Your employer opted for the new expense category deduction for you. And, no, you were not informed in nearly enough time. However, there is a light at the end of this tunnel for you! If you put together a list of legitimate expenses, itemize by month, and label it as such, this will more than suffice as long as you are within a certain window of expectation of what you are reporting. I have some really great checklists on my personal laptop as many of my clients are firefighters and EMT workers. However, I am sure I can find something real quick for you....
Please note, that since they gave you a 1099-NEC, you now have a Schedule C to fill out. This benefits you as given that what I know you get paid for this definitely is less than what all you spend on boots, clothing, hair cuts, etc. Again, be reasonable and that more than suffices!
Here's one I just found that is a good checklist:
Tax Deductions for Paramedics/EMTs
