If you are going to contribute to a Roth, it is better to do it earlier than not, while your earnings are lower, so at least you have that going for you. It can also make it easier if you ever decide to do a backdoor Roth in the future(for you know, when you have tons of money kicking around after you are contributing the max to your 401k and have your mortgage(s) paid off), since it could be hard to open a Roth account after you are over the income limit.