(29M)I’m new to investing and I just started a new position with a higher salary. My previous job salary also changed during the year. And I had bonus checks during the year too. So it’s hard for me to know how much I will be making for the whole year since I will have different W2s. Is there a way to confirm that I have met the back door Roth limits ? (138k per year )

Also what will happen if I just contributed to a normal Roth IRA (6500$ limits ) and then turned out that I’m not eligible to it due to my salary being beyond the limits?

And what will happen if I contributed to back door Roth and turns out my salary is below the limits of contribution (138k for this year I believe).

What’s your advice to navigate this situation to make sure that I contribute the maximum to my retirement accounts.

Current TC for the new job that I have just started= 150k

Previous TC = 100k