"If you don’t withhold upfront, you’ll likely need to send quarterly estimated tax payments to the IRS to avoid a big tax bill next spring. TurboTax has a W-4 withholding calculator that may be useful in helping you calculate your estimated payment, or you can opt to work with an accountant."
Form W-4V (Voluntary Withholding Request)
https://www.irs.gov/pub/irs-pdf/fw4v.pdf
실업 수당의 10%를 원천징수하도록 선택할 수 있으며 . . .
Form 1040-ES to figure and pay your estimated tax for 2021.
https://www.irs.gov/pub/irs-pdf/f1040es.pdf
CPA/EA와 상담하시기 권합니다.