Real Estate Tax Calc
How co-ownership works on Schedule E: each owner files separately
A vacation rental owned by two or more people is not a single tax entity — it is a co-ownership (tenancy in common or joint tenancy) where each owner has a proportionate undivided interest. Each co-owner reports their share of income and expenses on their own Schedule E, as a percentage of the total matching their ownership interest. A 50/50 co-ownership means each owner reports 50% of gross rents, 50% of deductible expenses, and 50% of depreciation.
What differs between co-owners is the personal use day count. The number of fair rental days and personal use days on each owner's Schedule E depends on who used the property and their relationship to each other — and the §280A family-member rule can produce very different outcomes than many co-owners expect.
The family-member personal use rule explained
When two siblings co-own a beach house and both visit for personal vacations, the tax math is not simple addition of "your days." Under §280A(d)(2)(B), use of the dwelling by a "member of the taxpayer's family" is personal use by the taxpayer. Family for this purpose means the §267(c)(4) definition: spouse, brothers and sisters (including half-siblings), ancestors (parents, grandparents), and lineal descendants (children, grandchildren).
So if Sibling A visits for 10 days and Sibling B visits for 12 days, each sibling's Schedule E must count 22 personal use days — not 10 or 12 respectively. Both siblings are family members of each other. The 22-day combined total goes on both returns. The fair rental days (actual days rented at market rent) are reported the same way on both returns: each files their proportionate 50% of whatever income and expenses the property generated.
Unrelated co-owners: a different analysis
When co-owners are not family members — for example, two friends who buy an Airbnb together as an investment — the §280A family-member rule does not apply. Each unrelated co-owner counts only their own personal use days. Friend A's 10 vacation days at the property do not add to Friend B's personal use count on Friend B's Schedule E, as long as Friend A pays Friend B (or the shared account) fair market rent for those days. If Friend A does not pay fair market rent, then Friend A's days count as Friend A's own personal use but do not affect Friend B's Schedule E.
Unrelated co-owners can therefore have entirely different §280A outcomes on the same property. Friend A might have 20 personal use days (triggering residence status) while Friend B has 0 personal use days (pure investment rental). They each file their own Schedule E with different fair-rental-day and personal-use-day counts, different proration methods, and different rules on loss deductibility — all for the same physical property.
Worked example: siblings co-owning a Florida beach condo
Facts: Two siblings, Dana and Alex, co-own a Florida beach condo 50/50. During 2026, the condo is rented to paying tenants at fair market rent for 55 days. Dana uses it personally for 10 days. Alex uses it personally for 14 days. No other person uses it. Total fair rental days: 55. Total personal use days attributable to each co-owner: 10 + 14 = 24 days.
Step 1 — Does residence status apply?
For each sibling: personal use = 24 days. Fair rental days = 55.
10% of 55 = 5.5 days → round to 6. The threshold is the greater of 14 or 6, so the threshold is 14 days.
24 personal use days > 14. Both Dana's and Alex's condo is a "residence" under §280A for 2026.
Step 2 — Consequence: loss limit applies to both.
Rental losses cannot exceed rental income for a residence-status property. If the condo generates $8,500 in gross rent and $11,200 in expenses (including depreciation), the $2,700 loss is disallowed and suspended — it is not carried forward to future years, it is simply lost. Each co-owner can deduct only up to their 50% share of rental income against their 50% share of expenses.
Step 3 — Expense proration.
For a residence, the IRS method is required: allocate shared expenses (mortgage interest, insurance, utilities) by rental days ÷ total days of use.
Total days of use = 55 fair rental + 24 personal = 79 days
Rental allocation percentage = 55 ÷ 79 = 69.6%
Deductible rental portion of shared expenses: 69.6% × shared expenses.
Each co-owner then applies their 50% ownership to get their share.
Contrast — if personal use were only 10 days total (Dana 5, Alex 5):
10 personal days < 14-day threshold. The condo is NOT a residence. Losses are deductible (subject to passive-activity rules) and carry forward if limited. The Tax Court proration method (rental days ÷ 365) is available, potentially allowing more of the shared expenses to be treated as personal and itemized.
What counts as "personal use" for co-ownership purposes
Under §280A(d)(2), the following are personal use days for the taxpayer (applied to each co-owner separately):
- Any day the taxpayer uses the property for personal enjoyment.
- Any day a family member (§267(c)(4): spouse, siblings, ancestors, lineal descendants) uses it — regardless of whether rent is paid to the taxpayer.
- Any day any person uses it under a reciprocal use arrangement (I use your cabin, you use my beach house).
- Any day any person uses it at below fair market rent — but this counts as the paying occupant's personal use, not the other co-owner's, unless they are family.
What is NOT personal use:
- Days spent solely on repairs or maintenance — these are neither rental days nor personal use days.
- Days rented at fair market rent to any person, including a family member who pays full market rent.
- Vacant days (the property is unoccupied, listed or not listed) — these days count as neither rental nor personal.
Depreciation on a co-owned vacation rental
Each co-owner depreciates their proportionate share of the building's basis over 27.5 years. When the property qualifies as a residence under §280A, depreciation is prorated between rental and personal use using the IRS method (rental days ÷ total days of use). The personal-use portion of depreciation is nondeductible and does not add to the adjusted basis that reduces gain at sale.
Depreciation that is disallowed in a year due to the residence-status loss cap is not simply lost — it is carried forward under the specific ordering rules of §280A(c)(5). The carryover is subject to the same income limit in future years; it does not automatically become deductible when the property is eventually sold (unlike suspended passive losses from a pure rental).
How to split income and expenses between co-owners
Each co-owner's Schedule E shows their ownership-percentage share of:
- Gross rental income
- Deductible rental expenses (after proration for personal use)
- Depreciation (also prorated)
- Net rental income or loss (before passive-activity limits)
Expenses paid solely by one co-owner — say, one sibling pays for a repair — are still split at the ownership percentage on each Schedule E if the property is treated as a partnership for expense-sharing purposes. In practice, most family vacation rental co-ownerships are not formal partnerships, so each co-owner deducts only the expenses they actually paid. Coordinate which bills each owner pays and keep clear records to avoid double-counting or missed deductions.
Recordkeeping for co-owned vacation rentals
Because personal use days drive the §280A residence analysis — and because two co-owners' days interact — the most important record is a single shared calendar visible to both owners and their tax preparers. Mark every occupied day as: (1) paying tenant at market rent; (2) personal use by any owner or family member; (3) maintenance visit only; or (4) vacant.
Keep the booking records (Vrbo or Airbnb platform reports, lease agreements, Venmo/Zelle payment receipts for private rentals) to prove the fair rental days. For personal use, a shared calendar note — even a brief text saying "Alex at beach house June 10–17" — is contemporaneous evidence that holds up far better than a reconstructed recollection during an IRS examination. The IRS specifically scrutinizes vacation properties in beach and ski destinations for the §280A analysis.
Frequently asked questions
Does my co-owner's personal use affect my Schedule E?
If the co-owner is a family member (spouse, sibling, parent, child, grandparent, grandchild), yes — under IRC §280A(d)(2)(B) their personal use days count as your personal use days. If the co-owner is an unrelated person who uses the property free of charge, those days count on the unrelated co-owner's return but not yours. An unrelated co-owner who pays fair market rent does not trigger personal use on anyone's return.
How do two co-owners each file Schedule E for a shared vacation rental?
Each co-owner files their own Schedule E reporting their proportionate share of rental income, deductible expenses, and depreciation. Each counts their own applicable personal use days (including family member days) to run the §280A residence test on their own return. Two unrelated co-owners can have different outcomes; two family co-owners must count combined days.
What is the §280A residence test for a co-owned vacation rental?
The property is a "residence" for a co-owner if that owner's personal use days (including applicable family member days) exceed the greater of 14 days or 10% of their fair rental days. If the threshold is crossed, rental losses above rental income are disallowed in that year (not carried forward), and the IRS expense-proration method is required.
Can co-owners have different Schedule E outcomes on the same property?
Yes, if they are unrelated. Two unrelated co-owners with different personal use patterns may land on opposite sides of the §280A residence test, allowing one to deduct rental losses while the other is capped. Two family co-owners must count combined personal use, so they typically share the same §280A outcome.
How should co-owners track personal use days?
Keep a shared contemporaneous calendar noting every occupied day: paying tenant at market rent (fair rental day), personal use by any owner or family member, maintenance-only visit, or vacancy. Both co-owners and their tax preparers should have access to the same log. Platform reports from Vrbo or Airbnb establish fair rental days; personal use needs an independent log because platforms do not capture owner stays.
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.