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ShareBuilder 401k announced that from January 12 through February 4, the company is waiving all setup costs for its Solo 401(k) plans, allowing self-employed business owners to save up to $150 immediately upon opening a new account.
Any owner-only business starting their first 401(k) plan can still make contributions that qualify for 2025 taxes until their business tax deadline. As the owner is both the employer and employee in a Solo 401(k) plan, a self-employed person can make contributions of up to $70,000 (depending on your earnings) in the 401(k) for the 2025 tax year until businesses tax deadlines (April 16, 2026, for single-member LLCs and sole proprietors). Depending on entity types, employee contributions can be made too. This allows solopreneurs to open a plan during this January and February promotion and retroactively lower their 2025 taxable income.
Solo 401(k) financial benefits for 2026 are even larger. For the 2026 tax year, the total Solo 401(k) contribution limit (combining employee and employer roles) has increased to $72,000. For those aged 50–59, the limit rises to $80,000, and, thanks to recent legislation, individuals aged 60-63 have a cap of $83,250.