Yes, you can invest in your own company, and most owners do at some point. The two clean ways to do it are an equity contribution, where you buy more ownership in the business, or a shareholder loan, where you lend the company money on written terms. The IRS and the courts treat those two paths very differently, and choosing the wrong structure (or skipping the paperwork on either one) can cost you liability protection, trigger tax problems, or leave your money unprotected if the business later fails.
Your Entity Type Sets the Rules
If you operate as a sole proprietorship, “investing” in the business is just moving money from one of your pockets to another. There’s no legal separation between you and the business, no documentation required, and no tax event. The simplicity comes at a price: no liability shield either.
LLCs and corporations are separate legal persons. That separation is what creates the corporate veil protecting your personal assets from business debts, and it survives only as long as you treat the entity as genuinely independent from yourself. Every transfer between your personal accounts and the business needs to be documented and classified as either an equity contribution or a loan.
Sloppy transfers are how owners lose the veil. Courts examine whether you kept corporate formalities before deciding whether to pierce it. Common red flags: using business accounts for personal expenses, depositing personal income into the business account, and running the entity without a dedicated bank account. One informal transfer probably won’t sink you, but a pattern of commingled funds gives creditors ammunition to argue the business was never truly separate from you.
Investing as Equity
An equity investment means you put cash into the company in exchange for a larger ownership stake. In a corporation, that means newly issued shares. In an LLC, it means an increase to your capital account and, potentially, your membership percentage.
Corporate Share Issuance
Every corporation’s articles of incorporation authorize a specific number of shares. New shares issued to you come out of the authorized-but-unissued pool. If the company has already issued every authorized share, shareholders (not just the board) must approve an amendment to the articles authorizing more before any new stock can go out.
You’ll need a subscription agreement that spells out how many shares you’re buying and the price per share. Price matters. For a privately held company you can’t just pick a number. The IRS recognizes three main approaches for valuing a private business: an asset-based approach, a market comparison approach, and an income-based approach that looks at projected earnings.1Internal Revenue Service. Business Valuation Guidelines If you’re the only owner, the stakes on valuation are lower. If there are other shareholders, issuing shares to yourself below fair value dilutes them and raises fiduciary duty problems.
LLC Capital Contributions
LLCs don’t have shares. Ownership is measured by membership interest and tracked through a capital account. When you contribute more capital, the operating agreement governs how (or whether) your percentage changes. In a single-member LLC this is a bookkeeping exercise. In a multi-member LLC, the operating agreement should already spell out how additional contributions affect each member’s interest.
Either way, record the transaction in the general ledger as a debit to cash and a credit to equity (paid-in capital for a corporation, member’s capital for an LLC), and update the cap table or membership ledger to reflect the new percentages.
Investing as a Shareholder Loan
The alternative is lending money to your own company. Debt has two advantages over equity: it gets repaid before equity in a liquidation, and the interest the company pays you is deductible as a business expense, reducing the company’s taxable income. But the IRS watches these arrangements closely, and a loan that doesn’t look like a real loan gets reclassified as equity, wiping out both advantages.
What Makes a Loan Look Like a Loan
A legitimate shareholder loan needs a written promissory note with a stated principal amount, a fixed repayment schedule, a maturity date, and an interest rate that meets the IRS minimum. The company must record the loan as a liability on its balance sheet and actually make the payments. Lending money to your company, never collecting interest, and never asking for repayment is the textbook fact pattern for reclassification.
Under IRC Section 385, the IRS can recharacterize “debt” as equity based on several factors: whether there’s a written unconditional promise to pay, whether the debt is subordinated to other creditors, the company’s overall debt-to-equity ratio, whether the instrument converts into stock, and whether your debt holdings mirror your stock holdings.2Office of the Law Revision Counsel. 26 U.S. Code 385 – Treatment of Certain Interests in Corporations as Stock or Indebtedness A company that’s 95% funded by shareholder loans and 5% by equity will raise eyebrows.
Interest Rate Floor
Federal tax law targets below-market loans between a corporation and its shareholders. Under IRC Section 7872, if a demand loan charges interest below the applicable federal rate (AFR), the IRS treats the difference as a taxable transfer. For term loans, the test compares the loan amount to the present value of the required payments.3Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates In practice, your loan must charge at least the AFR the IRS publishes each month. As of February 2026, annual AFRs are 3.56% short-term (up to three years), 3.86% mid-term (three to nine years), and 4.70% long-term (over nine years).4Internal Revenue Service. Revenue Ruling 2026-3 – Applicable Federal Rates
You’ll also choose between a demand loan (callable at any time) and a term loan (fixed maturity). Demand loans are simpler and give the company less certainty; term loans lock the money up but provide stability. The AFR floor applies to either.
S Corporation Trap: The Straight-Debt Safe Harbor
S corporations can only have one class of stock.5Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined A shareholder loan that looks too much like a second class of equity can accidentally terminate the S election and drop the company into C corporation taxation.
To stay safe, structure loans to an S corp as “straight debt” under the statutory safe harbor. All four conditions must be met:
- The loan is a written, unconditional promise to pay a fixed amount on demand or by a set date.
- The interest rate and payment dates are fixed, not tied to profits, company performance, or the borrower’s discretion.
- The debt is not convertible into stock, directly or indirectly.
- The lender is an individual (not a nonresident alien), an estate, or a qualifying trust.
A loan that meets all four won’t be treated as a second class of stock.6Legal Information Institute. 26 USC 1361(c)(5) – Definition of Straight Debt This is one area where creative loan terms can backfire hard. A profit-sharing feature that seems like a good idea can blow up the whole S election.
Tax Consequences on Each Side
How your investment is taxed depends entirely on whether you structured it as equity or debt.
Equity
Cash contributed to a corporation as equity is not taxable income to the company. IRC Section 118 excludes contributions to a corporation’s capital from gross income.7Office of the Law Revision Counsel. 26 U.S. Code 118 – Contributions to the Capital of a Corporation The IRS treats the amount as additional cost basis for your shares rather than income to the business.8eCFR. 26 CFR 1.118-1 – Contributions to the Capital of a Corporation Your basis goes up by what you contributed, which reduces the taxable gain if you later sell.
Interest on a Shareholder Loan
Interest the company pays you is deductible to the company and taxable income to you. If you’re an individual and the company pays you $10 or more of interest in the year, the company must issue Form 1099-INT. Corporate recipients are exempt from that reporting.9Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID
QSBS: A Reason to Prefer C-Corp Equity
If you’re investing in a C corporation, your equity may qualify for one of the most generous tax breaks in the code. Under IRC Section 1202, you can exclude up to 100% of the capital gain when you sell qualified small business stock, provided the company’s gross assets never exceeded $75 million before and immediately after your purchase.10Office of the Law Revision Counsel. 26 USC 1202 – Partial Exclusion for Gain From Certain Small Business Stock The $75 million ceiling (raised from $50 million in 2025 by the One Big Beautiful Bill Act) begins adjusting for inflation in 2027.
Holding period drives the exclusion percentage:
- Three years: 50% exclusion.
- Four years: 75% exclusion.
- Five years or more: 100% exclusion.
To qualify, the company must be a domestic C corporation that uses at least 80% of its assets in an active business, and certain industries are excluded (finance, hospitality, professional services). The stock must be acquired directly from the company rather than on a secondary market, which is exactly the kind of transaction you’d be doing when investing in your own C corp.
What Happens if the Business Fails
One of the main reasons owners structure their investment as a loan is creditor priority. In bankruptcy, general creditors get paid before equity holders. As a creditor of your own company, you’re theoretically in line with the other people the business owes. Bankruptcy courts, however, are suspicious of insider loans.
Under Section 510(c) of the Bankruptcy Code, a court can push your claim behind outside creditors through equitable subordination. That happens when an insider creditor behaved unfairly toward the company or its outside creditors.11Office of the Law Revision Counsel. 11 U.S. Code 510 – Subordination If you used the loan to steer the company’s operations to your benefit at the expense of trade creditors, a bankruptcy court can treat your “loan” as equity for distribution purposes. Paperwork that seemed like a formality when times were good is suddenly the evidence that saves or sinks your claim.
You can strengthen your position by securing the loan with company assets and filing a UCC-1 financing statement to perfect the security interest. Under UCC Article 9, filing is generally required to perfect a security interest in most types of collateral.12Legal Information Institute. U.C.C. 9-310 – When Filing Required to Perfect Security Interest A perfected security interest gives you priority over unsecured creditors, though it won’t rescue you from equitable subordination if your conduct was inequitable.
Documentation to Have Before the Money Moves
The paperwork differs by structure, but the timing rule is the same for both: document everything before you transfer the funds.
For Equity Investments
- A written board resolution (corporation) or member consent (LLC) approving the investment, including the number of shares or units, price, and terms.
- A subscription agreement between you and the company specifying what you’re buying, how much you’re paying, and any conditions.
- An updated cap table or membership ledger reflecting the new percentages.
- Amended articles of incorporation, if the corporation has no authorized-but-unissued shares left. Shareholders (not just the board) must approve.
For Shareholder Loans
- A written board resolution or member consent documenting official approval to accept the loan.
- A promissory note stating principal, interest rate (at or above the AFR), repayment schedule, maturity date, and any security interest.
- A balance sheet entry recording the loan as a liability, not as equity or an owner contribution.
- A UCC-1 filing, if the loan is secured by company assets. Optional but strongly recommended for insider debt.
In either case, move the money by documented wire or check from your personal account to the business account. Cash deposits with no paper trail feed the commingling argument.
If You’re Not the Only Owner
Everything above assumes you own the whole company. When other shareholders or members are in the picture, putting more of your own money in raises dilution issues. Contributing $100,000 to a company worth $500,000 and issuing yourself new shares at fair value legitimately shrinks everyone else’s percentage. Issuing yourself shares at a steep discount, on the other hand, effectively takes value from the other owners, and controlling shareholders owe fiduciary duties to minorities. Before making an additional investment in a multi-owner company, check the operating agreement or bylaws for preemptive rights and any supermajority approval requirements for new issuances, and offer the same terms to every existing owner. Issuing securities also triggers federal and state notice filings (typically an SEC Form D within 15 days of the first sale), even when the transaction fits a private-placement exemption, so factor those obligations in before you close.