Why Most Businesses Are Better Off as an S-Corp: A Tax Expert's Take

Every few weeks someone emails me the same question:

"If the corporate tax rate is 21% and the top individual rate is 37%, shouldn't everyone switch to a C‑Corp?"

It's a fair question. It's also the biggest structural tax myth in small business.

And it's costing owners real money.

Today I'll break down why the 21% headline rate is a mirage, why "double taxation" is the least understood part of this conversation, and the seven points I use to determine whether a C‑Corp or S‑Corp actually makes sense.

Let's dive in.

The Illusion of the "21% Tax Hack"

The C‑Corp pitch usually sounds like this:

"Why pay 37% when you could pay 21%? You're losing 16% for no reason."

Here's the problem: almost no one actually pays 37%.

Three realities destroy the guru math:

The 37% rate is marginal, only applied to the last dollars you earn.
Most taxpayers live in brackets far below that.
Your effective rate (the only rate that matters) is much lower.

Example:
A single taxpayer earning $200k has an effective federal tax rate of about 19%.
Married filing jointly? Closer to 14%.

Both are already lower than the C‑Corp's flat 21% — and we haven't even factored in the S‑Corp advantages you lose.

When you blend your actual effective rate with the S‑Corp's benefits, the "16% savings" pitch evaporates.

The Benefits You Lose With a C‑Corp

This is the part people gloss over because it's less exciting than "21% hacks." But it drives the real math.

Here are the two biggest losses:

No Qualified Business Income Deduction (QBI)
S‑Corps, partnerships, sole proprietors, and LLCs taxed as pass‑throughs all get access to the 20% QBI deduction. C‑Corps don't.

If your business makes $200,000, QBI can give you a $40,000 deduction. Lose that, and your "21% rate advantage" dies instantly.

No Pass‑Through Entity Tax Election (PTET)
Most states now allow S‑Corps and partnerships to deduct state income taxes at the entity level, bypassing the $10k SALT cap on personal returns.

C‑Corps can't do this either.

For owners in CA, NY, NJ, CT, VA, IL, or any other income‑tax state, PTET alone can be worth thousands to tens of thousands per year.

The S‑Corp gets it. The C‑Corp doesn't.

The Double Taxation People Pretend Isn't There

This is the part that finally gets people's attention.

With a C‑Corp, you pay:

• 21% corporate tax
• up to 20% qualified dividend tax
• plus 3.8% Net Investment Income Tax (for high earners)
• plus state taxes twice

Even if you try to defer distributions, eventually you're forced to take them — or you trigger:

• Personal Holding Company tax
• Accumulated Earnings Tax

Once you add all this together, most C‑Corp owners end up paying a combined rate well above what they'd owe with an S‑Corp.

The Household Income Reality Check

"Okay, but once I'm making $1M a year, the C‑Corp becomes better, right?"

Maybe. But even then, only under specific circumstances.

The median household income in 2023 was $80,610. The C‑Corp doesn't even begin to make sense until you're deep into six figures and you're reinvesting profits long term and you've run projections on QBI loss, PTET loss, and dividends.

In other words: it only works for a tiny fraction of owners, and only when planned deliberately.

When a C‑Corp Actually Makes Sense

Despite everything above, I do recommend C‑Corps in very specific cases, usually when one or more apply:

• You'll reinvest profits for 5–10 years
• You qualify for QSBS (Qualified Small Business Stock)
• You're building a company for outside investment
• You're using an international structure with deferral benefits

That's about it. These are niche, high‑intent situations — not generic small business setups.

For 99% of business owners, the S‑Corp is the most tax‑efficient structure because it eliminates double taxation, preserves QBI, allows PTET, and gives you wage‑vs‑distribution planning flexibility.

TL;DR

Why most businesses should avoid a C‑Corp:

• The "37% vs. 21%" comparison is misleading — your effective rate is much lower
• C‑Corps lose the 20% QBI deduction
• C‑Corps lose state PTET benefits
• Dividends trigger a second layer of tax
• Corporate and dividend taxes are both subject to state tax
• Current low C‑Corp rates are historically abnormal and likely to rise
• Only specialized cases actually benefit from C‑Corp treatment