1. Go to Reports and search for 1099. Both the Summary and Transaction Detail versions show up; you don't need to be inside the Prepare 1099s flow to reach either one.
2. Set the date range to the full tax year. 1099 reporting runs on a calendar year, so make sure the range covers January through December, not whatever default period the report opens with.
3. Run the 1099 Summary first. It shows one line per vendor, with the total mapped to the relevant 1099 box (Nonemployee Compensation, rent, and so on), filtered to vendors you've flagged as 1099 vendors.
4. Check which accounts feed which box. The report's settings let you review which expense accounts map to which 1099 category. If a payment's landing in the wrong box, that's usually an account mapping issue, not a problem with the vendor's data.
5. Drop into Transaction Detail for anything that looks off. If a vendor's total looks wrong, this report lists every individual payment behind it, so you can spot a duplicate, a miscategorized transaction, or a payment that should have been excluded.
6. Note who's missing, not just who's listed. A vendor who should hit the $600 threshold but isn't showing up usually means they were never marked as a 1099 vendor, which is worth catching now rather than during the actual filing crunch.