Alimony in Portsmouth: how it is calculated
Alimony in Portsmouth follows New Hampshire law, not a local rule — the same statute applies whether the case is filed in Rockingham County or anywhere else in the state. Here is what that formula produces, and where a Portsmouth case is actually heard.
Where a Portsmouth case goes
A divorce filed in Portsmouth is heard by the New Hampshire court for Rockingham County. The judge applies the state statute below; the county sets the filing procedure, not the amount. Portsmouth has about 22,938 residents (Census Bureau, 2024 estimate).
Open the full New Hampshire alimony calculator → — same formula, with every input, the statute (RSA 458:19-a) and the date it was last checked.
Formula
23% of income difference (gross), duration by marriage length
Type
Durational alimony (statutory cap; no permanent alimony)
Does Portsmouth have its own rule?
No. RSA 458:19-a applies across New Hampshire, so a case from Portsmouth is decided by the same numbers as one filed anywhere else in the state. What changes locally is the courthouse, the clerk's procedure and how long the docket takes — not the amount.
What the statute says
RSA 458:19-a — New Hampshire term alimony (2019 alimony reform).
Last checked 2026-09-02. Read the source →
Also for Portsmouth
Other New Hampshire cities
Manchester · Nashua · Concord · Dover · Rochester · Keene · Laconia · Lebanon · Claremont · Somersworth · Berlin · Franklin
Everything StateTally tracks for New Hampshire → · Alimony in every city →