The Republicans, now in charge of House, Senate, and Presidency, succeeded in putting through a pretty decent tax cut right before Christmas. This tax cut will affect all Americans as of pretty much right now, January or February of 2018. If you want a summary of all the changes, this page lists them succinctly.
The tax cuts are actually pretty significant. The right-wing is celebrating, and the left-wing is screaming that they mostly benefit the rich and corporations, which for the most part is true. Not that it should bother you.