When you’re a shareholder in an S corporation or a member of an LLC, understanding how to properly document loans to your business can unlock significant tax advantages. A properly structured shareholder promissory note can increase your tax basis, allowing you to deduct more business losses and potentially save thousands in taxes.
However, the IRS scrutinizes these arrangements closely. Without proper documentation and adherence to specific requirements, your loan might not be recognized for tax purposes—leaving you unable to claim valuable deductions.
This comprehensive guide walks you through everything you need to know about creating a bona fide promissory note between shareholders and their S corporations or LLCs, including the critical tax basis benefits and what happens if your company faces financial difficulties.
Key Takeaways
✓ Proper Documentation Unlocks Tax Benefits: A bona fide shareholder promissory note increases your tax basis in S corporations (debt basis) and LLCs (outside basis), allowing you to deduct business losses that would otherwise be suspended. Without the right documentation, you lose these valuable deductions.
✓ Nine Essential Requirements Must Be Met: Your promissory note must include written documentation, a definite principal amount, fixed repayment terms, adequate interest (at least the IRS applicable federal rate), unconditional promise to pay, commercially reasonable terms, legal enforceability, and proper recordkeeping with actual payments.
✓ Failed Loans Can Still Provide Tax Relief: If your company can’t repay the loan, you may claim a bad debt deduction—typically as a short-term capital loss for most shareholders, or as an ordinary loss if the loan was made in the course of your trade or business. The debt must be wholly worthless and properly documented.
What is a Shareholder Promissory Note?
A shareholder promissory note is a formal written agreement where a shareholder or LLC member loans money to their business entity. This document serves as legal evidence of the debt and outlines the repayment terms, interest rate, and other important conditions.
For tax purposes, this isn’t just paperwork—it’s the foundation for increasing your tax basis, which directly affects how much in business losses you can deduct on your personal tax return.
Why Tax Basis Matters for S Corp and LLC Owners
Understanding Tax Basis
Your tax basis represents your investment in the business. For S corporation shareholders and LLC members, basis determines how much in business losses and deductions you can claim on your personal income tax return.
The Basis Limitation Problem
Without sufficient basis, you cannot deduct your share of business losses, even if those losses are legitimate. These losses become suspended and can only be used in future years when you have adequate basis.
This is where shareholder loans become powerful: they increase your basis, unlocking the ability to deduct current-year losses.
Tax Basis Benefits: S Corporations vs. LLCs
S Corporation Shareholders: Debt Basis Rules
For S corporation shareholders, a bona fide loan to your corporation increases your debt basis under Internal Revenue Code Section 1366(d)(1)(B). Here’s what you need to know:
- Direct Loan Requirement: The debt must run directly from the S corporation to you as the shareholder—not through intermediaries
- Economic Outlay: You must be “poorer in a material sense” after making the loan, meaning real money must leave your pocket
- Deduction Limit: You can deduct S corporation losses up to the sum of your stock basis plus your debt basis
- Basis Calculation: Stock basis is used first, then debt basis for loss deductions
Example: If you have $10,000 in stock basis and loan your S corp $50,000 with a proper promissory note, your total basis becomes $60,000. If the S corp has a $45,000 loss this year, you can deduct the entire amount instead of being limited to $10,000.
LLC Members: Partnership Basis Rules
For LLC members (when the LLC is taxed as a partnership), shareholder loans increase your outside basis under IRC Section 752:
- Recourse Loans: If you’re personally liable for the debt, your basis increases by the full loan amount
- Nonrecourse Loans: Your basis increases by your share of the liability based on your ownership percentage
- Loss Deduction: You can deduct partnership losses up to your adjusted basis, including loan amounts
- Flexibility: Partnership basis rules generally provide more flexibility than S corporation debt basis rules
9 Essential Requirements for a Bona Fide Promissory Note
The IRS will challenge shareholder loans that don’t meet the requirements of a legitimate, arm’s-length transaction. To ensure your promissory note withstands IRS scrutiny, it must include these nine critical elements:
1. Written Documentation
Your loan must be evidenced by a written promissory note, properly executed and signed by both parties:
- The shareholder/member (as lender)
- The S corporation or LLC (as borrower, signed by an authorized officer)
Oral agreements or informal arrangements won’t qualify. The documentation proves the loan’s legitimacy and helps establish it as true debt rather than equity.
2. Definite Principal Amount
The note must state a fixed principal amount that the company will repay. This creates certainty about the obligation and prevents the IRS from claiming the amount was indefinite or discretionary.
Example: “The Borrower promises to pay to the Lender the principal sum of Fifty Thousand Dollars ($50,000).”
3. Fixed Repayment Terms
Your promissory note must specify either:
- A fixed maturity date (e.g., “due on December 31, 2028”)
- A clear repayment schedule (e.g., “payable in 60 monthly installments of $X”)
- Demand provisions (if payable on demand, this should be explicitly stated)
Indefinite or open-ended repayment terms suggest equity investment rather than debt, which won’t increase your basis.
4. Adequate Stated Interest Rate
This is a critical requirement that many shareholders overlook. Your note must provide for an interest rate at least equal to the applicable federal rate (AFR) to avoid imputed interest under IRC Section 7872.
- Interest should be payable at least annually
- The AFR changes monthly and varies based on loan term (short-term, mid-term, or long-term)
- If you charge below AFR, the IRS may impute interest income to you, creating unexpected tax consequences
Where to find AFR rates: The IRS publishes applicable federal rates monthly in Revenue Rulings, available on IRS.gov.
5. Unconditional Promise to Pay
The note must contain an unconditional promise by the entity to repay both principal and interest. The repayment obligation shouldn’t be contingent on:
- Company profitability
- Business success
- Discretionary board decisions
- Other conditional events
Conditional repayment terms make the arrangement look more like equity than debt.
6. Security or Collateral (Recommended)
While not legally required, granting the lender a security interest in company assets significantly strengthens your case for bona fide debt:
- Creates a priority claim against business assets
- Demonstrates commercial substance
- Shows the loan was structured like a real third-party transaction
- Provides recourse if the company defaults
7. Commercially Reasonable Terms
Your promissory note should include provisions that would appear in an arm’s-length transaction with an unrelated third party:
- Right to recover attorney’s fees and collection costs
- Default provisions and remedies
- Acceleration clauses
- Late payment penalties
- Guarantees by other members or shareholders (if appropriate)
The more your note resembles a commercial loan, the better it will withstand IRS challenges.
8. Legal Enforceability
The note must be legally enforceable under state law. This means:
- Proper execution according to state requirements
- No provisions that would make it unenforceable
- Compliance with usury laws
- Adherence to any state-specific lending regulations
Consider having an attorney review your note to ensure enforceability.
9. Proper Recordkeeping and Payment History
Creating the note is just the beginning. To maintain its validity:
- Record the loan on the company’s books and balance sheet
- Make payments according to the note’s terms
- Document all transactions (principal payments, interest payments)
- Issue tax forms (the corporation should issue Form 1099-INT for interest paid)
- Maintain consistent treatment across all financial statements and tax filings
Failure to follow the note’s terms—especially missing interest payments—can cause the IRS to reclassify the loan as equity.
What Happens When Your Company Can’t Repay the Loan?
Business failures happen. If your S corporation or LLC ceases operations and cannot repay its debts, you have options—but you must follow specific rules to claim a tax benefit.
Bad Debt Deduction Under IRC Section 166
When a shareholder loan becomes uncollectible, you may be able to claim a bad debt deduction. However, the treatment depends on whether it’s classified as a business or nonbusiness bad debt.
Nonbusiness Bad Debt (Most Common)
For most individual shareholders and LLC members, shareholder loans are treated as nonbusiness bad debts:
Tax Treatment:
- Deductible as a short-term capital loss
- Claimed in the year the debt becomes wholly worthless
- Subject to capital loss limitations ($3,000 per year against ordinary income)
- Excess losses can be carried forward indefinitely
Requirements to Claim:
- The debt must be bona fide and enforceable
- You must demonstrate the debt is wholly worthless (no reasonable expectation of repayment)
- You need proper documentation of the loan
- You should show evidence of collection attempts
- The debt must have actually become worthless during the tax year
Business Bad Debt (Rare for Investors)
If you can prove the loan was made in the course of your trade or business, it may qualify as a business bad debt:
Tax Treatment:
- Deductible as an ordinary loss (more favorable)
- Not subject to capital loss limitations
- Can offset any type of income
Requirements:
- The lending activity must be part of your regular business
- Simply being a shareholder isn’t enough
- Professional lenders or financial businesses typically qualify
- The burden of proof is on you to establish business purpose
Partial vs. Whole Worthlessness
Important Rule: For nonbusiness bad debts, you can only claim a deduction when the debt becomes wholly worthless. If it’s only partially worthless, you must wait until it becomes completely uncollectible.
Planning Tip: Document the exact timing when the debt becomes worthless—this might be when the company files for bankruptcy, dissolves, or when you’ve exhausted all collection efforts.
Common Mistakes That Invalidate Shareholder Loans
Avoid these pitfalls that can cause the IRS to disregard your shareholder loan:
1. No Written Documentation
Relying on informal agreements or verbal promises won’t hold up under IRS scrutiny.
2. Below-Market Interest Rates
Charging zero interest or below AFR triggers imputed interest rules and suggests the arrangement isn’t true debt.
3. Missing or Irregular Payments
If the company never makes interest payments or skips payments without formally amending the note, it looks like equity.
4. Debt-to-Equity Ratio Problems
Excessive shareholder loans relative to equity investment (thin capitalization) can cause the IRS to reclassify debt as equity.
5. Subordination to All Creditors
If your note is subordinated to all other creditors to the point where repayment is unlikely, it may be treated as equity.
6. Backdating Notes
Creating promissory notes after the fact (especially after tax filing) is a red flag for the IRS.
7. Lack of Business Purpose
Loans made solely to create tax deductions without legitimate business purpose may be challenged.
Step-by-Step: Creating Your Shareholder Promissory Note
Step 1: Determine the Loan Amount
Calculate how much basis increase you need to deduct anticipated losses.
Step 2: Check Current AFR Rates
Visit IRS.gov to find the applicable federal rate for your loan term and loan date.
Step 3: Draft the Promissory Note
Include all nine required elements, using language that mirrors commercial loan agreements.
Step 4: Execute Properly
Both parties sign, date, and retain original copies.
Step 5: Transfer Funds
Document the actual transfer of money from shareholder to company (wire transfer, check, etc.).
Step 6: Record on Books
Ensure the company accountant records the loan as debt on the balance sheet.
Step 7: Make Payments on Schedule
Set up automatic payments if possible to ensure compliance with terms.
Step 8: Issue Tax Forms
Company issues Form 1099-INT for interest payments; shareholder reports on Schedule B.
Step 9: Maintain Documentation
Keep all records for at least 7 years in case of audit.
FAQs About Shareholder Promissory Notes
Can I loan money to my S corp without a promissory note?
While you can advance money informally, you won’t receive debt basis increase without a proper promissory note meeting all IRS requirements. Informal advances may be treated as capital contributions (equity) rather than debt.
What interest rate should I use?
Use at least the applicable federal rate (AFR) for the month the loan is made and the term of the loan. You can charge higher than AFR, but never lower without triggering imputed interest rules.
Do I need to charge interest on shareholder loans?
Yes, for tax purposes. If you don’t charge at least the AFR, the IRS will impute interest income to you anyway under IRC Section 7872, and the loan may not qualify as bona fide debt.
Can I forgive the loan if the company struggles?
You can forgive the loan, but there are tax consequences. The forgiven debt may be cancellation of debt (COD) income to the company, and you may be able to claim a bad debt deduction. Consult a tax professional before forgiving any shareholder debt.
How do I prove a loan is worthless for bad debt deduction?
Document efforts to collect, bankruptcy filings, dissolution of the entity, lack of assets, and any other evidence showing no reasonable expectation of repayment. The key is demonstrating the debt became worthless during the specific tax year you’re claiming the deduction.
What’s the difference between S corp debt basis and LLC basis?
S corporations have separate stock basis and debt basis, with specific rules about direct loans from shareholders. LLCs taxed as partnerships use outside basis rules under IRC Section 752, which generally allow more types of liabilities to increase basis, including entity-level debt.
Can I create a promissory note retroactively?
This is extremely risky and heavily scrutinized by the IRS. Contemporaneous documentation is critical. Creating notes after the fact, especially after the tax year ends, can result in the IRS disallowing the debt basis increase entirely.
Do I need a lawyer to draft my promissory note?
While not legally required, consulting with a tax attorney or CPA is highly recommended. The cost of professional guidance is minimal compared to the tax benefits you’re trying to preserve and the potential cost of an IRS challenge.
Summary: Required Elements Checklist
Before finalizing your shareholder promissory note, verify it includes:
✅ Written, signed document by both lender and borrower
✅ Definite principal amount clearly stated
✅ Fixed maturity date or repayment schedule
✅ Adequate stated interest (minimum AFR)
✅ Unconditional promise to pay
✅ Security/collateral provisions (recommended)
✅ Commercially reasonable terms (default provisions, attorney fees, etc.)
✅ Legal enforceability under applicable state law
✅ Proper recordkeeping and payment history
Conclusion: Protect Your Tax Benefits with Proper Documentation
Shareholder promissory notes are powerful tools for S corporation shareholders and LLC members to increase tax basis and maximize deductible losses. However, the IRS holds these arrangements to strict standards.
By ensuring your promissory note meets all nine essential requirements, charging adequate interest, making payments according to terms, and maintaining meticulous records, you protect your ability to claim valuable tax deductions both during the business’s operation and if it ultimately fails.
The stakes are high—improper documentation can result in denied deductions, tax deficiencies, interest, and penalties. Given the complexity of tax basis rules and the variations between S corporations and LLCs, consulting with a qualified tax professional before structuring shareholder loans is essential.
Ready to maximize your tax benefits? Review your existing shareholder loans against this checklist, and if you’re planning new advances to your S corporation or LLC, ensure your promissory note meets all requirements before transferring funds.
Disclaimer: This article provides general information and should not be construed as legal or tax advice. Tax laws are complex and subject to change. Always consult with a qualified tax professional or attorney regarding your specific situation before making any decisions about shareholder loans or claiming tax deductions.
