CPA vs. TurboTax:
Why Software Is Not Enough.

I am not going to tell you TurboTax is a bad product. For a W-2 employee with no investments, no side income, and no major life changes, it works. The math is accurate, the interface is clear, and for a straightforward return, it gets the job done at a low cost.

But here is the thing about tax software: it only knows what you enter. It asks you questions based on the most common situations, and it processes your answers. What it cannot do is notice what you forgot to mention, recognize the implication of something you mentioned in passing, or ask the follow-up question that changes your tax picture entirely.

That is what a CPA does. And in my forty-plus years of practice, I have seen the gap between those two approaches cost people real money, year after year.

Where Software Does Well

Let me be fair. Tax software handles the following situations reliably, and for taxpayers whose situation fits neatly into these categories, the cost savings of software may genuinely outweigh the benefit of professional preparation.

• Single W-2 income with standard deduction
• Simple interest and dividend income
• Basic itemized deductions: mortgage interest, state taxes, charitable contributions with receipts
• Clean W-2 + 1099-INT or 1099-DIV situations with no complications

If your tax life looks like this, software is probably adequate. But most people's tax lives get more complicated over time.

Where Software Falls Short

The situations below are where I consistently see software users leave money on the table, or worse, create problems they are not aware of until they hear from the IRS.

Self-Employment and Side Income

The moment you have Schedule C income, your return requires judgment. Software will ask about business income and basic expenses. It will not prompt you to think through home office deduction methodology, vehicle use documentation requirements, the deductibility of professional development, how your health insurance premium factors in, or whether a SEP-IRA or Solo 401(k) would reduce your tax burden further. These are not obscure edge cases. They are standard planning opportunities that a CPA addresses in every engagement with a self-employed client.

Rental Property

Rental properties create depreciation schedules, passive activity rules, and potential for losses that have specific limits and phase-outs depending on your income. Software can calculate the numbers. It cannot tell you whether you qualify for the real estate professional exception to passive activity rules, whether cost segregation analysis would accelerate depreciation, or how to time a sale relative to your other income. These decisions can be worth significant amounts.

Investment Activity

Simple dividends and interest: software handles it. But add options trading, cryptocurrency transactions, wash sale rules, qualified opportunity zone investments, or portfolio interest income from foreign sources, and the complexity increases significantly. The wash sale rule alone causes errors in thousands of self-prepared returns every year.

Major Life Events

Getting married, having a child, buying a home, receiving an inheritance, going through a divorce, or retiring all carry tax implications that extend beyond the year they happen. Software processes what happened. A CPA helps you plan before it happens, which is where most of the opportunity exists. Adjusting withholding after a marriage, structuring a home sale to minimize capital gains, or understanding the tax impact of retirement account distributions: these require a conversation, not a form.

Business Owners

If you own a business, the stakes on your personal and business returns are intertwined in ways that software cannot fully navigate. Entity structure, owner compensation, fringe benefits, retirement contributions, and year-end planning all require coordinated attention. A software product that processes your return in isolation is not equipped to see the full picture.

I have had clients come to me after years of self-preparation and discover that they had been missing the same deduction every single year. The cumulative amount was significant. The software never asked the question that would have surfaced it.

The Real Cost Comparison

The comparison between software cost and CPA fees is real, but it is often framed incorrectly. The question is not "how much does software cost versus a CPA?" The question is "what is the difference in my tax outcome, net of the preparation fee?"

In my experience, for self-employed individuals, business owners, and anyone with meaningful investment activity, the deductions and planning opportunities identified by a competent CPA routinely exceed the cost of the engagement. For simpler returns, this may not be the case, which is why I am honest with potential clients about whether professional preparation makes financial sense for their specific situation.

What a CPA Actually Does During Preparation

When I prepare a return, I am not entering numbers into boxes. I am reviewing the full picture of what you did during the year, asking questions about things you may not have thought were relevant, checking whether your withholding or estimated payments are aligned with your actual liability, identifying planning opportunities for the coming year, and ensuring that nothing on the return will attract unnecessary attention from the IRS.

After forty years of doing this, I know what the IRS looks for, what triggers correspondence, and what documentation to have in place before a question is ever asked. That institutional knowledge does not come in a software subscription.

Should You Switch?

If you have one of the following, a conversation with a CPA is worth your time: self-employment income of any amount, rental properties, significant investment activity, a recent or upcoming major life event, a business of any size, or an IRS notice in your history. Schedule a call. The first conversation is always without obligation, and you will know by the end of it whether professional preparation makes sense for your situation.