Private lending between friends and family members is one of the most financially dangerous things you can do — not because the people involved are bad, but because almost no one does it correctly. Every year, billions of dollars change hands informally across kitchen tables and text messages in the United States, and the overwhelming majority of these transactions are structured in ways that guarantee someone gets hurt: financially, relationally, or both.
If you’re going to lend money privately — or borrow it — you need to understand the legal, tax, and asset protection realities that most people only discover after things go wrong. This guide covers what actually matters.
The Single Most Important Decision: Is It a Loan or a Gift?
Before a dollar changes hands, both parties must be brutally honest about what this transaction actually is. If you lend $50,000 to your brother and you know in your gut he’ll never pay it back, that’s a gift — and the IRS will likely agree. The distinction matters enormously because loans and gifts live in completely different tax universes.
A bona fide loan requires a genuine expectation of repayment, a written promissory note, a stated interest rate, a repayment schedule, and consistent enforcement. Without these elements, the IRS can reclassify your “loan” as a gift, triggering gift tax reporting obligations under Form 709 if the amount exceeds the annual exclusion ($18,000 per recipient in 2024). Worse, if you charge no interest or below-market interest, the IRS imputes interest under Section 7872 of the Internal Revenue Code using the Applicable Federal Rate (AFR). You’ll owe income tax on interest you never actually received. That’s not a hypothetical — it’s the default rule.
The golden rule of private lending applies here with full force: never lend money you cannot afford to lose permanently. If default would cause you financial hardship, you cannot afford this loan, period.
Structuring the Loan: Documentation That Actually Protects You
A handshake agreement is worth exactly nothing in court. Every private loan needs a written promissory note that includes, at minimum:
- The principal amount and date of disbursement
- An interest rate at or above the current AFR (published monthly by the IRS)
- A specific repayment schedule with due dates
- Late payment penalties and default provisions
- Security or collateral, if any
- Governing state law and dispute resolution mechanism
For loans exceeding $10,000, charging at least the AFR isn’t optional — it’s required to avoid imputed interest problems. For loans of $10,000 or less, there’s a de minimis exception, but only if the borrower’s net investment income stays under $1,000. Don’t assume you qualify; document everything regardless.
Pay by check or wire transfer — never cash. You need a paper trail that proves the funds were transferred and received. If a dispute ends up in court, the judge will want to see documentary evidence of every element of the transaction.
When the Loan Involves Real Property: Co-Ownership Traps
Private lending gets exponentially more complex when real estate is involved — whether you’re co-signing a mortgage for a friend or co-buying property together. Here are the critical realities most people miss:
Joint and Several Liability
On a shared mortgage, the lender can pursue either borrower for 100% of the debt. Not half. Not their “fair share.” All of it. If your co-borrower stops paying, you owe the entire balance. This is the single most misunderstood fact in co-ownership, and it destroys relationships and credit scores with ruthless efficiency.
The DTI Anchor Effect
A co-signed mortgage counts 100% against each co-borrower’s debt-to-income ratio on every future loan application — even if the other person makes every payment. Want to buy your own home five years later? That co-signed mortgage is still sitting on your credit profile like an anchor, and most lenders won’t care that you’re not the one writing the checks.
Tenants in Common vs. Joint Tenancy
If friends or non-married partners buy property together, Tenants in Common (TIC) is almost always the correct title structure. TIC allows unequal ownership shares, independent inheritance rights, and no forced right of survivorship. Joint tenancy, by contrast, means the surviving owner automatically inherits the deceased owner’s share — which is fine for married couples but can produce nightmarish results among friends, especially when one party’s family expected to inherit their share.
Community Property State Risks
In community property states — California, Arizona, Texas, Nevada, Washington, Idaho, Louisiana, New Mexico, and Wisconsin — if your co-owner later marries, their spouse may acquire a community property interest in the home. Your co-ownership agreement should include a clause requiring any future spouse to waive claims against the property. A prenuptial agreement covering the asset is also worth discussing, uncomfortable as that conversation may be.
The Co-Ownership Agreement You Actually Need
Buying property with someone without a co-ownership agreement is like getting married without discussing money — it feels fine until it isn’t. The agreement should address:
- Right of first refusal: If one party wants to sell, the other gets the first opportunity to buy their share at fair market value.
- Shotgun clause: One owner names a price; the other must either buy at that price or sell at that price. This mechanism forces honesty because you don’t know which side of the deal you’ll end up on.
- Exit timeline: What happens if one owner wants out and the other doesn’t? Set maximum timelines for buyout or forced sale.
- Shared expense account: A joint account funded proportionally for mortgage, insurance, taxes, and maintenance — not one person Venmoing the other and hoping the math works out.
- Renovation and improvement consent: No one spends more than an agreed threshold without written consent from all owners.
- Occupancy rules: Who lives there, whether subletting is allowed, and what happens if someone moves out.
Tax Realities: Form 1098 and the Deduction Fight
IRS Form 1098 — the mortgage interest statement — is issued under one Social Security number. Only the person listed receives the form, even if both owners are paying. Co-owners must agree in writing on how to allocate the mortgage interest deduction. Ideally, the primary borrower on the 1098 should be the person who benefits most from the deduction — typically whoever has higher taxable income and itemizes deductions. Failing to sort this out before closing virtually guarantees a tax-season argument.
For private loans not involving real property, lenders must report interest income received. If you’re the lender, that interest is ordinary income reported on your tax return regardless of whether you receive a 1099. And if the borrower defaults permanently, you may be able to claim a nonbusiness bad debt deduction — but only as a short-term capital loss, subject to the $3,000 annual deduction limit, and only if you can prove the debt is genuinely worthless and was a real loan from inception.
State-Level Variations That Can Blindside You
Private lending law varies significantly by state. Statutes of limitations on written contracts range from four years (Texas) to ten years (some Midwest states). Some states use deeds of trust rather than traditional mortgages, which affects foreclosure procedures and timelines. Usury laws — maximum allowable interest rates — differ dramatically: California caps most personal loans at 10%, while other states have no meaningful cap. Charging interest above your state’s usury limit can void the entire loan and expose you to penalties.
The Bottom Line: Protect the Money and the Relationship
If you take away one thing from this guide, let it be this: informality is the enemy. Every undocumented loan is a future lawsuit, a family rift, or a tax problem waiting to happen. Draft a promissory note. Charge at least the AFR. Transfer funds electronically. If real property is involved, get a co-ownership agreement, choose TIC, and make sure title insurance is in place — it protects against defects in the title chain that could render your ownership worthless, and it’s a closing cost that earns its keep. Consult an attorney in your state before signing anything. The few hundred dollars you spend on proper documentation now will save you tens of thousands — and possibly a relationship — later.
Disclaimer: The information provided in this article is for informational purposes only and should not be considered financial or legal advice. Laws and lending criteria vary significantly between states. We always recommend consulting with a qualified real estate attorney and financial advisor before entering into a property purchase or financial arrangement with another party.
