How to Modify Alimony in New Hampshire

If you only remember one point about modifying alimony in New Hampshire, remember this: A substantial change in financial circumstances not contemplated at the time of the order, such that modification is necessary for justice and would impose no undue hardship. Orders under the 2019 statutory scheme follow RSA 458:19-aa, which also addresses full-retirement-age presumptions and formulas. Procedure, examples, and the opinions below hang off RSA 458:19-a, 458:19-aa. Parties may adopt 2018, 310 provisions by agreement; pre-2019 orders may remain under the older modification rules unless the court finds otherwise. Alimony terminates on the death of either party, remarriage of the recipient, or cohabitation in a marriage-like relationship (RSA 458:19-aa), or at the ordered end date; limited reinstatement is possible within five years of a cohabitation termination order.

Cohabitation and remarriage

Alimony terminates on the death of either party, remarriage of the recipient, or cohabitation in a marriage-like relationship (RSA 458:19-aa), or at the ordered end date; limited reinstatement is possible within five years of a cohabitation termination order.

Cohabitation cases are intensely fact-driven: shared finances, shared household expenses, the relationship's public character, and its duration all matter. New Hampshire procedure requires proof — surveillance or speculation is not enough, and the recipient gets discovery and a hearing before payments stop. Until a court order issues, keep paying.

Walking through New Hampshire facts

Use this walkthrough to see which New Hampshire authority does the work at each step.

A former spouse in New Hampshire asks to change periodic alimony after retirement or a drop in income.

1. File a petition to modify filed in the Circuit Court Family Division.
2. Match the facts to the New Hampshire standard: A substantial change in financial circumstances not contemplated at the time of the order, such that modification is necessary for justice and would impose no undue hardship. Orders under the 2019 statutory scheme follow RSA 458:19-aa, which also addresses full-retirement-age presumptions and formulas.
3. Check whether this award can be modified at all: Parties may adopt 2018, 310 provisions by agreement; pre-2019 orders may remain under the older modification rules unless the court finds otherwise.
4. If the request is to end support, prove a trigger: Alimony terminates on the death of either party, remarriage of the recipient, or cohabitation in a marriage-like relationship (RSA 458:19-aa), or at the ordered end date; limited reinstatement is possible within five years of a cohabitation termination order.

Prospective from the petition. The forum is the Circuit Court (Family Division) or the Division of Child Support Services (DCSS).

Step-by-step: how to file

1. Read the decree and any incorporated agreement. Parties may adopt 2018, 310 provisions by agreement; pre-2019 orders may remain under the older modification rules unless the court finds otherwise. Confirm the court retained jurisdiction to modify.
2. Confirm the forum. Modification goes to a petition to modify filed in the Circuit Court Family Division. If a party has moved away, UIFSA and registration rules determine where the petition belongs.
3. Gather evidence dated to the change. Termination notices, disability awards, pension and Social Security statements, tax returns, medical records, or evidence of the recipient's cohabitation.
4. File and serve promptly. Prospective from the petition.
5. Exchange financial disclosure. Many courts require updated financial affidavits; self-employment cases often add forensic accounting or a vocational expert.
6. Seek temporary relief if needed. Where circumstances are dire, ask the court for interim reduction or suspension pending the full hearing — New Hampshire judges can grant temporary remedies in appropriate cases.
7. Litigate, mediate, or stipulate. A settlement must be reduced to an order and entered before payment obligations change.

When the change takes effect

Prospective from the petition.

The corollary: unilaterally reducing or stopping payments before an order issues builds arrears, interest, and contempt exposure — even if you ultimately win the modification.

Awards that cannot be modified (or are hard to change)

Parties may adopt 2018, 310 provisions by agreement; pre-2019 orders may remain under the older modification rules unless the court finds otherwise.

Common traps:

• Lump-sum or property-division awards styled as alimony are usually final when entered.
• Agreement language that waives modification binds the parties even though the statute would allow a petition.
• Expired terms — once a fixed term lapses, most states will not revive it; a timely pre-expiration motion is critical.
• Jurisdiction reservations — in some states, if the decree did not expressly reserve jurisdiction to modify, no later court can.

Case law: how New Hampshire courts decide alimony modification

These LawDiver opinions show how New Hampshire appellate courts weigh changed circumstances, retirement, and cohabitation:

In the Matter of Karen Birmingham and Gregory Birmingham

In the Matter of Karen Birmingham and Gregory Birmingham, 154 N.H. 51 (2006)

…ying his request that the modification of child support and alimony be retroactive to the date of the temporary agreement rather than the date of notice to the petitioner, Karen Birmingham. We affirm. The record supports the following facts. In July 2002, the petitioner filed for divorce. The parties had two minor children. Throughout the divorce proceedings, the petitioner was…

On alimony modification, In the Matter of Karen Birmingham and Gregory Birmingham speaks to the New Hampshire dispute in this passage: "Karen Birmingham. We affirm. The record supports the following facts. In July 2002, the petitioner filed for divorce. The parties had two minor children." The surrounding opinion shows how the court applied that language to the record.

Elizabeth S. Noddin v. Charles W. Noddin, Jr.

Elizabeth S. Noddin v. Charles W. Noddin, Jr., 123 N.H. 73 (1983)

…ether it was error to grant a modification of a support and alimony decree where the defendant brought about his reduced financial condition by his own criminal conduct and where the defendant still had an asset which could be applied to meet his support and alimony obligations. We hold that it was not unfair and improper to continue the original support order, and accordingly,…

New Hampshire opinions such as Elizabeth S. Noddin v. Charles W. Noddin, Jr. are cited where alimony modification is disputed. The court stated: "ether it was error to grant a modification of a support and alimony decree where the defendant brought about his reduced financial condition by his own criminal conduct and where the defendant still had an asset which could be applied to meet his support and alimony obligations." That is the language to brief; the rest of the decision supplies the procedural posture.

In the Matter of Christopher W. Crowe and Jennifer M. Crowe

In the Matter of Christopher W. Crowe and Jennifer M. Crowe, 148 N.H. 218 (2002)

…ision {Cyr, J.) awarding the respondent, Jennifer M. Crowe, alimony, child support, and approximately twenty-five percent of the value of the marital assets. We affirm. The parties began living together in 1992, had a child in 1996, and married in 1997. The petitioner is the sole owner of two businesses, a logging operation and a trucking company. At the petitioner’s expense, t…

On alimony modification, In the Matter of Christopher W. Crowe and Jennifer M. Crowe speaks to the New Hampshire dispute in this passage: "Cyr, J.) awarding the respondent, Jennifer M. Crowe, alimony, child support, and approximately twenty-five percent of the value of the marital assets. We affirm. The parties began living together in 1992, had a child in 1996, and married in 1997." The surrounding opinion shows how the court applied that language to the record.

In the Matter of George J. Nassar and Maureen Nassar

In the Matter of George J. Nassar and Maureen Nassar, 156 N.H. 769 (2008)

…h Family Division’s (Carbon, J.) award of permanent monthly alimony to the respondent, Maureen Nassar (wife), in the amount of $1,100. We vacate and remand. I. Facts The record supports the following facts. The husband and wife are fifty-six and fifty-three years old, respectively. They were married on April 16, 1983, after residing together for approximately ten years. They ha…

In the Matter of George J. Nassar and Maureen Nassar is worth reading on New Hampshire alimony modification because the court put the point in its own words: "Family Division’s (Carbon, J.) award of permanent monthly alimony to the respondent, Maureen Nassar (wife), in the amount of $1,100. We vacate and remand. I. Facts The record supports the following facts. The husband and wife are fifty-six and fifty-three years old, respectively." Use that passage as the starting point, then read the facts that precede it.

In the Matter of James J. Peirano and Sharon L. Larsen

In the Matter of James J. Peirano and Sharon L. Larsen, 155 N.H. 738 (2007)

…old a temporary hearing to reconsider the November 13, 2000 alimony order nunc pro tunc. Without holding a hearing, the court granted the motion to reconsider over the petitioner’s objection. The court also transferred the matter to the Derry Family Division, where the domestic violence proceeding was held, at the request of the respondent. *742 In November 2000, the GAL filed…

New Hampshire opinions such as In the Matter of James J. Peirano and Sharon L. Larsen are cited where alimony modification is disputed. The court stated: "November 13, 2000 alimony order nunc pro tunc. Without holding a hearing, the court granted the motion to reconsider over the petitioner’s objection." That is the language to brief; the rest of the decision supplies the procedural posture.

Evangeline Guggenheimer v. Fred S. Guggenheimer. (Now Evans)

Evangeline Guggenheimer v. Fred S. Guggenheimer. (Now Evans), 99 N.H. 399 (1955)

…nnulment (2nd ed.) s. 14.91. Since death usually terminates alimony (Robertson v. Brewer, 88 N. H. 455), it is urged that the same rule should apply to support orders for children. However in that case the court said (p. 456): “Whether a decree specifically requiring the payment of alimony during the life of the wife may be enforced after the death of the husband, as in Farring…

On alimony modification, Evangeline Guggenheimer v. Fred S. Guggenheimer. (Now Evans) speaks to the New Hampshire dispute in this passage: "Since death usually terminates alimony (Robertson v. Brewer, 88 N. H. 455), it is urged that the same rule should apply to support orders for children. However in that case the court said (p." The surrounding opinion shows how the court applied that language to the record.

In the Matter of Herbert N. Fowler, Jr. and Cheryl K. Fowler

In the Matter of Herbert N. Fowler, Jr. and Cheryl K. Fowler, 145 N.H. 516 (2000)

…urt abused its discretion in failing to award her permanent alimony. We reverse and remand. The following facts were found by the trial court or are supported by the record. The parties were married in 1974 and moved to Iowa, *517where the plaintiff attended chiropractic college. The plaintiff was employed part-time while in school, and the defendant, who had a high school dipl…

New Hampshire opinions such as In the Matter of Herbert N. Fowler, Jr. and Cheryl K. Fowler are cited where alimony modification is disputed. The court stated: "We reverse and remand. The following facts were found by the trial court or are supported by the record. The parties were married in 1974 and moved to Iowa, *517where the plaintiff attended chiropractic college." That is the language to brief; the rest of the decision supplies the procedural posture.

Practical checklist before you file

• Identify which type of alimony your decree awards — the modification rules differ by type.
• Confirm the decree or agreement does not bar modification.
• Document the change with third-party records, not just testimony.
• For retirement motions: assemble pension statements, Social Security estimates, the divorce-era financial disclosures, and evidence of good faith.
• For cohabitation petitions: gather admissible evidence and expect a discovery fight and an evidentiary hearing.
• Keep paying until the new order is signed; calendar the effective-date rules under RSA 458:19-a, 458:19-aa.
• Search LawDiver for recent New Hampshire appellate decisions before filing.

Key takeaways

• New Hampshire calls these payments alimony, governed for modification purposes by RSA 458:19-a, 458:19-aa.
• The legal standard: A substantial change in financial circumstances not contemplated at the time of the order, such that modification is necessary for justice and would impose no undue hardship.
• Prospective from the petition.
• Termination events: Alimony terminates on the death of either party, remarriage of the recipient, or cohabitation in a marriage-like relationship (RSA 458:19-aa), or at the ordered end date; limited reinstatement is possible within five years of a cohabitation termination order.
• Parties may adopt 2018, 310 provisions by agreement; pre-2019 orders may remain under the older modification rules unless the court finds otherwise.
• File in petition to modify filed in the Circuit Court Family Division — do not wait: Prospective from the petition.
• Companion reading: New Hampshire alimony guide and how to modify child support in New Hampshire.

The legal standard in New Hampshire

A substantial change in financial circumstances not contemplated at the time of the order, such that modification is necessary for justice and would impose no undue hardship. Orders under the 2019 statutory scheme follow RSA 458:19-aa, which also addresses full-retirement-age presumptions and formulas.

Courts start from the decree, not from scratch. The judge asks what the parties and the court knew when alimony was set, what has changed since, and whether the change is significant and durable enough to make the existing terms unreasonable. The moving party carries the burden, and documentation — tax returns, pension statements, medical records, lease agreements — decides most of these cases.

Grounds that most often succeed

• Retirement. Many states now treat reaching full retirement age as a presumptive or statutory ground. Early or voluntary retirement is scrutinized: courts ask whether it was in good faith, whether it was foreseeable at divorce, and whether the recipient had a chance to save.
• Involuntary income loss. Layoffs, business failure, disability, or industry collapse — with proof of diligent job-seeking. Voluntary underemployment is commonly met with income imputation instead of relief.
• The recipient's changed need. Improved earnings, remarriage-adjacent cohabitation, an inheritance, or reduced expenses.
• Health changes. New disability or extraordinary medical costs on either side.
• Cohabitation. Alimony terminates on the death of either party, remarriage of the recipient, or cohabitation in a marriage-like relationship (RSA 458:19-aa), or at the ordered end date; limited reinstatement is possible within five years of a cohabitation termination order.

Grounds that rarely work: a new partner's income without statutory cohabitation, ordinary inflation, the payor's new family expenses standing alone, or a temporary dip in earnings.

Frequently asked questions

Can alimony be modified in New Hampshire?

Yes, in most cases. A substantial change in financial circumstances not contemplated at the time of the order, such that modification is necessary for justice and would impose no undue hardship. Orders under the 2019 statutory scheme follow RSA 458:19-aa, which also addresses full-retirement-age presumptions and formulas.

Does retirement end alimony in New Hampshire?

Retirement is a recognized ground in New Hampshire — RSA 458:19-a, 458:19-aa governs how courts weigh it. Reaching normal retirement age carries more weight than early or voluntary retirement, and the recipient's own retirement readiness is considered.

Does my ex's cohabitation stop alimony?

Alimony terminates on the death of either party, remarriage of the recipient, or cohabitation in a marriage-like relationship (RSA 458:19-aa), or at the ordered end date; limited reinstatement is possible within five years of a cohabitation termination order. You must petition the court and prove the statutory elements — the obligation does not end by operation of the new relationship alone until a judge so orders (unless New Hampshire's statute makes termination automatic on remarriage).

Can alimony be increased?

Yes, where the statute permits. Recipients who prove a material increase in need — often medical — can seek upward modification, subject to the payor's ability to pay.

Can New Hampshire courts modify alimony retroactively?

Prospective from the petition.

What if my alimony was set by agreement?

Parties may adopt 2018, 310 provisions by agreement; pre-2019 orders may remain under the older modification rules unless the court finds otherwise. Agreements matter: read the incorporated terms before assuming a petition will be heard on ordinary changed-circumstances grounds.

Related guides

• How New Hampshire calculates child support
• New Hampshire alimony / alimony guide
• How to modify alimony in New Hampshire
• How to modify child support in New Hampshire

Disclaimer

This guide is general legal information about modifying alimony in New Hampshire, not legal advice. Statutes and case law change. Confirm the current text of RSA 458:19-a, 458:19-aa and consult a licensed New Hampshire family-law attorney about your decree before filing or changing payments.