How to Document a Family Loan the IRS Will Respect

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An undocumented loan can be recharacterized as a gift. Documentation is what protects the whole arrangement.

An undocumented family loan is not a loan with missing paperwork. In the eyes of the IRS it may simply be a gift, and that recharacterization is retroactive, unilateral and expensive.

Why the IRS cares what you call it

Money moving between family members is presumed to be a gift unless there is evidence of genuine debt. That presumption exists for a sensible reason: absent proof, a “loan” that is never repaid is indistinguishable from a transfer of wealth, and treating it as debt would let families move unlimited amounts tax-free.

The burden of proof sits with the family. Documentation is how you meet it.

What a defensible loan actually contains

A promissory note is the core instrument, and it should record:

• Principal: the exact amount advanced, and the date it moved.
• Interest rate: at or above the Applicable Federal Rate for the correct term tier, fixed at origination.
• Repayment schedule: amounts and dates, or a clearly defined formula.
• Maturity date: a real one. Open-ended debt looks like a gift.
• Signatures from both parties, dated.
• Security, if any: for a property loan, a recorded mortgage or deed of trust materially strengthens the position and may matter for the borrower's interest deduction.

The part families skip

Here is what actually decides these cases: the note is necessary but not sufficient. What carries weight is evidence the loan behaved like a loan for its entire life.

• Payments that actually happened, traceable through bank records, on or near the scheduled dates.
• Interest reported. The lender includes interest received as income. A note charging interest that never appears on a tax return undercuts itself.
• A maintained balance showing principal reducing over time.
• Contemporaneous handling of changes. If terms are renegotiated or a payment deferred, that is written down when it happens, not reconstructed later.
• Any forgiveness recorded deliberately, measured against that year's annual exclusion.

A perfect note with no payment history is weak. A modest note with five years of clean, traceable repayment is strong.

The three failure modes

The handshake. Money moves, nothing is written, everyone privately holds a slightly different understanding. Years later at an estate, siblings discover they disagree about what it was.

The note in a drawer. A document was signed at origination and then nothing ever happened. No payments, no interest, no record. It reads as a gift with extra steps.

The schedule nobody follows. Terms exist but repayment drifted, and nobody documented why. This is the most common and the most fixable: a written amendment at the time costs nothing.

Why this protects the relationship too

Documentation is usually framed as tax defence. Its more valuable function is social. A written agreement means nobody has to remember, nobody has to interpret, and nobody has to raise it at dinner. The terms are settled and external.

Ambiguity is what damages families, and it is precisely what an undocumented transfer guarantees. See the relationship risk in family lending for more on that.

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General information, not tax or legal advice. Documentation requirements vary by situation and state. Work with your own attorney or tax adviser on a specific loan.