How the NH RSA 458:19 Formula Determines Alimony Duration and Amounts in New Hampshire

Current as of: October 14, 2026 Alimony & Spousal Support New Hampshire
Under the New Hampshire alimony formula found in N.H. Rev. Stat. Ann. § 458:19-a, the court generally limits term spousal support payments to no more than 23% of the difference between the spouses' gross incomes (or the recipient's reasonable need), and caps duration at 50% of the length of the marriage.

Going through a divorce in Concord, Nashua, or Portsmouth can be financially terrifying, especially if one spouse earns significantly more than the other. In the past, alimony (often called spousal support) was unpredictable, leaving many families in the dark about how much they would pay or receive. Today, New Hampshire law uses a much clearer formula to bring fairness and predictability to the process. If you are asking for support to help you get back on your feet, or if you are worried about paying an unfair amount to your ex, understanding exactly how the courts apply the alimony caps is essential for planning your post-divorce financial future.

Step-by-Step Process for Determining Alimony

Step 1: Determining Eligibility

Before calculating numbers, the court must first determine if alimony is appropriate at all. Under N.H. Rev. Stat. Ann. § 458:19, the requesting spouse must prove they lack sufficient income or property to provide for their own reasonable needs, considering the standard of living established during the marriage. Conversely, the paying spouse must have the ability to meet their own needs while paying support.

Step 2: Calculating Gross Incomes

Both spouses must complete a Form NHJB-2065-F, New Hampshire, Circuit Court, Financial Affidavit. This document lists all sources of gross income, including salaries, bonuses, rental income, and investments. The court uses these gross figures as the foundation for the statutory formula.

Step 3: Applying the 23% Gross Income Difference Cap

Once gross incomes are established, the court calculates the difference between the higher earner and the lower earner. Under N.H. Rev. Stat. Ann. § 458:19-a, II(a), the statutory formula caps term alimony at the lesser of the payee's reasonable need or 23% of that difference (the statutory 30% rate under N.H. Rev. Stat. Ann. § 458:19-a, II(c) only takes effect if federal tax deductibility is restored). For example, if you earn $100,000 a year and your ex-spouse earns $40,000, the difference is $60,000. The maximum alimony a judge will typically award under the formula is 23% of $60,000, which is $13,800 per year (or $1,150 per month).

Step 4: Applying the 50% Duration Cap

The court also limits how long payments must be made. Under N.H. Rev. Stat. Ann. § 458:19-a, the maximum duration for alimony is typically capped at 50% of the length of the marriage. The clock starts on the date of marriage and stops on the date the divorce is filed in the New Hampshire Circuit Court, 9th Circuit - Family Division, Nashua or another local court.

How Different Marriage Lengths Impact Duration

The length of your marriage is the primary factor that decides how long you will pay or receive support.

Short-Term Marriages (Under 5 Years)

For short-term marriages, courts are generally reluctant to award long-term alimony. If you were married for 4 years, the absolute maximum duration under the formula is 2 years. Often, a judge may award even less time, or order a single lump-sum payment to help the lower-earning spouse transition to independence.

Medium-Term Marriages (5 to 15 Years)

In medium-term marriages, the 50% rule is heavily applied. If you were married for 10 years, you can expect to pay or receive alimony for up to 5 years. This duration is usually considered enough time for a spouse who stayed home to re-enter the workforce or obtain further education to support themselves.

Long-Term Marriages (Over 15 Years)

For marriages lasting decades, the stakes are higher. If you were married for 20 years, alimony could last up to 10 years. While the 50% cap still applies, courts have discretion to adjust awards in exceptional circumstances where justice requires, as supported by precedents like In the Matter of Fowler & Fowler, 145 N.H. 516 (NH Supreme Court 2000).

How Much Does an Alimony Case Cost in New Hampshire?

Filing for divorce and litigating alimony involves several standard costs:

  • Filing Fees: The fee to file a Petition for Divorce in a New Hampshire Circuit Court is roughly $250.
  • Financial Experts: If a spouse owns a business, hiring a forensic accountant to determine their true gross income can cost $2,500 to $5,000.
  • Lawyer Fees: An experienced family lawyer from our US Lawyers directory generally charges between $250 and $450 per hour. Contested alimony cases that go to trial can easily cost each spouse over $10,000 in legal fees.

How Long Does the Alimony Process Take?

An uncontested divorce where both parties agree on the alimony formula can be finalized in 3 to 6 months. However, if spouses disagree over what counts as gross income or whether alimony should deviate from the 23% formula, a contested divorce trial can take 12 to 18 months to resolve in the family court system.

Frequently Asked Questions (FAQ)

Is the 23% cap a strict rule or just a guideline?

It is a statutory benchmark. While judges use the 23% formula as a presumptive limit under N.H. Rev. Stat. Ann. § 458:19-a, the court may adjust the amount if justice requires, provided it issues written findings explaining the departure.

Does child support affect the alimony calculation?

Yes. In New Hampshire, child support is calculated first. The money paid in child support is usually factored out before determining the gross income available for the alimony formula.

Can a judge award lifetime alimony in New Hampshire?

It is extremely rare. Lifetime alimony is generally a thing of the past. However, for very long marriages where one spouse is disabled or at retirement age, a judge might order extended support.

What happens if the paying spouse loses their job?

If the paying spouse suffers a massive, involuntary drop in income, they can file a petition to modify the alimony payments to reflect their new financial reality.


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