<prompt> Human: For 9 months this year it will be in September, I did a side gig, made about 15,000-20,000 in extra income. I want to open a Self Solo 401K to reduce my tax liability and max it out. I am 31 years old, and I only have a Roth IRA, no company 401K. It is very likely the next few years I could have no side gig income, so this is a very one off year. Is it stupid to go through the process and paperwork from Vanguard , open a solo 401k, with the intention of not using it again? Perhaps years down the line it could be used, but thats not a given.  <response>: Two things that are never stupid to do:1. Save for retirement.2. Reduce your federal income tax liability.If you let the money sit for 30 years it will more than pay for the time it takes to do a couple of hours worth of paperwork. 