Flat-Fee vs. AUM Financial Planning: Understanding the Two Fee Models

One of the most consequential — and least understood — decisions when working with a financial planner is how that planner is paid. Fee structures vary widely across the industry, and the model used can influence both the cost of advice over time and, in some cases, the incentives at play.

This article explains the two most common fee structures used by fee-only advisors: flat-fee (or subscription-based) pricing and assets-under-management (AUM) pricing. It is intended to help you understand industry terminology and ask better questions — it is not a recommendation of any specific fee structure, advisor, or firm. The right fit depends on your individual circumstances, the complexity of your finances, and your personal preferences.

What "Fee-Only" Means

Before comparing fee structures, it's worth clarifying a related but distinct term: "fee-only" means an advisor is compensated solely by fees paid directly by clients — not by commissions on products sold. Both flat-fee and AUM models discussed below can be structured as fee-only, and fee-only status is separate from which pricing model a firm uses.

The AUM Fee Model

Under an assets-under-management (AUM) structure, an advisor charges a percentage of the assets they manage on a client's behalf — commonly in the range of roughly 0.25% to 1.5% annually, though rates vary by firm and typically decrease at higher asset levels ("breakpoints").

How it's typically calculated: The fee is usually calculated as a percentage of the account value, charged quarterly or annually, and deducted directly from the account.

Characteristics of this model:

• The dollar cost of advice scales with the size of the portfolio being managed.

• Fees generally decline as a percentage at higher asset tiers, but the dollar amount can still grow substantially as assets grow.

• The model is most directly tied to investment management as the core service, though many AUM-based advisors also provide broader planning.

The Flat-Fee (Subscription) Model

Under a flat-fee or subscription model, a client pays a fixed dollar amount — often billed monthly, quarterly, or annually — regardless of the size of their investment portfolio.

How it's typically calculated: The fee is generally based on the complexity of a client's financial situation (income, number of accounts, planning needs) rather than portfolio size, and may be tiered into service packages.

Characteristics of this model:

• The cost of advice does not automatically increase simply because a portfolio grows in value.

• Clients with smaller portfolios but complex financial situations (equity compensation, multiple income sources, business ownership) may find pricing more directly tied to the complexity of the work involved.

• Because pricing isn't linked to assets under management, some clients find it removes a potential conflict of interest around whether more assets should be brought under the advisor's management.

Questions Worth Asking, Regardless of Model

Rather than recommending one structure over another, here are categories of questions that can help evaluate any fee arrangement:

• What exactly is included? Investment management, tax planning, estate planning coordination, and ongoing check-ins vary widely by firm and by fee level.

• How does the fee change over time? Some AUM fees decrease at higher balances; some flat fees increase with added complexity or additional accounts.

• Is the firm fee-only, or does it also earn commissions? This is disclosed in a firm's Form ADV, which is publicly available.

• How does the fee compare in dollar terms to your specific situation — not just as a percentage, but as an actual annual cost given your assets and needs?

• What is the firm's fiduciary status? Registered investment advisers (RIAs) are generally held to a fiduciary standard, which is worth confirming and understanding.

The Bottom Line

Neither fee model is inherently better or worse — each can make sense depending on an individual's asset level, complexity of needs, and preferences around how they'd like to pay for advice. Understanding how a firm's fee structure works, and asking direct questions about what's included, is a useful step before entering into any advisory relationship.

This article is provided for general educational purposes only and does not constitute financial, investment, or legal advice, and it is not a recommendation of any specific advisor, firm, or fee structure. Fee ranges cited are general industry figures and may not reflect any specific firm's pricing. Please review a firm's Form ADV and consult directly with any advisor regarding their specific fees and services before entering into an agreement.