Free checklist
Litigation Interest Claim: Supporting Documents Checklist
An interest claim needs three things established: that a sum was owed, when it became due, and which statutory rate governs. Each has its own documentary trail.
12 items across 4 categories. This is a general guide for a typical claim of this type, not an exhaustive or jurisdiction-specific list. Confirm exact evidentiary requirements with counsel before submission.
Why the record matters
Accrual start date is the most contested element. Dated demand letters and a clean payment ledger fix the date; without them the accrual period is argued rather than proven.
The checklist
Underlying Obligation
- Contract with payment terms and interest provision
- Approved payment applications and invoices
- Proof of delivery or completion
Accrual Evidence
- Dated demand letters
- Payment history / ledger
- Notice of claim or lien filings
Liquidated Damages
- Contract LD clause and daily rate
- Substantial completion certificate
- Owner's written LD assessment
Jurisdiction
- Governing law / venue clause
- Current statutory interest rate citation
- Any applicable prompt-payment act
Tick these off as you go
The ClaimDuke calculator carries this same checklist. Tick what you already have and add your own items, and they carry through to the Excel workbook, the Word document and the PDF report you export — so what you hand over shows exactly which records are in the file and which are still outstanding.
Build the calculation and the checklist together
Free to calculate, with a free one-page summary. Paid reports add your branding, a live-formula Excel workbook and the cited methodology behind every line.
Check your state's rules
Evidentiary expectations and the underlying entitlement both vary by jurisdiction. ClaimDuke carries a cited reference for all 50 states covering statutory interest, actual cash value and labor depreciation, delay-claim limits and injury liability.