The solo 401k contribution deadlines depend on your self-employed business type and business tax return due date. Annual contributions to a solo 401k plan must be made by your business tax return due date plus timely filed extensions. See the following charts for the 2025 and the 2026 solo 401k contribution deadlines. For more information surrounding solo 401k contributions, VISIT HERE.

2025 Annual Solo 401k Contribution Deadlines

2026 Annual Solo 401k Contribution Deadlines

2024 & 2025 Solo 401k Contribution Guides-Deep Dive

Sole Proprietorship, Independent Contractor,  Schedule C, LLC Taxed as Sole Proprietorship, 1099-NEC Independent Contractor

• Slides: Deep Dive 2024 and 2025 Solo 401k Contributions for Sole Proprietor/Schedule C/Contractor/LLC taxed as Sole Proprietorship
• Video: https://www.youtube.com/live/SuI52M1KBio?si=1HWe0netiRchr8ny
• https://www.mysolo401k.net/solo-401k-calculating-solo-401k-contributions-sole-proprietor/

S-corp., C-corp., LLC Taxed as S-corp., W-2

• Slides: S-corporations, C-corporations, LLC taxed as S-corp./C-corp., W2
• Video: https://www.youtube.com/live/nWx-VuzZkwk?si=ol5LnSQTKBtjcjw0

• https://www.mysolo401k.net/corporation-calculating-solo-401k-contributions-corporation/

Partnership, LLC Taxed as Partnership (Form 1065-K)

• Slides: Partnership, Multi-Member LLC (Form 1065 K-1)
• Video: https://youtu.be/Y6hWHTWYDug

• https://www.mysolo401k.net/solo-401k/solo-401k-contribution-partnership-compensation/

2024 & 2025 Mega Backdoor Roth Solo 401k Guides- Deep Dive

Partnerships, LLC taxed as Partnership

• Slides: Partnerships, LLC taxed as Partnership, Form 1065 Schedule K-1
• Video: https://www.youtube.com/live/YuYqqDs_vUM?si=1Mhg4tRFL6oCp4x_

S-corp., C-corp., LLC taxed as S-corp., W-2

• Slides: Mega Backdoor Roth Solo 401k Deep Dive (S-corp., C-corp., LLC taxed as S-corp, W-2)
• Video: https://www.youtube.com/live/RyoF7regcZM?si=FYC3qIMrnOpHVBgm

Sole Proprietorship, Singe Member LLC or 1099-MISC NECT Contractor

• Slides: 2024-2025 Mega Backdoor Roth Solo 401k Contribution Guide (sole proprietorship, single-member LLC or 1099-MISCNEC Independent Contractor)
• Video: https://www.youtube.com/live/-IzyjNYJbWA?si=vI61AJoEUbAHa6nM

Guides 2023 & 2024-How Much Income Do I need to Max Out Solo 401k Contributions?

S-corp., C-corp., LLC taxed as S-corp., W-2

• For Slides, CLICK HERE
• For Video, CLICK HERE

Sole Proprietorship, Singe Member LLC or 1099-MISC NECT Contractor

• For Slides, CLICK HERE
• For Video, CLICK HERE

Partnerships, LLC taxed as Partnership

• For Slides, CLICK HERE
• For Video, CLICK HERE