Setting the Right Interest Rate for a Family Loan: Avoiding the "Gift Tax" Trap

When you're lending money to a family member, the "interest rate" conversation is always a bit awkward. On one hand, you want to help them out—that’s the whole point! On the other hand, you aren't a charity, and the IRS has some very specific opinions on how much you should be charging.

Setting the right rate isn't just about picking a number out of a hat. It’s about balancing three things: your own costs, your family member's goals, and the "Tax Man" lurking in the corner.

Here is how to find that "Fairness Sweet Spot."

1. Start with Your "Cost of Capital"

Before you look at what the banks are charging, look at where the money is coming from.

If the money you’re lending is sitting in a 0.10% savings account, you aren't "losing" much by lending it out. But many family lenders pull from other sources, and that’s where you need to be careful.

• The HELOC / Margin Loan Rule: If you are borrowing from a Home Equity Line of Credit (HELOC) or a brokerage margin loan to fund this family loan, you are paying a variable interest rate to the bank. Your family loan rate should almost always equal or exceed what you are paying. If your HELOC is at 8% and you lend to your son at 4%, you are essentially paying for the privilege of lending him money.
• The Opportunity Cost: Even if the cash is "just sitting there," could it be earning 5% in a high-yield CD or money market? Taking a lower rate is fine, but you should both acknowledge that the difference is part of the "gift" you’re giving them.

2. The IRS "Floor" (The AFR)

The IRS generally doesn't believe in "0% interest" for significant loans. If you charge too little, the IRS might decide that the interest you didn't charge was actually a gift. This is called "Imputed Interest," and it can lead to a surprise tax bill.

To stay safe, you need to charge at least the Applicable Federal Rate (AFR).

• How it works: Every month, the IRS publishes the minimum interest rates you must charge for a loan to be considered a "real" loan rather than a "gift."
• The Categories: The rates change based on how long the loan lasts (Short-term for under 3 years, Mid-term for 3-9 years, and Long-term for 9+ years).

Current Rates: Because these rates change every single month, we don't list them here. You can always find the most current, official minimum rates directly on the IRS Index of Applicable Federal Rates.

3. The "Fairness Range"

So, where is the sweet spot? Most successful family loans land in a "Middle Ground" that looks like this:

Example: Helping with a Down Payment

Imagine your daughter is buying a house. A bank might charge her 7% for a mortgage. The IRS minimum (AFR) might be 4%.

• If you charge 4%, she saves a massive amount of money over 30 years.
• If you charge 5.5%, she still saves money, and you earn a better return than you would in a savings account. It’s a win-win.

Summary: A Simple Rule of Thumb

When setting your rate, ask yourself these two questions in order:

1. "Am I losing money?" (Ensure the rate is at least what you are paying for the capital).
2. "Is the IRS happy?" (Ensure the rate is at least the current AFR).

As long as you hit those two marks, the rest is just family preference.