How do I pay past-due balances? July 16, 2019 19:23 Updated Follow Go to https://www.zillow.com/ads/agent-billing-portal/ and select Invoices from the menu to the left. Your past-due invoice details will appear under the Payment Due section. Click on Pay and complete the form to process your payment. Related articles Where can I find my annual statement? How do I make partial payments? Agent Licensing Profile Entry Innovations to Premier Agent How do I turn on my push notifications?