How to calculate pre/post-offer damages split in New York

Quick takeaways

• In New York, DocketMath’s pre-post-offer-damages calculator is designed to separate your damages into pre-offer vs. post-offer components using New York’s CPLR offer framework in N.Y. CPLR § 5001.
• DocketMath then adds any requested interest using the New York interest provisions in N.Y. CPLR § 5004 (configured in this guide to 9% from the verified rules packet).
• The damages split and the interest timing are two different steps—interest rules affect how much extra accrues, but they do not replace the need for a defensible pre vs. post principal allocation.
• If you don’t provide a clear pre/post allocation basis (not just a single total), your split can be internally consistent yet practically unreliable.

Inputs you need

To calculate a pre/post-offer damages split in New York using DocketMath, collect inputs in three buckets: (1) offer timing, (2) underlying damages, and (3) interest/judgment timing inputs.

A. Offer and timeline inputs (timing controls the split)

• Offer date (the date your offer was made)
• Cutoff logic you’ll apply for “pre” vs. “post” damages (DocketMath typically uses your selected “before offer” vs. “after offer” structure—mirror your damages methodology consistently)
• Verdict/judgment-related dates (only if you want interest added by the calculator)

B. Underlying damages inputs (the split math)

You have two common ways to proceed:

1. You already have pre and post principal numbers

   • Pre-offer damages amount
   • Post-offer damages amount

2. You only have total damages

   • Total principal damages
   • A defensible way to separate total damages into pre vs. post (for example, a dated breakdown of line items you can sum into pre and post buckets)

C. Interest and related rules inputs (feeds totals after the split)

From the verified rules packet, the calculator’s New York interest settings for this workflow use:

• Interest rate used by the calculator: 9% under N.Y. CPLR § 5004
• Whether you’re computing:

  • interest from verdict to judgment, and/or
  • post-judgment interest
• The relevant timing interval(s) (so the tool applies the correct window)

Practical tip: If your goal is principal-only reporting, keep interest fields off (or leave them blank, depending on how the calculator is set up). If your goal is all-in totals, include the dates the tool asks for.

DocketMath link

Start at: /tools/pre-post-offer-damages

How the calculation works

DocketMath’s pre-post-offer-damages method works as a two-layer workflow:

1. Allocate principal damages into pre-offer and post-offer buckets.
2. Add interest (optional) using New York’s interest rule settings configured in the tool based on N.Y. CPLR § 5004.

1) Split the principal damages into two buckets

Create two numbers that represent the principal amount attributable to each period:

Then ensure your arithmetic ties out:

• Total principal damages = Pre-offer + Post-offer

If you start with a single total, DocketMath can’t infer your “pre vs. post” allocation from a total alone—you need a basis to construct those two inputs.

2) Connect the split to New York’s offer framework

New York’s offer framework is anchored in N.Y. CPLR § 5001. For calculation purposes in DocketMath, the operational effect you’re modeling is that the damages you seek to recover are separated into pre-offer vs. post-offer periods relative to the offer timing.

So your output isn’t only “what is my damages total?”—it’s “what portion of damages falls into each time period?”

3) Add interest using the New York rate rule (optional)

If you elect to calculate interest, the verified rules packet indicates the tool uses:

• 9% interest configured under N.Y. CPLR § 5004

In practical terms, interest-related outputs depend on which interest options you enable and which dates you provide:

• Verdict-to-judgment interest (if selected): interest accrues across the relevant window between those dates.
• Post-judgment interest (if selected): interest accrues after judgment on the relevant basis and window.

Important workflow caution

Do not treat the interest rate as a substitute for the principal split:

• The split decides which principal amount belongs to pre vs. post.
• The interest rule (9%) decides how much extra accrues on the selected time windows (as configured in N.Y. CPLR § 5004).

Practical workflow in DocketMath

Use this order:

1. Enter offer date (and follow the calculator’s prompt for cutoff logic, if any)
2. Enter pre-offer principal and post-offer principal
3. If you want interest:

   • enter verdict date and judgment date (for verdict → judgment interest, if enabled)
   • enter any post-judgment dates needed (for post-judgment interest, if enabled)
4. Confirm the calculator is using the New York interest settings configured for 9% under N.Y. CPLR § 5004
5. Review the outputs and validate your arithmetic (pre + post)

4) Output interpretation: what you should expect

Typical outputs include:

• Pre-offer principal
• Post-offer principal
• Total principal
• Any computed interest components (only if you selected/entered the required interest inputs)
• Combined totals (principal plus interest, depending on your settings)

Sanity checks you can run immediately after calculating:

• If Pre + Post ≠ Total principal, revisit your pre/post inputs.
• If interest looks unusually high or low, re-check date consistency (verdict/judgment vs. post-judgment windows) and ensure the dates are entered in the right order.

Common pitfalls

• Date mixing

  • The offer date/cutoff drives the pre vs. post principal split.
  • Verdict/judgment dates drive interest timing under N.Y. CPLR § 5004 (when interest is enabled).

• No legitimate basis for splitting damages

  • If your damages aren’t naturally separated, you still need a defensible allocation method to create pre-offer vs. post-offer inputs.
  • Without that, the calculator can produce numbers, but the split may not reflect your case facts.

• Entering totals without reconstructing pre vs. post

  • If you only have a single total damages number, you still need to construct pre-offer and post-offer principal amounts (either from a dated schedule or other consistent breakdown).

• Expecting interest to “fix” a split problem

  • Interest rules increase totals; they do not correct a wrong pre/post allocation.
  • Treat pre/post principal allocation and interest calculation as separate steps.

• Inconsistent chronology

  • If you enter an offer date that doesn’t align with your damages theory or the verdict/judgment timeline, you can end up with unintuitive splits.

Sources and references

• N.Y. CPLR § 5001 — https://www.nysenate.gov/legislation/laws/CVP/5001
• N.Y. CPLR § 5004 — https://www.nysenate.gov/legislation/laws/CVP/5004
• N.Y. CPLR § 5002 — https://www.nysenate.gov/legislation/laws/CVP/5002
• N.Y. CPLR § 3221 — https://www.nysenate.gov/legislation/laws/CVP/3221

Next steps

1. Open DocketMath at: /tools/pre-post-offer-damages
2. Enter:

   • Offer date
   • Pre-offer principal damages
   • Post-offer principal damages
3. Decide whether to include interest:

   • If yes, provide the relevant verdict/judgment and any post-judgment dates requested by the tool so it applies N.Y. CPLR § 5004 settings (9% as configured by the verified rules packet).
4. Validate your results:

   • Confirm Pre + Post = Total principal
   • Check interest time windows match the chronology you intend to model
5. Save/export your split summary for internal review against your damages breakdown.

Related reading

• How to calculate pre/post-offer damages split in California — Full how-to guide with jurisdiction-specific rules
• How to calculate pre/post-offer damages split in Florida — Full how-to guide with jurisdiction-specific rules
• How to calculate pre/post-offer damages split in Texas — Full how-to guide with jurisdiction-specific rules