The Part Nobody Writes Down (And Why It Matters)

Most undocumented family loans are fine. The money moves, the trust holds, payments happen more or less on schedule, and eventually it all works out. Nobody ever thinks about the paperwork they didn't do.

But when a family loan goes wrong — really wrong, the kind that costs money or strains relationships or shows up in an estate — it almost always goes wrong in the same specific way.

Nobody wrote anything down.

Not the amount. Not the rate. Not what "pay me back when you can" was supposed to mean in practice. Just a conversation, a bank transfer, and the mutual assumption that this is the kind of thing families work out.

That assumption is usually right. Here's when it isn't.

The IRS situation

The tax question is the one people worry about most, so let's handle it first.

If the IRS ever examines a family financial transaction — because of an audit, an estate proceeding, a divorce, a Medicaid application — they look for evidence that a real loan existed. What they look for is straightforward: a written agreement, a stated interest rate, a payment schedule, actual payments being made.

If those things don't exist, they may decide it wasn't a loan. It was a gift. And gifts above the annual exclusion limit (currently in the high teens of thousands of dollars per year, per recipient — it adjusts for inflation most years) require a filing, and large cumulative gifts eat into your lifetime gift-tax exemption.

For most families, this is still not a disaster. The lifetime exemption is in the millions. But it means paperwork you weren't expecting, at a moment that's usually already stressful. (The IRS tends to show up at estate time. Not great timing.)

There's also the interest question. Loans above $10,000 technically require an interest rate at or above the IRS's Applicable Federal Rate — their published minimum for a loan of a given length. No rate stated, and they can impute income to you: tax you on interest you never collected. We've covered the full AFR picture here — for most families, it's a much smaller deal than it sounds. The short version: write a rate down, and the question disappears.

The relationship situation

This is the one that actually happens.

Money has a way of changing shape in people's memories. Not because of dishonesty — just because of time. What the lender remembers as a $20,000 loan, the borrower, five years later and a few life events in, may remember differently. As a gift. As something that was understood to be forgiven. As "you gave my sister that money and never asked for it back."

None of this requires bad intentions. It just requires time and the normal drift of human memory.

A written record doesn't mean you don't trust your kid. It means you both agreed on the same terms at the same moment, and there's something to point to when memories diverge. That's a kindness, not an accusation. The families that skip the paperwork are betting that their memories will stay in sync over however many years the loan runs. That's a long time to bet on.

The Medicaid situation (the one nobody sees coming)

This one surprises people.

Medicaid has a five-year lookback on asset transfers. If a parent lends money to a child without documentation — no agreement, no payment record — and that parent later applies for Medicaid nursing home coverage, the undocumented transfer may be classified as a gift. Gifts within that five-year window can affect eligibility.

This isn't an obscure edge case. It happens to normal families all the time. The loan was made years ago with the best intentions, nothing was written down because it was family, and now a nursing home is involved and the paperwork that didn't exist suddenly matters enormously.

Document the loan. Track the payments. Keep the records. Not because you expect a nursing home. Because you don't.

The fix, which is simpler than the problem

None of this is complicated to avoid.

A written agreement with the loan amount, the interest rate (we've got a full guide on what to include — the short version is five things, fifteen minutes), and a payment schedule is almost always enough. Something both people sign. Something both people keep somewhere findable.

Then: log the payments. Every one. Date, amount, method.

The families that do this almost never think about their family loan again. It just runs. Payments happen. The balance ticks down. At the end, it hits zero and everyone moves on.

Write it down. Charge a reasonable rate. Track the payments.

That's the whole job.

BankOfGaga handles the setup, the math, and the record — so both the lender and the borrower can see the current state of the loan at any time, without digging through texts or bank statements. Try it free for 3 days →

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Nothing here is legal or tax advice. If your loan is large, part of an estate plan, or involves a Medicaid situation, talk to a lawyer or CPA. They're inexpensive relative to what they save you.