Capital contributions to a single member LLC are documented through three matching records created on the same date: a bank deposit or title transfer into the LLC’s own account, a journal entry to the owner’s equity account in the LLC’s books, and a short written resolution stating the date, amount, and purpose. Because the IRS treats a single member LLC as a disregarded entity, the contribution is not a taxable event and no separate return reports it, but the paper trail still does real work. It preserves the liability shield, sets your tax basis, and controls whether future withdrawals come out tax-free.1Internal Revenue Service. Single Member Limited Liability Companies
Documenting a Cash Contribution
Every cash contribution needs three records, all dated the same day.
- Bank record. Deposit the funds directly into the LLC’s dedicated business bank account. The deposit slip or electronic transfer confirmation is the primary third-party evidence.
- Ledger entry. Record the deposit as a credit to your owner’s equity (capital) account in the LLC’s general ledger. This is not revenue. A contribution goes on the balance sheet, not the income statement.
- Written resolution or memo. A short signed note in the LLC’s records: “On [date], the sole member contributes $[amount] as additional capital.”
The date the funds hit the business bank account is the official contribution date for both book and tax purposes. Label the transfer clearly when it moves from your personal account. Dropping a personal check into the business account with no supporting entry is the kind of sloppy recordkeeping that invites veil-piercing arguments from creditors and creates problems in an audit.
Your operating agreement should authorize additional contributions and require a written resolution for each one. Even with a single member, that provision is what makes each later contribution look like a deliberate corporate act rather than a casual transfer of household money.
Documenting a Property Contribution
Contributing equipment, a vehicle, real estate, or other property takes more paperwork than cash. You have to establish both what you transferred and what it was worth.
Start with a bill of sale or assignment document identifying the property, the transfer date, and the parties (you personally as transferor, the LLC as recipient). For titled assets, complete the legal transfer of title: record a new deed for real property, update the vehicle title into the LLC’s name. Skipping this leaves the asset legally in your name, which undermines the LLC’s ownership claim and weakens liability protection.
For the LLC’s books, record the property at its fair market value on the transfer date. An independent appraisal is the strongest FMV evidence; for lower-value items, comparable sales data or dealer quotes can suffice. Keep whatever valuation support you use in the permanent files.
For tax purposes the number is different, and this is where SMLLC owners often get confused. Because a disregarded entity is treated as identical to its owner, transferring property into it is not a taxable event. You recognize no gain or loss. The property keeps the same adjusted basis it had in your hands, meaning original cost minus any depreciation you already claimed. Depreciation continues under the same method and remaining useful life, not a fresh schedule based on FMV.2Internal Revenue Service. Publication 946 – How To Depreciate Property Equipment bought for $20,000 two years ago with $6,000 of depreciation already claimed enters the LLC with a $14,000 adjusted basis.
Property carrying a liability, such as a mortgage, adds a wrinkle. For a disregarded entity, the liability transfer generally has no immediate tax consequence because the IRS does not see a change in ownership. If the LLC later adds a member and becomes a partnership, or if you elect corporate treatment, the Section 752 liability allocation rules can be triggered and produce taxable gain when debt exceeds basis.3Federal Register. Treatment of Disregarded Entities Under Section 752 Document the outstanding balance on any encumbrance at the time of contribution so you have a clean starting point if the entity’s classification later changes.
Contribution or Owner Loan?
A capital contribution is money or property you put in with no expectation of repayment. It permanently increases your ownership stake and your basis. An owner loan creates a debtor-creditor relationship: the LLC owes you money and repays it on a schedule with interest. Each has different tax consequences when cash later flows back to you, so get the label right at the outset.
For the IRS to respect an owner loan, the arrangement has to look like real lending. That means a written promissory note, a fixed repayment schedule with a maturity date, and interest at or above the applicable federal rate. The AFR changes monthly; in early 2026, the short-term AFR is approximately 3.59%, mid-term around 3.93%, and long-term around 4.72%. Charging less than the AFR lets the IRS impute interest income to you even though you never received it.4Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates
The loan also has to behave like a loan over time. If the LLC consistently skips interest, or never pays down principal, the IRS can reclassify the whole amount as a capital contribution. That reclassification is permanent. You lose the ability to receive tax-free loan repayments, and any future return of those funds falls under the distribution rules instead.
When in doubt, call the transfer a contribution. Misclassifying a contribution as a loan is worse than the reverse: it can generate phantom interest income and penalties.
What the Contribution Does to Your Basis
Your basis in the SMLLC is your total investment for tax purposes. It is not identical to the equity balance on the LLC’s balance sheet, though the two move together. Basis determines how much in losses you can deduct, how much you can withdraw tax-free, and what your taxable gain is if you sell the business.
Initial basis is cash contributed plus the adjusted basis (not FMV) of any property contributed. From there it changes every year:
- Additional cash or property contributions increase basis.
- The LLC’s net income on Schedule C increases basis.
- Distributions you take reduce basis.
- The LLC’s net losses reduce basis.
Basis cannot drop below zero. Losses that would push it negative are suspended and carry forward, becoming deductible when your basis rises again through new contributions or profitable years. This is the direct link between contribution paperwork and loss deductions: every dollar of documented contribution raises the ceiling on how much loss you can claim in a bad year.
No IRS form requires you to file a basis calculation with your return. Keep an annual basis worksheet in the LLC’s records anyway. If you claim a large loss or report a distribution as a nontaxable return of capital, the IRS can ask you to prove the basis behind it. Without documentation, you start from zero, and the burden of proof is on you.5Internal Revenue Service. Burden of Proof
Taking Money Back Out
Withdrawals depend entirely on your current basis. A distribution up to your adjusted basis is a tax-free return of capital, and each withdrawal reduces remaining basis by that amount. Distributions above basis are generally taxed as capital gain. That is where thin documentation gets expensive: withdrawals that should have been tax-free get reclassified as taxable gains because you cannot prove the contributions that built the basis.
Loan repayments are different. Principal paid back on a legitimate owner loan is not a distribution, does not reduce basis, and is not taxable. But the LLC’s books must record the payment against notes payable, not owner’s equity. Coding a loan repayment as a distribution needlessly cuts your basis and can trigger a capital gain on a later withdrawal that would otherwise have been free.
Interest the LLC pays on the loan is deductible as a business expense on Schedule C and reportable as interest income on your personal return. The federal income tax effect is close to a wash, but the interest income escapes self-employment tax, which can produce a small net benefit.
Contributions Do Not Change Self-Employment Tax
A common misconception is that leaving profits in the business, or feeding new capital in, changes self-employment tax. It does not. Self-employment tax is calculated on the LLC’s net profit reported on Schedule C, whether you withdraw the money or reinvest it.6Internal Revenue Service. Topic No. 554 – Self-Employment Tax Capital contributions and owner draws only move money between your pocket and the business account. Neither changes Schedule C net profit, so neither moves the SE tax number.
The only way to reduce SE tax on LLC profits is to elect S corporation treatment on Form 2553, splitting income between a reasonable salary and distributions. That election changes the entire framework for capital contributions and calls for a separate analysis.
What Weak Records Actually Cost
The IRS places the burden on you to prove every deduction, basis figure, and tax-free distribution.5Internal Revenue Service. Burden of Proof Without substantiation, loss deductions can be disallowed and distributions reclassified as taxable income.
The accuracy-related penalty under Section 6662 adds 20% to any underpayment caused by negligence or substantial understatement. Overstating basis by 150% or more of the correct figure triggers a substantial valuation misstatement penalty at the same 20% rate. Overstate by 200% or more and the penalty doubles to 40%.7Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments These penalties apply to the portion of underpayment tied to the misstatement, not the whole tax bill, but they add up quickly when the IRS zeroes out a basis you cannot prove.
Poor documentation also creates liability exposure outside of tax. If a creditor sues and can show you treated the business account like a personal piggy bank, a court may disregard the LLC and hold you personally liable. Courts evaluating veil-piercing look for commingled funds, inadequate capitalization, no operating agreement, and no formal records. Single member LLCs draw this scrutiny more often than multi-member entities because there is no second owner enforcing formalities. A separate bank account that never touches personal funds is the single most important habit for keeping the shield intact.
If You Later Change Tax Classification
The rules above assume the SMLLC stays a disregarded entity. Filing Form 8832 to elect corporate treatment, or Form 2553 for S corporation status, shifts the framework.
When a disregarded entity elects corporate classification, the IRS treats the owner as contributing all of the LLC’s assets and liabilities to a newly formed corporation in exchange for stock. The deemed contribution is generally tax-free under Section 351 as long as you control the corporation immediately afterward.8Internal Revenue Service. Form 8832 – Entity Classification Election The asset bases at that moment become locked in, which is exactly why accurate basis records from the disregarded period matter. If you cannot prove what the assets were worth in basis terms at conversion, you start the corporate era on an uncertain foundation that compounds every year after.
After the election, new capital contributions follow corporate rules. Money you put in becomes additional paid-in capital or a shareholder loan, each with its own documentation and tax consequences. Distributions leave the simple return-of-capital framework for the rules governing corporate dividends or S corporation distributions. The transition runs one direction: once you elect corporate treatment, you generally cannot revert to disregarded entity status for five years.