"When is my payment due?" Payment is due on the 10th day of the billing month. Your payment must be received in the office by the 25th of the month to avoid a late charge. Balances after the 25th are delinquent and will incur a 10% penalty. Go to Billing Procedures to read the full billing policy or call the office at 253-841-9698 if you have any questions about your billing cycle or current balance.