I think the government will be reforming taxation for us, since--tinfoil hat time--in the future, they could make taxation "voluntary", but if you don't pay (spend your FEDcoin on it), they will take away your access to society. For instance, if you don't pay the road tax to drive on the roads and the carbon tax for the electricity in the car you and the other people in your pod share, "your" car won't stop when you put your key in and you'll probably have your food rations slashed (because the Tesla Cybertrucks need to use the road too). If you don't pay the healthcare tax, you won't be allowed to buy medicine or see a doctor.
Not paying some taxes will mean you will starve, like if you don't pay the environment tax, you are banned from buying food or receiving free water, because that means you aren't helping offset carbon with the bugsteaks and soy you're eating. I could see a "social justice tax" existing too to help "marginalized people", and not paying that means you have to pay more on all your other taxes or maybe even go straight to not-prison (an even smaller pod for wrongthinkers).
All of this will be enforced by a digital ID you will show which includes everything about you on it (i.e. name, vaccination status, etc.).
This will be done because it makes more sense than current taxation when most of the money will just go to UBI and it goes along with some of the WEF's goals in terms of "flexibility." It also gives everyone a "choice" in paying taxes (people love having choices after all) and fools people into thinking their tax money is being directed to something useful. I don't know if the government will ever do this but all it really takes is one "intellectual" billionaire hanging out with the WEF and Bilderberg and it becomes "sound policy" just like when Blackrock's Larry Fink helped create ESG social credit scores.