Pre/Post-Offer Damages Split Guide for Colorado

What this calculator does

Run this scenario in DocketMath using the Pre Post Offer Damages calculator.

DocketMath’s Pre/Post-Offer Damages Split calculator helps you separate damages into two time periods based on a Colorado settlement offer date:

• Pre-offer damages: the portion of damages accrued before the offer is made (i.e., before the offer’s filing/serving date, depending on your situation).
• Post-offer damages: the portion of damages accrued on/after the offer date.

This split matters because Colorado law can treat damages differently depending on the procedural posture and whether a statutory offer rule applies.

The core output

When you use the calculator, you’re typically providing:

• total damages (or a damages timeline you can translate into totals)
• the offer date
• your allocation approach (for example, straight-line accrual vs. custom milestones)

The calculator then outputs:

• Pre-offer amount
• Post-offer amount
• Total (reconstructed) damages
• (Often) a check that pre + post equals your supplied total, or a warning if it doesn’t.

Why “split timing” can affect case value

Even when the underlying damages are the same in theory, Colorado offer rules can shift which damages are recoverable as of certain dates, and they can affect incentives to settle. A clean pre/post split lets you:

• build consistent settlement numbers,
• estimate exposure for the “after the offer” period,
• and generate a defensible damages timeline for mediation or motion practice.

When to use it

Use DocketMath’s pre/post-offer damages split when you have a damages number that grows over time and you’re evaluating the impact of an offer date.

Use cases (practical checklist)

Consider using the calculator if you have any of the following:

• Damages accrue over time

  • wage loss, medical bills with ongoing treatment, loss of use, ongoing property damage, or continuing damages
• A known offer date exists

  • you can identify the date the offer was served/filed
• You can map damages to time

  • you have monthly payments, invoices by date, treatment dates, or a damages formula with a time component
• You’re evaluating settlement economics

  • you want to compare settlement offers to a likely post-offer exposure curve

Offer-date sensitivity

The split is only as good as your offer date inputs and your damages accrual assumption. If your accrual is front-loaded (e.g., big early medical bills), the split will look different than if accrual is evenly spread.

Quick “do I have enough info?” test

Before calculating, confirm you can answer these:

If you check “no” to the first two, a split calculator may still help, but you’ll likely need a different approach for non-time-based damages.

Step-by-step example

Below is a realistic walkthrough using a simple, time-based damages scenario for Colorado. Even if your facts differ, the mechanics will match what the calculator is designed to do.

Scenario: continuing medical and wage-loss damages

Assume:

• Offer served on March 15, 2024
• Damages accrue from January 1, 2024 through December 31, 2024
• You estimate damages total as $120,000
• You can approximate accrual evenly by time (straight-line monthly accrual)

We’ll split the $120,000 into:

• Pre-offer: from Jan 1, 2024 through Mar 14, 2024
• Post-offer: from Mar 15, 2024 through Dec 31, 2024

Step 1: Identify the time window

• Start of accrual: Jan 1, 2024
• Offer date: Mar 15, 2024
• End of accrual: Dec 31, 2024

Total accrual period length (by days):

• Jan 1–Dec 31 inclusive is 366 days in 2024 (leap year).

Step 2: Compute pre vs. post day counts

• Pre-offer period: Jan 1–Mar 14

  • Jan (31) + Feb (29) + Mar (14) = 74 days
• Post-offer period: Mar 15–Dec 31

  • Remaining days: 366 − 74 = 292 days

Step 3: Allocate the total damages by time

If accrual is evenly distributed:

• Pre-offer share = 74 / 366 ≈ 20.22%
• Post-offer share = 292 / 366 ≈ 79.78%

Apply to total damages of $120,000:

• Pre-offer damages: $120,000 × 0.2022 ≈ $24,264
• Post-offer damages: $120,000 × 0.7978 ≈ $95,736

Step 4: Validate the split

• Pre ($24,264) + Post ($95,736) = $120,000 (allowing for rounding)

Now plug into DocketMath

In the DocketMath calculator workflow:

• Enter offer date: 03/15/2024
• Enter damages period start/end: 01/01/2024 to 12/31/2024
• Enter total damages: 120,000
• Select/confirm the accrual method:

  • Time-proportional (straight-line) in this example

Then review outputs:

• Pre-offer amount
• Post-offer amount
• Any rounding notes or consistency checks

Common scenarios

Not every case accrues like a straight line. Below are several patterns you’ll see in Colorado practice (and in settlement valuation work), along with how the split typically works.

1) Medical bills with known invoice dates

Pattern: You have itemized treatment bills with exact dates. Total damages are the sum of those bills.

Best split method:

• Sort bills by date
• Sum bills before the offer date → pre-offer
• Sum bills on/after offer date → post-offer

Checklist:

Result shape: often lumpy—pre may capture a concentrated early treatment burst.

2) Wage loss that ramps up and then stops

Pattern: Lost wages start after an injury, stabilize, then end when the person returns to work.

Best split method:

• Use the pay-loss dates (or pay periods)
• Sum by time before/after offer

If you only have monthly totals:

• Allocate monthly totals to months that fall before and after the offer date.
• If the offer date is mid-month and your monthly figure is assumed average, the calculator’s proportional method can approximate.

3) Property damage with repair timeline milestones

Pattern: Costs occur in phases:

• initial mitigation
• contractor labor
• replacement materials
• restoration completion

Best split method:

• Treat each milestone cost as happening on its completion date (or bill date if more accurate).
• Allocate milestone costs based on whether the date falls before or after the offer date.

Why this matters: A straight-line accrual can distort the exposure if big costs occur late in the project.

4) Loss of use or continuing damages (daily rate)

Pattern: Damages run at a daily/weekly rate (e.g., rental-equivalent damages, delay damages).

Best split method:

• Multiply the daily rate by:

  • number of days pre-offer
  • number of days post-offer

Result shape: smooth split if the daily rate is constant; otherwise use piecewise rates.

5) Mixed damages (lump sum + time-based)

Pattern: You have a one-time category (e.g., a completed expense) plus ongoing damages.

Best split method:

• Split only the time-based portion.
• Add the lump-sum category to pre or post based on its occurrence date.

Tips for accuracy

The split is only as accurate as your assumptions and date boundaries. The following practices improve accuracy and defensibility.

1) Lock down the offer date rule

Decide and document internally:

• Does “post-offer” include the offer date itself?
• Are you using the service date, filing date, or another date shown on the offer record?

DocketMath will calculate based on the offer date you provide. Consistency beats perfection.

2) Use the same accrual boundary everywhere

If your damages timeline uses:

• month-level figures (e.g., total medical bills by month), then compute pre/post using month boundaries, or use proportional allocation within the partial month—just don’t mix methods.

3) Prefer actual dates over averages when available

If you have:

• invoice dates,
• treatment dates,
• pay-period dates,
• inspection/repair completion dates,

sum from actual dates instead of estimating with averages.

4) Build a quick audit table

Use a simple table to verify the split before relying on outputs:

| Item / period | Date range | Estimated /

Sources and references

Start with the primary authority for Colorado and confirm the effective date before relying on any output. If the rule has been amended, update the inputs and rerun the calculation.

• Primary authority reference

Related reading

• Pre/Post-Offer Damages Split Guide for Alabama
• Pre/Post-Offer Damages Split Guide for Arizona
• Pre/Post-Offer Damages Split Guide for California