: The Uniform Marriage and Divorce Act lists the standard factors courts use to determine spousal maintenance including earning capacity, standard of living, and duration of the marriage
4. Virginia Legislative Information System, Virginia Code Section 20-107.1: Virginia Code Section 20-107.1 lists 13 specific factors courts must consider when determining spousal support
5. Kansas Legislature, K.S.A. 23-2904: Kansas caps the duration of maintenance at 121 months
6. New York Courts, Maintenance Guidelines Law guidance: New York adopted an advisory maintenance formula in 2015 using 30% of the payor's income minus 20% of the payee's income, capped so the payee receives no more than 40% of combined income
7. IRS, Publication 504: Divorced or Separated Individuals: Under the Tax Cuts and Jobs Act, alimony paid under agreements executed after December 31, 2018 is not deductible by the payer and not includible in the recipient's gross income
8. U.S. Congress, Tax Cuts and Jobs Act of 2017, Pub. L. 115-97, Section 11051: The Tax Cuts and Jobs Act eliminated the alimony deduction for divorce agreements executed after December 31, 2018
9. California Courts Self-Help Center, Spousal or Partner Support: California uses discretionary judicial review for spousal support amounts with no statutory formula; courts often consider roughly 40% of higher earner's net minus 50% of lower earner's net as an informal starting point
10. U.S. Census Bureau, Number, Timing, and Duration of Marriages and Divorces: 2016: Data on marriage length and divorce timing in the United States
11. IRS, Instructions for Form 1040, Alimony Paid/Received line guidance: Post-2018 alimony is neither deductible for the payer nor taxable for the recipient at the federal level