Say you don't expect to be over but then fall into some income, how do you rectify the Roth account when this happens?
It's a pretty common thing that happens. I use Vanguard so I'm linking their FAQs on it, but you can remove the excess. They will calculate any gains you made on the amount that now becomes taxable. You can move it to an IRA and then backdoor the excess if that is an option also.
Removing excess contributions from your IRA | Vanguard
Learn about excess IRA contributions with Vanguard. Understand how to identify, correct, and avoid penalties to protect your retirement savings.
investor.vanguard.com