Shareholder Loan vs. Capital Contribution Tax Treatment

The tax treatment of a shareholder loan versus a capital contribution comes down to this: a loan lets your corporation deduct the interest it pays you and gives you a defined right to get your principal back tax-free, while a capital contribution produces no deduction and no repayment right but increases your stock basis and avoids the risk that the IRS will reclassify the arrangement. For most owners of closely held corporations, the smarter answer is a documented blend of the two rather than an all-or-nothing choice.

The structure you pick on day one shapes your tax bill for years, controls how you can pull money back out, and determines what kind of deduction you get if the business eventually fails. The mechanics are worth understanding before you wire the money.

The Core Difference

A shareholder loan is a written debt. You lend the corporation money under a promissory note, and it owes you principal plus interest on a schedule. The corporation records a liability; you record a receivable. You hold two roles at once, owner and creditor, and the IRS will test whether you actually behave like a creditor.

A capital contribution is an investment in equity. There’s no note, no interest, no maturity date. The money becomes the corporation’s, your stock basis goes up by the amount contributed, and you only recover it later through a distribution, a dividend, a redemption, or a sale of your shares.

How a Shareholder Loan Is Taxed

The headline benefit is the interest deduction. Interest the corporation pays you on a bona fide loan is a deductible business expense, which reduces its taxable income dollar for dollar.¹ You report the same interest as ordinary income on your personal return. Repayments of principal are not taxable; you’re getting your own money back.

The deduction has a ceiling. A corporation generally cannot deduct business interest exceeding its business interest income plus 30 percent of adjusted taxable income, with any excess carrying forward.¹ A small business exception applies when average annual gross receipts over the prior three years stay under the inflation-adjusted threshold, which was $31 million for 2025.² Most closely held corporations clear that bar easily.

The Section 267 Timing Trap

If you own more than 50 percent of the stock, the corporation uses accrual accounting, and you file on a cash basis, the corporation cannot deduct accrued interest on your loan until you actually receive it and report it as income.³ The deduction isn’t lost, but it’s deferred. Corporations that have been booking deductions for interest they haven’t paid often learn about this rule on audit.

Net Investment Income Tax

Interest you receive from the corporation counts as net investment income and can be hit with the 3.8 percent surtax if your modified adjusted gross income exceeds $200,000 single or $250,000 married filing jointly.⁴ It’s easy to forget when modeling the after-tax economics.

The AFR Floor on Interest

Shareholders sometimes try to make a zero-interest or token-rate loan to keep things simple. The imputed-interest rules block that. Any loan between a shareholder and a corporation carrying a rate below the Applicable Federal Rate is treated as if the corporation distributed the forgone interest to you and you paid it back as interest, so both sides get taxed on cash that never moved.⁵

The IRS publishes AFRs monthly. Demand loans use the short-term rate. Term loans lock in the rate on the date the loan is made: short-term for three years or less, mid-term for three to nine years, long-term for over nine. A narrow exception excuses imputation when the aggregate outstanding balance between you and the corporation stays at $10,000 or less, but it disappears if a principal purpose of the arrangement is tax avoidance.⁵ Above $10,000, charging at least the AFR is non-negotiable.

How a Capital Contribution Is Taxed

Contributions to the capital of a corporation by a shareholder are not taxable income to the corporation.⁶ The corporation gets no deduction either. What you get is an increase in your stock basis equal to the amount contributed, and that basis drives the tax treatment of everything that comes later.

In a C corporation, distributions are dividends to the extent the corporation has current or accumulated earnings and profits, taxed at qualified dividend rates.⁷ Only once earnings and profits are exhausted does a distribution become a tax-free return of capital that reduces basis, and anything beyond remaining basis is a capital gain.

In an S corporation, distributions generally come out tax-free up to the Accumulated Adjustments Account balance and your stock basis. The more interesting S corporation question is how a contribution interacts with losses, covered below.

One meaningful upside sits on the C corporation side. If the stock qualifies as Section 1202 qualified small business stock, you may exclude a large portion of the gain when you eventually sell. For stock issued after July 4, 2025, the exclusion reaches 100 percent of gain after a five-year hold, capped at the greater of $15 million or ten times your basis per issuer. Eligibility is strict, including a $50 million gross asset ceiling and limits on the corporation’s line of business, but qualifying companies produce substantial savings.

The S Corporation Debt Basis Angle

If the corporation is an S corporation, the loan-versus-contribution choice carries extra weight. Pass-through losses are deductible only up to the sum of your stock basis and your debt basis, and debt basis exists only when you’ve personally loaned money to the corporation.⁸

Say you’ve put in $100,000. Split evenly between a contribution and a loan, you have $50,000 of stock basis and $50,000 of debt basis, totaling $100,000 of room to absorb losses. If you put the whole $100,000 in as equity, the total is still $100,000, but it’s all stock basis. The ordering rules make the difference: losses reduce stock basis first, then debt basis.⁹

There’s a trap on the back end. If losses have reduced your debt basis and the corporation later repays the loan, the repayment is taxable to you to the extent it exceeds the reduced debt basis.⁹ Debt basis gets restored by future pass-through income, but the timing rarely matches the repayment schedule, and shareholders who assume loan repayments are always tax-free get surprised.

Recharacterization: The Risk That Erases the Loan Benefit

The biggest downside of a shareholder loan is that the IRS can reclassify it as a capital contribution. If that happens, every interest deduction the corporation claimed is lost, and the principal payments you received become taxable dividends. The resulting bill, plus penalties and interest, is substantial.

Congress authorized regulations distinguishing debt from equity and listed factors including whether there’s a written unconditional promise to pay, subordination to other creditors, the debt-to-equity ratio, convertibility into stock, and whether loan holdings track stock ownership.¹⁰ No final regulations exist, so courts weigh these factors case by case with no single factor controlling.

The patterns that typically sink a shareholder loan:

No written promissory note with a fixed maturity date and stated interest rate.
Scheduled interest or principal payments the corporation never makes and the shareholder never demands.
Thin capitalization. A debt-to-equity ratio above 3:1 draws heightened scrutiny, though no bright-line safe harbor exists.
Loans from each shareholder in exact proportion to stock ownership, suggesting everyone really just increased equity.
Subordination to every outside creditor, leaving you last in line in a liquidation.
Terms no outside lender would accept for a comparable loan.

The burden sits on you. The IRS doesn’t have to prove your loan is equity; you have to prove it’s debt. Every missing formality cuts against you.

Documentation That Holds Up

A shareholder loan needs paperwork that would satisfy an unrelated lender. At a minimum: a written promissory note signed by both parties, principal amount, a commercially reasonable rate at or above the AFR, a fixed maturity date, and a repayment schedule. The rate should approximate what the corporation would pay a bank for a comparable loan.

The board of directors should formally authorize the loan by resolution recorded in the minutes, identifying the borrower, the amount, the rate, the repayment timeline, and a finding that the corporation can service the debt without impairing operations.

If the loan is secured by corporate assets, perfect the security interest. For most personal property collateral that means filing a UCC-1 financing statement with the appropriate state office.¹¹ Filing fees typically run between $10 and $100 depending on the state.

The corporation must file Form 1099-INT reporting interest of $10 or more paid to you during the tax year.¹² Skipping it signals the parties aren’t treating the arrangement as true debt.

Then the corporation has to actually pay. Keep an amortization schedule, record each payment in the ledger, and if a payment can’t be made, formally amend the note instead of letting the default slide. Quietly ignored defaults are the single clearest sign of a loan that isn’t real.

Capital contributions need less paper but shouldn’t be casual. A board resolution accepting the contribution, updated equity accounts, and accurate basis tracking cover the essentials, and the basis records matter later for distributions and S corporation loss deductions.⁹

Getting Your Money Back Out

Loan repayments follow the note. Principal comes back tax-free, interest is deductible to the corporation and ordinary income to you, and no additional board action is required beyond the original authorizing resolution. This clean, predictable withdrawal path is the loan structure’s main practical advantage.

Withdrawing a capital contribution is messier and usually more expensive. Money comes out as a distribution, dividend, or stock redemption, each requiring board action. In a C corporation, a distribution is a dividend to the extent of earnings and profits before any of it becomes a tax-free return of basis.⁷ A stock redemption can qualify for capital gain treatment if it meaningfully reduces your ownership, but if it fails the tests under the redemption rules, the whole payment is a dividend.¹³ A sole shareholder can rarely meet those tests without bringing in an outside buyer.

If the Business Fails

Loss treatment is where the two structures diverge sharply. A worthless shareholder loan is deducted as a bad debt. If it qualifies as a business bad debt, meaning it was created in connection with your trade or business, you can deduct it in full as an ordinary loss.¹⁴ Most shareholder loans to a closely held corporation are classified as nonbusiness bad debts because the dominant motive is protecting the investment, not running a lending business. A nonbusiness bad debt must be totally worthless to be deductible, and the deduction is a short-term capital loss regardless of how long you held the note.¹⁵ Only $3,000 of net capital loss can offset ordinary income per year, with the rest carrying forward.

Worthless stock from a capital contribution is treated as sold for zero on the last day of the tax year, producing a long-term capital loss if you held the stock more than a year.¹⁶ That loss is subject to the same $3,000 annual cap against ordinary income.

The upshot: a loan that qualifies for ordinary bad-debt treatment produces the best possible loss recovery; a nonbusiness bad debt and worthless stock land in roughly the same slow lane.

Choosing the Mix

Experienced advisors rarely recommend an all-loan or all-equity approach. A documented blend tends to give the best combination of interest deductions, basis flexibility, and defensibility. The loan portion produces current interest deductions and a clean repayment mechanism. The equity portion keeps the debt-to-equity ratio reasonable, bolsters the loan’s bona fides against recharacterization, and raises your stock basis for distributions and S corporation loss absorption.

The right split depends on how the corporation is already capitalized, whether its cash flow can service the debt, and whether it’s a C or S corporation. S corporations gain the most from loans during loss years because of debt basis. C corporations gain the most when they’re profitable enough to use the interest deduction and small enough to avoid the Section 163(j) limitation. Whatever ratio you choose, document it fully at the outset. Repairing sloppy paperwork after an IRS notice arrives is far harder than building it right the first time.

1
Office of the Law Revision Counsel. 26 USC 163 – Interest
2
Internal Revenue Service. Questions and Answers About the Limitation on the Deduction for Business Interest Expense
3
Office of the Law Revision Counsel. 26 U.S. Code 267 – Losses, Expenses, and Interest With Respect to Transactions Between Related Taxpayers
4
Office of the Law Revision Counsel. 26 U.S. Code 1411 – Imposition of Tax
5
Office of the Law Revision Counsel. 26 U.S. Code 7872 – Treatment of Loans With Below-Market Interest Rates
6
Office of the Law Revision Counsel. 26 USC 118 – Contributions to the Capital of a Corporation
7
Internal Revenue Service. Topic No. 404, Dividends and Other Corporate Distributions
8
Office of the Law Revision Counsel. 26 U.S. Code 1366 – Pass-Thru of Items to Shareholders
9
Internal Revenue Service. S Corporation Stock and Debt Basis
10
Internal Revenue Service. Internal Revenue Bulletin 2016-17
11
Cornell Law Institute. Uniform Commercial Code 9-311 – Perfection of Security Interests in Property Subject to Certain Statutes, Regulations, and Treaties
12
Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID
13
Office of the Law Revision Counsel. 26 USC 302 – Distributions in Redemption of Stock
14
Internal Revenue Service. Topic No. 453, Bad Debt Deduction
15
Office of the Law Revision Counsel. 26 U.S. Code 166 – Bad Debts
16
eCFR. 26 CFR 1.165-5 – Worthless Securities