New Hampshire calculates term alimony using a statutory formula: 23% of the difference between both spouses' gross incomes, capped at the payee's reasonable need, for a maximum duration of 50% of the marriage length. Under RSA 458:19-a, a couple married 20 years where the higher-earning spouse grosses $150,000 and the lower-earning spouse grosses $50,000 would yield a baseline alimony amount of $23,000 per year ($1,917 per month) for up to 10 years. Filing for divorce in New Hampshire costs $250 without minor children or $252 with minor children as of 2026. The state imposes no mandatory waiting period or separation requirement before finalizing a divorce.
Key Facts: Divorce and Alimony in New Hampshire
| Key Fact | Details |
|---|---|
| Alimony Formula | 23% of the difference in gross incomes (or payee's reasonable need, whichever is less) under RSA 458:19-a |
| Maximum Duration | 50% of the length of the marriage |
| Filing Fee | $250 (no children) / $252 (with children). As of March 2026. Verify with your local clerk. |
| Waiting Period | None — New Hampshire has no mandatory waiting or separation period |
| Residency Requirement | 1 year if only one spouse lives in NH; no durational requirement if both spouses are domiciled in NH |
| Grounds for Divorce | No-fault (irreconcilable differences) under RSA 458:7-a, plus 13 fault grounds under RSA 458:7 |
| Property Division | Equitable distribution with a presumption of equal division under RSA 458:16-a |
| Alimony Types | Temporary, term, and reimbursement (defined in RSA 458:19) |
| Tax Treatment | Not deductible by payor, not taxable to payee (federal post-TCJA rules; NH has no state income tax) |
| Modification Standard | Clear and convincing evidence of substantial, unforeseeable change in circumstances |
How the New Hampshire Alimony Calculator Formula Works
New Hampshire uses a statutory formula to calculate term alimony: 23% of the difference between the parties' gross incomes at the time of the court order, or the payee's reasonable need, whichever amount is less. This formula took effect January 1, 2019, when the legislature replaced the old discretionary system with RSA 458:19-a. If federal tax law changes to make alimony deductible again, the formula automatically adjusts to 30% of the income difference.
To use an alimony calculator for New Hampshire, you need two numbers: each spouse's gross annual income. Gross income includes wages, salary, bonuses, commissions, self-employment income, investment returns, rental income, and retirement distributions. The court looks at income at the time of the order, not historical averages. Voluntary unemployment or underemployment can result in income being imputed to either party under RSA 458:19-a, IV(d).
Here is how the New Hampshire spousal support calculator formula works in practice:
- Determine Spouse A's gross annual income (higher earner): $120,000
- Determine Spouse B's gross annual income (lower earner): $45,000
- Calculate the difference: $120,000 minus $45,000 equals $75,000
- Apply the 23% formula: $75,000 multiplied by 0.23 equals $17,250 per year
- Convert to monthly: $17,250 divided by 12 equals $1,437.50 per month
- Compare to payee's reasonable need — if the payee's documented reasonable need is $1,200 per month, the court awards $1,200 (the lesser amount)
The court retains discretion to deviate from the 23% formula when "justice requires" an adjustment. The party seeking an upward or downward deviation bears the burden of proving that special circumstances warrant a different amount under RSA 458:19-a, IV.
Duration Limits: How Long Alimony Lasts in New Hampshire
New Hampshire caps term alimony at 50% of the length of the marriage, measured from the date of marriage to the date of the divorce filing. A marriage lasting 16 years produces a maximum alimony duration of 8 years. A marriage lasting 30 years caps alimony at 15 years. This duration cap is codified in RSA 458:19-a, III and represents one of the most significant changes from the pre-2019 law, which allowed indefinite alimony.
The court may extend alimony beyond the 50% cap only if both parties agree or if the court finds that justice requires a longer term. The party seeking an extension must prove the need by a preponderance of the evidence. In practice, extensions are rare and typically involve marriages exceeding 25 years where the payee has significant health limitations or advanced age that prevents self-sufficiency.
| Marriage Length | Maximum Alimony Duration | Example Monthly Amount (at $80,000 income gap) |
|---|---|---|
| 5 years | 2.5 years | $1,533/month |
| 10 years | 5 years | $1,533/month |
| 15 years | 7.5 years | $1,533/month |
| 20 years | 10 years | $1,533/month |
| 25 years | 12.5 years | $1,533/month |
| 30 years | 15 years | $1,533/month |
Note: The monthly amount in this table assumes a constant $80,000 income difference ($80,000 times 0.23 equals $18,400 per year, or $1,533 per month). Actual amounts depend on each couple's specific income figures and the payee's reasonable need.
Three Types of Alimony Available in New Hampshire
New Hampshire recognizes three distinct types of alimony under RSA 458:19: temporary alimony, term alimony, and reimbursement alimony. Each type serves a different purpose, follows different rules, and applies at different stages of the divorce process. Understanding which type applies to your situation is essential for using a spousal support calculator accurately.
Temporary alimony provides periodic support payments while the divorce case is pending in court. Temporary alimony begins when the court grants a motion during litigation and ends on the effective date of the final divorce decree. The time spent receiving temporary alimony does not count against the 50% duration cap for term alimony unless the court finds the temporary period was "unusually long" relative to the case.
Term alimony is the primary post-divorce support type in New Hampshire. Term alimony follows the 23% formula and the 50% duration cap described above. Courts order term alimony when the payee lacks sufficient income or property to meet reasonable needs considering the marital standard of living, or when the payee cannot achieve self-sufficiency through appropriate employment.
Reimbursement alimony compensates a spouse for economic or non-economic contributions to the other spouse's financial resources. The most common example is one spouse working to support the household while the other completes a professional degree. Reimbursement alimony has a maximum duration of 5 years from the effective date of the final decree under RSA 458:19-a, V. Unlike term alimony, reimbursement alimony cannot be modified after the order is entered, except by mutual agreement of both parties.
Factors That Adjust Your Alimony Estimate
New Hampshire courts begin with the 23% formula but may adjust the amount based on 11 special circumstances listed in RSA 458:19-a, IV. These factors explain why an alimony estimator provides a starting point rather than a final number. The court weighs each applicable factor and must state its reasons for any deviation from the formula amount.
The statutory adjustment factors include:
- Chronic or severe physical or mental illness, or disability of either party, which affects earning capacity or creates extraordinary medical expenses
- The degree and duration of the payee's financial dependency on the payor during the marriage
- Each party's vocational skills, education, occupation, benefits, and present or future employability
- Voluntary unemployment or underemployment by either party, which may result in income imputation
- The needs of a minor child or an adult child of the marriage who has special needs
- The property settlement awarded under RSA 458:16-a, including whether one party received significantly more property
- Diminution of significant marital assets by either party, such as dissipation or waste
- The impact of federal tax law on each party, including the allocation of tax-related benefits
- Any other factor the court deems material and relevant to the justice of the case
In practice, the most common adjustments involve health-related limitations, significant property division offsets, and cases where one spouse sacrificed career advancement to support the family. Courts in New Hampshire rarely deviate more than 25-30% from the formula amount without compelling justification documented in written findings.
Filing for Divorce in New Hampshire: Requirements and Costs
Filing for divorce in New Hampshire requires a filing fee of $250 for cases without minor children or $252 for cases involving minor children, payable to the Circuit Court — Family Division. Courts accept cash, credit cards (Visa, MasterCard, Discover with a 3% surcharge), money orders, and personal checks. Fee waivers are available for litigants who demonstrate inability to pay. As of March 2026, verify current fees with your local clerk.
New Hampshire's residency requirements depend on both parties' living situations. If both spouses are domiciled in New Hampshire when the grounds for divorce arise, either spouse may file immediately with no durational residency requirement under RSA 458:5. If only the filing spouse lives in New Hampshire, that spouse must have been domiciled in the state for at least 1 year before filing. If the plaintiff is domiciled in New Hampshire and the defendant is personally served with process within the state, no durational requirement applies.
New Hampshire has no mandatory waiting period or separation requirement before filing for or finalizing a divorce. An uncontested divorce where both parties agree on all terms typically takes 2 to 3 months from filing to final decree. A contested divorce involving alimony disputes, property division disagreements, or custody battles can take 12 to 18 months or longer depending on court schedules and discovery needs.
Property Division and Its Impact on Alimony
New Hampshire divides marital property under the equitable distribution standard with a presumption of equal (50/50) division as set forth in RSA 458:16-a. All property owned by either or both spouses is subject to division regardless of how title is held, including employment benefits, vested and non-vested pensions, retirement accounts, savings plans, and military retirement benefits. The court must provide written reasons for any deviation from the equal division presumption.
Property division directly affects alimony calculations because the property awarded to the payee reduces that spouse's demonstrated financial need. If one spouse receives the marital home worth $400,000 while the other receives $400,000 in retirement accounts, the court evaluates whether the property distribution adequately addresses each party's needs before applying the alimony formula. A spouse who receives a larger share of marital property may receive reduced alimony or no alimony at all.
New Hampshire courts consider 15 factors when dividing property unequally, including the duration of the marriage, each party's age, health, occupation, and employability, the value of property acquired before marriage, the value of property received by gift or inheritance, tax consequences, and marital fault if it caused substantial physical or mental suffering or substantial economic loss under RSA 458:16-a, II.
Modification and Termination of Alimony
Term alimony in New Hampshire terminates automatically upon the death of either party, the remarriage of the payee, or a court finding of cohabitation by the payee under RSA 458:19-aa. Cohabitation is evaluated based on whether the payee maintains a relationship resembling marriage, considering factors such as living together on a continual basis, sharing household expenses, economic interdependence, joint ownership of property, maintaining an intimate relationship, and holding oneself out as part of a couple.
Modifying an existing alimony order requires clear and convincing evidence of a substantial and unforeseeable change in circumstances. This is a deliberately high standard — routine fluctuations in income, anticipated retirement, or planned career changes generally do not qualify. Examples of changes that may warrant modification include a permanent disability that eliminates earning capacity, involuntary job loss in a declining industry, or a dramatic increase in the payor's income that was not foreseeable at the time of divorce.
A motion to establish or modify alimony must be filed within 5 years of the effective date of the final divorce decree under RSA 458:19-aa. After 5 years, the right to seek alimony is permanently waived. If alimony was terminated due to cohabitation or remarriage and the cohabitation ends or the subsequent marriage ends in divorce, the payee may petition for reinstatement within 5 years of the termination order.
Tax Implications of Alimony in New Hampshire
Alimony payments in New Hampshire are not deductible by the payor and not taxable income to the payee for all divorces finalized after December 31, 2018, under the federal Tax Cuts and Jobs Act of 2017. This federal rule applies regardless of state law and does not have an expiration date under current legislation. For divorces finalized before January 1, 2019, alimony remains deductible to the payor and taxable to the payee unless the parties modify their agreement to adopt the new tax treatment.
New Hampshire has no broad-based state income tax. The state's interest and dividends tax was fully repealed effective January 1, 2025. This means New Hampshire residents pay no state-level tax on alimony received, wages earned, or investment income. The absence of a state income tax simplifies alimony calculations by eliminating the need to account for state tax brackets when determining each party's net income.
The New Hampshire alimony formula in RSA 458:19-a explicitly addresses tax treatment. The statute sets the formula at 23% of the income difference when alimony is non-deductible under current federal law. If Congress changes the law to restore the deductibility of alimony, the formula automatically increases to 30% of the income difference to account for the tax shift from payor to payee. This built-in adjustment mechanism ensures the formula remains fair regardless of future federal tax changes.
Recent and Proposed Changes to New Hampshire Alimony Law
The New Hampshire legislature introduced House Bill 325 in January 2025, which proposed eliminating term and reimbursement alimony in no-fault divorces granted on grounds of irreconcilable differences under RSA 458:7-a. Under HB 325, alimony would only be available in fault-based divorces under RSA 458:7. As of March 2026, this bill has not been enacted into law, and the current 23% formula and 50% duration cap remain in full effect.
The most significant recent change to New Hampshire alimony law was the comprehensive 2019 overhaul that created the current three-statute framework. Before January 1, 2019, New Hampshire courts had broad discretion to award alimony without a formula or duration cap. The 2019 reform introduced the 23% formula, the 50% duration cap, defined three alimony types, established the cohabitation termination standard, and set the 5-year filing deadline. These changes brought predictability and consistency to New Hampshire alimony awards.
The New Hampshire Supreme Court's 2025 LeGault decision clarified property division rules that indirectly affect alimony. The court held that the broad definition of property in RSA 458:16-a requires courts to consider the entire value of retirement benefits — including portions earned before the marriage — when making equitable distribution. This ruling may increase the property share available to a lower-earning spouse, potentially reducing the alimony amount needed to meet that spouse's reasonable needs.
Frequently Asked Questions About New Hampshire Alimony
How is alimony calculated in New Hampshire?
New Hampshire calculates alimony at 23% of the difference between both spouses' gross incomes, or the payee's reasonable need, whichever is less, under RSA 458:19-a. For a couple with a $100,000 income gap, the formula produces $23,000 per year ($1,917 per month). Courts may adjust this amount based on 11 statutory factors including health, employability, and property division.
How long does alimony last in New Hampshire?
New Hampshire caps term alimony at 50% of the marriage length under RSA 458:19-a, III. A 20-year marriage produces a maximum 10-year alimony term. Reimbursement alimony is capped at 5 years. The court may extend duration beyond the cap only if both parties agree or if justice requires it, with the requesting party bearing the burden of proof.
Can alimony be modified in New Hampshire?
Term alimony can be modified upon clear and convincing evidence of a substantial and unforeseeable change in circumstances under RSA 458:19-aa. The motion must be filed within 5 years of the divorce decree. Reimbursement alimony cannot be modified except by agreement of both parties. Common grounds include permanent disability, involuntary job loss, or a dramatic change in either party's financial situation.
Does adultery affect alimony in New Hampshire?
New Hampshire lists adultery as a fault ground for divorce under RSA 458:7, but fault is not a direct factor in the alimony formula. Fault may influence the property division under RSA 458:16-a if it caused substantial physical or mental suffering or substantial economic loss. An unequal property division favoring the innocent spouse could indirectly reduce the alimony amount by increasing the property allocated to the payee.
What happens to alimony if the recipient remarries?
Alimony terminates automatically upon the payee's remarriage under RSA 458:19-aa. If the subsequent marriage ends in divorce, the payee may petition for reinstatement of the original alimony order within 5 years of the termination date. The court evaluates reinstatement based on the payee's current financial circumstances and the original basis for the alimony award.
Does cohabitation end alimony in New Hampshire?
Cohabitation can terminate alimony if the court finds the payee maintains a relationship resembling marriage under RSA 458:19-aa. Courts evaluate 6 factors: living together continually, sharing expenses, economic interdependence, joint property ownership, an intimate relationship, and holding out as a couple. If cohabitation ends, the payee may petition for reinstatement within 5 years.
Is alimony taxable in New Hampshire?
Alimony is not taxable income to the payee and not deductible by the payor for divorces finalized after December 31, 2018, under the federal Tax Cuts and Jobs Act. New Hampshire has no state income tax as of 2025, making alimony entirely tax-neutral for both parties. The NH formula accounts for tax treatment: 23% when non-deductible, automatically adjusting to 30% if federal law restores deductibility.
How much does a divorce cost in New Hampshire?
The filing fee for divorce in New Hampshire is $250 without minor children or $252 with minor children as of March 2026. Total divorce costs vary widely: an uncontested divorce may cost $1,500 to $5,000 in attorney fees, while a contested divorce with alimony and property disputes can range from $10,000 to $30,000 or more. Mediation costs approximately $3,000 to $7,000 and resolves most cases in 2 to 4 sessions.
Can I get alimony without a lawyer in New Hampshire?
New Hampshire allows self-represented litigants to request alimony in divorce proceedings. The court's Family Division provides self-help forms and instructions for filing. However, the 23% formula under RSA 458:19-a requires accurate gross income documentation, and the 11 adjustment factors create complexity that benefits from legal guidance. Fee waivers are available for those who cannot afford filing costs.
What is the deadline to request alimony in New Hampshire?
A motion for alimony must be filed within 5 years of the effective date of the final divorce decree under RSA 458:19-aa. After 5 years, the right to seek alimony is permanently waived and cannot be revived. This deadline applies to initial requests, not modifications of existing orders. Filing the request as part of the original divorce petition is strongly recommended to preserve all options.