When an owner invests cash in a business, the transfer itself is not a taxable event under federal tax rules, but the amount you put in becomes your tax basis in the company and controls how much of any future loss you can deduct, how large your gain will be if you sell, and how withdrawals will be taxed later. The classification you choose (equity contribution or shareholder loan) and the paperwork you keep behind it determine whether those tax benefits actually hold up and whether your personal liability shield stays intact.
Why You Do Not Owe Tax on the Deposit
Moving personal cash into your own business is not a sale, an exchange, or income. The specific rule that shields the transfer depends on how the business is organized.
If you run a sole proprietorship, you and the business are the same taxpayer for federal purposes. Moving money between your personal account and the business account is treated the same as moving money between two of your own bank accounts. No separate entity exists to trigger a taxable event.
If the business is a partnership or a multi-member LLC taxed as a partnership, federal law provides that no gain or loss is recognized when a partner contributes money or property to the partnership in exchange for a partnership interest. Your basis in the partnership then equals the cash contributed.1Office of the Law Revision Counsel. 26 U.S. Code 721 – Nonrecognition of Gain or Loss on Contribution2Office of the Law Revision Counsel. 26 U.S. Code 722 – Basis of Contributing Partner’s Interest
If the business is a C-corporation or S-corporation, no gain or loss is recognized when you transfer cash or other property to a corporation you control, provided you own at least 80% of the stock immediately afterward. An owner who already holds a controlling stake almost always meets this test.3Office of the Law Revision Counsel. 26 U.S. Code 351 – Transfer to Corporation Controlled by Transferor
You will not owe tax on the day you write the check. What you will do is create a number, your tax basis, that matters every year the business is open.
How Your Basis Controls Future Deductions and Gain
Tax basis is a running tally of your investment for IRS purposes. It starts with the cash you contribute and gets adjusted over time as the business earns income, incurs losses, and makes distributions. Two situations put basis directly to work.
Loss Deductions Are Capped at Your Basis
If the business loses money, you can only deduct your share up to your adjusted basis. For a partnership or LLC taxed as a partnership, a partner’s deductible share of losses is limited to the adjusted basis of that interest at the end of the tax year.4Office of the Law Revision Counsel. 26 U.S. Code 704 – Partner’s Distributive Share S-corporation shareholders face a similar cap: deductible losses cannot exceed the combined basis of the shareholder’s stock and any loans the shareholder has made directly to the corporation.5Office of the Law Revision Counsel. 26 USC 1366 – Pass-Thru of Items to Shareholders
Say you invested $40,000 in your S-corp and the business loses $65,000 this year. You can deduct only $40,000 on your personal return. The remaining $25,000 carries forward to future years when you have enough basis to absorb it. Putting more cash in before year-end raises your basis and can unlock more of that loss deduction immediately. It is one of the more common reasons owners make late-year capital infusions.
Selling Later: Higher Basis, Smaller Gain
When you eventually sell your ownership interest, your taxable gain is the sale price minus your adjusted basis.6Office of the Law Revision Counsel. 26 USC 1012 – Basis of Property, Cost Every dollar you contributed reduces the gain you are taxed on. An owner who contributed $200,000 over the years and sells for $500,000 has a $300,000 gain. An owner who contributed $50,000 and sells for the same price has a $450,000 gain. Cash you put in today directly reduces the tax bill on sale day.
Equity Contribution or Shareholder Loan
Not every cash transfer has to be a permanent investment. You can also lend money to your own business, and the tax and legal consequences differ. This is one of the more consequential choices an owner makes, and getting it wrong attracts IRS scrutiny.
An equity contribution increases your ownership stake permanently. There is no repayment schedule, no interest, and no promise you will get the money back. You recover it only through distributions, a sale, or liquidation. On the upside, it strengthens the balance sheet, improves the debt-to-equity ratio lenders look at, and increases your basis for loss deductions and future gain calculations.
A shareholder loan sits on the other side of the balance sheet as a liability. You will need a written promissory note with a stated interest rate and repayment terms. For S-corporation shareholders, loans directly from the shareholder to the corporation also increase the basis available for deducting losses, which is an advantage equity and loans share.5Office of the Law Revision Counsel. 26 USC 1366 – Pass-Thru of Items to Shareholders The trade-off is that any interest the company pays you is taxable income to you. If the business pays you $10 or more of interest during the year, it must report the amount to the IRS on Form 1099-INT.7Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID
You Cannot Charge Zero Interest
Lending to your own company at zero percent or a token rate does not work. Federal law treats any loan between a corporation and its shareholders as a below-market loan if the stated interest rate falls below the Applicable Federal Rate, and the IRS will impute the missing interest as if it had actually been paid.8Office of the Law Revision Counsel. 26 U.S. Code 7872 – Treatment of Loans With Below-Market Interest Rates You would owe tax on interest you never received. A small exception exists for aggregate loans of $10,000 or less, but it disappears if the IRS determines one purpose of the arrangement was tax avoidance.
The Applicable Federal Rate changes monthly. As of March 2026, the short-term rate (for loans of three years or less) is 3.59% annually, the mid-term rate (three to nine years) is 3.93%, and the long-term rate (over nine years) is 4.72%.9Internal Revenue Service. Revenue Ruling 2026-6 – Applicable Federal Rates for March 2026 Your promissory note needs to charge at least the applicable rate to stay in compliance.
Taking the Money Back Out
Withdrawing money from the business later has its own tax rules, which turn on your entity type and whether the company has accumulated earnings.
For partnerships and LLCs taxed as partnerships, distributions are generally tax-free up to your adjusted basis. Once you have pulled out more than your basis, the excess is taxed as a capital gain. The key is tracking basis carefully so you know when you have crossed the line.
For corporations, the IRS distinguishes between dividends and return of capital. Dividends come from the company’s earnings and profits and are taxable as ordinary income, or at qualified dividend rates if the holding period requirements are met. If the corporation has no accumulated or current-year earnings and profits, the distribution is treated as a tax-free return of capital that simply reduces your stock basis.10Internal Revenue Service. Topic No. 404 – Dividends and Other Corporate Distributions Once basis reaches zero, further distributions are taxed as capital gains.
If you structured your original contribution as a loan rather than equity, repayments of principal are not taxable at all, since you are getting your own money back. Only the interest portion is income.
Documentation That Protects the Tax Treatment
Paperwork protects you in three scenarios: an IRS audit questioning whether the money was a gift, a loan, or equity; a business sale where the buyer needs to verify your capital account; and a lawsuit where creditors argue you did not treat the business as a separate entity. Skimp on the paperwork and any of those situations gets expensive.
Keep the wire transfer confirmation or a copy of the canceled check showing the exact amount, the date, and both the source and destination accounts. The paper trail should make it obvious that personal funds moved into the business account on a specific date.
Sign a written agreement between you and the company formalizing the transfer. It should state the dollar amount, the date, your legal name, and whether the contribution is equity or a loan. For a loan, include the promissory note terms: principal, interest rate at or above the AFR, repayment schedule, and maturity date. For an equity contribution, specify how the contribution affects your ownership percentage.
For corporations, the board should pass a resolution authorizing acceptance of the contribution and documenting the corresponding change in shareholder equity. LLCs accomplish the same thing through a written consent of the members or managers, depending on the operating agreement. These records confirm the business officially acknowledged and approved the investment, which matters if anyone later questions whether the transaction was legitimate.
Keeping Your Limited Liability Shield Intact
A main reason to operate through an LLC or corporation is protecting your personal assets from business debts. Courts can strip that protection if they find the business was never really separate from the owner. Two of the biggest factors courts examine are whether the owner commingled personal and business funds, and whether the business was adequately capitalized at formation. An undocumented cash transfer that shows up on a bank statement and nowhere else looks exactly like commingling. A business that starts with almost no capital and then borrows from its owner off the books looks like a shell rather than a legitimate entity.
The contribution agreement, the board resolution, and clean bank records all demonstrate that you treated the business as a separate entity with its own finances and its own governance. That formality is what keeps the liability shield intact.
How to Book the Transaction
The bookkeeping is a standard double-entry pair. Debit the cash account for the amount deposited, which increases the company’s recorded liquid assets. Credit the owner’s equity or capital contributions account for the same amount if the funds are a permanent investment. If the funds are a loan, the credit goes to a notes payable or shareholder loan account instead.
In cloud accounting software, record the deposit into the business checking account and categorize it as an owner contribution or equity investment, not as revenue. Categorizing an owner investment as revenue inflates taxable income and creates a mess to unwind at tax time. If you catch yourself coding an owner investment to an income account, stop and recategorize it before closing the period.