What type of bank account should Solo 401k contributions come from?

For the Solo 401k plan, contributions can be funded from any linked bank account; however, your business or payroll / tax providers may require a certain type of bank account. For instance, C-corps and S-corps may require a separation of business funds from personal funds, which in turn requires a separate business bank account. In these cases, your Solo 401k contributions can be funded from the business bank account.

Employee and employer contributions to your solo 401k can typically come from the same bank account, as long as you properly document the transaction type when making the deposit (indicating whether a deposit is an employer vs. employee contribution, whether it is pre-tax or Roth, etc.) and in your tax filings.

Carry does not verify nor take responsibility for verifying whether deposited contributions come from the correct or appropriate funding source. If you have questions on your individual or business financial situation, you should confirm with your accountant or bookkeeper.

If you're looking for information on how to fund your Solo 401k with a W2 salary payroll provider, check out this article.