Worked example: interest in Maine
7 min read
Published April 12, 2025 • Updated February 2, 2026 • By DocketMath Team
Worked example: interest in Maine
Calculating interest sounds simple—until you actually have to do it for a real case or negotiation. Maine adds its own twists: different statutory rates, contract rates, and questions about when interest starts and stops.
This walkthrough shows how a single example flows through the DocketMath interest calculator for Maine (US-ME), and how small changes in your inputs move the numbers.
Note: This is an educational example, not legal advice. Maine law is detailed and changes over time. For any real matter, confirm the applicable rate and rules with current law or qualified counsel.
Example inputs
We’ll build one realistic scenario and stick with it.
Imagine:
- You represent a plaintiff in Maine Superior Court.
- You have a money judgment.
- You want to estimate post-judgment interest to today’s date for settlement talks.
We’ll use DocketMath’s Interest calculator for US-ME (Maine):
Primary CTA: Try this in DocketMath’s interest calculator
Scenario overview
- Principal (judgment amount): $85,000
- Type of interest: Post-judgment interest
- Jurisdiction: Maine (US-ME)
- Interest basis: Statutory rate (not a contract rate)
- Interest method: Simple interest (no compounding)
- Judgment date: March 15, 2022
- End date (through): February 1, 2025
- Partial payments: One partial payment on June 1, 2023 of $20,000
- Day-count basis: Actual/365 (typical for statutory simple interest calculations)
We’ll also assume:
- The parties did not agree to a different contract rate that overrides the statutory rate.
- Interest runs from the judgment date through the calculation date, inclusive of start date and exclusive of end date (a common convention; your exact convention may differ).
Pitfall: Many people assume interest stops when an appeal is filed or when a settlement offer is made. That’s not always true. The calculator only follows the dates you enter—it does not know about stays, tenders, or procedural quirks unless you model them with start/stop dates and payments.
What you enter into DocketMath
In the DocketMath interest tool for Maine, this example maps to:
- Jurisdiction
- Jurisdiction:
United States – Maine (US-ME) - Context:
Post-judgment interest
- Principal and dates
- Principal amount:
85,000.00 - Interest start date:
2022-03-15 - Interest end date (through):
2025-02-01
- Rate selection
- Rate type:
Statutory - Rate source:
Maine post-judgment rate - Compounding:
None (simple interest)
- Payments / credits
- Payment 1:
- Date:
2023-06-01 - Amount:
20,000.00 - Apply to:
Principal first, then interest
- Day-count and conventions
- Day-count basis:
Actual/365 - Include start date, exclude end date:
Yes(if the tool exposes this setting)
Once these are in, you’re ready to run the calculation.
Example run
Below is a worked-through version of what DocketMath is doing under the hood. The numbers are illustrative; your actual rates and outputs may differ depending on the statutory rate in effect and any local rules.
Run the Interest calculator using the example inputs above. Review the breakdown for intermediate steps (segments, adjustments, or rate changes) so you can see how each input moves the output. Save the result for reference and compare it to your actual scenario.
1. Break the timeline into segments
Because we have a payment partway through, DocketMath splits the calculation into segments:
- From 2022-03-15 to 2023-06-01 (before payment)
- Payment applied on 2023-06-01
- From 2023-06-01 to 2025-02-01 (after payment)
This makes the math transparent and lets you see how each period contributes to the total.
2. Assume a statutory rate
For this example, we’ll assume a fixed 6% annual simple interest rate for the entire period, just to keep the math readable.
Warning: Maine’s actual statutory post-judgment rate is set by statute and can change over time or depend on external benchmarks (like Treasury yields). Always confirm the rate that applied during your specific period.
We’ll call the annual rate:
- r = 6% = 0.06
3. Segment 1: Interest before the payment
- Start date: 2022-03-15
- End date: 2023-06-01
- Principal: $85,000
3.1 Count the days
Using Actual/365 and excluding the end date:
- From 2022-03-15 to 2023-03-15: 365 days (2022–2023 is not a leap-year span)
- From 2023-03-15 to 2023-06-01: 78 days
- March 15–31: 17 days
- April: 30 days
- May: 31 days
- Total: 17 + 30 + 31 = 78
Total days in Segment 1:
- 365 + 78 = 443 days
3.2 Compute interest
Formula (simple interest):
[ \text{Interest} = \text{Principal} \times r \times \frac{\text{Days}}{365} ]
[ \text{Interest}_1 = 85{,}000 \times 0.06 \times \frac{443}{365} ]
First compute the fraction:
- 443 / 365 ≈ 1.2137
Then:
- 85,000 × 0.06 = 5,100
- 5,100 × 1.2137 ≈ 6,186.87
So, for Segment 1:
- Interest₁ ≈ $6,186.87
DocketMath will show something close to this, depending on exact day-count settings and rounding.
4. Apply the payment
On 2023-06-01, a payment of $20,000 is made and applied:
- First to accrued interest, then to principal.
Before payment:
- Principal: $85,000.00
- Accrued interest: ≈ $6,186.87
Payment: $20,000.00
Apply to interest first:
- Remaining interest after payment:
6,186.87 − 6,186.87 = $0.00 (interest fully paid) - Remaining payment to apply to principal:
20,000.00 − 6,186.87 = $13,813.13
Apply remainder to principal:
- New principal after payment:
85,000.00 − 13,813.13 = $71,186.87
So, as of 2023-06-01:
- Principal: $71,186.87
- Accrued interest: $0.00
- Total paid to date: $20,000.00
DocketMath will usually show this in a schedule or timeline table, with line items for “Interest paid,” “Principal paid,” and “Remaining balance.”
5. Segment 2: Interest after the payment
Now we compute interest on the reduced principal.
- Start date: 2023-06-01
- End date: 2025-02-01
- Principal: $71,186.87
- Rate: 6% simple
- Day-count: Actual/365
5.1 Count the days
From 2023-06-01 to 2025-02-01 (excluding end date):
Break it down:
- 2023-06-01 to 2024-06-01: 366 days (this span includes Feb 29, 2024 – leap year)
- 2024-06-01 to 2025-02-01:
- June: 30 days
- July: 31
- August: 31
- September: 30
- October: 31
- November: 30
- December: 31
- January (2025): 31
- Total: 30 + 31 + 31 + 30 + 31 + 30 + 31 + 31 = 245
Total days in Segment 2:
- 366 + 245 = 611 days
5.2 Compute interest
[ \text{Interest}_2 = 71{,}186.87 \times 0.06 \times \frac{611}{365} ]
Compute the fraction:
- 611 / 365 ≈ 1.6740
Then:
- 71,186.87 × 0.06 ≈ 4,271.21
- 4,271.21 × 1.6740 ≈ 7,150.70
So, for Segment 2:
- Interest₂ ≈ $7,150.70
6. Total interest and payoff amount
Now combine the segments:
- Interest₁ (before payment): ≈ $6,186.87
- Interest₂ (after payment): ≈ $7,150.70
Total interest accrued over the entire period:
- Total interest ≈ $13,337.57
As of 2025-02-01:
- Remaining principal: $71,186.87
- Accrued interest: $7,150.70
- Total due (principal + interest):
71,186.87 + 7,150.70 = $78,337.57 - Total paid so far: $20,000.00
A simple summary table (mirroring what In DocketMath, this appears as):
| Item |
Sensitivity check
To test sensitivity, change one high-impact input (like the rate, start date, or cap) and rerun the calculation. Compare the outputs side by side so you can see how small input shifts affect the result.
Capture the source for each input so another team member can verify the same result quickly.