2018: The maximum Solo 401k contribution for tax year 2018 is $55,000 plus $6,000 if you are 50 or older in 2018.
2019: The maximum Solo 401k contribution for tax year 2019 is $56,000 plus $6,000 if you are 50 or older in 2019.
A partnership makes annual contributions to a partner’s Solo 401k account based on her net earned income (line 14 Code A of Schedule K-1 (Form 1065)).
Net earnings from self-employment
Start with self-employment income and then subtract the following:
Half of her self-employment tax
Refer to Publication 560 for tables and worksheets to assist you in calculating the deduction for contributions to a solo 401k plan for a partner. You may also visit solo 401k contribution calculator.
Partner’s earned income
As defined in Code 1402 and 401(c) (2), a partner’s earned income is the income she receives for her services to materially help produce that income. A partner is required to separately calculate her earned income for each trade or business.
Not every partner may have earned income (for example, a limited partner who does not provide services to the partnership and is merely an investor). Also, all of a partner’s income from the partnership may not be earned income (for example, investment income that is passed through the partnership to the partners).
Reporting a partner’s earned income
Each partner’s earned income or loss is listed on Schedule K-1 (Form 1065), Partner’s Share of Income, Deductions, Credits, etc. The partnership must give a Schedule K-1 to each partner by the filing date (including extensions) of the partnership’s Form 1065, U.S Return of Partnership Income (instructions).
Solo 401k Contribution Deadline for a Partnership or LLC Taxed as a Partnership
- If the entity type is a Partnership (calendar year), the annual solo 401k contribution deadline is March 15, or September 15 if tax return extension is filed.
- If the entity type is an LLC taxed as a Partnership (calendar year), the annual solo 401k contribution deadline is March 15, or September 15 if tax return extension is filed.
For a Partnership or LLC Taxed as Partnership Where do I Report Contributions Made to a Solo 401k Plan?
- Contributions made based on your Schedule K-1 (Form 1065) income should also be reported on line 28 of Form 1040 as well as line 14 of your K-1 (Code R)
- See the below publications for reference regarding where to report contributions:
- See pg. 15 ” Where To Deduct Contributions” https://www.irs.gov/pub/irs–pd
- See Page 2 of K-1, Code R (Pensions and IRA’s) Under Line 14 instructions https://www.irs.gov/pub/irs–pd
- See Page 11, Definition of Pensions and IRA’s under Code R, which includes a qualified plan such as a solo 401khttps://www.irs.gov/pub/irs–pd
Taking on a Partner QUESTION:
Should my partnership take on another business partner (>2% ownership) what is the process to amend the solo 401k trust to include the new partner?
Since a Solo 401(k) plan is for owner-only employee businesses, as long as the partner meets this requirement, he or she could also participate in the existing Solo 401(k) plan. He or she would have her own participant account under the plan.
Publication 541, Partnerships
Publication 560, Retirement Plans for Small Business (SEP, SIMPLE and Qualified Plans)