what your employer did is not proper. the bonus should have been on the w-2 and Medicare and FICA taxes taken out. you are misreporting the income otherwise. you will pay double those taxes this way and may even get the QBI deduction which as employee compensation don't qualify for. if your employer won't comply, you can inform them you'll be contacting the IRS to pursue this matter. and that's what you are supposed to do
https://www.irs.gov/faqs/irs-procedures/w-2-additional-incorrect-lost-non-receipt-omitted/w-2-additi...
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