New Hampshire Alimony & Spousal Support

New Hampshire overhauled its alimony framework between 2018 and 2021, replacing broad judicial discretion with a statutory formula and a hard duration cap. Under RSA 458:19-a, the amount of term alimony is the lesser of the recipient's reasonable need or 23% of the difference in the parties' gross incomes, and the maximum duration is 50% of the length of the marriage. This guide explains who qualifies for spousal support in New Hampshire, how the formula works, what triggers a modification or termination, and what to expect when retirement enters the picture.

Three Types of Spousal Support

New Hampshire recognizes three distinct forms of alimony, each serving a different purpose:

• Temporary alimony (pendente lite): Support while the divorce is pending. It ends when the final decree takes effect and generally does not count toward the formula or duration limits for the final order.
• Term alimony: The default post-decree form. Periodic payments governed by the statutory formula and 50% duration cap described below. This is what most people mean when they say “alimony” in New Hampshire.
• Reimbursement alimony: A targeted remedy that compensates a spouse for contributions to the other's financial resources—such as paying for education or job training—when property division alone would not do justice. It has a hard five-year cap and is non-modifiable unless the parties agree otherwise.

Since the 2019 reforms, “permanent” alimony is no longer a separate statutory category. Long-duration awards are still possible, but they require specific “justice requires” findings to exceed the default 50% cap.

Eligibility: Who Qualifies?

When term alimony is contested, a New Hampshire court may order it only after finding all three of the following under RSA 458:19-a:

• Need: The requesting spouse lacks sufficient income or property—including what was awarded in the property division—to meet reasonable needs at the marital standard of living, or is unable to become self-supporting through appropriate employment, or has custodial duties that reasonably limit outside work.
• Ability to pay: The other spouse can meet their own reasonable needs while also meeting the applicant's reasonable needs.
• Timing: The request must be made before the final decree takes effect or within five years after its effective date.

Both “need” and “ability to pay” are measured against the marital lifestyle, but courts recognize that maintaining two separate households costs more than one. This dual-household reality tempers expectations on both sides.

The 23% Formula

New Hampshire uses a straightforward statutory formula for calculating term alimony:

Amount = lesser of (a) the recipient's reasonable need or (b) 23% of the difference in the parties' gross incomes.

The 23% figure is calibrated to the current federal tax treatment, under which alimony is not deductible by the payer and not taxable to the recipient. If federal law ever reverts to the pre-2019 deductible/taxable regime, the statute automatically switches the formula to 30%.

“Gross income” is defined broadly to include wages, salary, commissions, bonuses, pensions, Social Security, trust income, investment income, disability benefits, and more. The formula adjusts for existing support obligations: child support actually paid is subtracted from the payer's income and added to the recipient's income, preventing double-counting.

Practical Tip: Contested awards often cluster around demonstrated reasonable need when it is lower than the 23% formula amount. Prepare a credible monthly budget with supporting documentation—the “lesser of need or formula” rule means your budget directly affects the outcome.

Duration: The 50% Cap

Term alimony may not exceed 50% of the length of the marriage, measured from the wedding date to the date the divorce petition is served. Some illustrative examples:

• 5-year marriage: Up to 2.5 years (30 months)
• 10-year marriage: Up to 5 years (60 months)
• 20-year marriage: Up to 10 years (120 months)
• 30-year marriage: Up to 15 years (180 months)

These are maximums. Actual awards are often shorter, and courts can order step-down schedules that reduce payments over time as the recipient gains employment or completes training. The court may exceed the 50% cap only upon “justice requires” findings based on statutory factors such as health, disability, financial dependency, employability, domestic abuse, or asset dissipation.

See how New Hampshire spousal support might apply to your situation:

Modification and Termination

Under RSA 458:19-aa, either party can petition to modify term alimony, but the standard is deliberately high. The requesting party must prove by clear and convincing evidence that:

1. A substantial and unforeseeable change in circumstances has occurred since the effective date of the order.
2. Modification would not cause undue hardship to either party.
3. Justice requires the change.

Common modification triggers include involuntary job loss, significant income changes, and serious health developments. Overtime or second-job income that began after the initial order is presumed irrelevant, and a subsequent spouse's income generally cannot be counted against the payer.

Term alimony terminates automatically upon the recipient's remarriage (unless the order provides otherwise) or the death of the recipient. Courts may require life insurance or other security to protect the recipient if the payer dies before completing payments.

Cohabitation Rules

If the recipient begins cohabiting in a relationship resembling marriage, the payer can petition to terminate or reduce alimony. The court considers factors including shared living arrangements, expense sharing, economic interdependence, joint property or accounts, an intimate relationship, and whether the couple holds themselves out publicly as partners. If alimony is terminated due to cohabitation, the recipient may seek reinstatement within five years if the cohabitation ends—but reinstatement cannot extend beyond any original fixed termination date.

Retirement and Social Security

Term alimony ends when the payer reaches full Social Security retirement age or actually retires, whichever is later, unless the court finds “justice requires” a different result. The payer must give at least 60 days' advance notice of retirement. A payer's capacity to keep working beyond retirement age is not a basis to extend alimony.

In limited circumstances, the court may extend alimony past retirement to equalize the parties' gross Social Security benefits. This narrow extension does not require the usual clear-and-convincing-evidence modification standard, but it is the exception rather than the rule.

Tax Treatment

For divorce decrees entered after December 31, 2018, alimony is not deductible by the payer and not taxable to the recipient under the federal Tax Cuts and Jobs Act. Pre-2019 orders retain the old deductible/taxable treatment unless a subsequent modification expressly adopts the new rules. New Hampshire has no state income tax on wages, though it does tax interest and dividends above certain thresholds—a distinction that can affect the net cost of alimony for parties with significant investment income. For a broader look at how child support interacts with alimony in New Hampshire, see our companion guide.

Frequently Asked Questions

Does New Hampshire use a formula for alimony? Yes. Since the 2019 reforms, the statutory formula is 23% of the difference in the parties' gross incomes, but the actual award is the lesser of that amount or the recipient's demonstrated reasonable need. Courts can depart from the formula when “justice requires” based on enumerated statutory factors.

How long does alimony last in New Hampshire? The default maximum is 50% of the length of the marriage, measured from the wedding date to the date the divorce petition is served. Courts can exceed the cap upon “justice requires” findings, but this is uncommon. Remarriage, retirement, and cohabitation can all end an award earlier.

Can alimony be modified after it is ordered? Yes, but the requesting party must prove a substantial and unforeseeable change in circumstances by clear and convincing evidence. Reimbursement alimony is the exception—it is non-modifiable unless the parties agree otherwise.

Does cohabitation end alimony in New Hampshire? Not automatically. The payer must petition the court and prove that the recipient is cohabiting in a marriage-like relationship under the statutory factors. If alimony is terminated for cohabitation, the recipient can seek reinstatement within five years if the relationship ends.