Can I deduct mortgage interest on a vacation home that I rent out part-time in Florida? Yes, you can deduct the mortgage interest, but only the portion that corresponds to the days the property is rented out at fair market value. Personal use days do not qualify for the deduction, and you must allocate expenses between rental and personal use according to IRS guidelines. The deduction is reported on Schedule E, and any excess interest that exceeds rental income limits may be carried forward or subject to passive activity loss rules.
Why the Allocation Matters
The Internal Revenue Service treats a vacation home that is used both personally and for rental as a mixed‑use property. Tax law allows you to deduct expenses only for the rental portion. If you claim the full mortgage interest without allocating, the IRS could disallow the excess, assess penalties, and charge interest on the underpayment.
Determining Rental vs. Personal Use Days
You must keep a detailed log of each day the property is used. The IRS defines:
- Rental day: Any day the home is rented at fair market value to a tenant.
- Personal day: Any day you, your family, or friends use the property for vacation, even if you charge rent below fair market value.
- Repair/Maintenance day: Days spent on substantial repairs or improvements do not count as either rental or personal use.
At year‑end, calculate the percentage of rental use:
Rental Use % = (Number of Rental Days) ÷ (Total Days Used for Rental + Personal Use)
Only this percentage of mortgage interest, property taxes, insurance, utilities, and depreciation can be deducted on Schedule E.
Step‑by‑Step Allocation Example
Assume you own a condo in Miami with the following 2024 usage:
| Category | Days |
|---|---|
| Rental days (fair market rent) | 120 |
| Personal use days (family vacation) | 45 |
| Maintenance/repair days | 10 |
| Total days considered | 165 |
Rental Use % = 120 ÷ 165 = 0.7273 → 72.73%
If your annual mortgage interest paid is $12,000, the deductible portion is:
$12,000 × 0.7273 = $8,728
You would report $8,728 on Schedule E, line 10 (mortgage interest). The remaining $3,272 is non‑deductible personal interest.
Reporting on Schedule E
Schedule E (Supplemental Income and Loss) is used for rental real estate. The key lines are:
- Line 3: Rental income received.
- Line 10: Mortgage interest (allocate as shown).
- Line 14: Other expenses (property taxes, insurance, utilities, repairs, depreciation) – also allocated by the same percentage.
- Line 21: Total expenses.
- Line 26: Net rental income or loss.
If the rental activity results in a loss, you must evaluate passive activity loss (PAL) rules. Generally, rental real estate losses are passive and can only offset other passive income unless you qualify as a real‑estate professional or your modified adjusted gross income (MAGI) is below $100,000 (with a special $25,000 allowance that phases out).
Florida‑Specific Considerations
Florida has no state income tax, so you will not owe state tax on rental income. However, you must still:
- File a Florida corporate tax return if the property is owned through a corporation or LLC taxed as a corporation.
- Pay any applicable local tourist development taxes (often called "bed taxes\)) on short‑term rentals.
- Collect and remit sales tax on rentals of six months or less (Florida’s 6% state sales tax plus any discretionary sales surtax).
These taxes are separate from the federal mortgage interest deduction but affect overall profitability.
Limits and Phase‑Outs
Two federal limits may affect your deduction:
- Mortgage Interest Deduction Limit: For mortgages originated after December 15, 2017, the interest on up to $750,000 of acquisition debt is deductible. If your loan exceeds this amount, only the interest on the first $750,000 counts.
- Passive Activity Loss Limitation: If your MAGI exceeds $150,000, the $25,000 rental loss allowance begins to phase out, disappearing completely at $200,000 MAGI. Any disallowed loss carries forward to future years.
Example: A taxpayer with $180,000 MAGI and a $5,000 rental loss can only deduct $12,500 of the loss (($25,000 – ($180,000‑$100,000)×0.5) = $12,500). The remaining $2,500 is suspended.
Documentation You Should Keep
The IRS may request proof of your allocation. Maintain:
- A calendar or log showing each day’s use (rental, personal, maintenance).
- Copies of rental agreements, invoices, and payment receipts.
- Mortgage statements showing interest paid.
- Property tax bills, insurance premiums, utility bills, and receipts for repairs.
- Depreciation schedule (if you claim depreciation).
Store these records for at least three years from the date you file the return, or longer if you file a claim for a loss.
Common Mistakes to Avoid
- Claiming 100% of interest: Forgetting to allocate based on rental use.
- Misclassifying personal days: Using the property for a friend’s stay at below‑market rent still counts as personal use.
- Overlooking depreciation: Depreciation is a valuable non‑cash deduction; ensure you calculate it correctly (27.5‑year residential rental property).
- Ignoring state/local taxes: Even though Florida has no income tax, tourist development and sales taxes still apply to short‑term rentals.
- Failing to file Schedule E: Reporting rental income on Schedule C or omitting it altogether can trigger audits.
When to Consult a Tax Professional
If any of the following apply, consider seeking advice from a CPA or enrolled agent:
- You own multiple vacation homes with mixed use.
- Your rental activity generates a significant loss you wish to offset against other income.
- You are unsure whether you qualify as a real‑estate professional.
- You have recently refinanced or taken out a home‑equity line of credit on the property.
- You plan to convert the property to full‑time rental or primary residence.
A professional can help you navigate PAL rules, maximize depreciation, and ensure compliance with Florida’s tourist tax requirements.
Conclusion
You can deduct mortgage interest on a Florida vacation home that you rent out part‑time, but the deduction must be limited to the rental portion of the property. By accurately tracking rental versus personal days, applying the correct allocation percentage to interest and other expenses, and reporting the results on Schedule E, you stay compliant with IRS rules while maximizing your tax benefit. Remember to observe the federal mortgage debt limit, passive activity loss restrictions, and Florida‑specific tourist and sales taxes. Proper documentation and, when needed, professional guidance will keep your vacation rental both enjoyable and tax‑efficient.