Does Converting Open-Account Debt to a Note Change Debt Basis? (w/Examples) + FAQs

No. Simply converting an existing open-account debt to a formal promissory note does not change your debt basis. The basis you had in the informal loan, whether it was the full amount or an amount reduced by prior-year losses, simply carries over to the new note.

The primary conflict for S corporation owners arises directly from a federal statute: Internal Revenue Code § 1366(d). This law strictly limits your ability to deduct business losses on your personal tax return to your “basis”—the total of your investment in the company’s stock and any direct loans you’ve made to it. This creates a severe problem when shareholders, trying to help their business with informal cash advances, fail to document them correctly, leading to the IRS disallowing those hard-earned loss deductions.

This isn’t a minor issue; IRS audits frequently target shareholder basis, with a significant percentage of examinations involving scrutiny of loans between shareholders and their S corporations. A simple paperwork mistake can turn a deductible business loss into a suspended loss you can’t use, costing you thousands in unexpected taxes.

Here is what you will learn by reading this guide:

💰 The Two Types of Basis: Understand the critical difference between stock basis and debt basis and why you can’t deduct losses without them.
✍️ The Handshake vs. The Contract: Learn the massive tax difference between an informal “open-account” loan and a formal “promissory note,” especially when the company repays you.
🚫 Why Conversion Isn’t a Magic Bullet: Discover why changing an old loan’s form doesn’t create new basis and what the “economic outlay” doctrine means for you.
📈 Step-by-Step Basis Tracking: Get a line-by-line walkthrough of IRS Form 7203, the mandatory form for tracking your S corporation basis.
⚖️ Real-World Scenarios & Mistakes: See clear examples of how loan repayments and conversions play out and learn the common, costly mistakes to avoid.

The Two Worlds of Shareholder Money: Stock vs. Debt Basis

As an S corporation shareholder, you can only deduct the company’s losses on your personal tax return up to the amount of your investment. This investment is tracked in two separate pools of money: your stock basis and your debt basis. Think of them as two buckets you can use to absorb losses.

Stock basis is what you get from buying stock or contributing property to the company. Debt basis is created only when you lend money directly to your S corporation. Your total loss deduction limit for the year is the sum of what’s in both of these buckets.

This is fundamentally different from how partnerships work. Partners get to include their share of the partnership’s bank loans and other third-party debts in their basis. S corporation shareholders do not.

The reason for this strict rule is tied to personal liability. The corporate structure of an S corp shields your personal assets from business creditors. Because you aren’t personally on the hook for the company’s bank loan, the tax code says you haven’t made an “economic outlay” and therefore can’t use that debt to deduct losses.

Your Basis Isn’t Static: The Annual Rollercoaster of Adjustments

Your stock and debt basis are not fixed numbers; they change every single year based on the company’s performance. These adjustments are governed by a strict set of ordering rules found in Internal Revenue Code § 1367. It is the shareholder’s responsibility, not the corporation’s, to track this number.

First, your stock basis is increased by your share of the company’s income (both taxable and tax-exempt). Next, it is decreased by any distributions the company makes to you. Finally, after distributions, your stock basis is decreased by your share of the company’s losses and deductions.

This ordering is critical. Because distributions reduce basis before losses, you can receive tax-free distributions from a profitable company even if you have unused, suspended losses from prior years.

Once your stock basis is reduced to zero, any remaining losses “spill over” and begin to reduce your debt basis. However, distributions do not reduce debt basis. A distribution that is larger than your stock basis is typically treated as a capital gain, but it has no effect on the basis of any loans you’ve made to the company.

The Handshake vs. The Contract: Open-Account Debt and Promissory Notes

The way you document a loan to your S corporation has enormous tax consequences. The IRS splits these loans into two distinct categories: informal “open-account debt” and formal “promissory notes.”

What is Open-Account Debt?

This is the most common type of shareholder loan. It includes any cash advances you make to your company that are not documented by a formal written agreement, like a promissory note. These are often just tracked on the company’s books as “Loan from Shareholder.”

However, the tax code, specifically Treasury Regulation § 1.1367-2, sets a strict limit on this informal arrangement. A loan only qualifies for the flexible open-account debt rules if the total outstanding balance is $25,000 or less at the end of the company’s tax year.

This $25,000 rule was created to stop a specific tax strategy revealed in the court case Brooks v. Commissioner. In that case, a shareholder made a large, temporary loan at year-end to create enough debt basis to deduct losses, then had the company repay it early the next year. The $25,000 cap prevents this maneuver for significant amounts.

If your open-account balance crosses the $25,000 line at year-end, the debt is permanently reclassified. For all future tax years, it is treated as if it were a formal note, losing the key benefits of the open-account rules. One of those benefits is the “year-end netting rule,” which allows you to combine all advances and repayments made during the year, giving you a chance to add more money before year-end to offset repayments and avoid triggering income.

What is a Promissory Note?

A promissory note is a formal, legally binding written contract. It is your promise to lend money and the corporation’s promise to pay it back under specific terms. For the IRS to respect it as a “bona fide” debt, it must look like a real loan.

A proper promissory note should always include these key elements:

The names of the lender (you) and the borrower (your S corporation).
The exact principal amount of the loan.
A stated interest rate (it should be at least the Applicable Federal Rate, or AFR).
A specific maturity date or a clear repayment schedule.
Signatures from both you and an authorized officer of the corporation.

Ordinary Income vs. Capital Gains: Why the Type of Debt You Have Matters Immensely

The single biggest reason to care about the difference between open-account debt and a promissory note comes down to the tax character of repayments. If your company repays you on a loan whose basis has been reduced by losses, the tax outcome is drastically different depending on that piece of paper.

If the loan is informal open-account debt, any gain you recognize on the repayment is taxed as ordinary income. This is the highest tax rate you can pay, the same as your regular salary.

But if that same loan is documented with a formal promissory note, the repayment is treated as a sale or exchange of a capital asset under IRC § 1271. This means your gain is taxed as a capital gain, which is a much lower tax rate for most people if you’ve held the note for more than a year.

You cannot simply recover your basis first. Any repayment on a reduced-basis loan, whether open-account or a note, triggers a pro-rata amount of gain. The formula is simple: Gain = Repayment Amount ×.

Feature	Open-Account Debt	Promissory Note
Documentation	No written instrument; just book entries.	Formal written contract with specific terms.
Basis Calculation	All advances and repayments during the year are netted together (if under $25k).	Each note is a separate debt with its own basis calculation.
Gain on Repayment	*Ordinary Income* (taxed at higher rates).	*Capital Gain* (taxed at lower rates).

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Just Paperwork? Why Converting Your Loan Doesn’t Create New Basis

Now we return to the core question. When you formalize an existing open-account debt by creating a promissory note for it, you are only changing the form of the debt, not its substance. Your basis in the new note is exactly what your basis was in the old open account.

The reason is rooted in a long-standing judicial principle called the “economic outlay” doctrine. For decades, courts have ruled that to get debt basis, a shareholder must make an actual investment that leaves them “poorer in a material sense.” Simply signing a piece of paper to document a loan you already made does not involve any new cash leaving your pocket.

In 2014, the Treasury Department issued final regulations (T.D. 9682) that officially replaced the subjective “economic outlay” test with a more objective “bona fide debt” standard. However, the core principle is the same. Basis comes from a real economic investment, and formalizing a prior investment with new paperwork is not a new investment.

While the conversion itself is almost certainly a “significant modification” under Treasury Regulation § 1.1001-3, this highly technical rule rarely has an immediate tax impact in this scenario. It triggers a “deemed exchange” of the old debt for the new note, but your basis simply carries over from the old to the new. The true impact of the conversion is entirely prospective: it changes the rules for future repayments, locking in that favorable capital gain treatment.

Putting It All Together: Three Real-World Scenarios

Let’s see how these rules apply in practice. Imagine a shareholder named Alex who owns 100% of an S corporation.

Scenario 1: The Straight Conversion

Alex has an existing open-account loan to his company with a face value of $100,000. Due to past business losses that he deducted, his basis in that loan has been reduced to $40,000. He decides to formalize it.

Action	Tax Consequence
Alex and his S-Corp sign a promissory note for $100,000 to replace the open-account debt.	No immediate tax. Alex’s basis in the new note is simply a carryover of his old basis, which is $40,000. No new basis is created.
The S-Corp later repays Alex $30,000 of the principal on the note.	$18,000 Capital Gain. Because the loan is now a formal note, the gain is capital gain. It’s calculated pro-rata: `$30,000 Repayment × = $18,000`.

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Scenario 2: The Messy Combination

Assume the same facts as above ($100k loan, $40k basis). Now, Alex needs to put another $50,000 of new cash into the business. To keep things simple, he and the company sign a single new promissory note for $150,000.

Action	Tax Consequence
Alex lends $50,000 in new cash and combines it with the old $100,000 loan into a single new $150,000 promissory note.	A future accounting nightmare. The new note has a total basis of $90,000 ($40,000 from the old loan + $50,000 from the new cash). However, it is a blended instrument. Any future repayment requires a complicated pro-rata calculation allocating the payment between the reduced-basis portion and the full-basis portion.

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Scenario 3: The “Repay-and-Reloan” Gamble

Again, assume the same initial facts ($100k loan, $40k basis). Instead of converting, Alex’s advisor suggests a more aggressive strategy.

Action	Tax Consequence
The S-Corp repays the entire $100,000 open-account loan to Alex.	$60,000 of immediate Ordinary Income. Because the repayment was on an informal open-account debt, the entire difference between the face value ($100k) and the basis ($40k) is recognized immediately as high-tax ordinary income.
The next day, Alex makes a new $100,000 loan to the S-Corp, this time documented with a brand new promissory note.	A “clean” full-basis note is created. Alex now holds a new note with a face value and a basis of $100,000. Any future repayments on this new note will be a tax-free return of basis until the loan is fully paid off.

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Common Landmines: 7 Debt Basis Mistakes That Can Cost You Dearly

The rules around debt basis are a minefield for the unwary. Here are some of the most common and costly mistakes S corporation shareholders make.

Relying on a Loan Guarantee. Simply co-signing or guaranteeing a bank loan for your S corporation gives you zero debt basis. You only get basis if and when you are forced to make a payment on that guarantee.
Using Indirect Loans. Having another company you own lend money to your S corporation does not give you personal debt basis. The loan must run directly from you to the S corporation, as reinforced in the court case Welch v. Commissioner.
Trying to Fix it Later. Tax court cases like Meruelo v. Commissioner show that taxpayers are bound by the form of their transactions. You cannot use retroactive journal entries or after-the-fact promissory notes to create basis for a prior year.
Ignoring the $25,000 Open-Account Limit. Letting your informal loan balance creep above $25,000 at year-end causes it to be permanently reclassified as a note-like instrument, stripping you of the flexible year-end netting rules.
Making Repayments on Reduced-Basis Open Debt. This is the classic trap. Every dollar of repayment on an informal loan with a reduced basis triggers a pro-rata portion of high-tax ordinary income.
Using Circular “Substance-less” Loans. As seen in Oren v. Commissioner, moving money in a circle (for example, from a related company to you, to the S corp, and back to the related company) lacks economic substance and will be ignored by the IRS.
Assuming Repayments Are Basis First. Many shareholders mistakenly believe they can receive repayments tax-free up to their remaining basis. This is incorrect; the IRS requires gain to be recognized pro-rata with every single repayment.

The Shareholder’s Playbook: Do’s, Don’ts, Pros, and Cons

Navigating shareholder loans requires discipline and good habits. Following these simple rules can save you from major tax headaches during an audit.

Do’s	Don’ts
DO use a formal, written promissory note for every loan. This is the clearest evidence of your intent to create a real debt.	DON’T rely on handshakes or verbal agreements. An undocumented loan is an invitation for the IRS to recharacterize it.
DO charge a reasonable, market-based interest rate. Using at least the Applicable Federal Rate (AFR) is a minimum standard.	DON’T make interest-free loans. This is a major red flag that the advance may be a gift or capital contribution, not a loan.
DO have a fixed maturity date and repayment schedule. This shows a clear expectation of repayment, a key factor for a “bona fide” debt.	DON’T make loans “due on demand” or with no repayment terms. This makes the loan look more like a permanent investment (equity).
DO document the loan in the corporate minutes. The board of directors should formally authorize the corporation to borrow from you.	DON’T just move money between accounts. Without corporate formalities, the transaction’s purpose is ambiguous and open to IRS interpretation.
DO make and record actual payments. The corporation should make regular payments of principal and interest, and you should record the interest income.	DON’T ignore the loan’s terms. If payments are not made as scheduled, it weakens the argument that a true debt ever existed.

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Converting an existing open-account debt to a formal promissory note is a strategic decision with clear trade-offs.

Pros of Converting	Cons of Converting
Locks in Capital Gain Treatment. This is the primary benefit. It changes the tax character of gain on future repayments from high-tax ordinary income to low-tax capital gain.	Loses Netting Flexibility. You give up the ability to use the year-end netting rule for open-account debt, where you can add new funds to offset repayments made during the year.
Strengthens “Bona Fide” Debt Argument. A formal note is the strongest evidence that the advance was intended as a true loan, protecting against IRS reclassification as a capital contribution.	Requires More Administration. It’s another legal document to create, manage, and adhere to, adding a layer of formality to your operations.
Provides Legal Clarity. A note is a legally enforceable contract, providing clear rights and obligations for both you and the corporation in case of a dispute or sale of the business.	Formalizes a Repayment Obligation. While you control the S-corp, the note creates a legal requirement for the company to repay the debt, which could be relevant to outside creditors or in a bankruptcy.
Simplifies Estate Planning. Having a formal note makes it easier to value and transfer the debt as part of your estate, providing clarity for your heirs.	May Be a “Significant Modification.” While usually not a taxable event in this context, the conversion is a technical “deemed exchange” of debt instruments that must be analyzed.

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From Theory to Practice: A Line-by-Line Guide to Form 7203

Since 2021, the IRS requires many S corporation shareholders to file Form 7203, S Corporation Shareholder Stock and Debt Basis Limitations. This form forces you to calculate and report your basis annually. Understanding its three parts is essential.

Part I: Calculating Your Stock Basis

This section tracks the annual adjustments to your stock basis.

Line 1: You start with your stock basis from the beginning of the year.
Lines 2a-2k: You add all income items from your Schedule K-1. This includes ordinary business income, rental income, interest, dividends, and capital gains.
Line 4: You subtract distributions from the corporation (Schedule K-1, Box 16, Code D). This is a critical step that happens before you deduct losses.
Line 6: You subtract nondeductible expenses, like certain penalties or meal expenses.
Line 7: This is your stock basis available to absorb losses.
Line 8: You enter your share of the company’s losses for the year, but only up to the amount on Line 7. Any excess loss is carried to Part II.
Line 9: This is your final, ending stock basis for the year.

Part II: Calculating Your Debt Basis

This is where you track basis for each loan you have made to the corporation. Each loan must be listed in a separate column.

Line 16: Enter the outstanding principal balance of each loan at the start of the year.
Line 17 & 18: Adjust for any new loans made or repayments received during the year.
Line 19: This shows the ending principal balance of each loan.
Line 21: This is the most important line. Enter your debt basis at the start of the year. This may be lower than the principal balance if you’ve used it to deduct prior-year losses.
Line 22: If the company had net income for the year, you restore any previously reduced debt basis here. Debt basis must be restored before stock basis.
Line 24: Enter any excess losses from Part I (Line 8) that couldn’t be absorbed by your stock basis. This amount reduces your debt basis.
Line 25: This is your ending debt basis for the year.

Part III: Calculating Gain on Loan Repayments

This section is the “trap” that catches many shareholders.

Line 34: If you received a loan repayment during the year (Line 18) and your debt basis was less than the loan’s balance, you must calculate your gain here. The form forces you to apply the pro-rata rule and recognize income. For open-account debt, the instructions state this gain is ordinary income.

Crafting an Ironclad Promissory Note

To ensure your loan is respected by the IRS, your promissory note must be drafted correctly. It’s more than a template; every line item has a purpose and a consequence.

Principal Amount and Date: Clearly state the amount loaned and the date the funds were transferred. This must match your bank records.
Interest Rate: State a clear interest rate. To avoid complex “below-market loan” rules, the rate should be at least the current Applicable Federal Rate (AFR), which the IRS publishes monthly.
Maturity Date: The note must have a specific date when the principal is due. A loan with no end date looks like a permanent capital contribution (equity), not debt.
Payment Schedule: Detail how the loan will be repaid (e.g., “monthly payments of principal and interest,” or “all principal and accrued interest due at maturity”). This demonstrates a real intent to repay.
Default Provisions: Include language that explains what happens if the corporation fails to pay. This is a standard feature of any arm’s-length loan.
Collateral (Optional but Recommended): Securing the loan with specific corporate assets makes it look much more like a real, enforceable debt.
Signatures: The note must be signed and dated by you (the lender) and an authorized officer of the S corporation (the borrower).

Lessons from the Courtroom: Key Rulings You Can’t Ignore

Tax court cases provide a roadmap of what not to do. These landmark rulings highlight the IRS’s focus on substance and proper documentation.

Meruelo v. Commissioner: This case is a stark warning against retroactive planning. The shareholder’s CPA tried to create debt basis at year-end by making journal entries to reclassify loans from other related companies as direct shareholder loans. The court rejected this, ruling that taxpayers are bound by the form of the transaction they initially chose.
Oren v. Commissioner: This case shut down the use of “circular” loans. The shareholder orchestrated a series of same-day loans where money started at one of his companies, passed through him to the S corporation, and then immediately went back to the first company. The court found the transactions lacked economic substance because the shareholder was never “poorer in a material sense” and disallowed the basis.
Welch v. Commissioner: This case underscores the absolute requirement for a direct loan. A third party lent money directly to the S corporation, but the shareholder tried to claim it was a “back-to-back” loan through her. Because the money never actually passed through the shareholder’s personal bank account and the corporate books didn’t reflect a loan from the shareholder, the court denied the debt basis.
Brooks v. Commissioner: This is the case that led to the Treasury creating the $25,000 open-account debt rule. The court allowed a shareholder to use the year-end netting rule to create temporary basis with a large, short-term loan. The regulations were subsequently changed to prevent this for loans over $25,000.

Frequently Asked Questions (FAQs)

Q1: What happens if my open-account debt balance exceeds $25,000 at year-end? No. For that year, the netting rules still apply. But for all future years, that entire debt is treated like a formal note for basis purposes, losing the flexibility of the open-account debt rules.

Q2: Can I convert my open-account debt to a note specifically to change the character of gain on a future repayment? Yes. This is the primary strategic reason for the conversion. It does not change your existing basis amount but prospectively changes the character of gain on future repayments from ordinary income to capital gain.

Q3: Does guaranteeing a bank loan for my S corporation give me debt basis? No. A guarantee is not an economic outlay and creates no basis. You only get debt basis if you are required to, and actually do, make a payment to the lender on that guarantee.

Q4: How is S corporation debt basis fundamentally different from a partner’s basis in a partnership? Yes. Partners can include their share of the partnership’s third-party debts in their basis. S corporation shareholders cannot. A shareholder’s debt basis is created only by their direct, personal loans to the corporation.

Q5: What are the essential elements of a promissory note that the IRS will respect? Yes. A bona fide note must be a written document with the borrower and lender names, principal amount, a reasonable interest rate, a specific maturity date or repayment schedule, and signatures from both parties.

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