Question: are there any tax forms for 401k?
Answer: Nope, you don't need to file your tax return with a form 1099 under those circumstances: you can go right ahead and file how you would file if you didn't have a 401(k). ... A 401(k) plan is a tax-deferred retirement plan. It is pretax which means that you don't pay federal income taxes on the amounts that you contribute.