Short-Term Rental Due Diligence Checklist: 12 Tax & Deduction Items to Verify Before You Close

Most short-term rental investors spend weeks analyzing nightly rates, occupancy percentages, and revenue projections from AirDNA or Rabbu. They spend approximately 15 minutes on the tax side — usually a quick conversation with their CPA after they're already under contract.

This is backwards. The Year 1 tax deduction from bonus depreciation is often the largest single economic event in the first year of STR ownership. For a property in the $600,000–$1,200,000 range, the difference between a high-depreciation deal and a low-depreciation deal can be $40,000–$100,000 in deductions — and $15,000–$37,000 in real federal tax savings at a 37% bracket. That number belongs in your deal analysis before you make an offer, not after you've already closed.

Here is the full tax and deduction due diligence checklist — 12 items, in the order you should actually work through them.

The 12-Item Pre-Close Tax Checklist

• 1
  Verify the average guest stay is under 7 days This is the foundational test. Under IRC §469(c)(2), a rental activity is classified as nonpassive — meaning losses can offset ordinary income including W-2 wages — when the average period of customer use is 7 days or fewer. Ask the current host or listing agent for platform data (Airbnb host dashboard, VRBO performance report) showing the trailing 12-month average length of stay. Cross-reference against guest reviews, which often indicate stay length. If the property has been operated as a longer-stay rental or furnished month-to-month, the classification may not transfer automatically — you'd need to reposition the operating model before Year 1 close to secure the nonpassive treatment.
• 2
  Pull county assessor land value — know your depreciable basis before LOI Land is not depreciable. It never enters the depreciation calculation. If the county assessor assigns 35% of a property's value to land, you are starting with only 65% of the purchase price as your depreciable basis before any bonus depreciation classification even begins. This single number — the land-to-value ratio — is the most important structural variable in your bonus depreciation estimate. Run the county assessor's website for the specific parcel before you submit a letter of intent. In high land-value markets (coastal, urban-adjacent), this number can make or break the depreciation economics. DepreciMax pulls assessor data automatically for any address — free with a property search.
• 3
  Check property age — newer builds produce more bonus-eligible components The year a property was built (or substantially renovated) is a reliable proxy for how clean the IRS component separation will be. Properties built after 2015 tend to use materials and construction methods that are more easily classified into 5-year personal property and 15-year land improvement categories. Older properties — particularly pre-2000 builds — often have embedded finishes (tile grouted into structural slabs, plumbing roughed into structural walls, HVAC integrated into building systems) that resist reclassification. A formal cost seg study or AI estimate on a 1998 property will consistently produce a lower bonus-eligible percentage than the same price point in a 2022 property, all else being equal. Build date after 2017 is a meaningful positive signal.
• 4
  Identify all outdoor amenities — pools, hot tubs, fire pits, pergolas, outdoor kitchens Outdoor amenities are the single largest driver of bonus depreciation variation across STR properties at the same price point. Under IRS cost segregation rules, these features classify as 15-year land improvements and qualify for 100% first-year bonus depreciation: in-ground or above-ground pools ($40,000–$85,000), hot tubs and spa systems ($12,000–$22,000), fire pits with gas line ($5,000–$10,000), outdoor kitchens and built-in grills ($20,000–$50,000), pergolas and shade structures ($8,000–$20,000), decorative paving and hardscaping, exterior lighting, fencing, and irrigation systems. Make a complete inventory from listing photos, the MLS sheet, and if possible a pre-inspection walkthrough. Each item that can be documented is a line item in your bonus eligible column.
• 5
  Photograph or request photos of all interior finishes — flooring, cabinetry, countertops, appliances Interior finish quality is the primary driver of 5-year personal property content. Luxury vinyl plank flooring (finish layer), stone and quartz countertops, custom cabinetry, frameless glass shower enclosures, decorative plumbing fixtures, high-end appliances (Sub-Zero, Wolf, built-in espresso machines, wine coolers), recessed lighting fixtures, smart home systems (Lutron, Control4), and AV/audio systems all classify as 5-year personal property. Builder-grade equivalents — laminate countertops, sheet vinyl flooring, stock cabinets — often classify as structural (39-year). Request interior photos specifically showing: kitchen finishes, bathroom finishes, flooring material, lighting fixtures, and any built-in technology. This is what a cost seg engineer analyzes on-site, and it's what our AI analyzes from your uploaded photos.
• 6
  Confirm whether the property is purchased with FF&E included Furniture, fixtures, and equipment (FF&E) that conveys with the sale adds directly to your 5-year personal property total — and it's often the fastest path to a meaningful additional deduction. A fully furnished short-term rental with quality furniture, linens, kitchen equipment, and entertainment systems typically adds $40,000–$90,000 in 5-year property to the analysis. Confirm with the listing agent and request an inventory list of what conveys. If FF&E is not included in the list price, ask — it's sometimes negotiable and the tax value of a $60,000 furniture package at a 37% bracket is a $22,200 tax reduction in Year 1, which often justifies paying more to keep it in the deal.
• 7
  Check state conformity — does your state conform to federal bonus depreciation? Federal bonus depreciation under IRS §168(k) is a federal tax benefit. Your state may or may not follow federal treatment. States that currently do not conform to federal bonus depreciation include California, New York, New Jersey, Illinois, Pennsylvania, and several others — each with its own add-back rules. If you invest in a property in Tennessee or Florida (both conforming states with no state income tax), your federal deduction flows through cleanly. If you are a California resident investing in a California STR, your state return will require an add-back of the federal bonus depreciation amount, and you'll owe California income tax on that income. This doesn't kill the strategy, but it reduces the net benefit by 9.3–13.3% (California's marginal rates). Confirm your state's conformity status with your CPA before closing.
• 8
  Verify zoning and STR permit — an active permit strengthens your IRS position An active, valid short-term rental permit in the property's jurisdiction is not technically required to claim the STR exception to passive activity rules — but it is a meaningful support document if the IRS ever examines your return. A property operating with a documented STR permit, a clear history of sub-7-day rentals on a regulated platform, and local government acknowledgment of its rental status presents a cleaner factual record than an unpermitted rental. Verify the permit status directly with the county or municipality — do not rely solely on the seller's representation. Also confirm whether the permit is transferable to a new owner or requires re-application, as some jurisdictions have permit freezes that can delay your first season.
• 9
  Calculate your material participation hours — will you hit 100 or 500 hours in Year 1? Material participation is required to treat STR losses as active rather than passive. The IRS provides seven tests; the two most commonly used for STR investors are: (1) you participate 500 or more hours during the year, or (2) you participate 100 or more hours and no one else — including a property manager, co-host, or any contractor — participates more hours than you. Before closing, sketch out a realistic first-year hour budget: guest communications, cleaning oversight, maintenance coordination, listing management, and direct involvement in the property. If you plan to use a full-service property management company with minimal personal involvement, the 100-hour test becomes difficult to satisfy. The 500-hour test requires documentation — start a contemporaneous log from day one. To learn more about the mechanics of the loophole, see our STR tax loophole explained guide.
• 10
  Get a preliminary land value estimate before making an offer Item 2 told you to pull the county assessor data. This item is about acting on it before your offer — not just noting it for later. If the assessor shows a 38% land ratio on the property you're evaluating, your depreciable basis is only 62% of purchase price. At a $750,000 offer, that's $465,000 in depreciable basis. Even a generous 25% bonus-eligible split produces only $187,500 in bonus eligible content — and the deduction will likely be lower because structural components eat the remaining depreciable basis. Compare this to a similar property with a 14% land ratio: $645,000 in depreciable basis and potentially $182,000 in Year 1 deduction. The land ratio alone can make one property dramatically better than another at the same price. Know it before you bid. DepreciMax surfaces assessor land value for every property in its search results — free.
• 11
  Run an AI depreciation estimate — know the approximate deduction range before your offer This is where the full picture comes together. An AI depreciation estimate synthesizes the land value data, property age, exterior amenity inventory, and interior finish analysis into a line-item estimate by IRS classification: 5-year personal property, 15-year land improvements, 39-year structural. The output gives you a Year 1 deduction range and a tax savings estimate at your marginal rate. With that number in hand, you can factor the deduction into your offer price, your hold period cash-on-cash calculation, and your CPA briefing. DepreciMax produces this estimate for $99 — you upload 7–9 listing photos plus the property address, and results are available in minutes. The estimate is calibrated to within ±5% of a formal cost segregation study, which costs $5,000–$15,000 and takes weeks. Running the $99 estimate before your offer is one of the highest-ROI actions in your pre-close diligence.
• 12
  Brief your CPA pre-close — send the AI report, confirm the deduction strategy, align on entity structure Your CPA should not be seeing this deal for the first time after closing. Send the DepreciMax report (or your research from items 1–11) to your tax advisor before you go under contract, and align on three things: (1) the deduction strategy — will you commission a formal cost seg study, rely on the AI estimate to set expectations, or use a combined approach? (2) entity structure — should this property be held personally, in an LLC, or in an S-corp? The answer affects self-employment tax exposure and the mechanics of how the bonus depreciation flows through to your return. (3) State conformity and any add-back requirements in your state. A 30-minute pre-close CPA call costs nothing if you're already a client, and it prevents the three most common post-close surprises: an entity structure that doesn't work for the deduction strategy, a state add-back no one anticipated, and a material participation position that wasn't documented from day one.

Timing Matters — When to Do Each Step

The 12 items above are not all equal-effort tasks, and they don't all need to happen at the same moment. Here is the phased approach that works best for most short-term rental investors:

The items most commonly skipped — and most consequential — are items 2 and 10 (land value before the offer) and item 9 (material participation planning). These are the areas where post-close surprises happen most often.

The Documents to Collect

Alongside the 12 checklist items, there is a parallel document collection task that supports both your pre-close analysis and your CPA's filing. Start collecting these during the due diligence period and have them organized before closing:

• County assessor parcel report — shows assessed value split between land and improvements. Print or screenshot for every property you seriously evaluate.
• Airbnb or VRBO performance data — trailing 12-month average length of stay, occupancy rate, and gross revenue. Request directly from the seller or current host.
• HOA documents (if condo or PUD) — financials showing total common area improvement costs, which support your pro-rata 15-year land improvement allocation.
• Property inspection report — the inspector's notes on HVAC, electrical, plumbing, and mechanical systems provide independent documentation of system age and condition, which supports your cost seg classification.
• Builder specifications or renovation records — if the property is new construction or recently renovated, original specs or contractor invoices document what was installed and at what cost. These are gold for a cost seg study.
• Appliance and fixture inventory — a room-by-room list of appliances, fixtures, and installed equipment, ideally with model numbers. This supports classification of high-value items like Sub-Zero refrigerators, Wolf ranges, and wine coolers as 5-year property.
• FF&E conveyance list — written confirmation from the seller of exactly what furniture, furnishings, and equipment conveys with the sale, with approximate retail replacement values where possible.
• STR permit documentation — current permit, permit number, and confirmation of transferability to new owner. Include any correspondence with the municipality about permit status.
• Current property tax bill — confirms the assessor's land/improvement split is reflected in actual tax assessments, not just estimates. Sometimes the assessed split for tax purposes differs from the market value split.
• DepreciMax AI report — your pre-offer line-item depreciation estimate. This becomes the brief for your CPA and the baseline against which a formal cost seg study is measured if you commission one post-close.

How to organize these documents

Create a simple folder structure — either in Google Drive, Dropbox, or a local folder — organized by property address. Sub-folders for: County Data, Platform Data, Property Docs, Financial Records, and Tax Analysis. Your CPA will thank you when they have a single organized package rather than 14 separate email attachments forwarded over three months.

If you are evaluating multiple properties simultaneously — which is common for investors who are actively deal-hunting — the discipline of running this checklist consistently across each deal is what allows you to compare properties on an apples-to-apples basis. Two properties at the same price point can have very different bonus depreciation profiles, as we showed in our analysis of cabin vs. condo vs. luxury home bonus depreciation.

One More Thing: This Checklist Is Not a Substitute for a CPA

Everything on this list is designed to help you arrive at a pre-close conversation with your tax advisor in a position of genuine readiness — not to replace that conversation. The bonus depreciation rules interact with passive activity rules, at-risk rules, entity structure choices, and state-level conformity in ways that require a qualified tax professional to navigate for your specific situation.

What this checklist does is ensure you're not walking into that conversation blind. You'll know the land ratio. You'll know the amenity inventory. You'll know the average stay data. You'll have an AI estimate of the Year 1 deduction. And you'll have a specific agenda for the CPA call rather than a vague question about "the tax benefits of short-term rentals."

That's the difference between a 30-minute pre-close CPA call that confirms your strategy and a 3-hour post-close scramble where you're trying to reconstruct information that should have been collected weeks ago.

Frequently Asked Questions