SYSTEM MAPPING VALIDATION: 1099-OID & 1099-INT Tax Year: 2026 System Module / Feed: Reviewer: Date: 1. SECURITY CLASSIFICATION CHECK [ ] Specified private activity bonds identified in security master. [ ] Tax-exempt OID mapped strictly to 1099-OID Box 11 for private activity bonds. [ ] Tax-exempt stated interest mapped strictly to 1099-INT Boxes 8 and 9 for private activity bonds. [ ] Consolidated logic (OID Box 2) disabled for private activity bonds. 2. PREMIUM AMORTIZATION MAPPING (COVERED SECURITIES) [ ] If interest is mapped to 1099-OID Box 2, bond premium is mapped to 1099-OID Box 10. [ ] If interest is mapped to 1099-INT Box 1, bond premium is mapped to 1099-INT Box 11. [ ] Acquisition premium reporting convention selected (Gross in Box 1 + Amortization in Box 6, OR Net in Box 1). [ ] If Net OID is reported, verify Box 6 is explicitly left blank. 3. DUPLICATE REPORTING AUDIT [ ] Query executed for overlapping CUSIPs with >$0 in OID Box 2 and >$0 in INT Box 1. [ ] Exceptions reviewed for multiple lots/distinct purchase dates. [ ] Subsystem data feeds reconciled to enforce mutual exclusion of stated interest. 4. FURNISHING AND COMPLIANCE [ ] FATCA checkbox logic verified for applicable accounts. [ ] Account numbers populated where multiple forms exist or FATCA is checked. [ ] Recipient TIN truncation applied only to payee substitute statements. [ ] Full TINs preserved for IRS transmission files.