Appeals2 minUpdated 2026-05-28

Penalty & interest on late payments

Self-executing — the payer owes it automatically

Under Labor Code §4603.2/§4622, California WC penalty and interest are self-executing: a payer that pays late owes them by operation of law, no request required. Medical-legal bills: 10% penalty + 7% simple interest after the 60-day EOR deadline. Treatment e-bills: 15% penalty + 10% interest after 45 days (private payer) or 60 days (governmental). Interest accrues from the date the payer received the bill — not from the deadline.

Compute what you're owed

Open /wizard/penalty-interest, pick the bill type, enter the unpaid amount and the received/paid dates. The calculator flags whether the deadline was breached and totals unpaid + penalty + interest. Use that figure when you build the Second Review or audit complaint so the late-payment penalty and interest are part of what you demand — they're owed by operation of law, so don't leave that money on the table.

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