Late fees calculated from due date

To calculate late fees from the invoice due date instead of the invoice date, go to Settings > Billing & Invoices > Accounts Receivable and, under Late Fees, set Calculation Basis to Due Date. CORE calculates late fees from the invoice due date, which is the invoice date plus the payment term's net days, and then adds any days specified in Charge Interest After. If Calculation Basis is set to Invoice Date, CORE calculates late fees from the invoice date regardless of the payment term. You can also set this at the client or project level. Check CORE Help Center for details.