Photo of twenty dollar bills sitting on top of a 1040 form with the text "2015 Solo 401(k) Contribution Deadlines and Mechanics."As 2015 comes to an end, it is critical that Solo 401(k) owners make year-end retirement plans. There are three important deadlines you must know if you have a solo 401(k) or if you plan to set one up still in 2015. A solo 401(k) is a retirement plan for small business owners or self-employed persons who have no other full time employees other than owners and spouses. It’s a great plan that can be self directed into real estate, LLCs, or other alternative investments, and that allows the owner to contribute up to $53,000 per year (far faster than any IRA).

New Solo 401(k) Set-Up Deadline is 12/31/15

First, in order to make 2015 contributions the solo 401(k) must be adopted by your business by December 31, 2015. If you haven’t already adopted a Solo 401(k) plan, you should be starting right now so that documents can be completed and filed in time. If the 401(k) is established on January 1, 2016, or later you cannot make 2015 contributions.

2015 Contributions Can Be Made in 2016

Second, both employee and employer contributions can be made up to the company’s tax return deadline INCLUDING extensions. If you have a sole proprietorship (e.g. single member LLC or schedule C income) or partnership then the tax return deadline is April 15, 2016. If you have an s-corporation or c-corporation, then the tax return deadline is March 15, 2016. Both of these deadlines may be extended 6 months by filing an extension and the date to make 2015 contributions will also be extended. This a huge benefit for those that want to make 2015 contributions but who won’t have funds until later in the year to do so.

W-2’s Force You to Plan Now

Third, while employee and employer contributions may be extended until the company tax return deadline you will typically need to file a W-2 for your wages (e.g. an s-corporation) by January 31, 2016. The W-2 will include your wage income and any deduction for employee retirement plan contributions will be reduced on the W-2 in box 12. As a result, you should make your employee contributions (up to $18,000 for 2015) by January 31, 2016 or you should at least determine the amount you plan to contribute so that you can file an accurate W-2 by January 31, 2016. If you don’t have all or a portion of the funds you plan to contribute available by the time your W-2 is due, you can set the amount you plan to contribute to the 401(k) as an employee contribution and will then need to make said contribution by the tax return deadline (including extensions).

Example

Now let’s bring this all together and take an example to outline how this may work. Let’s take Sally who is a real estate professional and who owns an s-corporation. She is the only owner and only employee and has a solo 401(k) established in 2015. She has $120,000 in net income for the year and will have taken $50,000 of that in wage income that will go on her W-2 for the year. That will leave $70,000 of profit that is taxable to her and that will come through to her personally via a K-1 from the business. Sally has not yet made any 2015 401(k) contributions but plans to do so in order to reduce her taxable income for the year and to build a nest-egg for retirement. If she decided to max-out her 2015 Solo 401(k) contributions, it would look like this.

  1. Employee Contributions – The 2015 maximum employee contribution is $18,000. This is dollar for dollar on wages so you can contribute $18,000 as long as you have made $18,000. Since Sally has $50,000 in wages from her s-corp, she can easily make an $18,000 employee contribution. Let’s say that Sally doesn’t have the $18,000 to contribute but will have it available by the tax return deadline (including extensions). What Sally will need to do is she will let her accountant or payroll company know what she plans to contribute as an employee contribution so that they can properly report the contributions on her payroll and W-2 reporting. By making an $18,000 employee contribution, Sally has reduced her taxable income on her W-2 from $50,000 to $32,000. At even a 20% tax bracket for federal taxes and a 5% tax bracket for state taxes that comes to a tax savings of $4,500.
  1. Employer Contributions – The 2015 maximum employer contribution is 25% of wage compensation for Sally. Since Sally has taken a W-2 wage of $50,000, the company may make an employer contribution of $12,500 (25% of $50,000). This contribution is an expense to the company and is included as employee benefit expense on the s-corporations tax return (form 1120S). In the stated example, Sally would’ve had $70,000 in net profit/income from the company before making the solo 401(k) contribution. After making the employer matching contribution of $12,500 in this example, Sally would then only receive a K-1 and net income/profit from the s-corporation of $57,500. Again, if she were in a 20% federal and a 5% state tax bracket that would create a tax savings of $3,125. This employer contribution would need to be made by March 15, 2016 (the company return deadline) or by September 15, 2016 if the company were to file an extension.
  1. In the end, Sally would have contributed and saved $30,500 for retirement ($18,000 employee contribution, $12,500 employer contribution). And finally, she would have saved $7,625 in federal and state taxes. That’s a win-win.

Keep in mind, you need to start making plans now and you want to begin coordinating with your account or payroll company as your yearly wage information and W-2 are critical in determining what you can contribute to your Solo 401(k).

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