Fingers crossed that I will relay my question in a coherent manner. SHORT QUERY: I didn't contribute more than is allowed to my solo 401K for 2017, but I (somewhat accidentally) contributed way more than necessary and took our AGI too low. Can I correct that?
Long background story: I am 56 and had $84K of self-employment (sole proprietor) income in 2017 and established a solo 401K for myself ONLY on 12/28/17. My husband has an S-Corp and I seldom know where his numbers will come in. In 2016 we paid a lot of tax because his income was surprisingly (to me) high in 2016. Thinking it would be the same in 2017, I contributed $3300 to my HSA, $13000 total in to IRAs for both of us, $24,000 EE to my new solo 401K and $15,500 ER to the solo 401K. At the 11th hour of completing our 2017 taxes in September 2018, it became apparent that our AGI was going to be below 0 (!) after a big, unexpected (to me) loss came through from his business to our personal return. For Affordable Care Act /Advanced Premium Tax Credits reasons we REALLY needed our AGI to be at least $13K higher than it was about to come out .
I had already wired the 2 separate (EE/ER) amounts in to my large brokerage plan provider, but I reduced line 28 on our tax return from $39,500 to $26,500. The brokerage's retirement accounts department had told me I could just send them a correction memo (which I did) and designate $13,000 of what I had sent in to be for 2018 rather than 2017. Now that I read a lot of the great information on here, though, I can see that they shouldn't have told me this. I have evidence of the memo I sent them and when, but when I sign in to my account, they still have only the entries for $24,000 EE and $15,500 ER (i.e., they ignored the memo they breezily told me to send them).
What recourse do I have? Our accountant just retired and the lovely person who has taken his place is hard for me to communicate with (couldn't reach him that last week due to holidays). Is there any way to legitimately recategorize/ recharacterize/ reclassify (not sure which is the right term) $13,000 of my solo 401K contributions from 2017? If not, how about those darned IRA contributions I made?
I thank you in advance for any feedback or insight as I hang my head in embarrassment. I realize my spouse and I need to improve our communication and that I am a poster child for the pitfalls of DIY solo 401K plans, big breezy brokerage house plans, etc. :/