1. Check the total. Your Accounts Payable balance lives on the Chart of Accounts under Bookkeeping, and shows up as a line on your Balance Sheet, the mirror image of how Accounts Receivable shows up there.
2. Run the A/P Aging report for the breakdown. Under Reports, search for Accounts Payable Aging Summary. It splits what you owe into current, 1-30 days, 31-60, 61-90, and 90-plus, by vendor.
3. Switch to the Detail version for the actual bills. Accounts Payable Aging Detail lists the specific bills behind each bucket, not just a vendor total, so you know exactly what's due and when.
4. Check a single vendor's open balance directly. Open Expenses, then Vendors, and each row shows what you currently owe that vendor without running a report.