When you buy a home from your parents, sibling, or business partner, the mortgage process looks different. Lenders classify these as non-arm's-length transactions, and they come with tighter scrutiny and specific documentation requirements.
What qualifies as non-arm's-length
A non-arm's-length transaction occurs when buyer and seller have a pre-existing relationship that could influence the sale terms. This includes purchases from immediate family members (parents, siblings, children, spouses), business partners, employers or employees, and affiliated corporate entities. The concern is simple: related parties might agree to inflated prices, disguised gifts, or other arrangements that misrepresent the property's true value or the buyer's actual financial position. Lenders rely on accurate collateral valuations and genuine sales data, so these transactions get extra review.
Why lenders care
Mortgage underwriting assumes the sale price reflects fair market value negotiated between independent parties. When a buyer purchases from their mother for $400,000, the lender cannot assume that figure resulted from competitive negotiation. The price might include a $50,000 gift disguised as purchase price, or it might exceed the home's actual worth to help the seller. Either scenario affects loan-to-value ratios, equity calculations, and default risk. Lenders also watch for straw-buyer schemes where a related party acquires property on someone else's behalf to circumvent qualification standards.
Documentation requirements
Expect stricter documentation. The lender will order an independent appraisal and scrutinize it closely—if the appraised value comes in below the contract price, you may need to cover the difference in cash or renegotiate. You'll provide a detailed explanation of the transaction and your relationship to the seller. If any portion of your down payment or closing costs comes from the seller as a gift of equity, that must be documented according to the loan program's gift rules, with a signed gift letter stating the funds are not a loan and require no repayment. Some programs limit gift-of-equity amounts or require the buyer to contribute a minimum from their own funds. Consult a CPA or attorney; this is not tax or legal advice.
Program restrictions
Conventional loans generally allow non-arm's-length transactions but may impose higher down-payment requirements or limit gift-of-equity contributions depending on occupancy and loan-to-value. FHA loans permit them with full gift-of-equity down payments in many cases, though documentation standards are strict. VA loans typically allow transactions between family members. Investment-property and second-home loans often face tighter restrictions or outright prohibitions. Some portfolio and non-QM lenders decline non-arm's-length transactions entirely.
The Alliance take
Buying from family can make financial sense, but transparency is essential. Disclose the relationship to your loan officer immediately—discovered later, it can derail your approval. Document everything: appraisals, gift letters, proof that any cash changing hands matches what's disclosed. If you're considering a purchase from a relative or business associate, start an application early so we can walk you through the specific documentation your situation and loan program require.