Republicans hold the slimmest of majorities in the House. The final count was 220 to 215, but keep in mind, three of those 220 are gone, having been picked by trump for his administration (Elise Stefanik, Matt Gaetz and Lori Chavez-DeRemer), and while they'll probably be replaced by other Republicans, that's still a way's off.
To make a long story short, whatever Mike Johnson puts forward (assuming he's still the speaker), in the near term he has a 217 - 215 split. He can't afford to lose a single vote. Even with a full count, he couldn't afford to lose 3. No caucus is that cohesive. There's also the matter of attendance. There are always members out sick, or dying... or being arrested... On paper they have the whole thing, but expect some wrangling and gridlock.
Of course, to speak to your point, they generally all agree on tax cuts. So we'll see. End of next summer maybe?
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