The Invoice Late Fee Calculator estimates a late-fee amount and updated invoice balance from principal, rate, and overdue time assumptions.
Use a rate and period convention that matches the contract, such as annual rate with days divided by 365.
Questions
Is a late fee automatically enforceable?
No. Contract terms, local law, notice requirements, and customer type can limit late-fee collection.
Does this calculate compound late fees?
Only if the component exposes and applies that setting. Do not assume compounding when the contract specifies simple interest.
Does it include tax?
No. It models the fee and balance only.
Limitations
Verify the invoice agreement, maximum legal rate, grace period, and payment date before charging a fee.