How to calculate alimony amount in a DIY divorce

Last updated 2026-07-10

Why is there no single alimony formula?

Alimony is different from child support in one way that changes everything: there is no number machine. Child support runs on state-mandated math that spits out a figure. Alimony does not. Congress never set a federal standard, and the states went their own directions.

About 41 states have written a list of factors judges must consider, but "must consider" is not "must calculate." The judge weighs the factors and uses discretion. Texas caps the amount and duration by statute. California leaves almost everything to judicial judgment. A few states still permit permanent alimony in long marriages ^[1].

Here is the part that helps you. Because there is no formula to violate, you and your spouse can negotiate any number you both accept, write it into a marital settlement agreement, and a judge will almost always approve it as long as it does not look coerced or wildly lopsided. The same discretion that makes alimony a coin flip in contested cases becomes freedom in an agreed one.

What factors do most states use to set alimony?

Even without a formula, the same factors show up state after state. The Uniform Marriage and Divorce Act, which many states used as a drafting template, lists the main ones: the financial resources of each party, the time the recipient needs to become self-sufficient, the standard of living during the marriage, the length of the marriage, and each party's age and physical condition ^[2].

Here is how those factors turn into an actual calculation.

Income gap. Courts start with gross or net monthly income for each spouse. One spouse earns $6,000 a month, the other earns $1,500, so the gap is $4,500. Most awards land somewhere between 20% and 35% of that gap, though no state mandates those percentages.

Marriage length. Short marriages (under 5 years) rarely produce alimony at all. Marriages of 5 to 15 years tend to produce term-limited support. Marriages past 15 years are where permanent or long-term support becomes possible ^[1].

Standard of living. Courts try to avoid a split where one spouse keeps living roughly as they did during the marriage while the other drops off a cliff. That is why total household income matters as much as the raw gap.

Earning capacity, more than current income. If one spouse left a career to raise kids, courts often look at what that spouse could earn after retraining, not the number on last year's W-2.

Fault, in some states. About half the states still let marital fault affect alimony. In North Carolina, a proven adulterous spouse can be barred from receiving alimony entirely ^[3].

Work through each factor in writing before you sit down together. Knowing where you both stand on income, work history, and living expenses makes the conversation shorter and less emotional.

How do different states calculate alimony differently?

The variation is real and it is large. Here is a side-by-side look at how a handful of states approach the math, using their actual statutes.

State	Method	Cap or formula?	Duration rule
Texas	Statutory factors + income gap	20% of paying spouse's average monthly gross income, max $5,000/month [4]	Max 5 years for marriages under 10 years; 7 years for 10-20 years; 10 years for 20+ years
California	"Santa Clara guidelines" (advisory, not binding)	No statutory cap	Courts consider half the length of a marriage under 10 years as a starting point
Florida	Statutory factors, no formula	No hard cap	Eliminated permanent alimony in 2023; longest award is "durational" based on marriage length [5]
New York	17-factor statutory list + advisory formula	33% of paying spouse's income minus 25% of recipient's income, capped at 40% of combined income [6]	Term support presumed; permanent rare
Illinois	33.3% of paying spouse's net income minus 25% of recipient's net income	Result capped at 40% of combined net income [7]	Duration = years of marriage x multiplier (e.g., 0.4 for a 5-year marriage)

New York and Illinois come closest to being formula states in practice. Texas is formula-capped but factor-driven below the cap. California uses advisory guidelines that courts deviate from all the time.

Want the exact statute for your state? The fastest path is your state court's self-help center. Most have a page titled "spousal support" or "maintenance" with a direct link to the code section. The National Center for State Courts keeps a directory of those self-help pages ^[8].

For background on how alimony works before you get into numbers, the alimony overview on this site covers the types (temporary, rehabilitative, permanent) and how courts treat each.

Is there a quick way to estimate an alimony amount yourself?

In states with a formula or advisory guideline, yes. Everywhere else, you are making a structured judgment call, not solving an equation.

If you are in New York or Illinois, the math is short.

New York ^[6]: Multiply the paying spouse's gross income by 0.33, then subtract 0.25 times the recipient's gross income. The result cannot exceed 40% of combined gross income. Example: payer earns $8,000/month, recipient earns $2,000/month. (0.33 x $8,000) minus (0.25 x $2,000) = $2,640 minus $500 = $2,140/month, well under the 40% cap of $4,000. So $2,140 is your starting point.

Illinois ^[7]: Same math, but on net income. The statute at 750 ILCS 5/504 spells out the duration multiplier table: a 5-year marriage uses 0.20, a 10-year marriage uses 0.40, a 15-year marriage uses 0.60, and a 20-year marriage uses 0.80.

Texas ^[4]: Take the paying spouse's average monthly gross income. Maintenance caps at the lesser of 20% of that income or $5,000. A spouse earning $7,000/month caps out at $1,400 (the 20% figure), because $1,400 is less than $5,000.

For every other state, build a plain worksheet: 1. List gross monthly income for each spouse. 2. Estimate monthly living expenses for the lower earner (rent, food, transportation, healthcare, debt payments). 3. Note the shortfall: what they need minus what they earn. 4. Look at how long the marriage lasted and whether the lower earner gave up career ground. 5. Pick a number in the range that closes part of the gap, with an end date tied to when the recipient could realistically stand on their own.

That is roughly what an attorney does informally before advising a client on a settlement number. It puts you inside a defensible range even without a state formula.

If you also need to run child support numbers, the child support calculator article walks through those income-based formulas. The two calculations interact: child support cuts the paying parent's disposable income, which then affects alimony.

How does marriage length affect the alimony calculation?

Marriage length is probably the biggest factor after the income gap. Most courts run a rough mental framework, and it is worth knowing yours before you talk dollars.

Under 5 years: alimony is rare. If awarded, it runs short, often half the marriage length or less. Judges want both people back to roughly their pre-marriage footing.

5 to 10 years: temporary or rehabilitative alimony is common. The point is giving the lower earner time to retrain or re-enter the workforce. Awards of 2 to 5 years are typical.

10 to 20 years: longer support periods, sometimes half the marriage length. Career gaps compound over a decade, so full self-sufficiency gets harder to reach.

20-plus years, especially with a non-working spouse: long-term or indefinite support becomes possible in states that still allow it. Florida eliminated permanent alimony effective July 1, 2023 ^[5], so even very long marriages there now get a capped durational award.

Pin down your bracket first. It tells you whether you are discussing a 2-year payment or a 10-year one before you ever argue about the dollar figure.

What income counts when calculating alimony?

This matters more than most people expect. Income is a lot more than your W-2.

Most states count wages and salary, self-employment income (net of legitimate business expenses, not every claimed deduction), investment income, rental income, pension and retirement distributions, disability payments, and sometimes imputed income when a court finds a spouse is voluntarily underemployed.

Bonus income gets handled inconsistently. Some courts average it over 3 to 5 years. Others toss it out as non-recurring. In a DIY settlement, be explicit: state whether your agreement rests on base salary only or total compensation including bonuses.

Imputed income is worth understanding if either spouse quit a job or took a pay cut recently. Courts can base alimony on what that spouse could earn rather than what they currently earn, if the judge believes the drop was voluntary. The Uniform Interstate Family Support Act, adopted by all 50 states, uses similar imputed-income logic ^[9].

Self-employment makes the whole thing harder, because business income flows through personal returns and deductions muddy the picture. If that is your situation, even in an uncontested case, a one-hour sit-down with a divorce attorney to confirm the right income figure can save you from locking in a bad number.

How does a DIY alimony agreement actually get approved by a judge?

You and your spouse write your agreed alimony terms into a marital settlement agreement (also called a separation agreement, property settlement agreement, or stipulated agreement, depending on your state). You submit it with your divorce petition, and it becomes part of the final decree.

Judges review agreed alimony with a much lighter hand than they use in contested cases. The usual standard is whether the deal is "not unconscionable," meaning it does not drop one party into a clearly unjust spot. If both people signed voluntarily and the terms hang together, approval is close to automatic.

A few things that get agreements bounced:

• No clear payment schedule (specify the amount, the date, and the method)
• No end date or termination trigger (remarriage, cohabitation, death)
• Missing income withholding provisions where state law requires them
• Language vague enough to be unenforceable ("payer will pay a reasonable amount")

Your state's family court self-help center will have a form agreement or at least a required-language checklist. Use it. The National Center for State Courts directory ^[8] links to each state's self-help resources.

If you want a document packet with the marital settlement agreement already structured for your state, DivorceClear's $149 complete packet includes the agreement plus the petition, financial disclosures, and every required attachment. That does not replace reading this article and knowing your numbers. It just means you are filling in blanks instead of drafting from a blank page.

Does alimony affect taxes, and does that change the calculation?

Yes, and the tax picture flipped completely in 2019.

For divorces finalized after December 31, 2018, alimony is no longer deductible by the payer and no longer taxable income to the recipient. The Tax Cuts and Jobs Act of 2017 killed both sides of that treatment for new agreements ^[10].

This changes your math. Before 2019, a sharp negotiation used the payer's tax deduction to fund a higher gross payment that cost less after tax. That trick is gone. What you agree to pay is what the payer loses after tax. What you agree to receive is what you keep, with no tax on it.

One exception: divorces finalized before January 1, 2019 kept the old deductibility rules, as long as the agreement was not modified after that date. If you are modifying a pre-2019 agreement, watch whether the modification resets the tax treatment. The IRS lays out the rules in Publication 504 ^[10].

Bottom line for a DIY calculation: both parties should negotiate in after-tax dollars now. That simplifies the arithmetic, but it also means the payer has less room to offer a bigger number.

What is the difference between temporary and permanent alimony in a DIY case?

Temporary alimony (sometimes called pendente lite support) covers the stretch between filing and the final decree. If your uncontested divorce moves fast, you may skip it entirely. If it drags for months, the lower earner may need interim support. You can put a pendente lite amount in an interim stipulation, or just agree informally and memorialize it in the final agreement.

Rehabilitative alimony is the most common type in modern divorces. It runs for a set term and helps the recipient get back to self-sufficiency. Spell out what "rehabilitation" looks like: finishing a degree, returning to work, or hitting a certain income level.

Durational alimony is a fixed-term award with no rehabilitation goal attached. Florida's 2023 statute makes durational the longest type available there ^[5].

Permanent alimony still exists in some states, mostly for very long marriages where one spouse cannot realistically become self-sufficient because of age or disability. It is genuinely rare in new agreements.

For a DIY divorce, rehabilitative or durational is the practical pick in almost every case. Language like "spousal support shall terminate no later than [date], or upon recipient's remarriage, death, or cohabitation with a romantic partner for more than 90 consecutive days, whichever is earlier" covers the standard triggers and gives the agreement clean enforcement teeth.

Can you modify alimony after the divorce is final?

In most states, alimony can be modified after a substantial change in circumstances. Common triggers: the payer loses a job, the recipient lands a big raise, or either party develops a serious health condition.

Here is the part that matters for your DIY agreement. You can make alimony non-modifiable by explicit contract language. Some states allow this, others do not. California allows non-modifiable alimony by agreement ^[1]. Texas does not let courts modify agreed contractual alimony ^[4].

Want certainty on both sides? Write in whether the amount is modifiable and under what conditions. Leave it silent, and courts apply the default state rule, which varies.

Automatic termination on the recipient's remarriage is the default in most states, but states differ. Write it in anyway. Explicit beats relying on a default you might have wrong.

What should your written alimony agreement actually say?

A valid alimony provision in a marital settlement agreement needs, at minimum:

1. The monthly amount (a specific dollar figure, not a range) 2. The start date 3. The payment method (bank transfer, check, wage withholding) 4. The duration or end date 5. Termination triggers (remarriage, cohabitation, death, whichever apply) 6. Whether the amount is modifiable or non-modifiable 7. What happens to arrears if the payer falls behind 8. Tax treatment acknowledgment (post-2018 divorces: not deductible, not taxable)

Your state may want more. California requires both parties to be advised of how their agreement affects future support rights before signing ^[1]. Some states require the agreement to state that each party had a chance to consult counsel.

Get the divorce papers requirements for your state right before you finalize anything. A missing required clause is the most common reason an agreed settlement gets sent back.

This article covers the calculation side. For the full picture of how spousal support works, including the types and how courts enforce payment, see the alimony guide.

What are realistic alimony amounts in the United States?

Hard national data on alimony awards is thin. The Census Bureau's Survey of Income and Program Participation found that about 243,000 people received alimony in 2018, with a median payment near $9,600 a year, or roughly $800 a month ^[11]. That is a national median across all marriage lengths and income levels, so treat it as context, not a target.

In higher-income marriages, awards run higher. In short marriages with two working spouses, alimony is often zero.

A survey by the American Academy of Matrimonial Lawyers found that 45% of member attorneys reported an increase in women paying alimony to men in recent years, which tracks with the reality that the calculation follows the income gap regardless of gender ^[12].

For your own number, this range framework holds up:

• Low income gap (under $2,000/month): often $0 to $500/month for a short term
• Medium gap ($2,000 to $5,000/month): often $500 to $1,500/month
• High gap ($5,000+/month): varies widely, often 20% to 35% of the gap

Nobody has clean data on how agreed uncontested settlements compare to litigated awards. The closest evidence is the advisory guidelines in New York and Illinois, which read as revealed judicial preference and make a decent sanity check on any number you negotiate.

DivorceClear's document packet includes a financial disclosure worksheet that lays out both spouses' income and expenses. That worksheet is the starting point for any realistic alimony negotiation.

Frequently asked questions

Is there a free online calculator that gives me my alimony amount?

Several sites offer alimony calculators, but treat them as rough estimates only. Most use the New York or Illinois advisory formula regardless of your state, which is wrong for the majority of filers. The only reliable calculators are the official ones from states with statutory formulas, like the Illinois formula at 750 ILCS 5/504 or the New York Domestic Relations Law Section 236. Everywhere else, no calculator replaces reading your state's actual factor list.

Can a judge reject our agreed alimony amount?

Rarely, but yes. A judge can reject an agreed term if it looks unconscionable, coerced, or if one party clearly did not understand what they signed. In practice, judges approve the large majority of negotiated alimony deals in uncontested divorces. The rejection risk climbs if the agreement waives alimony entirely for a long-term spouse with no income, or if the payment is unusually high with no income to support it.

Does alimony affect child support calculations?

Yes. In most states it works one of two ways: alimony is deducted from the payer's income before child support is calculated, which lowers the child support obligation, or it is added to the recipient's income, which lowers their child support entitlement. Calculate both at the same time, not one after the other. Running alimony first and child support separately gives you the wrong number for both.

How long does alimony last after a 10-year marriage?

A rough rule of thumb is roughly half the marriage length, so 4 to 5 years for a 10-year marriage. Texas caps it at 7 years for marriages of 10 to 20 years. Illinois applies a 0.40 multiplier to a 10-year marriage. California courts sometimes treat 10 years as the threshold for a long-term marriage warranting longer support, but there is no automatic rule.

What happens if the paying spouse stops paying alimony?

Unpaid alimony becomes a court-ordered debt. The recipient can file a motion to enforce in the issuing court, which can lead to wage garnishment, property liens, contempt findings, or license suspension depending on the state. Alimony arrears generally cannot be discharged in bankruptcy under 11 U.S.C. Section 523(a)(5), which treats domestic support obligations differently from ordinary debt.

Does cohabitation end alimony automatically?

Not automatically, unless your agreement or state statute says so. Many states let a paying spouse return to court and seek termination if the recipient is cohabiting with a partner in a way that reduces financial need. If you want cohabitation to end support without a court fight, write that language directly into your marital settlement agreement. Some states, like New Jersey, have statutes creating a rebuttable presumption in favor of termination on cohabitation.

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

Yes. In an uncontested divorce, both spouses can waive alimony entirely. Courts routinely approve voluntary waivers when both parties signed freely and there is no sign of duress. A clean waiver reads something like: "Each party waives any right to alimony, spousal support, or maintenance, past, present, and future." Once final, this waiver is hard to undo in most states, so think it through before signing.

Is alimony taxable income in 2025?

No, for divorces finalized after December 31, 2018. The Tax Cuts and Jobs Act of 2017 removed the deduction for payers and the income inclusion for recipients on all new agreements. The recipient owes no income tax on alimony received, and the payer gets no deduction. This applies to modifications of pre-2019 agreements too, if the modification expressly adopts the new tax treatment. See IRS Publication 504 for the current rules.

What is the difference between alimony and a property settlement?

Alimony is periodic cash from one ex-spouse to the other after divorce. A property settlement is a one-time division of assets and debts. They carry different tax treatment, different modification rules, and different enforcement. A lump sum labeled as a property settlement cannot later be treated as alimony for enforcement, even if it was meant to make up for a wage gap. Label every payment precisely in your agreement.

Do I need a lawyer to negotiate alimony in an uncontested divorce?

No state legally requires it. Plenty of people negotiate and finalize alimony agreements without attorneys. That said, if either spouse is self-employed with complex income, if the marriage was long with a wide income gap, or if a pension or business interest is in play, a one-time consultation before signing is money well spent. Getting the number wrong costs far more than the consultation.

How is alimony calculated for a self-employed spouse?

Courts look at net self-employment income after legitimate business expenses, not gross revenue and not every Schedule C deduction. They often average 2 to 3 years of returns and add back non-cash deductions like depreciation and personal costs run through the business. If you are negotiating against a self-employed spouse's reported income, get the last 3 years of tax returns plus profit-and-loss statements before agreeing to any number.

What is rehabilitative alimony and how long does it typically last?

Rehabilitative alimony is support paid for a fixed period to help the lower earner become financially independent, usually through education, retraining, or re-entering the workforce. It is the most common type awarded today. Duration varies by state and facts, but 2 to 5 years is common for marriages of 5 to 15 years. Some agreements tie termination to an event (earning a degree, reaching a set income) instead of a fixed date.

Can alimony be paid in a lump sum instead of monthly payments?

Yes, and sometimes it is the smarter move. A lump sum removes the risk of missed monthly payments, ends ongoing contact between ex-spouses, and gives both sides certainty. The lump sum is not taxable to the recipient under current law (post-2018 divorces), same as periodic payments. The downside is that it needs the payer to hold enough liquid assets, and the recipient has to manage a large sum responsibly.

Sources

1. California Courts Self-Help Center, Spousal/Partner Support: California permits non-modifiable alimony by agreement and still allows long-term support in marriages of long duration; judges exercise broad discretion.
2. Uniform Law Commission, Uniform Marriage and Divorce Act (1973): The Uniform Marriage and Divorce Act lists the foundational alimony factors adopted by many states: financial resources of each party, time to self-sufficiency, standard of living, marriage length, age and condition.
3. North Carolina General Statutes Section 50-16.3A: In North Carolina, a spouse who commits adultery may be barred from receiving alimony under NCGS 50-16.3A.
4. Texas Family Code Section 8.055, Texas Legislature Online: Texas caps spousal maintenance at the lesser of $5,000 per month or 20% of the paying spouse's average monthly gross income, with duration limits tied to marriage length.
5. Florida Senate Bill 1416 (2023), effective July 1, 2023 -- Florida Statutes Section 61.08: Florida eliminated permanent alimony effective July 1, 2023; the longest available form is now durational alimony with caps tied to marriage length.
6. New York Domestic Relations Law Section 236(B)(6), NY State Legislature: New York's advisory maintenance formula is 33% of the paying spouse's income minus 25% of the recipient's income, capped so combined alimony and recipient income does not exceed 40% of combined income.
7. Illinois Compiled Statutes 750 ILCS 5/504, Illinois General Assembly: Illinois calculates maintenance as 33.3% of the paying spouse's net income minus 25% of the recipient's net income, capped at 40% of combined net income, with duration set by a statutory multiplier table.
8. National Center for State Courts, Self-Help Center Directory: The NCSC maintains a directory linking to each state court's self-help center, including spousal support resources and statutory references.
9. Uniform Law Commission, Uniform Interstate Family Support Act (UIFSA): UIFSA, adopted by all 50 states, uses imputed income concepts similar to those applied in alimony calculations when a party is found to be voluntarily underemployed.
10. IRS Publication 504, Divorced or Separated Individuals: Under the Tax Cuts and Jobs Act of 2017, alimony is not deductible by the payer and not taxable to the recipient for divorce agreements executed after December 31, 2018.
11. U.S. Census Bureau, Survey of Income and Program Participation (SIPP) 2018: Approximately 243,000 people received alimony in 2018; the median annual amount received was approximately $9,600, or about $800 per month.
12. American Academy of Matrimonial Lawyers, Trends Survey: 45% of AAML attorney members reported an increase in women paying alimony to men in recent survey years, reflecting income-gap-based calculations regardless of gender.