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Deadlines and extensions to establish and contribute

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When is the deadline to establish a Solo 401k and make contributions to it? And is the deadline affected if I have an extension on my tax filing?

It depends on the tax status of the adopting business of the plan.

  • The tax status determines the tax filing deadline
  • The tax filing deadline is the deadline to establish and contribute to the plan

Note, however, that if you have an extension for your tax filing deadline, this may or may not affect the deadline to establish and contribute to your plan.

Tax StatusFiling DeadlineExtended Deadline
S-Corporation (or LLC taxed as S-Corp)March 15September 15
Partnership (or LLC taxed as a partnership)March 15September 15
C-Corporation (or LLC taxed as C-Corp)April 15October 15
Sole Proprietorship (or LLC taxed as sole prop)April 15October 15
Tax filing deadlines and extensions

Establishment

The SECURE Act allows employers to establish a Solo 401k for the taxable year, after the taxable year is over, if the plan is established by the tax filing deadline for that taxable year.

This may or may not be affected by an extension, depending on the tax status of the adopting business of the Solo 401k:

  • Adopting businesses with tax status of a partnership or corporation can establish a Solo 401k by the business’s tax filing deadline, including extension
  • Adopting businesses with tax status of sole proprietorship can establish a Solo 401k by the business’s tax filing deadline, no extension (April 15)

Employer contribution

  • All adopting businesses can make employer contributions to the Solo 401k by the business’s tax filing deadline, including extension

Employee contribution

  • Adopting businesses with tax status of a partnership can make employee contributions to the Solo 401k by the business’s tax filing deadline, including extension
  • Adopting businesses with tax status of corporation can make employee contributions to the Solo 401k by the end of the taxable year because the employee contributions must be processed through payroll
  • Adopting businesses with tax status of sole proprietorship can make employee contributions to the Solo 401k by the business’s tax filing deadline, no extension (April 15)

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