If you’re in SAP Finance or Accounting, SAP FICO T-Codes are part of your daily workflow — as routine and indispensable as your morning coffee. T-Code stands for Transaction Code, and in SAP’s FI and CO modules, there are SAP FICO T-Codes for practically everything. Posting a vendor invoice, running depreciation, checking a customer balance, pulling up a G/L account — each has its own dedicated code that drops you directly onto the right screen. Type it into the command field and you’re there.