Why Schedule C Returns Get Audited More Than S-Corps (and the Home Office Myth)

The question I hear most often around tax time isn’t “how do I save money” — it’s “will this get me audited?” Usually it’s aimed at the home office deduction, or at the fact that the client files a Schedule C as a sole proprietor. So let me give you the honest answer, backed by the IRS’s own numbers: yes, sole proprietors are audited more than S-corporations. But the reasons are not the ones most people assume, and the home office deduction is mostly taking the blame for something else.

Here’s what the data actually shows, and what it means for how you file.

The audit gap is real

This part isn’t a rumor. Across recent years, the IRS has examined Schedule C filers at a rate of roughly 1 to 2 percent — and for sole proprietors with six-figure gross receipts, toward the higher end of that range. S-corporations and partnerships, by contrast, have been audited at around two-tenths of one percent. That makes a sole proprietor several times more likely to be examined than the same business operating as an S-corp.

This is a long-standing pattern, not a recent blip. A Government Accountability Office analysis found that back in 2008, a sole proprietor was more than nine times as likely to be audited as an S-corporation. The gap has narrowed and widened over the years, but the direction has stayed the same for a long time.

So the instinct behind the question is correct. The interesting part is why.

The real reason: how visible your income is

The IRS doesn’t look harder at Schedule C because of how the form looks. It looks harder because of how easy your income is to verify. The agency actually has a word for this — “visibility” — and it drives almost everything about who gets scrutiny.

Think about how a regular paycheck works. Your employer reports your wages to the IRS and withholds tax from every check. The income is fully visible, and there’s almost nowhere to hide. Sole proprietor income is the opposite: in many cases nobody reports it to the IRS but you.

The IRS measures the result, and the numbers are stark. In its most recent comprehensive tax-gap study, the agency found that wage and salary income — reported by an employer and subject to withholding — was misreported at a rate of about 1 percent. Partnership and S-corporation income was misreported at about 15 percent. Sole proprietor income, which carries little or no third-party reporting, was misreported at about 55 percent.

Put plainly: when no one else reports your income to the IRS, more than half of it tends to go misreported across the population. The IRS knows this — so the least visible income gets the most attention.

That’s also why sole proprietors, as a group, make up the single largest piece of the individual underreporting tax gap. The Government Accountability Office pegged it at roughly $80 billion, about 29 percent of the total, in the 2014–2016 data. Go back further and the estimates are just as pointed: the IRS figured sole proprietors misreported about 57 percent of their net business income in 2001, a roughly $68 billion shortfall in that year alone.

None of this is a statement about you personally. It’s a statement about a category — and your return type inherits the scrutiny that comes with the category.

The other thing inflating the Schedule C numbers

There’s a second reason the “sole proprietors get audited more” headline is a little misleading, and it has nothing to do with successful business owners.

A large share of Schedule C examinations are low-income filers pulled in through the Earned Income Tax Credit, a refundable credit for working people with modest incomes. Returns claiming that credit have been audited at around 0.9 percent — more than four times the roughly 0.2 percent rate for individual returns overall. Those audits are almost entirely automated letters sent by mail, and they’ve made up roughly half of all mail audits the IRS conducts, with hundreds of thousands run every year. Because self-employment income is often part of qualifying for the credit, a lot of these land on Schedule C filers.

These are cheap, high-volume mail audits — no examiner across a desk, just a letter asking for documentation. They pump up the Schedule C audit statistics without reflecting the experience most established business owners would ever have. So when you read that sole proprietors are audited more, understand that the number blends two very different worlds: genuine underreporting scrutiny, and a mass mail-audit program at the low-income end.

Why S-corps and partnerships have gotten a pass

Two things explain the lower rate on pass-through entities.

First, visibility again. An S-corp files its own return, runs payroll that reports W-2 wages to the IRS, and issues K-1 forms to its owners. More of the money is documented by someone other than you — so there’s less room for the kind of misreporting that draws an audit. That 15 percent figure versus 55 percent isn’t an accident.

Second, resources. Auditing a partnership or S-corp is complex and time-consuming, and for years the IRS collected far more revenue per hour from those cheap correspondence audits than from untangling a pass-through entity. So it underinvested in the harder cases. The Government Accountability Office has documented this directly.

One caveat worth your attention: that’s changing. With added funding since 2022, the IRS has publicly stated it intends to increase examinations of large partnerships and high-income taxpayers. So treating a low historical S-corp audit rate as a permanent guarantee would be a mistake.

An S-corp isn’t audit-proof — it just trades one flag for another

Before you read all this as “switch to an S-corp and stop worrying,” understand that the S-corp comes with its own well-known audit flag: paying yourself an unreasonably low salary to shrink your payroll-tax bill. The IRS watches for it, the court cases are public, and getting it wrong can unwind the whole benefit. I wrote about how to set that number defensibly in S-Corp Reasonable Salary.

So the honest framing isn’t “audited constantly” versus “never audited.” It’s a different return type with different points of scrutiny.

So what about the home office deduction?

Here’s the myth I most want to put to rest. The idea that claiming a home office is an automatic invitation for an audit is, at this point, outdated. Millions of self-employed people claim it every year. A clean, well-documented home office does not set off alarms at the IRS.

Two facts explain where the deduction’s bad reputation comes from:

1. It only lives on Schedule C. Since the 2017 tax law, employees can’t take a home office deduction at all (through 2025) — only the self-employed and certain partners can. So by definition, the deduction exists inside the higher-scrutiny sole-proprietor world. It looks risky mostly by association, not because the line item itself trips a wire.
2. The “exclusive use” test is what actually fails. When a home office deduction gets disallowed in an audit, it’s almost always because the space wasn’t used only for business — the desk in the guest room, the corner of the kitchen table. That exclusive-and-regular-use requirement is the single most-challenged element of the deduction.

In other words, the danger isn’t claiming a home office. It’s claiming one you don’t actually qualify for. If you have a dedicated space used only for business, photograph it, measure it, and keep those records. There are two ways to calculate the deduction — a simplified flat-rate method and an actual-expense method on Form 8829 — and either is fine when the underlying space genuinely qualifies. Claimed correctly, this is money you’re entitled to, and audit fear is no reason to leave it on the table.

What this means for how you file

Don’t let the fear of an audit drive your entity choice or talk you out of legitimate deductions. The elevated Schedule C audit rate mostly reflects people who underreport income or stretch a deduction — not people who keep clean books and document what they claim. Accurate reporting and good records are the actual protection, far more than any decision about which box your business files under.

If you’re weighing a move to an S-corp, audit exposure is a minor factor next to the self-employment-tax math — run those numbers first, and I broke down the trade-offs in Is an S-Corp Worth It?. And if a notice does land in your mailbox, don’t answer it alone; the wording of your response matters more than people realize.

This article is general information, not tax or legal advice. Audit rates and tax-gap figures change as the IRS updates its data, and your situation depends on details specific to you and your state. Talk to a qualified preparer before making decisions about how you file or respond to a notice.