Do I Need a Financial Advisor If I Already Have a CPA?

If you're a small business owner earning $150K or more, you almost certainly need both — but they do fundamentally different jobs. Your CPA tells you what happened last year and keeps you compliant. A financial planner tells you what to do differently next year and coordinates the decisions your CPA doesn't have time to model. Here's exactly where the line is.

The short answer

A CPA and a financial advisor have almost no overlap. One is backward-looking; one is forward-looking. One handles what the tax code requires you to report; one handles what you could do before the year ends to change what you report. For most business owners earning over $150K, both are worth their cost — but they're solving different problems.

What a CPA actually does

A CPA's core job is tax compliance and accuracy. In practice, for a small business owner, that means:

• Preparing your personal return (Form 1040) and business return (Schedule C, Form 1120-S, Form 1065)
• Maximizing deductions that are already visible from your books — home office, vehicle, Section 179, self-employed health insurance
• Computing your quarterly estimated tax payments
• Entity formation paperwork (Form 2553 for S-corp election, state registrations)
• Payroll tax filings (Form 941, W-2s) if they also do bookkeeping
• IRS representation if you're audited

Notice what's on this list: these are things that happen after the year's income and spending are locked in. The deductions your CPA captures are real — but they're limited to what actually happened. The retirement plan contribution your CPA enters on Schedule 1 only exists if you made that contribution before the deadline.

What most CPAs don't do (not because they can't, but because it's a different service and you haven't asked):

• Model the tax savings from adding a cash balance plan to your solo 401(k) before year-end
• Analyze whether your current salary as an S-corp owner is optimizing FICA savings against Social Security credits and solo 401(k) employer contributions simultaneously
• Project the 10-year tax trajectory of different retirement account strategies
• Coordinate your investment account rebalancing with your income bracket
• Tell you whether your estate plan is structured correctly given your S-corp shares
• Model what selling your business would net under an asset sale vs. stock sale at different installment election structures

What a financial advisor actually does

A fee-only financial advisor's core job is forward-looking planning and decision support. For a small business owner, that means:

• Analyzing which retirement plan structure (solo 401(k), SEP IRA, SIMPLE, cash balance, safe harbor 401(k)) maximizes your deduction given income level, entity type, and whether you have employees
• Modeling your reasonable salary as an S-corp owner to balance FICA savings, Social Security benefit preservation, and retirement plan contributions
• Projecting retirement readiness incorporating both your investment accounts and expected business sale proceeds
• Coordinating timing of large financial moves — Roth conversions, Section 179 purchases, Augusta Rule meetings — with your tax year
• Insurance coverage analysis: how much disability insurance is right given your income documentation, whether key person life insurance is sized correctly for your buy-sell agreement
• Investment management for the retirement accounts and taxable portfolio you build
• Estate and succession planning that accounts for S-corp trust constraints, valuation discounts, and buy-sell funding

A financial advisor typically doesn't prepare your tax return — that stays with your CPA. But they should be communicating with your CPA before year-end to ensure the moves they're recommending actually flow through correctly on your return.

The five planning gaps between them

The most expensive planning mistakes small business owners make happen in the space between CPA work and financial planning. Here are the five most common:

1. Retirement plan design

Your CPA knows you made a $72,000 SEP IRA contribution this year and enters it on your return. What they typically don't model: whether a solo 401(k) would have let you contribute the same $72,000 while also keeping your SEP account eligible for a backdoor Roth IRA conversion. Or whether adding a cash balance plan on top of your solo 401(k) — given your age and income — would have deducted another $150,000–$280,000 before the year ended. These decisions require a model built before December 31, not after April 15.

2. S-corp salary optimization

The S-corp reasonable salary decision has at least three moving parts your CPA may handle separately: FICA tax savings from keeping salary low, Social Security benefit preservation from keeping salary high enough, and solo 401(k) employer contribution capacity (25% of W-2 wages). A financial planner models all three simultaneously against your specific income level and retirement goals. Your CPA computes the payroll tax on whatever salary you set.

3. QBI deduction optimization

The Section 199A QBI deduction phases out above $201,775 (single) and $403,550 (MFJ) in 2026. Once you're in the phase-out, retirement contributions reduce your QBI income — which can partially recover a deduction that would otherwise disappear. Modeling this interaction before year-end requires knowing your projected income, your retirement contribution options, and the exact phase-out math. Your CPA captures whatever deduction is available when they file. A financial planner calculates how to maximize it before the year closes.

4. Roth conversion windows

Business owners have a Roth conversion opportunity that W-2 employees largely don't: income variability. A down year, a year of high retirement contributions, a pre-business-sale year, the early-retirement gap before RMDs begin — these create windows where converting traditional IRA or 401(k) balances to Roth incurs tax at a lower rate than you'd otherwise pay. Your CPA will report the conversion accurately. A financial planner identifies the window, sizes the conversion to the right bracket, and coordinates it with your other income decisions. See our Roth conversion calculator for a real-time estimate of the bracket room you have in 2026.

5. Business exit coordination

If you'll ever sell your business — even 10 years from now — decisions you're making today affect how much of the sale price you keep. The asset vs. stock sale structure, the entity type at time of sale, whether your shares qualify for QSBS §1202 exclusion, the timing of installment payments against your other income — none of this is on your CPA's calendar today, and it won't be until you're mid-negotiation. A financial planner builds the exit plan well before the LOI is signed.

A practical decision guide

The question isn't really CPA vs. financial advisor. Both are useful. The question is whether your income and complexity level have crossed the threshold where financial planning creates enough value to justify its cost.

Self-assessment: do you need both?

Answer these five questions to get a quick read on your situation:

How to get the most value when you have both

The biggest efficiency gains come from making sure your CPA and financial planner talk to each other. That sounds obvious but rarely happens by default.

• Annual planning meeting before year-end (October–November). Your financial planner should be sending your CPA a planning memo that says: "We're planning to contribute $X to the cash balance plan, $Y to the solo 401k, and make a $Z Roth conversion. Here's how it flows on the return." Your CPA confirms or flags issues.
• Entity structure decisions involve both. If you're considering an S-corp election, changing from an LLC to a PLLC, or adding a second entity — your financial planner models the planning impact, your CPA handles the filing and advises on the tax mechanics.
• Mid-year income estimates. If your business is tracking significantly above or below last year, your financial planner should know so they can adjust contribution timing, estimated taxes, and any Roth conversion window. Your CPA often doesn't get this call unless there's a payroll tax deadline coming up.
• Business sale preparation. A year or more before a potential sale, your financial planner should be coordinating with your CPA on entity structure, installment sale modeling, and any final retirement plan contributions. By the time a buyer is at the table, most of these decisions are locked in.

What a fee-only financial advisor typically costs

For small business owners, the most common structures are a flat annual retainer or hourly fees. AUM-based pricing (1% of managed assets) can work but often misaligns for owners whose wealth is concentrated in business equity rather than liquid investments.

• Flat annual retainer: $3,000–$12,000/year for comprehensive ongoing planning. Higher end for complex situations (multiple entities, employees, near-term exit, etc.).
• Hourly: $250–$500/hour for project-based work or a one-time retirement plan analysis.
• AUM fee: 0.5%–1% of managed assets per year. Often paired with a smaller planning retainer for business owners whose primary wealth isn't in liquid accounts.

At $200K in net business income, a financial planner who identifies a solo 401(k) + cash balance combination you weren't using, optimizes your reasonable salary, and coordinates one Roth conversion window will typically produce first-year tax savings that cover multiple years of their fee. See our financial advisor cost and ROI guide for a worked example at your income level.