IRS Deduction of Overtime
There are ongoing questions about the deductibility of your overtime, and DFAS has just made it more complicated. Apparently, recent LES remarks have indicated that only unscheduled overtime is eligible for a deduction, but there is disagreement. These 2 articles cover the IRS guidance concerning overtime deductibility for Federal Firefighters.
IRS Issues New Guidance on Federal Firefighter Overtime Deduction | Stellar WM
DFAS Got It Wrong: Why Federal Firefighters Are Owed More Than MyPay Shows | Stellar WM
To be clear, only the premium portion of your overtime (0.5) is tax deductible, not the straight time portion. However, according to these 2 articles, you should get credit for your OT-in-Tour. If this situation is not resolved at the agency level, you may need assistance at the congressional level.