Hello,

Client (owner and employee of S corp) is looking to contribute $23K to the solo 401K as employee portion by year end. The deductions were not made through payroll and now there will not be enough paychecks for it to be made through payroll. My understanding is they can make the lump-sum contribution regardless. My question is how should this be reported on the tax return. 

Should he adjust the W-2 as if the contribution was made through payroll or do I enter it as a deduction in the personal return?