Buying Your Mom’s House With FHA? Here’s the Rule That Could Cost You 15% Down Instead of 3.5%
The relationship that makes this deal easy is exactly what triggers extra scrutiny.
I worked with a client buying a duplex from her own mother using FHA and Hometown Heroes assistance — a genuinely good deal for everyone involved. But any time buyer and seller already know each other, FHA has a specific rule that needs to be addressed head-on, not discovered halfway through underwriting. It doesn’t kill the deal. It just changes the down payment math unless you know which exception applies to you.
An FHA “identity-of-interest” transaction is a sale between parties with an existing family or business relationship — including buying from a parent, sibling, employer, or a landlord you currently rent from. By default, these transactions are capped at 85% loan-to-value, meaning a 15% down payment instead of FHA’s standard 3.5%. Specific exceptions restore the standard 3.5% down payment, most commonly when you’re buying a family member’s actual primary residence, or when you’ve rented the specific property for at least six months before signing the contract.
Buying from family or a landlord you already know?
Let’s confirm which exception applies before this becomes a down payment surprise.
Check My Identity-of-Interest StatusWhat Actually Triggers This Rule
HUD defines an identity-of-interest transaction broadly: any sale between parties with an existing family or business relationship. That includes buying from a parent, sibling, or other relative, buying from your employer, buying from a business partner, and — a big one people miss — buying the home you currently rent from your landlord.
The Exceptions That Restore Standard 3.5% Down
| Exception | Requirement |
|---|---|
| Family member’s primary residence | You’re buying a family member’s actual principal residence — not a rental property they happen to own |
| Tenant purchase | You’ve rented the specific property for at least 6 months immediately before signing the contract |
| Builder’s employee | Purchasing a new or model home from your builder-employer |
| Corporate relocation | Purchase is tied to an employer-sponsored relocation program |
Notice what’s specific about the family exception: the property has to be the family member’s primary residence. If you’re buying a rental property or a second home from a relative, that specific exception doesn’t apply, and the 85% LTV limit likely does.
The Real Dollar Impact
On a $300,000 purchase, the difference between 3.5% and 15% down is stark: $10,500 versus $45,000 — a $34,500 gap in cash needed at closing. That’s the entire reason identifying your correct exception status matters before you’re financially committed to a purchase price and closing date.
What to Do If You’re in This Situation
- Disclose the relationship immediately — don’t wait for the underwriter to discover it. Hiding a known relationship risks a denied loan or a fraud flag.
- Confirm which exception, if any, applies to your specific situation before writing an offer.
- Expect a more thorough appraisal — identity-of-interest deals often get extra scrutiny since there’s no open-market competition establishing the price.
- Gather documentation early — a letter explaining the relationship, proof of occupancy (if claiming the tenant exception), or proof the property is a family member’s primary residence.
👪 FHA Identity-of-Interest Down Payment Checker
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Start My FHA Family PurchaseFAQ: FHA Identity-of-Interest Transactions
Does buying from any family member trigger the 85% LTV rule?
It can, but there’s a specific exception: if the property is that family member’s actual primary residence, the standard 3.5% down payment can still apply.
What if I’ve been renting the home from my landlord and want to buy it?
If you’ve rented that specific property for at least 6 months immediately before signing the purchase contract, the tenant-purchase exception can restore the standard 3.5% down payment.
Does an identity-of-interest transaction mean I’ll be denied?
No — it doesn’t disqualify you from an FHA loan. It typically means a larger down payment (unless an exception applies) and additional underwriting scrutiny, not an automatic denial.
What if I’m buying an inherited property or one transferred through a divorce decree?
Properties transferred through inheritance or legal arrangements like a divorce decree generally don’t trigger identity-of-interest limitations, especially when no money changes hands.
Do I need to disclose the relationship if the underwriter might not notice?
Yes, always. Disclosing the relationship upfront is required — failing to do so risks a denied loan or a fraud flag discovered later in the process.