January rolls around. You rip into that 2026 W-2 envelope. Something catches your eye - Box 12 changed. Strange pairs of letters sit there: TP, TT. Hold up before reacting. Those markers? They might hide serious money from your taxes. Still, none of it matters unless you grasp their real meaning.   This is how you figure it out. The New Mandatory Reporting From 2026 on, the IRS begins...