The 21% Tax Rate That Cost 39.8%

What happened

A firm taxed as a partnership converted to a C corporation for the flat 21% corporate rate, and for three years the arithmetic worked exactly as promised on money that stayed inside. In year four the owners wanted a large distribution, and their accountant showed them the second layer: a dividend taxed again at up to 20% plus the 3.8% investment income tax. By year five about $6 million of after-tax cash had piled up inside the company with no operating use, which raised the accumulated earnings tax on profits retained beyond the reasonable needs of the business. In year seven a buyer wanted the assets rather than the stock, and the sale fell two years inside the five-year recognition period.

The case, start to finish

The two rates the owners compared were never comparable, because only one of them was a rate on money that reaches a person.

A composite firm and a comparison that looked obvious

This is an anonymized composite: a three-owner US management consulting firm, with illustrative dollar figures on round numbers. Every rule cited is the real one. It is general education rather than tax or legal advice, and it describes exactly the kind of decision worth taking to a professional beforehand rather than afterward.

In 2018 the firm was an LLC taxed as a partnership. Its accountant pointed out that the federal corporate rate was now a flat 21% against a 37% top individual rate, and that as a consulting business the owners got no section 199A deduction anyway. They elected to be taxed as a C corporation. For three years the math worked exactly as promised: about $2,000,000 of pre-tax profit a year, $420,000 of federal corporate tax, $1,580,000 left inside the company. Set against the partnership years, it felt like a raise.

The year the money needed to come out

In 2022 the owners wanted a large distribution, and the accountant ran the other half of the calculation. A dividend is taxed again at up to 20% plus the 3.8% net investment income tax, which is 23.8%. A dollar of profit taxed at 21% inside the company leaves 79 cents; distribute those and the shareholder pays up to 18.8 cents more. All in, 39.8 cents on the dollar, against the 37 cents the partnership would have cost.

The 21% was never a rate anybody was going to pay. It is the rate on money that stays. The right comparison back in 2018 was 39.8% against 37%. Making it would have required a view of how the money would eventually leave the company, which is not a question anyone asks in the year they are choosing an entity.

Four doors into the same room

So they took a smaller distribution and left the rest in, which is how roughly $6,000,000 of after-tax cash and securities accumulated inside a business with almost nothing to reinvest in. That is a problem of its own. Section 531 imposes a 20% accumulated earnings tax on earnings retained beyond the reasonable needs of the business, and for a corporation principally performing services in consulting the minimum credit is $150,000 rather than the usual $250,000. A capital-hungry business can defend a large cash balance as a reasonable need. A consultancy with $6,000,000 in a brokerage account cannot say that sentence with a straight face.

Look at the menu the way the owners saw it. Pay a dividend: 23.8% on top of the 21% already paid. Pay a large bonus instead: deductible only so far as the compensation is reasonable, and an enormous bonus in the year of a sale is the textbook fact pattern for a disguised-dividend argument. Leave it in: section 531 is waiting. Sell the assets: both layers land in the same year. These are not four alternatives. They are four doors into the same room.

The fix that started working three years too late

In 2023 they elected S status. That was the right move, and it stopped the problem getting worse. It did not repair the past, because section 1374 imposes a corporate-level built-in gains tax at the corporate rate throughout a five-year recognition period beginning with the first S year.

In 2025 a buyer appeared wanting the assets rather than the stock, which is what buyers of service businesses generally want, because an asset sale gives them a stepped-up basis. The gain was about $12,000,000 and the sale landed two years into that five-year window. On the illustrative numbers the two layers cost about $4,776,000, against roughly $2,856,000 if the same assets had been sold out of the partnership: about $1,920,000 more, or 16 cents of every dollar of gain.

There was no consolation prize either. qualified small business stock relief under section 1202 requires a C corporation, and section 1202(e)(3)(A) specifically excludes consulting, health, law, accounting and financial services, which is exactly the population most often advised to incorporate in order to get it.

Three questions, in writing, before the election

Pick the entity on how the money will eventually leave, not on the rate it is taxed at when it arrives. The second layer is optional only for as long as the owners never need the cash and never sell, which is to say it is optional right up until it is the only thing that matters.

Before electing, answer three things on paper. How much of this profit will the owners need personally, year by year? What will a buyer want to buy, the assets or the shares? And how many years until that is likely to happen? None of the three is a tax question, which is why a one-year rate comparison is the wrong instrument for a decision that gets settled at the exit.

Timeline

• Illustrative — Year 0 (2018) The firm is an LLC taxed as a partnership. Its accountant points out that the corporate rate is now a flat 21% under section 11(b), against a 37% top individual rate, and that as a consulting business the owners get no section 199A deduction anyway. They elect to be taxed as a C corporation.
• Years 1–3 (2019–2021) The math works, exactly as promised, on the money that stays inside. About $2,000,000 of pre-tax profit a year, $420,000 of federal corporate tax, and $1,580,000 left in the company. Compared with the partnership years this feels like a raise.
• Year 4 (2022) The owners want a large distribution. Their accountant runs it: a dividend is taxed again at up to 20% plus the 3.8% net investment income tax, or 23.8% in all. On a dollar of profit that leaves the company, the two layers combine to 39.8 cents, worse than the 37 cents the partnership would have cost. They take a smaller distribution and leave the rest in.
• Year 5 (2023) Roughly $6,000,000 of after-tax cash and securities has piled up inside the corporation with no operating use. The accountant raises section 531: a 20% accumulated earnings tax on earnings retained beyond the reasonable needs of the business, and for a consulting corporation the minimum accumulated earnings credit under section 535(c)(2)(B) is $150,000, not the usual $250,000. They elect S status to stop the problem getting worse. It does stop it getting worse. It does not fix the past: section 1374 imposes a corporate-level built-in gains tax, at the section 11(b) rate, for a five-year recognition period beginning with that first S year.
• Year 7 (2025) A buyer appears and wants the assets, not the stock. The gain is about $12,000,000, and the sale falls two years into the five-year recognition period. On the illustrative numbers, the two layers cost about $4,776,000 against roughly $2,856,000 if the same assets had been sold out of the partnership, about $1,920,000 more, or 16 cents of every dollar of gain.

You're in the owner's chair

Year 5. About $6,000,000 of after-tax profit has accumulated inside your C corporation with nothing to spend it on, and a buyer has appeared who wants to purchase the assets rather than your shares. Your accountant lays out three routes. Which do you take?

• Drain the accumulated cash as owner bonuses before closing, so there is less inside the company when it sells
• Refuse the asset deal; insist on a stock sale at a lower headline price
• Elect S status now — the second layer disappears and you sell in two years as a pass-through

Federal tax on $1,000,000 of profit, by where it ends up

• C corporation — profit stays inside the company: 210 $ thousands
• LLC taxed as a partnership — earned and taken by the owners: 370 $ thousands
• C corporation — profit taken out as a dividend: 398 $ thousands

Illustrative, federal only, ignoring state tax and payroll tax, and assuming owners above the relevant thresholds. Consulting is a specified service trade or business, so no section 199A deduction is assumed. The second and third bars sit almost level on purpose: that near-tie is the finding. The first bar, barely half the height of the others, is the only reason anyone elects C status, and it is the one case where the money never reaches an owner.

Business model

Senior consultants sell advisory engagements to corporate clients. There is almost no capital in the business: the assets are relationships, a methodology and a client list, which is precisely why a buyer wants an asset purchase with a stepped-up basis, and why the goodwill sits inside the corporation rather than in anybody’s hands.

Revenue model

Fixed-fee and retained engagements, billed monthly. Cash converts fast and there is very little to reinvest in, which is what creates the problem. A capital-hungry business can defend retained earnings as a reasonable need under sections 533 and 537. A consultancy with $6,000,000 in a brokerage account cannot say the same sentence with a straight face.

Cost structure

Almost entirely people. That matters for entity choice in a way founders rarely price: because payroll is the dominant deduction, the corporation is genuinely profitable after paying everyone, and profit inside a C corporation is money that has already chosen its exit door whether the owners have thought about it or not.

Strategic challenge

Every route out of a C corporation is taxed, and the routes are not alternatives so much as a menu of the same problem. Pay a dividend: 23.8% on top of the 21% already paid. Pay a bonus instead: deductible only to the extent it is reasonable compensation under section 162(a)(1), and a very large bonus in the year of a sale invites exactly that argument. That is the fight the Seventh Circuit resolved in Menard, Inc. v. Commissioner, where the Tax Court had ruled that compensation above $7.1 million was excessive and treated the excess as a disguised dividend, and was reversed on 10 March 2009. Leave it in: section 531. Sell the assets: both layers, in one year.

Key decision

The decision was made in Year 0 on a one-year comparison, 21% against 37%, and the two numbers were never comparable, because 21% is the rate on money that stays and 37% was the rate on money that had already arrived. The right comparison was 39.8% against 37%, and it needed a view of the exit that nobody at the table had in Year 0.

What worked

The retention arithmetic, honestly. While the money stayed inside, the C corporation was cheaper, 21 cents on the dollar against 37, and for a business that genuinely needed to reinvest, that is a real and durable advantage. The composite firm simply was not that business.

What failed

The assumption that the second layer was optional. It is optional only for as long as the owners never need the money and never sell, which is to say it is optional until the day it is the only thing that matters. The S election in Year 5 was the right move made two years too late to help the transaction it was made for, because section 1374(d)(7) sets the recognition period at five years and the sale landed inside it.

Risk factors

Accumulated earnings tax exposure once retained cash exceeds any defensible business need; a reasonable-compensation fight if the owners try to drain the company through payroll; buyer preference for asset purchases in service businesses, which forces both layers; and the five-year built-in gains window after any S election. The usual consolation prize is not available here either. Section 1202 qualified small business stock requires a C corporation, but section 1202(e)(3)(A) excludes trades or businesses performing services in consulting, health, law, accounting, financial services and similar fields, which is exactly the population most often told to incorporate for the QSBS.

Lesson summary

Choose an entity on the way the money will leave, not the rate at which it arrives. A C corporation taxes profit twice: 21% on the way in and up to 23.8% on the way out, 39.8% all in. The only reason that ever looks cheap is that the second bill is deferred, not avoided. Before electing, answer three questions in writing: how much of this profit will the owners need personally, what will a buyer want to buy, and how many years before that happens.

Key data

• 21% Federal corporate rate (section 11(b))
• 23.8% (20% + 3.8% net investment income tax) Second layer on a dividend
• 39.8% All-in on a dollar that leaves the company
• 37% Top individual ordinary rate for comparison
• 20% of accumulated taxable income Accumulated earnings tax (section 531)
• $150,000 (section 535(c)(2)(B)); $250,000 otherwise Minimum accumulated earnings credit, consulting corporation
• 5 years from the first S corporation year Built-in gains recognition period (section 1374(d)(7))
• None — consulting is an excluded field QSBS relief for a consulting company (section 1202(e)(3)(A))
• $12,000,000 Illustrative gain on the asset sale
• ~$1,920,000, or ~16 cents per dollar of gain Illustrative extra federal tax versus one layer

Sources & basis

The business in this story is a stand-in, not a company you can look up. This case is an illustrative composite: the operator, the people and most of the dollar figures represent a pattern rather than reporting one firm's history. What the list below cites is the other half, the documented industry data and public reporting the composite was assembled from, including any real company whose published figures the case draws on by name. The mechanism and the arithmetic are real even where the business is not.

1. 26 U.S. Code section 11 — the flat 21% corporate rate View source ↗
2. 26 U.S. Code section 531 — accumulated earnings tax at 20% of accumulated taxable income View source ↗
3. 26 U.S. Code section 535 — accumulated taxable income, including the $250,000 minimum accumulated earnings credit and the $150,000 figure for corporations principally performing services in consulting and similar fields View source ↗
4. 26 U.S. Code section 1374 — built-in gains tax at the section 11(b) rate, with a five-year recognition period under subsection (d)(7) View source ↗
5. 26 U.S. Code section 1202 — qualified small business stock, including the subsection (e)(3)(A) exclusion of consulting, health, law, accounting, financial services and similar service fields View source ↗
6. Menard, Inc. v. Commissioner (7th Cir., decided 10 March 2009) — 1998 compensation of a $157,500 salary, a $3,017,100 profit-sharing bonus and a $17,467,800 5% bonus; the Tax Court’s ruling that compensation above $7.1 million was excessive and was a disguised dividend; reversed on appeal View source ↗
7. All company facts and dollar figures are an illustrative composite on round numbers. The 39.8% and $1,920,000 figures are our own arithmetic from the statutory rates cited above.