{"id":31015,"date":"2026-10-16T11:13:35","date_gmt":"2026-10-16T11:13:35","guid":{"rendered":"https:\/\/ark7.com\/blog\/?p=31015"},"modified":"2026-10-16T11:14:40","modified_gmt":"2026-10-16T11:14:40","slug":"online-investing-platforms-solo-401k","status":"publish","type":"post","link":"https:\/\/ark7.com\/blog\/learn\/in-depth\/real-estate-investing\/online-investing-platforms-solo-401k\/","title":{"rendered":"11 Best Online Investing Platforms for Solo 401(k) in 2026"},"content":{"rendered":"\n

The best online investing platforms for a Solo 401(k) in 2026 are Ark7, Fidelity, Charles Schwab, E*TRADE, Vanguard, Betterment, Merrill Edge, Ally Invest, SoFi, Interactive Brokers, and Moomoo, with Ark7 offering self-employed investors a way to add fractional, income-producing real estate to their retirement strategy through a self-directed IRA<\/a>.<\/p>\n\n\n\n

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  1. Fidelity – no-fee Solo 401(k) with broad stock, ETF, and mutual fund access<\/li>\n\n\n\n
  2. Charles Schwab – full-service brokerage with $0 online trades and multiple trading platforms<\/li>\n\n\n\n
  3. E*TRADE – Solo 401(k) with Roth contributions and participant loan availability<\/li>\n\n\n\n
  4. Vanguard – Individual 401(k) primarily focused on Vanguard mutual funds and ETFs, with limited third-party investment access<\/li>\n\n\n\n
  5. Betterment – automated investing platform offering a Solo 401(k) for independent advisors<\/li>\n\n\n\n
  6. Merrill Edge – self-directed, guided, and advisor-assisted investing with a Solo 401(k) option<\/li>\n\n\n\n
  7. Ally Invest – self-directed trading and robo portfolios without a Solo 401(k) offering<\/li>\n\n\n\n
  8. SoFi – banking and investing platform offering IRAs but no 401(k) plans<\/li>\n\n\n\n
  9. Interactive Brokers – multi-asset brokerage with IBKR Lite and Pro pricing tiers<\/li>\n\n\n\n
  10. Moomoo – mobile-first brokerage with options, futures, and stock-screening tools<\/li>\n\n\n\n
  11. Ark7<\/strong> – self-directed IRA option for adding fractional real estate investing<\/a> alongside an existing Solo 401(k)<\/li>\n<\/ol>\n\n\n\n
    Platform<\/th>IRA Custodian Fee Waiver<\/th>Secondary-Market \/ Liquidity<\/th>Distribution Frequency<\/th><\/tr><\/thead>
    Ark7<\/td>Waived for account balances >$100,000<\/td>Secondary-market share sales may be eligible after 12-month hold when market is available; $0 transaction fees; liquidity not guaranteed<\/td>Monthly distributions to account<\/td><\/tr>
    Fidelity<\/td>N\/A ($0 fees)<\/td>Exchange-traded securities; standard brokerage liquidity<\/td>N\/A<\/td><\/tr>
    Charles Schwab<\/td>N\/A ($0 fees)<\/td>Exchange-traded securities; standard brokerage liquidity<\/td>N\/A<\/td><\/tr>
    E*TRADE<\/td>N\/A ($0 fees)<\/td>Exchange-traded securities; standard brokerage liquidity<\/td>N\/A<\/td><\/tr>
    Vanguard<\/td>N\/A<\/td>Standard brokerage liquidity; withdrawal limits may apply<\/td>N\/A<\/td><\/tr>
    Betterment<\/td>N\/A (fee structure differs)<\/td>Automated portfolio; redemption subject to standard ETF liquidity<\/td>Dividend reinvesting (automated)<\/td><\/tr>
    Merrill Edge<\/td>N\/A<\/td>Exchange-traded securities; standard brokerage liquidity<\/td>N\/A<\/td><\/tr>
    Ally Invest<\/td>N\/A ($0 IRA annual fees)<\/td>Exchange-traded securities; standard brokerage liquidity<\/td>N\/A<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Self-employed investors rarely pick just one account. Many pair a low-cost brokerage Solo 401(k) with a separate self-directed IRA for assets a standard plan menu doesn’t offer, and that distinction shapes the rest of this comparison.<\/p>\n\n\n\n

    Why Comparing Solo 401(k) Platforms Is Harder Than It Looks<\/h2>\n\n\n\n

    Choosing where to open a Solo 401(k) sounds simple until you start comparing fee schedules. Some brokerages charge nothing to open or maintain a plan, while specialized administrators charge setup and annual fees that erode small accounts. Investment menus vary from thousands of funds to a single fund family.<\/p>\n\n\n\n

    Loan availability, Roth support, and the ability to hold alternative assets like real estate all differ by provider. Most comparison pages do not separate a brokerage’s general pricing from its Solo 401(k)-specific terms. This guide breaks down the fee structures, investment menus, and retirement-account features of the platforms self-employed workers consider most often in 2026, and shows where a self-directed IRA can fill the gaps a standard Solo 401(k) leaves open.<\/p>\n\n\n\n

    A Solo 401(k) is a retirement plan for self-employed individuals with no full-time employees other than a spouse. Most major brokerage providers charge $0 to open or maintain the plan, though investment menus, loan availability, Roth support, and alternative-asset access vary significantly by platform.<\/p>\n\n\n\n

    Key Takeaways<\/h2>\n\n\n\n