Family Loan to Invest: 7 Rules Before You Sign

By The Chipkie Team, Personal Finance Editorial Team  ·  Last updated 11 October 2026

Borrowing from a parent or sibling to put money into the market feels simple. No bank, no credit check, no underwriting — just a transfer and a handshake. But a family loan to invest is one of the few arrangements that can damage both your portfolio and your Thanksgiving dinner in the same quarter. The money is leveraged, the downside is real, and the paperwork almost never exists until something goes wrong.

Here are the seven rules that matter before anyone wires anything — covering interest, the IRS, who absorbs a loss, and the one scenario where this structure gets refused outright.

Key Takeaways

• A family loan used to buy investments must charge at least the applicable federal rate (AFR) for that month, or the IRS can impute interest income to the lender.
• The gift tax annual exclusion is $19,000 per recipient per giver in 2026, and the lifetime gift and estate tax exemption is $15,000,000 per individual after the One Big Beautiful Bill Act.
• Borrowed money — including an informal family loan — is not an acceptable source of mortgage down payment funds under Fannie Mae and FHA rules unless it is secured against an asset.
• The agreement must state explicitly who bears the loss if the investment falls, because silence defaults to the borrower owing the full balance regardless of performance.
• Put it in writing. Statutes of limitations on written contracts run roughly four to ten years depending on your state; oral contracts are shorter and far harder to prove.

What does a family loan to invest actually commit you to?

It commits the borrower to repaying the full principal plus agreed interest regardless of what the investment does. A loan is not a partnership. If you borrow $50,000 from your father to buy shares and the position drops 40%, you still owe $50,000. Investment risk and repayment obligation are entirely separate things.

That distinction is the single most common misunderstanding we see. Families negotiate the amount and the rate, then never address the scenario that actually causes the conflict. There are three fundamentally different structures, and you need to pick one deliberately:

Mixing these up is where families end up in small claims court. If Mom thinks she bought 30% of your brokerage account and you think you took a loan, you have two incompatible stories and no document to settle them.

What interest rate do you legally have to charge?

At minimum, the applicable federal rate (AFR) published by the IRS for the month the loan is made and for the loan’s term. Charge less, and the IRS can treat the forgone interest as imputed income to the lender under Internal Revenue Code Section 7872 — meaning your parent owes tax on interest they never actually received.

The AFR changes every month and is published in three tiers:

• Short-term — loans of three years or less
• Mid-term — over three years, up to nine years
• Long-term — over nine years

Never rely on a rate you read in an article, including this one. Look up the current month’s figure directly at the Internal Revenue Service before you sign. A rate locked in at signing applies for the life of a fixed-term loan, which is why timing matters.

The lender also has a reporting obligation: interest actually received is taxable interest income. Our experience with the agreements users create is that this is the step families skip most often — see our guide to reporting family loan interest on your tax return for the mechanics.

Can you use a family loan for a home down payment instead?

No — not as an unsecured loan. Under the Fannie Mae Selling Guide (B3-4.3-15) and FHA rules, an unsecured personal loan, including an informal loan from a relative, is not an acceptable source of down payment funds. This is a source-of-funds prohibition, not merely a debt-to-income problem. Underwriting will refuse it.

This matters here because many people borrow from family “to invest” and then redirect the money to real estate. Two critical points:

1. Secured works, unsecured does not. Borrowed funds may be used for a down payment only when secured against an asset — typically a note and deed of trust recorded behind the first mortgage, at a reasonable rate. A properly secured family loan is a legitimate structure; a verbal IOU is not.
2. A false gift letter is mortgage fraud. A gift letter certifies the money is a gift with no expectation of repayment. If your family genuinely expects to be repaid and you sign one anyway, that is a false statement to a federally insured lender. This happens constantly, and rarely out of malice — but intent does not change the law.

Seasoning does not launder it either. Parking borrowed money in your account for 60 days does not make it yours if a repayment obligation exists. The Consumer Financial Protection Bureau publishes plain-language guidance on what lenders verify during underwriting.

What has to be in the written agreement?

An investment loan agreement between family members needs to answer the questions that only surface during a bad year. At minimum it should specify the principal, the rate tied to the correct AFR tier, the repayment schedule, and — critically — the loss allocation.

• Principal and disbursement date — the date drives which month’s AFR applies
• Interest rate and compounding — state the AFR tier used and whether interest accrues or is paid periodically
• Repayment terms — fixed monthly, interest-only with a balloon, or payable on sale of the investment
• Loss clause — say in plain words that the borrower repays in full even if the investment loses value, or state the alternative
• Collateral — unsecured, or secured against the brokerage account or other property
• Default and cure period — what counts as default, and how many days to fix it
• Death of the lender — whether the balance is forgiven by will or becomes an estate asset owed to siblings
• Prepayment — permitted without penalty, ideally

That last-but-one point ambushes families. If a parent dies with $60,000 outstanding and the will is silent, the note is an estate asset — and your siblings inherit a claim against you. Address it explicitly in both the note and the will.

What are the tax and gift consequences if the loan is forgiven?

Forgiving a family loan converts it into a gift in the year of forgiveness. In 2026 the annual exclusion is $19,000 per recipient per giver, so two parents can jointly forgive up to $38,000 to one child in a year without a filing. Amounts above that require Form 709 and draw down the $15,000,000 lifetime exemption.

Filing Form 709 does not mean tax is owed. For the overwhelming majority of families it simply records the amount against a lifetime exemption no one will ever exhaust. The real risk is the opposite error — forgiving payments informally, year after year, with no documentation, so the IRS can argue the “loan” was a disguised gift from day one and that no bona fide debt ever existed.

Three defensive habits:

1. Keep a running balance statement showing payments and outstanding principal.
2. Make payments by traceable transfer, not cash.
3. Document any forgiveness in writing in the year it happens, not retroactively.

Is lending money for shares riskier than lending for a car or tuition?

Yes, materially. A car or tuition loan is repaid from income. An investment loan is often expected to be repaid from the investment itself, so a market downturn removes the repayment source and the borrower’s ability to pay simultaneously. That correlation is what turns a manageable debt into a family dispute.

Who bears the loss on a family loan if the investment collapses?

Under a true loan, the borrower bears 100% of the loss and still owes the full balance. Only an equity arrangement shares losses proportionally. If your agreement does not say which structure applies, courts generally default to the loan interpretation, leaving the borrower fully liable.

Can the lender deduct the loss if the borrower never repays?

Potentially, as a non-business bad debt, but only if the loan was bona fide — written, with a real repayment schedule and a documented collection effort. Loans the IRS views as intra-family gifts get no deduction. Our overview of the non-business bad debt deduction covers the evidence required.

Does a family loan affect the borrower’s credit score?

Generally no, because private lenders do not report to Equifax, Experian, or TransUnion. That cuts both ways: on-time repayment builds no credit history, and default leaves no record. It also means the debt is invisible to future lenders unless the borrower discloses it, which they are obligated to do on loan applications.

What should you do before the money moves?

Agree on the structure first, the amount second. Then look up the current month’s AFR, write the note, and have both parties sign and keep a copy. If the funds will touch a property purchase in any form, talk to the mortgage lender before signing anything — not after.

A written note costs almost nothing and resolves nine out of ten family money arguments before they begin. You can create a clear, signed family loan agreement with Chipkie in minutes — with the interest terms, repayment schedule, and loss allocation spelled out, so nobody has to rely on memory of a conversation from three years ago.

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.