Choosing the right interest tool for New Hampshire

Choosing an interest calculator for New Hampshire work is less about “finding a calculator” and more about locking in a repeatable, documented workflow that matches:

• The type of matter (judgment, contract, statutory claim, etc.)
• The time period (pre-judgment vs. post-judgment)
• The rate source (contract, statute, court rule)
• The compounding rules (simple vs. compound, and how often)
• The court’s expectations (state vs. federal; local practice)

This guide walks through how to select and configure an interest tool—using DocketMath’s interest calculator—for New Hampshire matters (jurisdiction code: US-NH), and how to build a workflow you can reuse and defend in your file notes.

Choose the right tool

For New Hampshire work, you want an interest tool that is:

• Jurisdiction-aware (can tag calculations as US-NH)
• Transparent (shows formulas, rates, and date logic)
• Repeatable (same inputs → same outputs, across matters)
• Documentable (easy to screenshot, export, or paste into a memo)

DocketMath’s interest tool is built around that idea. The key is configuring it correctly for the kind of New Hampshire calculation you’re doing.

Below are the main scenarios you’re likely to encounter, and how to think about the inputs and outputs for each.

1. New Hampshire judgments: basic setup

When you’re calculating interest on a New Hampshire judgment, you typically need to distinguish:

• Pre-judgment interest – from the cause-of-action date (or other legally relevant date) to the judgment date.
• Post-judgment interest – from judgment to payment (or another cutoff date).

Your interest tool should let you:

1. Select jurisdiction

   • Set jurisdiction to US-NH (New Hampshire).
   • This keeps New Hampshire-specific calculations distinct from, say, Massachusetts or federal cases and makes your workflow easier to audit.

2. Choose interest type

   • Options you’ll commonly use:

     • “Pre-judgment interest”
     • “Post-judgment interest”
     • “Custom period” (for partial or segmented runs)

3. Enter principal and dates

   • Principal: amount of the judgment (or the portion you’re running interest on).
   • Start date: date from which interest begins to run (often complaint, demand, or breach date for pre-judgment; judgment date for post-judgment).
   • End date: date through which you want interest (e.g., expected payment date, date of your calculation, or a cutoff ordered by the court).

4. Select rate and method

   • Rate source: contract rate, statutory rate, or court-ordered rate.
   • Method: simple interest vs. compound interest.
   • Compounding frequency (if applicable): annual, monthly, daily, etc.

2. Contract vs. statutory rates in New Hampshire

A good interest tool must let you switch between contract and statutory rate logic, because New Hampshire matters can involve either—or both.

A. Using a contract rate

If you have a contract specifying interest:

1. Set rate type to “Contract rate.”
2. Input the numeric rate exactly as stated:

   • Example: “12% per annum” → enter 12.0%.
3. Match the compounding rule in the contract:

   • “Per annum, simple interest” → choose simple, annual.
   • “1% per month, compounded monthly” → choose 12% per year, compounded monthly, or a monthly rate option if your tool supports it.
4. Align start date with the contract:

   • First missed payment?
   • Date of default?
   • Date of demand?

How the output changes:

• Switching from simple to monthly compounding can significantly increase total interest over multi-year periods.
• Moving the start date earlier by even a few months can materially change the interest total, which may matter for negotiation or motion practice.

B. Using a statutory or default rate

If no contract rate applies—or if a statute sets a specific rate—your tool should let you:

1. Choose “Statutory/default rate”.
2. Select “New Hampshire (US-NH)” as the jurisdiction.
3. Manually enter the rate you’ve determined from your research or order.

Because statutory rules can change over time, it’s safer to:

• Enter the actual rate you intend to use, rather than relying on a generic “default” label.
• Note the source in your file (e.g., “Using X% per annum based on [case/order/statute] as of [date]”).

How the output changes:

• Changing the rate from, say, 6% to 8% on a multi-year judgment can easily produce a double-digit percentage increase in interest.
• Changing the calculation method (e.g., from “365-day simple” to “30/360 simple”) slightly adjusts the per-day interest amount, which can add up over long periods.

3. Pre-judgment vs. post-judgment workflows

DocketMath’s interest tool supports both, but the inputs and assumptions differ.

Pre-judgment interest workflow

Use this when you’re modeling or documenting pre-judgment interest in a New Hampshire case.

Typical steps:

• Select US-NH as the jurisdiction.
• Choose “Pre-judgment interest”.
• Enter:

  • Principal: amount claimed or proven.
  • Start date: fact-driven (breach, loss, or other legally relevant date).
  • End date: judgment date (or projected judgment date).
• Set rate:

  • Contract rate (if applicable), or
  • Statutory/default rate you’ve researched.
• Choose method:

  • Usually simple interest unless there’s clear authority for compounding.
• Run the calculation and export or screenshot for your file.

How the output behaves:

• Moving the end date forward by a month adds one more month of interest at the per-day rate.
• If you adjust the principal (e.g., after revising damages), the tool should scale the interest proportionally.

Post-judgment interest workflow

Use this to track or project interest after judgment.

Typical steps:

• Select US-NH.
• Choose “Post-judgment interest”.
• Enter:

  • Principal: judgment amount (or unpaid balance).
  • Start date: judgment date (or date interest begins under the order).
  • End date: payment date, projected settlement date, or “as of” date.
• Set rate:

  • Court-ordered rate, federal vs. state rule, or default statutory rate.
• Choose method:

  • Simple vs. compound, based on the rule or order.
• Save or export the result for use in payoff letters, motions, or settlement discussions.

How the output behaves:

• If you partially pay the judgment, you can re-run the calculation with a reduced principal and a new start date (the date after payment).
• If the rate changes (e.g., different rate for a later period), you can run separate segments and sum them.

4. Segmenting New Hampshire interest periods

Real matters rarely run in a straight line. You may have:

• Different rates at different times.
• Periods where interest is tolled or paused.
• Partial principal payments that reduce the base.

Your interest tool should support a segmented or multi-period workflow. With DocketMath, you can approximate this by running multiple calculations and combining them.

Example segmentation pattern:

1. Period 1 – Pre-judgment

   • Start: date of breach.
   • End: date of judgment.
   • Rate: pre-judgment rate (contract or statutory).

2. Period 2 – Post-judgment to partial payment

   • Start: judgment date.
   • End: date of first payment.
   • Rate: post-judgment rate.

3. Period 3 – Post-payment balance

   • Start: date after payment.
   • End: payoff date or “as of” date.
   • Principal: reduced by payment amount.
   • Rate: same post-judgment rate (or new rate, if applicable).

You can then:

• Use the interest tool for each period, and
• Sum the interest across periods in a spreadsheet or memo.

5. Documenting your New Hampshire interest workflow

Courts, opposing counsel, and clients all care about how you got your numbers. The interest tool is only half the story; the other half is documentation.

A defensible New Hampshire interest workflow usually includes:

1. Jurisdiction tag

   • Clearly mark the calculation as US-NH in your notes.
   • If you work across states, this prevents cross-jurisdiction confusion.

2. Rate choice explanation

   • State whether you used:

     • Contract rate (quote or cite the clause).
     • Statutory rate (cite the statute or rule).
     • Court-ordered rate (quote the relevant order language).
   • Note the numeric rate and any compounding rule you applied.

3. Date logic

   • Identify the start date and explain why interest begins then (e.g., breach date, demand date, complaint date, judgment date).

Next steps

Run the Interest calculator now and save the inputs alongside the result so the workflow is repeatable. You can start directly in DocketMath: Open the calculator.

Capture the source for each input so another team member can verify the same result quickly.

Related reading

• Deadlines reference snapshot for New Hampshire

• Interest rule lens: Maine

• How to run deadlines in DocketMath for New Hampshire

• Why we started the DocketMath blog