Sage 100 How To Write Off Bad Debt in Accounts Receivable Sage 100 (MAS 90 / MAS 200) – How To Write Off Bad Debt in Accounts Receivable .Learn how to write off bad debt in Accounts Receivable, and verify the write off in Customer Maintenance. More Information Sage 100 Add-Ons / Enhancements Sage 100 Modules Sage 100 Support Sage 100 Watch Videos