Yes, cash is still very much in use in the US. And you can pay the IRS in cash, at least for amounts less than $1000. But checks are also in use here. I’ve bought a few cars with cashier’s checks and nobody has given me a hassle about it.

However, there are certain venues now that will not accept cash at all. Theme parks, stadiums, concerts: they are mostly places where places to spend money are spread out, and the burden of physically handling the cash is a lot. I have seen theme parks with kiosks at the entrance to convert people’s cash into VISA debit card accounts just to facilitate this. I guess they think it makes it all more efficient.

I will say that while I still carry around cash, after the pandemic I refuse to carry around loose change. Why would I? I will never need to use a pay phone anymore, and most parking meters can be topped up from your phone. Anytime I buy something in cash and get change, I usually just out it in the tip jar, because there is no more room in that jar on the dresser.