Introduction:

For the modern entrepreneur, the “standard” retirement advice often feels like a suit tailored for someone else. You aren’t just a W-2 employee; you are a builder, a risk-taker, and a high-earner.

When it comes to choosing a Solo 401(k) provider in 2026, the choice usually narrows down to two titans: the industry giant, Fidelity, and the sleek disruptor, Carry.

One offers the comfort of a household name, while the other offers a high-performance engine for tax optimization.

For most investors, Fidelity is the superior choice due to its $0 account fees, extensive 24/7 customer support, and “all-in-one” ecosystem that covers everything from checking accounts to complex retirement plans.

On the other side, Carry is a specialized fintech platform better suited for high-earning entrepreneurs who need advanced tax strategies like the Mega Backdoor Roth or want to invest in alternative assets like private equity and real estate.

Core Comparison Fidelity (2026) vs Carry (2026)

Here is how to decide which belongs in your corner.

The Case for Fidelity: The “Safe Bet” Stability

Fidelity is the gold standard for the “set it and forget it” investor. If your goal is to buy a few Vanguard ETFs or Blue Chip stocks and let them sit for thirty years, Fidelity is hard to beat.

• The Price Point: You can’t beat “free.” Fidelity’s Solo 401(k) has no setup fees and no annual maintenance fees.
• The Ecosystem: If you already have your personal brokerage, your kids’ 529 plans, and a checking account with Fidelity, keeping your retirement there offers a seamless “one-login” life.
• The Human Touch: In 2026, human support is a luxury. Fidelity still maintains physical branches and 24/7 phone support for when you need a real person to walk you through a rollover.

The Verdict: Choose Fidelity if you want a simple, low-cost way to invest in the stock market and value a 75-year-old reputation.

The Case for Carry: The Entrepreneur’s “Secret Weapon”

If Fidelity is a reliable sedan, Carry is a customized racing machine. Carry was built specifically for high-earning business owners who find traditional brokerages too restrictive.

• The Mega Backdoor Roth: This is Carry’s “killer feature.” While Fidelity limits you to standard contribution ceilings, Carry’s documents are designed to support the Mega Backdoor Roth. This allows some owners to stash up to $70,000+ per year into a tax-free Roth account—a move that can lead to millions more in tax-free wealth over a career.
• Beyond the Stock Market: Tired of the S&P 500? Carry allows you to use your retirement funds to invest in private equity, real estate, and startups. It gives you the “Checkbook Control” that big-box brokers typically block.
• The 2026 Tech Stack: Carry isn’t just a vault for your money; it’s a tax strategist. Its dashboard automates your contribution tracking and compliance paperwork, ensuring you never miss a deadline or over-contribute.

The Verdict: Choose Carry if you earn over $150k, want to maximize your tax alpha, or want to invest in assets that Fidelity won’t let you touch.

Key Considerations for 2026

1. Retirement Strategy (Solo 401k)

• Fidelity: Offers a robust, free Solo 401k that now supports Roth employee deferrals as of 2026. However, it does not support advanced maneuvers like after-tax contributions or the Mega Backdoor Roth.
• Carry: Specifically built for complex strategies. It allows users to maximize contributions through the Mega Backdoor Roth and provides the legal paperwork to take Solo 401k loans, which Fidelity currently does not allow.

2. Investment Flexibility

• Fidelity: Provides access to thousands of traditional assets and limited crypto (Bitcoin, Ethereum, Litecoin). It is widely praised for its Fidelity ZERO funds, which have no expense ratios.
• Carry: Acts as a self-directed platform. While you can trade standard stocks and ETFs, the “Pro” plans allow you to invest retirement funds directly into alternative assets like private startups and real estate.

3. Cash & Banking

• Fidelity: Functions as a near-complete bank replacement with its Cash Management Account (CMA), offering global ATM fee reimbursements and a 3.34% 7-day yield on uninvested cash (as of January 2026).
• Carry: Focuses on tax optimization. Its Smart Yield tool helps professionals optimize for tax-equivalent yields, though it carries a 0.20% advisory fee.

The bottom line

Fidelity wins for the freelancer who wants simplicity and zero overhead. It’s a reliable, world-class institution that does the basics perfectly.

However, for the ambitious founder, the annual fee for Carry is often a rounding error compared to the tax savings generated by their advanced plan structures.

Which path are you on? The traditional route, or the optimized one? Pick the one that build your financial freedom faster