Tax scammers pretending to be IRS officials call and say you owe taxes, and threaten to arrest you. Don't let them trick you into sending money over phone.
Scammers sometimes pretend to be government officials to get you to send them money. They might promise lottery winnings if you pay “taxes” or other fees, or they might threaten you with arrest or a lawsuit if you don’t pay a supposed debt. Regardless of their tactics, their goal is the same: to get you to send them money.
Don’t do it. Federal government agencies and federal employees don’t ask people to send money for prizes or unpaid loans. Nor are they permitted to ask you to wire money or add money to a prepaid debit card to pay for anything.
Source: Consumer Affairs Website