Lately, many people in the forums are discussing buying a home but find themselves short on the down payment and consider borrowing from family or friends. This is a common situation. However, it’s always wise to keep things clear, even with loved ones. A formal loan agreement is essential. It’s not just about protecting both parties, but also about avoiding potential tax issues down the line! Today, I’m sharing a checklist and template for a private loan agreement that I’ve put together, hoping it helps those in need.
Why is a contract essential?
Many people might think, “We’re family, why do we need a contract? It feels so distant.” That’s a huge mistake! In Spain, without a formal private loan agreement, the tax agency (Hacienda) could classify the money as a “gift” (donación) and impose a high gift tax on the recipient! However, a loan agreement that specifies a 0% interest rate, when properly registered with the tax office, is completely tax-exempt. Therefore, the primary purpose of this agreement is to prove to the tax authorities that this is a loan that must be repaid, not a gift. This is just as crucial as other legal documents like the Deposit Agreement.

Core Clauses of the Contract
A proper loan agreement doesn’t need to be overly complex, but the following core elements must be clearly stated. I’ve created a simple table to make it easier to understand:
| Clause | Description & Notes |
| Lender & Borrower Information | Full names, NIE/DNI numbers, and residential addresses of both parties. |
| Loan Amount | Clearly state the total loan amount. It’s advisable to write it in both numerals and words (in Spanish). |
| Interest Rate | This is crucial! Even for an interest-free loan between family, you must explicitly state: “El tipo de interés es del 0%” (The interest rate is 0%). |
| Repayment Plan | Specify the repayment method, start date, loan term, and the amount of each installment (e.g., monthly). |
| Purpose of the Loan | It is best to specify that the funds are for the purchase of a property located at a specific address. |
| Date and Place of Signing | The city and date where the contract is signed. |
Tax Registration
Once the contract is signed, you’re not done yet! The most crucial step is to register it at the tax office of your autonomous community. You need to fill out the Modelo 600 form and submit the loan agreement as an attachment. This process falls under the ITP-AJD tax, but because it’s a 0% interest loan, it is “tax-exempt” (exento), meaning you don’t have to pay a single cent. However, the act of filing is mandatory! Remember, it’s “exempt but requires filing,” not “exempt therefore no filing needed”—these are two completely different concepts! After filing, the tax office will provide you with a stamped receipt. This document must be kept safely with the contract for any future tax inspections.
Finally, a quick reminder: the information above is based on personal experience and serves as a template reference only; it does not constitute legal advice. Everyone’s situation is different, especially when dealing with large sums or complex terms, so it’s always best to spend a little money to consult with a professional lawyer or tax advisor. Wishing everyone a smooth home-buying journey in Spain! Feel free to discuss and share your experiences here!