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The Daily Insight

Where do solo 401k contributions go on 1040?

Author

Henry Morales

Published Mar 03, 2026

Sole proprietors and partners deduct Solo 401k contributions for themselves on line 28 of Form 1040, U.S. Individual Income Tax Return.

What are the reporting requirements for a solo 401k?

A one-participant 401(k) plan is generally required to file an annual report on Form 5500-EZ if it has $250,000 or more in assets at the end of the year. A one-participant plan with fewer assets may be exempt from the annual filing requirement.

Can I administer my own Solo 401k?

With the Solo 401k plan by Nabers Group, you do not need a third party administrator. In fact, you are allowed to act as your own administrator. Read on to learn about the roles and duties of a 401k plan administrator and how you can make it work for your retirement plan.

Do you have to contribute to a Solo 401k?

The total contribution to your Solo 401k plan will be the aggregate of your salary deferral and profit-sharing contribution. You must make the Solo 401k contributions for your sole proprietorship by the time you file your business tax return.

How much can you contribute to a sole proprietorship 401k?

Use our helpful contribution calculator to determine your Solo 401k contribution for your sole proprietorship. The maximum employee salary deferral contribution can be up to 100% of your net compensation, maxing out at $19,000 (or $25,000 if you are age 50 or older).

Do you have to file annual report for one participant 401k plan?

A one-participant 401 (k) plan is generally required to file an annual report on Form 5500-SF if it has $250,000 or more in assets at the end of the year. A one-participant plan with fewer assets may be exempt from the annual filing requirement.

When to withdraw excess money from Solo 401k?

If at all possible, you want to withdraw the excess amount from your Solo 401k before the end of the tax year (Dec. 31). If that is not possible, your next choice is withdrawing it before tax day (July 15, 2020 for 2019 tax returns).