Flat Fee vs. AUM Fees: When 1% Starts Costing You Millions

Stephen Boatman
Apr 28
2 min read

Most financial advisors charge around 1% of your assets per year. That may not sound like much… until you run the numbers. In this article, we’ll compare a few examples below:

Traditional AUM (Assets Under Management) fees
Flat Fee model
And how the difference can impact your wealth over 20 years

The Fee Structures We’re Comparing

AUM Model (Industry Standard)

1% annually
Increases with your portfolio

Flat Fee Model (Example Structure)

Under $2.5M → $500/month ($6,000/year)
$2.5M–$5M → $1,000/month ($12,000/year)
$5M+ → $2,000/month ($24,000/year)

Scenario Assumptions

Annual return: 8%
Time horizon: 20 years
Fees deducted annually
No additional contributions

$2 Million Portfolio Example

Annual Fees

AUM (1%): $20,000/year (starting point), $72,330/year (ending point)
Flat Fee: $6,000/year (starting point), $24,000/year (ending point)

20-Year Outcome

Model	Total Fees Paid	Ending Portfolio Value
AUM (1%)	$819,909	$7,739,368
Flat Fee	$288,000	$8,777,365

Difference in wealth: $1,037,997

What’s Really Happening Here?

This isn’t just about paying higher fees.

It’s about compounding working against you.

Every dollar paid in AUM fees:

Leaves your account
Stops compounding
And reduces your future returns

Meanwhile, flat fees:

Stay fixed
Become a smaller % of your portfolio as it grows
Allow more of your money to stay invested and compound over time

The Break-Even Point

Around $1M in Investable Assets:

Costs between a 1% AUM model and a flat fee model begin to diverge meaningfully

$2M+:

Flat fees often create hundreds of thousands in savings

$5M+:

The difference in your ending portfolio value can reach $1M–$2M+ over time

When AUM Might Still Make Sense

To be fair, AUM can work if:

Your portfolio is under $600K
You value behavioral coaching tied to market performance

But at higher asset levels, the key question becomes:

Is the advisor charging 1% of assets under management, providing more value than the flat fee advisor? This answer is always it depends but I believe it would be difficult.

The Bottom Line

A 1% fee sounds small, but over time, it can add up to a 7-figure number
Once you cross $2M, the math often shifts heavily in favor of flat fees

Over 20 years, the difference isn’t just noticeable, it can be life-changing

Conclusion

Most advisors I know will see high-fee investment funds and recommend transitioning to a lower-cost option, such as Vanguard or iShares. Because you're receiving a similar service for a lower fee. Even if they are striving for a little alpha through factor investing, the factor fund fees are slightly higher, up from .07% to .18%. But often, they stop the fee compression discussions there. In reality, there are extremely similar financial planning services that clients could receive for a potentially much lower fee, depending on the assets under management.