Complexity pricing is how flat-fee advisors scale

A financial advisor who charges $300 an hour and spends nearly two hours on unbillable work for every billed hour is pricing the practice at roughly $100 an hour. That is the arithmetic running through a new Kitces analysis of flat-fee advisory models, and it explains why so many fee-only practices eventually bolt an AUM fee back onto their service menu.

Sydney Squires, writing on Kitces' Nerd's Eye View, sorts the fee-only universe into three camps: advisors who bundle AUM fees with financial planning, flat-fee advisors who charge some combination of retainer, hourly, and project fees, and advice-only advisors who do no investment management at all. Flat-fee, subscription, hourly, and project pricing have a genuine appeal, she argues: they connect what clients pay more directly to the advice they receive, which makes them particularly attractive to clients with enough assets that a 1% AUM fee starts to feel expensive.

The catch is that flat-fee advisors often do a comparable amount of work to their AUM counterparts while generating substantially less revenue per client, and the hourly math is the starkest version of the gap. With an average rate of about $300 an hour and nearly two hours of unbillable activity piled onto every billed hour, the effective take-home lands near $100 an hour — the $100-an-hour tax on flat-fee advice. An AUM advisor charging around 1% and spending roughly 21 hours a year on a $1 million client effectively earns about $500 for each of those hours.

Flat fees are not a bad model; they just have to be priced to cover everything an advisor actually does: client meetings and plan preparation, yes, but also prospecting, marketing, compliance, administration, and implementation support — the unbillable work an hourly rate never shows. Squires recommends tracking time, even for just a month, to see how much work each client really consumes, with new clients likely to be the biggest surprise.

That time log is where flat-fee pricing actually starts. Without it, the conversation about pricing is guesswork; with it, an advisor can see which clients are subsidizing which and build a fee schedule that pushes revenue per client back toward the work per client.

That is why so many fee-only advisors end up layering AUM into their pricing. An AUM fee is, in effect, a standing proxy for client complexity, and it has a self-escalating quality: as the advisor's experience grows, revenue tied to assets grows without a renegotiation. The fully flat-fee alternative demands the harder move — adjusting fees as client needs shift and as the value of the advisor's expertise rises. A flat fee that ignores complexity will either overprice simple clients or underprice demanding ones, and both outcomes eventually break the model.

Flat-fee advice scales only when pricing does the work that AUM fees do by default. A month on the clock, followed by a fee schedule built around complexity, is the cheapest scalability investment a flat-fee practice can make. A flat-fee label promises a particular payment structure and says nothing about how much work the client will require. Advisors who run the time log and reprice by complexity can make flat fees pay like the AUM model they left; those who skip it will keep earning $100 an hour.