So I checked out how Koukin F-REGI lets people pay taxes with credit cards in Japan, and it's honestly kinda useful if you don't like hassle. You basically need two things: your tax paperwork (like from your tax return or the stuff the tax office sends you) and a credit card. The site walks you through paying different kinds of taxes—like income, consumption, corporate, inheritance, even gift taxes, which seems like a ton.

There's a fee every time though, and it goes up the more you pay, like 99 yen for 10,000 yen paid, 198 yen for 20,000, and so on. It's not free, but it beats standing in line. If you have a really specific tax like withholding without a notice, you actually have to go through e-Tax, not this system.

From what I’ve heard, people like that it’s super quick and you can pay off your taxes even if you’re forgetful like me. But you don't want to forget about the extra fee—some people get salty about paying to pay taxes, which I totally get. If you want to see if your tax is included, the website has the full breakdown.