A CPA can only take the position your records support. The difference between a client who gets the full benefit of the short-term rental strategy and one who gets a hedged version is almost always what arrived in the tax folder, not what the CPA knows.
The average stay calculation
Your CPA needs booking-level data showing every reservation with its start and end date across the tax year, so the average period of customer use can be computed rather than estimated.
Most platforms export this. Pull the full-year transaction or reservation history from every channel you use, not just the largest one, and include direct bookings.
A summary figure you calculated yourself is not the same thing. The CPA needs the underlying data because the calculation has to be reproducible if the return is examined.
This is an explanation, not tax advice. My BnB Accelerator, LLC is a real estate acquisition firm, not a CPA firm. Work with a qualified professional. Our independent partner firm is AE Tax Advisors.
The participation log
The contemporaneous log with date, duration, task description and who performed each item, plus totals by person and by property.
Include hours for everyone else who worked on the property, including managers and cleaners. Two of the seven material participation tests depend on comparing your hours to everyone else's, and without their hours the comparison cannot be made.
Bring the log itself, not a total. A number without the underlying record is not something a CPA can rely on.
The financial records
- Gross revenue by month and by channel, including cleaning fees collected from guests.
- Platform fee statements and any 1099-K received.
- Every expense categorized: management, cleaning, supplies, utilities, insurance, property tax, HOA, repairs, software, travel.
- The closing statement from the purchase, which establishes basis.
- Loan documents and the annual interest statement.
- Furnishing and setup invoices, which are frequently depreciable separately.
- Capital improvement invoices, kept separate from repair invoices.
The repair versus capital improvement distinction matters and is frequently blurred by owners. A repair is generally deductible currently; an improvement is capitalized and depreciated. Keeping the invoices separate as you go is far easier than reconstructing the distinction in March.
Personal use days
Track every night you, your family, or anyone connected to you occupied the property, along with the purpose.
Personal use affects the deductibility of expenses and can affect the classification of the property entirely if it exceeds the thresholds. A property used personally for more than the greater of 14 days or 10% of the days rented at fair rental value falls into a different set of rules.
Days spent substantially full time on repairs and maintenance are generally not counted as personal use, but the documentation for that has to exist. Log the dates and the work performed.
The cost segregation study
If a study was done, the CPA needs the full report, not a summary. The report supports the component classifications and is the primary documentation if the position is examined.
If a study is planned but not yet complete, tell your CPA early. The timing of the study relative to the filing deadline and any extension matters, and a study arriving the week before a deadline creates avoidable pressure.
If you are considering a look-back study on a prior-year purchase, raise it well before year end. The change in accounting method has its own filing requirements.
What happens when records are missing
A CPA facing incomplete records has two choices, and both cost the client. They can take a conservative position, which means a smaller deduction and a smaller refund than the facts might have supported. Or they can take a position the records do not fully support, which transfers risk to the client.
Most competent CPAs choose the first, which is why clients with poor records consistently report that the strategy delivered less than expected. The strategy did not underdeliver. The documentation did.
The fix is a system rather than an effort. Weekly participation logging, monthly expense categorization, and a single folder that everything goes into as it arrives. Two hours a month through the year is dramatically less work than reconstructing twelve months in March, and it produces a materially better outcome.
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Frequently asked questions
What records does a short-term rental CPA need?
Booking-level reservation data for the average stay calculation, a contemporaneous participation log with hours for everyone including managers, full revenue and categorized expense records, the purchase closing statement, loan documents, personal use days, and the cost segregation report if one exists.
Why does my CPA need hours for my property manager?
Because two of the seven material participation tests compare your participation to everyone else's. Without the manager's and cleaners' hours, the comparison cannot be made and those tests cannot be demonstrated.
How do personal use days affect a short-term rental?
They affect expense deductibility, and exceeding the greater of 14 days or 10% of days rented at fair rental value moves the property into a different set of rules. Days spent substantially full time on repairs are generally not personal use, but need documentation.