C Corporation
Last reviewed 2026-05-11 by Asad Ali, Founder & CEO
A standard for-profit corporation that is a separate legal entity taxed independently from its owners at the entity level.
A C corporation is a state-formed legal entity that exists separately from its owners (shareholders), officers, and directors. C-corps pay federal income tax at the entity level on Form 1120 at a flat 21% rate (set by the Tax Cuts and Jobs Act of 2017). When the corporation distributes after-tax profits to shareholders as dividends, those dividends are taxed AGAIN on the shareholder's personal return — at 0%, 15%, or 20% qualified dividend rates plus the 3.8% Net Investment Income Tax for high earners — creating the well-known "double taxation" problem. Despite this, C-corps are the preferred structure for: (1) businesses raising venture capital (VC firms cannot invest in pass-through entities), (2) companies planning to IPO, (3) businesses needing multiple share classes (preferred stock, common stock, with different voting and economic rights), (4) businesses that want to retain earnings for growth rather than distribute profits (the 21% retained rate may be lower than passing through to high-income owners at 37%), and (5) businesses planning to use Qualified Small Business Stock (Section 1202) for up to $10 million in tax-free gain on sale. C-corps have the most formal governance requirements: board of directors, annual meetings with minutes, articles of incorporation, bylaws, stock ledger. C-corps face additional issues: accumulated earnings tax penalties for retaining cash without business need, personal holding company tax, and state-level franchise taxes (Delaware franchise tax can be substantial). See IRS Form 1120 instructions.
Formula
Effective Combined Tax Rate (C-corp + dividend) = 1 − (1 − 0.21) × (1 − 0.238) = 1 − 0.602 = 39.8% (top federal rates including NIIT). Single-level pass-through tax (S-corp or LLC) at top marginal rate ≈ 37% + state, generally below the C-corp combined rate for distributed earnings.Example
A tech startup incorporates as a Delaware C-corp to facilitate venture capital fundraising. Founders receive 6,000,000 shares of common stock at $0.001 par value (paying $6,000 for their founder equity, ideally before any value accrues, and filing Section 83(b) elections within 30 days). The company raises $5M from a VC firm at $5/share post-money, issuing 1,000,000 shares of Series A Preferred. Three years later, the company earns $500,000 in pre-tax profit. Federal corporate tax = $500,000 × 21% = $105,000. After-tax profit retained = $395,000. If the board declared a dividend of all $395,000 distributed pro-rata, the founders' 6M shares (out of 7M total) = 85.7% × $395,000 = $338,571, taxed at 20% qualified dividend rate + 3.8% NIIT = 23.8%, for an additional $80,580 tax. Total tax burden on the original $500K = $105,000 + $80,580 + VC's share of taxes = effective combined rate over 35% — versus an S-corp passing through at one level of taxation around 30–37%.
Why It Matters for Your Business
C-corps are the standard structure for companies seeking outside investment or planning to IPO, and the 21% flat corporate rate can be efficient for retained earnings — but double taxation makes them inefficient for small businesses that distribute most profits.
Practical Tips
- •Choose C-corp structure when raising venture capital — VC funds (which have tax-exempt LPs) cannot invest in pass-throughs without creating UBTI/ECI tax problems
- •Use Qualified Small Business Stock (QSBS) under Section 1202 if you qualify — up to $10M in capital gain on sale can be 100% federal tax-free with 5-year holding
- •For closely-held C-corps that distribute most profits, run the numbers against an S-corp election (Form 2553) — the FICA savings and single layer of taxation usually win
- •Comply with Delaware franchise tax annually using the Assumed Par Value method (typically far cheaper than the Authorized Shares method for early-stage startups) — misfiling can result in five-figure tax bills
Common Questions About C Corporation
How is c corporation calculated?
The formula is: Effective Combined Tax Rate (C-corp + dividend) = 1 − (1 − 0.21) × (1 − 0.238) = 1 − 0.602 = 39.8% (top federal rates including NIIT). Single-level pass-through tax (S-corp or LLC) at top marginal rate ≈ 37% + state, generally below the C-corp combined rate for distributed earnings.. See the worked example below for a step-by-step calculation using realistic numbers.
What is an example of c corporation?
A tech startup incorporates as a Delaware C-corp to facilitate venture capital fundraising. Founders receive 6,000,000 shares of common stock at $0.001 par value (paying $6,000 for their founder equity, ideally before any value accrues, and filing Section 83(b) elections within 30 days). The company raises $5M from a VC firm at $5/share post-money, issuing 1,000,000 shares of Series A Preferred. Three years later, the company earns $500,000 in pre-tax profit. Federal corporate tax = $500,000 × 21% = $105,000. After-tax profit retained = $395,000. If the board declared a dividend of all $395,000 distributed pro-rata, the founders' 6M shares (out of 7M total) = 85.7% × $395,000 = $338,571, taxed at 20% qualified dividend rate + 3.8% NIIT = 23.8%, for an additional $80,580 tax. Total tax burden on the original $500K = $105,000 + $80,580 + VC's share of taxes = effective combined rate over 35% — versus an S-corp passing through at one level of taxation around 30–37%.
Why does c corporation matter for my business?
C-corps are the standard structure for companies seeking outside investment or planning to IPO, and the 21% flat corporate rate can be efficient for retained earnings — but double taxation makes them inefficient for small businesses that distribute most profits.
How does FiscalInsights help with c corporation?
FiscalInsights tracks c corporation automatically as part of its AI bookkeeping workflow. Connect your bank accounts and the platform handles categorization, reconciliation, and reporting without manual entry.
Related Terms
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Accounts Reconciliation
Ensuring account balances match between different records.
Break-Even Point
The sales volume at which total revenue exactly equals total costs — neither profit nor loss.
Financial Statements
Reports summarizing financial performance and position.
Fixed Costs
Expenses that remain constant regardless of production.
Variable Costs
Expenses that change with production or sales volume.
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