Palmer
February 2, 2025, 4:31am
1
I contribute to my after-tax Solo 401K every year and then roll those funds into my Roth Solo 401K (Mega Backdoor Roth).
I’m unsure how to report these contributions on Form 1099-R and other tax forms.
Since the contributions aren’t deductible, there’s no tax impact, but I want to make sure I report them correctly.
Any guidance?
Hayley
February 2, 2025, 4:31am
2
Are you asking about removing an excess contribution or just rolling after-tax funds into Roth?
Palmer
February 2, 2025, 4:31am
3
Hayley said :
Are you asking about removing an excess contribution or just rolling after-tax funds into Roth?
For 2024, there was a small excess contribution to the after-tax account. I refunded it to myself before rolling the rest into my Roth Solo 401K.
Hayley
February 2, 2025, 4:31am
4
@Palmer
For the excess contribution refund, Box 1 of Form 1099-R should show the total distribution amount. Box 2a should reflect any gains included in that amount, which are taxable. Box 7 would likely need code 8 (excess contribution refund).