What Does a CPA Actually Do? (Beyond Just Filing Your Taxes)

I get this question at parties, at networking events, and — more often than you'd think — from people who have already been my clients for two years. "So what is it you actually do?"

It's a fair question. The profession has done a poor job explaining itself. Most people's entire experience of a CPA is a folder handed over in March and a return handed back in April, which makes it look like the job is data entry with a license attached.

Here's the short version: a CPA doesn't just report what happened to your money — a CPA is licensed to interpret it, plan around it, and defend it. The filing is the visible part. The judgment is the actual product.

The short answer

A CPA — Certified Public Accountant — is an accountant who holds an active license from a state board of accountancy. In Michigan, that's the Michigan Board of Accountancy.

Strip away the jargon and a CPA does four things:

1. Prepares and signs tax returns — federal, state, and local, for people and for businesses.
2. Plans ahead to legally reduce future tax — the work that happens before the year closes, not after.
3. Produces and interprets financial statements — and tells you what they mean about your business.
4. Represents you before the IRS — with full authority to speak on your behalf.

Plenty of people can do pieces of that. Only a licensed CPA can do all four — and only a CPA, an enrolled agent, or an attorney can do the fourth one at all.

The four things a CPA actually does

1. Tax preparation and filing

This is the part everyone knows, so I'll be brief. A CPA prepares and signs your returns: the 1040 for individuals, and for businesses the 1120-S, 1065, or 1120 depending on how you're structured — plus Michigan returns, and city returns if you're in a city that levies its own income tax. Grand Rapids is one of them.

The part that isn't obvious: when a CPA signs a return, they're attaching their license to it. That signature means someone with professional accountability has reviewed the positions taken on that return and is prepared to stand behind them. It is not the same as software generating a PDF.

This is the bulk of what people hire us for. It is not where most of the value is.

2. Tax planning — the part people don't know about

Here's the thing about a tax return: by the time you're filling it out, almost every number on it is already fixed. The year is over. The decisions are made. A preparer's job at that point is to report accurately and claim what you're entitled to.

Tax planning is the opposite — it happens while you can still change the outcome. That's a conversation in August about whether to buy the equipment this year or next. It's an analysis in October of whether your S-corp salary is set correctly. It's a decision in November about a retirement contribution, or Michigan's flow-through entity tax election, or a Section 179 deduction on a vehicle.

None of that can happen in April. In April I'm a historian. In August I'm useful.

This is the single biggest gap between what people think a CPA does and what a CPA is actually for. It's also why business tax planning in Grand Rapids is a separate engagement from tax prep — different work, different season, different value.

3. Accounting and financial reporting

A CPA produces financial statements — profit and loss, balance sheet, cash flow — and, more importantly, reads them back to you in English.

There's a difference between having a P&L and understanding one. I've sat with business owners who were profitable on paper and quietly running out of cash, and owners who were panicking about a loss that was really a timing artifact. The statement was correct in both cases. The interpretation was missing.

A CPA can also issue reviewed or audited statements — the kind a bank, a bonding company, or an investor will actually accept. An unlicensed accountant cannot. If a lender has ever asked you for "CPA-prepared financials," this is what they meant, and it's not a formality: they're asking for a licensed professional's assurance.

Day to day, that's CPA-led accounting services: the monthly close, the reconciliation, the reporting — and the phone call when a number looks wrong.

4. Representation and advisory

If the IRS sends you a letter, this is the one that matters.

CPAs, enrolled agents, and attorneys are the only three groups with unlimited representation rights before the IRS. That means we can speak to the IRS on your behalf, negotiate, respond to notices, and handle an audit — for any client, on any matter. Someone who only holds a PTIN cannot do that.

Most IRS letters are routine and resolvable. But the difference between "I forwarded it to my CPA and she handled it" and "I spent four hours on hold trying to explain my own return" is the entire point of the license.

The advisory half is quieter and constant: should I hire an employee or a contractor? Should I elect S-corp status? Can I afford this building? What happens to my taxes if I sell? Those are the questions that arrive by text at 9pm, and answering them well requires knowing the business — which is why I keep my client list small enough to actually know it.

CPA vs. accountant vs. bookkeeper: the license is the difference

These three words get used interchangeably. They shouldn't be.

All CPAs are accountants. Not all accountants are CPAs. "Accountant" is an unprotected term — there's no exam, no license, and no board. Anyone can print it on a business card. "CPA" is a legal credential, and using it without a license is a violation.

To hold one in Michigan, you complete 150 semester hours of education, pass all four sections of the Uniform CPA Examination, meet a supervised experience requirement, and then keep 40 hours of continuing education every single year — including ethics — for as long as you hold the license. Mine has been active for 28+ years. It can be suspended. That's the accountability the credential buys you.

Can they…	Bookkeeper	Accountant (unlicensed)	CPA
Record and categorize transactions	✓ Yes	✓ Yes	✓ Yes
Reconcile accounts, produce basic reports	✓ Yes	✓ Yes	✓ Yes
Prepare a tax return for pay	✓ PTIN required	✓ PTIN required	✓ Yes — licensed, signed
Tax planning and strategy	✗ No	✓ Basic	✓ Yes
Audited / reviewed financial statements	✗ No	✗ No	✓ Yes (licensed only)
IRS representation (unlimited rights)	✗ No	✗ No	✓ Yes
State licensing and oversight	✗ None required	✗ None required	✓ Michigan Board of Accountancy

None of this makes bookkeepers lesser — a good bookkeeper is worth their weight, and clean books are the raw material everything else depends on. It makes them different. If you're weighing which one you need first, I wrote a whole guide on CPA vs. bookkeeper.

What a CPA does that tax software doesn't

I'm not going to tell you tax software is bad. It isn't. For a W-2 earner taking the standard deduction, software is fast, cheap, and completely adequate — and I'll say so to your face rather than sell you something you don't need.

What software does well: arithmetic, forms, e-filing, and asking you questions you know the answers to.

What it can't do:

• Ask the question you didn't know to ask. Software processes what you enter. It won't notice that your "contractor" is legally an employee, or that you've been leaving the flow-through entity election on the table for three years.
• Exercise judgment in a grey area. Real tax questions rarely have a checkbox. Was that trip business or personal? What's a reasonable S-corp salary? Software takes your answer at face value. A CPA tells you when your answer won't survive scrutiny.
• Represent you afterward. If the return draws a letter, the software is not coming with you.
• Connect the books to the plan. This is the big one, and it's structural.

On that last point: I work in QuickBooks Online and Xero. When the bookkeeping and the tax strategy live under one CPA, your books aren't just a compliance record — they're the input to every planning decision, and they're accurate because the person using them is the person maintaining them. When those two functions sit with two different people who don't talk, you get clean books and mediocre strategy, or good ideas built on numbers nobody verified.

What a CPA does not do

Just as useful, and rarely said out loud.

• A CPA is not a financial advisor. Unless separately licensed for it, a CPA doesn't manage your investments or sell you products. I'll tell you the tax consequence of a move; I won't tell you which fund to buy.
• A CPA is not an attorney. I can advise on the tax implications of an entity structure. I can't draft your operating agreement, form the entity for you, or give you legal advice. Good CPAs work alongside attorneys — not in place of them.
• A CPA is not automatically your bookkeeper. Many CPAs do tax only and expect you to arrive with finished books. Some of us do both. Ask before you assume.
• A CPA can't make your tax bill disappear. Anyone promising that is either misunderstanding the law or breaking it. What planning does is make sure you don't pay more than you owe — which, in practice, is a lot of money.

And specific to my own practice, since people ask: 4K doesn't handle client billing, accounts receivable, or accounts payable. Those are operational functions better run inside your business or by a dedicated service. I do the accounting, tax, and payroll work — and I'd rather tell you that plainly than take on something I'm not the right fit for.

What a year with a CPA actually looks like

If the relationship is working, it isn't a folder in March. It's a calendar.

January – April: filing season

Returns get prepared, reviewed, and filed. Q4 estimates are trued up. If we planned properly in the fall, there are no surprises here — filing season should be the confirmation of decisions already made, not the place you discover them.

May – June: the post-mortem

The most under-used month of the year. The return is fresh, the numbers are real, and everything is still changeable. This is when we look at what the return revealed — an entity structure that no longer fits, a salary set wrong, a deduction you couldn't substantiate — and fix it while there's a whole year to work with.

July – September: mid-year check

Is the business tracking to plan? Do the quarterly estimates still make sense, or has income moved enough to adjust them? Q3 is where a good year gets protected and a bad year gets softened.

October – December: the money months

This is when tax planning actually pays. Equipment timing and Section 179. Retirement contributions. The Michigan flow-through entity tax election. Accelerating or deferring income. Every one of these has a December 31 deadline and none of them can be fixed in April.

All year: the monthly close

Underneath all of it, the books get maintained, reconciled, and reviewed — so that when a decision comes up, the numbers behind it are trustworthy.

Do you actually need a CPA?

Honestly? Sometimes not. Here's my real answer.

You probably don't need a CPA if: your income is W-2 only, you take the standard deduction, and your financial life fits on one page. Use software. Save your money.

You probably do need a CPA if any of these are true:

• You run a business as anything other than a simple sole proprietorship — an LLC, S-corp, partnership, or corporation.
• You have employees, or you're about to.
• You earn income in more than one state, or across a city income tax boundary.
• You're self-employed and paying quarterly estimates.
• You own rental property, or you're planning to sell a business or major asset.
• You've received a letter from the IRS or Michigan Treasury.
• Your return has started to include forms you don't recognize.

The trigger isn't how much money you make — it's how many decisions your money involves. A $90,000 S-corp with a vehicle and a retirement plan needs more thought than a $300,000 W-2 salary does.

If you're weighing the cost side of that decision, I've published our CPA pricing openly, and broken down the numbers across the state in how much a CPA costs in Michigan.

FAQ

What does a CPA do that an accountant can't?

Three things specifically. A CPA can represent you before the IRS with unlimited representation rights — only CPAs, enrolled agents, and attorneys can. A CPA can issue reviewed and audited financial statements that banks and lenders will accept. And a CPA holds a state license that carries real, revocable accountability for the advice given. An unlicensed accountant can keep books and prepare basic returns, but cannot do any of those three.

What does a CPA do on a daily basis?

It shifts with the calendar. January through April is dominated by preparing and filing returns. The rest of the year is a mix of monthly close work — reviewing statements, reconciling accounts, making sure the books reflect reality — plus planning conversations, quarterly estimate calculations, responding to IRS and state notices, and advising on decisions like entity election, equipment purchases, and hiring.

Is a CPA worth it for a small business?

It depends on complexity, not size. Once you have an entity beyond a sole proprietorship, employees, multi-state income, a major transaction, or an IRS letter, the planning alone typically covers the fee. The value is rarely in the filing — it's in the decisions made before the filing. If your situation is genuinely simple, a good CPA will tell you so.

What's the difference between a CPA and a tax preparer?

Anyone with an IRS-issued PTIN can prepare and file returns for pay — no education, exam, or license required. A CPA has passed the Uniform CPA Examination, met an experience requirement, and holds an active state license with mandatory annual continuing education. A tax preparer files what already happened; a CPA can also advise on what to do next and defend the return if it's questioned.

Do I need a CPA in my own city?

Not strictly — plenty of CPA work happens remotely now. But local knowledge earns its keep in specific places. Michigan has its own flow-through entity tax rules, and Grand Rapids levies a city income tax that trips up people who live in one municipality and work in another. A CPA who works in West Michigan every day knows those without looking them up.

What questions should I ask when hiring a CPA?

• Are you a licensed CPA, and is your license active in this state?
• Do you do tax planning, or only tax preparation?
• Will you handle my bookkeeping, or do I need to arrive with finished books?
• What accounting software do you work in?
• Who actually does my work — you, or someone I haven't met?
• What happens if the IRS contacts me about a return you signed?
• How often will we talk outside of tax season?