Investment Cost Comparison: Brokerage, Robo, and Advisor Fees (2026)

There are three ways to hold an investment portfolio, and they differ in total annual cost by well over a percentage point. Self-directed at a brokerage costs only the funds. A robo-advisor adds roughly 0.25%. A human adviser typically adds 1%. Which is cheapest is obvious; which is right depends on your balance and on whether you would actually manage the portfolio yourself.

The Three Routes, Priced Properly

Compare total drag rather than the headline fee, because each route stacks differently. Self-directed pays fund expenses only, and broad index funds are available below 0.10%. A robo-advisor adds its management fee on top of similar funds. A human adviser adds a percentage charge and frequently selects funds costing more than the cheapest index alternative, so the stack grows twice.

Convert the percentage into an annual dollar figure at your balance. A 1% fee is $500 a year at $50,000 and $12,000 a year at $1.2m for substantially the same work, and that arithmetic is what should drive the decision.

The Crossover Points

Below roughly $50,000 the absolute dollar differences are small, so convenience reasonably wins and a robo-advisor is defensible. Between $100,000 and $500,000 the robo fee becomes a real annual sum while still buying genuine automation, particularly tax-loss harvesting in taxable accounts.

Above roughly $500,000 the percentage models stop making sense for the work involved. A flat-fee planner charging $4,000 a year costs less than a 1% adviser at that balance and considerably less at $1m, for identical advice. That crossover is the single most valuable thing to know in this comparison.

                Assumptions: $250,000 start, $1,000/month,
7.0% gross return, 30 years
Self-directed, index funds at 0.06%
  Net return                              6.94%
  Final balance                       $3,097,000
Robo-advisor, 0.25% plus 0.08% funds
  Net return                              6.67%
  Final balance                       $2,948,000
  Cost versus self-directed             $149,000
Human adviser, 1.00% plus 0.55% funds
  Net return                              5.45%
  Final balance                       $2,373,000
  Cost versus self-directed             $724,000
Flat-fee planner at $4,000/yr plus 0.06% funds
  Equivalent drag falls as the balance grows
  Final balance                       $2,760,000
  Cost versus self-directed             $337,000
The flat-fee route delivers ongoing human advice
for less than half the cost of the percentage model.
              

That fourth line is the option most investors are never offered, because percentage-based charging is more profitable for the adviser at exactly the balances where it is worst for the client.

Choosing on More Than Cost

Cost is decisive between routes that deliver the same thing, and these three do not. Self-directed requires you to set an allocation, rebalance, and hold through a bear market without help. A robo automates the mechanics. A good adviser handles the decisions that are complex and irreversible, which is where advice genuinely earns a fee.

Be honest about which failure mode applies to you. Paying $149,000 over thirty years for automation is poor value if you would have invested anyway, and excellent value if the alternative was never opening the account or selling at the 2009 low.

1. Total your current annual cost in dollars, including fund expenses and any platform fee.
2. Compare it against self-directed index funds at the same asset allocation.
3. Above roughly $500,000, ask every adviser whether a flat annual retainer is available.
4. Read the Form ADV for fees, conflicts and disciplinary history before engaging anyone.
5. Reassess yearly, since the crossover point moves as your balance grows.