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IRC Section 351 Incorporation & Boot Calculator

Test control group eligibility, model Rev. Rul. 68-55 asset-by-asset boot netting, analyze Section 357 liabilities, and compute tax basis.

Control Test: FAILED(0.0%)

Property contributors own less than 80% of outstanding stock. The entire incorporation fails Section 351. The exchange is treated as a fully taxable sale of property for all transferors.

Required: ≥ 80%

Statutory Assumptions & Overrides

Inactive

Enable this if any assumed liability is found to have a non-bona fide business purpose. Section 357(b) overrides the standard tax-free debt rules, recharacterizing 100% of the assumed debt as taxable boot.

Accommodation Transferor Rule (Rev. Proc. 77-37)

If an owner contributes services and property, their stock is excluded from the 80% group unless the property's FMV is ≥ 10% of the value of services rendered. This calculator automatically applies this 10% statutory barrier.

Minimum Property Ratio: 10% of Service stock

1. Shareholder Contributions

2. Tax Treatment & Basis Allocations

Total Corporate Stock Issued$0
Total Assets Contributed (FMV)$0
Total Taxable Recognized Gain$0
Total Corporation Assets Tax Basis$0
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IRC Section 351: Tax-Free Corporate Formations and Boot Netting Explained

The creation of a corporation is generally a taxable event unless it is carefully structured to fit within the protective harbor of Internal Revenue Code (IRC) Section 351. When a business, joint venture, or startup is incorporated, partners transfer property such as cash, physical assets, patent intellectual property, or trade secrets in exchange for stock. Under general realization principles, this transfer is treated as a sale of assets for stock, sparking immediate capital gains taxes. Section 351 provides a crucial exception, allowing transferors to defer their tax liabilities, provided they meet strict statutory conditions.

The 80% Control Test & Shareholder Control Group

The foundational gatekeeper of Section 351 is the 80% Control Test. Immediately after the transfer of assets, the group of property transferors must collectively own at least 80% of the total combined voting power of all classes of stock entitled to vote, and at least 80% of the total number of shares of all other classes of stock.

Importantly, stock received in exchange for services (such as legal advice, development hours, or management work) is never considered issued for property. A service provider receiving stock is taxed immediately on the fair market value of the stock as ordinary compensation income (wages). If a service provider receives 25% of the corporation's stock, the property-contributing group is left with only 75% control—causing the entire transaction to fail Section 351, triggering immediate capital gains taxes for every single founder on their appreciated assets.

The 10% Accommodation Transferor Rule (Rev. Proc. 77-37)

To prevent a service provider from blowing up the tax-free status of the incorporation, tax advisors often use the Accommodation Transferor Rule. Under IRS Revenue Procedure 77-37, if an individual contributes both services and a substantial amount of physical or intellectual property, all of their stock is counted towards the 80% control group. To be considered "substantial," the fair market value of the contributed property must be at least 10% of the value of the stock received for services. This serves as a vital corporate planning technique.

IRS Revenue Ruling 68-55: The Asset-by-Asset Boot Allocation Rule

When a shareholder receives corporate stock plus "boot" (such as cash, short-term promissory notes, or non-qualified preferred stock), the transaction is partially taxable. To compute the gain, IRS Revenue Ruling 68-55 mandates that the transaction is treated as a collection of separate asset sales. The total consideration (stock and boot) must be allocated to each contributed asset based on its relative fair market value.

Gain is calculated individually for each asset. Realized gains are recognized up to the amount of boot allocated to that specific asset. Crucially, realized losses on individual assets are completely disallowed and cannot be recognized, nor can they be netted to reduce the recognized gains on other assets in the contribution basket.

Section 357 Liabilities: Tax Avoidance vs. Excess of Basis

Under Section 357(a), a corporation's assumption of a shareholder's debt (such as a mortgage or equipment lien) is generally not treated as taxable boot. However, there are two major exceptions:

  • Section 357(b) - Tax Avoidance: If any part of the liability assumption is motivated by tax avoidance or lacks a bona fide commercial business purpose, 100% of the assumed liabilities from that transferor are treated as taxable cash boot.
  • Section 357(c) - Liabilities in Excess of Basis: If the sum of liabilities assumed exceeds the total adjusted tax basis of all assets contributed by a shareholder, the excess is treated as recognized taxable gain. This rule is designed to prevent a shareholder's stock basis from falling below zero.

Tax Basis Calculations (Sections 358 & 362)

The tax-free nature of Section 351 is a deferral mechanism, preserved through adjusted tax basis:

  • Shareholder Stock Basis (Section 358): Calculated as the adjusted basis of the contributed assets, plus any gain recognized by the shareholder, minus any cash/boot received and liabilities assumed.
  • Corporation Asset Basis (Section 362): The corporation inherits the shareholder's historic adjusted basis, stepped up by any taxable gains recognized by the shareholder on that specific asset.
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