Understanding how 401k contributions impact my AGI - confused about multiple jobs calculation

Thanks for confirming! One follow-up question - will my W-2s from my other jobs (where I didn't make 401k contributions) show a different amount in Box 1 vs Box 5? And does this mean I don't need to do any additional calculations when I file my taxes, since the W-2s will already reflect the reduced income?

For your jobs where you didn't make 401k contributions, Box 1 (wages) and Box 5 (Medicare wages) will typically be closer in amount or the same, with the main differences being any other pre-tax deductions like health insurance premiums. You're correct that you don't need to do additional calculations for the 401k contributions when filing. Your W-2 from the employer where you made the contributions will already show the reduced amount in Box 1. The tax software or forms will use these already-adjusted Box 1 figures from all your W-2s when calculating your total wages and AGI, so the 401k reduction is automatically factored in.

How does this taxr.ai thing work? I've got 3 W-2s this year plus some 1099 work and I'm also confused about how my SEP-IRA contributions affect everything. Does it explain the calculations or just give you the final numbers?

Is it actually accurate? I've tried tax calculators before and they always seem to miss something about my situation. Does it handle state taxes too or just federal?

It's really straightforward - you just upload your tax documents and it analyzes them using AI to explain everything. It breaks down the calculations step by step rather than just giving you final numbers, which helped me understand exactly how my pre-tax contributions affected different parts of my return. For your situation with multiple W-2s and SEP-IRA contributions, it would show you exactly how each income source is reported and how the SEP-IRA contributions create adjustments to income. It helped me understand the difference between above-the-line deductions like retirement contributions versus itemized deductions.

How does this actually work? I thought it was impossible to get through to the IRS without waiting for hours. Do they have some special connection or something?

This sounds like BS honestly. I doubt any service can magically get you through to the IRS faster than the rest of us waiting. They probably just keep auto-dialing until they get lucky, which you could do yourself.

It uses an automated system that continuously calls the IRS and navigates through the phone menu for you until it gets a spot in the queue, then alerts you to join the call. It's not a special connection - it's just technology handling the frustrating busy signals and menu navigation. Yes, theoretically you could do this yourself if you had unlimited time to keep calling back every few minutes for days or weeks, but most people with jobs can't sit around hitting redial constantly. It saved me literally weeks of frustration and allowed me to talk to an actual IRS agent who answered my specific questions.

That's really helpful! So for the W-2 from my job where I made the 401k contributions, I should see a bigger difference between Box 1 and Box 5 compared to my other W-2s, right? Will Box 12 specifically show the amount that went to the 401k with some kind of code?

Yes, exactly! For the job where you made 401k contributions, the difference between Box 1 and Box 5 should be larger than your other W-2s. And you're right about Box 12 - your 401k contributions will be reported there with Code D (for traditional 401k contributions). This lets you verify the exact amount that went to your 401k. If the amount in Box 12 with Code D plus any other pre-tax deductions (like health insurance) roughly equals the difference between Box 5 and Box 1, then you know everything was reported correctly.

I've been doing this for years - contributing to a 401k through my part-time teaching job while my main job doesn't offer one. The only thing to watch for is the annual contribution limit applies across ALL your jobs combined. So track your contributions carefully if you ever change how much you're putting in.

Thanks for the insight! That's good to know about the combined contribution limit. Did you find it affected your tax situation in any unexpected ways compared to if you had contributed through your main job?

Not really any unexpected tax effects - the 401k contribution reduces your AGI the same way regardless of which employer it comes from. The only minor difference I noticed is that it sometimes confuses tax software initially when your largest W-2 (from your main job) doesn't show any retirement contributions, but the software figures it out once you enter all your W-2s. Just make sure you don't accidentally enter the same contribution twice if you're using tax prep software that tries to be "helpful" with estimates.