Buying toner is a specialized purchase critical for printing checks that meet banking standards. Because banking machines use magnetic readers to process the routing and account numbers, using standard toner can result in rejected checks and bank fees. 1. Identify Your Specific Needs

Expect to pay for MICR toner compared to standard laser toner. What is a MICR toner cartridge? - LD Products

: MICR toner is required by the ABA and ANSI for printing the magnetic line on the bottom of checks.