Renting to a Family Member at Below-Market Rent: IRS Rules and Schedule E

Who counts as a "family member" under §280A

The definition of family member under §280A(d)(3)(A) is narrower than many landlords assume. The statute covers:

• Spouse
• Siblings — brothers, sisters, and half-siblings
• Ancestors — parents and grandparents (upward lineage)
• Lineal descendants — children and grandchildren (downward lineage)

In-laws, cousins, aunts, uncles, nieces, and nephews are not covered by §280A's family member definition. If your niece rents your property at below-market rates, those days are not automatically personal use days under §280A — though a separate argument could be made under the "less than fair market rent" branch of §280A(d)(2), which applies to any occupant paying below-market rates, not just family.

Related-party rules under IRC §267 can create additional complexity for transactions between siblings and other relatives in certain contexts, but for Schedule E purposes, the §280A family-member test is the controlling definition.

Why below-market rent equals personal use days on Schedule E

Schedule E Part I requires you to report "fair rental days" — the number of days the property was actually rented at fair market rent — and "personal use days." These numbers drive two things: expense allocation and loss deductibility.

When a family member occupies the property at any rent below fair market value, those days are personal use days rather than fair rental days. The amount of rent they pay is still income — you include whatever you collect — but the expenses for those days are not rental deductions. Instead they are personal expenses, some of which may be deductible on Schedule A (like mortgage interest and property taxes) but none of which reduce Schedule E rental income.

The practical impact: if you own a property with $15,000 of annual expenses (interest, taxes, depreciation, insurance) and your child occupies it for four months at below-market rent, roughly one-third of those expenses become non-deductible personal costs, and only two-thirds are deductible rental expenses against the rent you collect from unrelated tenants the other eight months.

The 14-day / 10% threshold and what happens when you cross it

Once you start accumulating personal use days, the 14-day / 10% rule determines how severely those days affect your return. Under IRC §280A(d)(1), if your personal use days for the year exceed the greater of:

• 14 days, or
• 10% of the number of days the property was rented at fair market rent

…then the property is classified as a residence. When residence status applies:

• Rental losses are completely disallowed — deductions cannot exceed rental income, and excess is not carried forward.
• You must use the IRS allocation method (§280A) to prorate expenses, which tends to push more cost into the deductible rental bucket than the Tax Court method.
• Interest and property taxes for personal use days are still deductible on Schedule A.
• Other personal-use expenses (depreciation, insurance, repairs for personal days) are simply lost.

The threshold matters most for vacation properties or second homes rented to family part of the year. A property occupied by a child for five months at below-market rent — 150 days — would have 150 personal use days. Unless you also have at least 1,500 fair rental days (10% of 1,500 = 150), and unless 150 is under 14 — which it isn't — the property is a residence and losses are capped.

When renting to family at fair market rent is fully allowed

The §280A family-member rule has an explicit exception: if a family member pays fair market rent, the days count as fair rental days, not personal use days. The logic is that the IRS cares about economic substance — if the relative is paying what anyone else would pay, there is no tax-motivated discount and no reason to penalize the transaction.

What "fair market rent" means in practice: the rent charged must be at or reasonably near what an unrelated person would pay for a comparable unit in the same market. It does not require exact equality — a small concession for a reliable family tenant is unlikely to trigger scrutiny — but a 30-50% discount from market clearly fails the test.

If you charge fair market rent to a family member and report it properly on Schedule E, the arrangement is treated the same as any other rental. You deduct all ordinary rental expenses, claim depreciation, and can report a rental loss subject to the passive-activity rules. The family relationship is irrelevant once fair market rent is established.

Worked numeric example: two scenarios

You own a two-bedroom condo. Comparable units in the neighborhood rent for $1,800 per month. Your expenses: mortgage interest $8,400, property taxes $2,400, insurance $900, depreciation $4,500, maintenance $800 — total $17,000 per year. You want your daughter to live there.

Scenario A: Below-market rent ($900/month, half of market)

Your daughter pays $900/month for 12 months = $10,800 of rent income. But because $900 is below fair market value, all 365 days are personal use days. You have zero fair rental days.

• Rental income to report: $10,800 (you still include what you collected)
• Deductible rental expenses: $0 — all 365 days are personal
• Mortgage interest ($8,400): deductible on Schedule A (itemized)
• Property taxes ($2,400): deductible on Schedule A
• Insurance, depreciation, maintenance: personal expenses, not deductible anywhere
• Net taxable income on the $10,800: potentially $10,800, since you have no rental deductions to offset it on Schedule E

Scenario B: Fair market rent ($1,800/month)

Your daughter pays $1,800/month for 12 months = $21,600 of rent income. All 365 days are fair rental days.

• Rental income: $21,600
• Deductible rental expenses: $17,000
• Net rental income: $21,600 − $17,000 = $4,600
• All expenses fully deductible; depreciation clock running

Scenario A produces more apparent cash in the landlord's pocket ($10,800 received, nothing owed on deductions), but the tax outcome is worse: $10,800 of income with zero offsetting deductions. Scenario B produces higher rent ($21,600), and the full $17,000 of expenses reduces the taxable amount to $4,600 — a far better after-tax position even though the nominal rent is higher.

Mixed-use year: family occupancy plus unrelated tenants

Many landlords rent to family for part of the year and to unrelated tenants at market rate for the rest. In this case, you tally each type of day separately:

• Fair rental days: days rented to unrelated parties at market rent
• Personal use days: days occupied by family members at below-market rates (or any occupant below market)
• Vacant days: neither category

You then allocate expenses between rental and personal use. The IRS allocation method — expenses × (rental days ÷ (rental days + personal use days)) — is required if the personal use days exceed the 14-day / 10% threshold. Below that threshold, you can use the Tax Court method (rental days ÷ 365), which typically allocates less to the rental column but allows more on Schedule A.

Example: Condo rented at market rate for 180 days, occupied by family at below-market for 90 days, vacant 95 days. Personal use days (90) exceed 14 and exceed 10% of 180 fair rental days (18), so residence status applies and the IRS method is required. Rental allocation = 180 ÷ (180 + 90) = 67%. Total deductible rental expenses = 67% × $17,000 = $11,390 — and that cannot exceed the rental income from the 180 market-rate days.

Setting a defensible fair market rent

If you want to rent to a family member and maintain full rental status, documenting fair market rent is essential. The IRS can challenge any arrangement where a relative pays below market, so having contemporaneous records is important.

Steps to establish fair market rent:

1. Search Zillow, Apartments.com, or a local property management company for three to five units similar in size, location, and condition to your property.
2. Note the listed rents and dates.
3. Set your rent at or near the midpoint of the comparable range. Document this in a simple file with screenshots or printed listings.
4. Use a written lease agreement — even for family — that states the rent, term, and payment schedule.
5. Collect rent by check or electronic transfer (not cash) so there is a paper trail.

If you cannot find comparables within about 10–15% of what you would charge a family member, the arrangement is almost certainly below market. A formal appraisal from a licensed property manager can provide stronger documentation if the rental market is unusual or if the property is unique.

What the IRS looks for on audit

Family rentals are a known audit trigger, particularly for vacation properties. Examiners look for:

• Rental income reported on Schedule E that seems low relative to the property's value or location
• Large rental losses from a property in a vacation area
• Matching the taxpayer's name to property records in a beach or mountain resort community
• No personal use days reported on a vacation property

The strongest defense is documentation: a written lease, electronic rent payments, a record of comparable rents at the time you set the rate, and a contemporaneous calendar showing which days were rented and to whom. If an examiner suspects a family discount, they will compare your reported rent to what the market was charging at the time.

Frequently asked questions

Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.

Related

• Fair Rental Days on Schedule E: What They Are and How to Count Them
• Vacation Home Tax Rules: Personal Use and the 14-Day / 10% Threshold
• Rental Property Depreciation Calculator