You don't need another tax "optimization" tool. You need clean records.
Every April, STR owners hand their accountants a year's worth of receipts, screenshots, and half-remembered hours, then pay by the hour to reconstruct what could have been built throughout the year in minutes a day.
This guide highlights 20 areas to track throughout the year so the deductions on your STR property survive April with your CPA. Those same records prove you materially participate, the test that unlocks the STR tax loophole. Paired with a cost segregation study and bonus depreciation, STR losses can offset your W-2 income. This is how owners run an STR portfolio like a business. DeductFlow is the one-stop STR tax software built to organize all twenty in one place.
What's inside
01
Property + Stay Records
5 items · p. 3
02
Hours & Active Participation
4 items · p. 4
03
Expenses by Category
7 items · p. 5
04
The Handoff to Your CPA
4 items · p. 6
DeductFlowSTR Tax Prep Checklist02 / 08
DeductFlowSection 01 · Property + Stay Records
01
Section 01 · 5 items
Property + Stay Records
The basic financial and occupancy ledger for each listing. Pull straight from the platforms, reconcile to your bank.
1
Annual gross revenue per property
Pull gross figures from your Airbnb, VRBO, and Hospitable dashboards. Gross of platform fees, not the net deposit that lands in your bank. Your CPA reconciles gross to net so the reported number ties to the platforms.
2
Average length of stay per booking
Track the average length of each guest stay across the year. This is the data your CPA uses to evaluate whether your property is classified as STR (under the 7-day rule) or as a long-term rental. The IRS test and the decision belong to them.
3
Days rented vs. days available vs. days of personal use
Log every night the property was booked, available but vacant, and used personally by you or family. Personal-use days are the line that disqualifies a lot of otherwise-clean STR positions, and the rules are technical. Hand your CPA the log, let them apply the rules.
4
Property basis records
Keep the purchase price, closing statement, and dated records of every capital improvement since acquisition. Your CPA uses these for depreciation calculations. If you've had a cost-segregation study completed, attach the full report.
5
Platform fees and pass-through cleaning fees
Track what the platforms withheld (host fees, service fees, processing) and the cleaning fees you charged guests separately from what you actually paid your cleaners. Gross revenue and net deposit live on different lines, and the cleaning pass-through is income to you and an expense to you in the same year.
DeductFlow · what we handle for this section
One ledger per property. No more spreadsheet.
Capture gross revenue, platform fees, occupied vs. available nights, and average length of stay for every property in a single ledger. Per-property tagging keeps each listing's numbers separate for your CPA. Cost-seg study PDFs upload to a dedicated document store. Capital improvement receipts attach to the expense entry that created them. Add a property, log income as you receive it, and the year-end roll-up is already done.
DeductFlowSection 02 · Hours & Active Participation
02
Section 02 · 4 items
Hours & Active Participation
The activity record that determines which IRS test your CPA applies. Build it as you go. Reconstruction in April is brittle and almost never holds up to a question.
6
Hours spent on STR-related activities
Log every meaningful chunk of STR-related work (cleaning, guest communication, maintenance, supply runs, listing updates) by date with a brief description. Your CPA evaluates these against the 100-hour test and the broader material participation tests under IRS §469.
7
Who did the work: you, your spouse, or a paid contractor
Note whether you (or your spouse, if filing jointly) handled each task or paid someone else. Work performed by paid contractors generally does not count toward your participation hours, and that distinction can decide which test you pass. Your CPA picks the test, your log feeds the answer.
8
Days you physically visited the property vs. managed remotely
Record on-site visits (drive time, hands-on work, in-person showings) separately from remote work (booking management, guest messages, ad updates). Both can count toward your hours, but the mix matters when your CPA is evaluating which test you pass.
9
Multi-property owners: hours per property, tracked separately
Multi-property owners should keep each property's hours in its own bucket. Aggregating into a single number is fine for your own dashboard, but your CPA needs the per-property breakdown to evaluate grouping elections under §1.469-4.
DeductFlow · what we handle for this section
Tap once. DeductFlow logs the hour.
A one-tap timer for cleanings, repairs, supply runs, and guest communications. Each entry is tagged by activity type, by who did the work, and by property. A live progress card tracks you against the 100-hour threshold all year, so you know in July whether April is going to be ugly. The hours log exports as a dated participation report your CPA can attach to the return.
DeductFlowSECTION 02 · HOURS & ACTIVE PARTICIPATION04 / 08
DeductFlowSection 03 · Expenses by Category
03
Section 03 · 7 items
Expenses by Category
Seven buckets your accountant will ask for line by line. Categorize at entry, let your CPA evaluate treatment.
10
Cleaning + supplies
Capture every cleaning invoice and supply purchase (paper goods, soaps, linens, replacements). Track the cleaning fees you charged guests separately from what you actually paid cleaners. Your CPA reconciles the two against revenue.
11
Repairs + maintenance
Log routine repairs (fixing a faucet, patching drywall) separately from improvements (new HVAC, kitchen remodel). Your CPA splits these. Repairs typically expense in the year incurred, improvements typically capitalize and depreciate.
12
Utilities
Electric, gas, internet, water and sewer. Keep monthly statements or annual summaries. If a utility is shared with a personal residence, note the allocation method so your CPA can apply it cleanly.
13
Mortgage interest, property tax, and insurance
Keep your annual mortgage interest statement (Form 1098), property tax bills, and insurance declarations page. These are large line items and your CPA wants the source documents, not screenshots or summary numbers.
14
Property management fees + booking platform fees
Property manager payouts and platform-side withholdings live on different lines. Track them separately. Platform fees come out of gross revenue, management fees sit as their own expense, and the year-end paperwork (1099-K from the platforms, 1099 from a management company that paid you) keeps them in different buckets.
15
Travel and mileage to/from the property
Log every trip with date, miles, and purpose (showings, repairs, cleaning runs, supply runs). The 2026 IRS standard business mileage rate is $0.725 per mile (Notice 2026-10). Your CPA decides actual-cost vs. standard-rate method and what qualifies as deductible business use.
16
Capital purchases: furniture, appliances, hot tubs, big-ticket items
Keep dated receipts for every purchase over $500 with the property it serves noted on each. Your CPA evaluates each for Section 179, bonus depreciation, the de minimis safe harbor, or standard capitalization.
DeductFlow · what we handle for this section
Snap, tag, categorize. DeductFlow logs it.
Snap a photo of any receipt and attach it to the expense in seconds. 19 expense categories that map to what your CPA expects, plus vendor-name auto-categorization so "Home Depot" doesn't sit in the wrong bucket. Repairs and capital improvements live in separate categories at entry, so reclassification in April becomes a non-event. Mileage logs in five seconds at the 2026 IRS rate of $0.725 per mile. Per-property roll-ups at year end, no spreadsheet.
DeductFlowSECTION 03 · EXPENSES BY CATEGORY05 / 08
DeductFlowSection 04 · The Handoff to Your CPA
04
Section 04 · 4 items
The Handoff to Your CPA
What your accountant actually wants in April. Deliver these four and the whole appointment shifts from reconstruction to review.
17
Year-to-date P&L per property, organized by category
Hand your CPA a clean per-property P&L, organized line by line, not twelve months of credit card statements. This is the single highest-leverage thing you can deliver in April. Your CPA decides which form it lands on.
18
Cost segregation study documentation, if completed
If you've had a cost-seg study done, attach the full report. The study reclassifies property components into shorter-life depreciation buckets (5, 7, and 15-year instead of 27.5-year), and your CPA uses those classifications to file. A study without the full report attached is not actionable.
A clean log of hours and activity types, annotated by date, so your CPA can evaluate which §469 material participation test you meet and document the position in the file. The contemporaneous log is what holds up if anyone ever asks.
20
Home office: square footage and chosen method
If you run your STR business from a dedicated home office, record the square footage and which method you're claiming. The simplified method allows $5 per sq ft up to 300 sq ft, a $1,500 cap. The actual-expense method applies your business-use percentage to mortgage interest or rent, utilities, insurance, and property tax for the year. The choice is annual and your CPA decides which is bigger.
DeductFlow · what we handle for this section
One click. One clean handoff.
A per-property P&L line by line, your cost-seg study attached, the hours log exported as a dated participation report, and your home office calculation set by method. The CPA Export bundles all four into a single PDF and CSV pair, ready to send to your accountant. No scavenger hunt the week before your appointment.
DeductFlowSECTION 04 · THE HANDOFF TO YOUR CPA06 / 08
DeductFlowHow DeductFlow handles the checklist
How this worksEvery checklist item has a home
How DeductFlow collects all 20 as you go.
DeductFlow exists for one reason: to give every item on the previous pages a home, so the year's data is already organized when April shows up. The map.
Feature
What it does
Checklist refs
Revenue Ledger
Per-property gross revenue, platform fees, and pass-through cleaning, entered manually or pasted from your host dashboards.
S1 · items 1 & 5
Stay Tracker
Average length of stay, rented nights, available nights, and personal-use nights, per property.
S1 · items 2 & 3
Document Uploads
Cost-seg study PDFs upload to a dedicated store on the Cost Segregation page. Closing statements and capital improvement receipts attach to the related expense entry.
S1 · item 4 + S4 · item 18
Hours Timer
One-tap timer that logs by activity, participant, and property. Live 100-hour progress card. Exports as a dated participation report.
S2 · all + S4 · item 19
Expense Categorizer
19 expense categories with vendor-name auto-categorization. Repairs and capital improvements live in separate categories at entry. Multi-property tagging.
S3 · items 10–14
Mileage Tracker
One-tap trip logging at the 2026 IRS rate ($0.725/mi). CSV import from Everlance if you already track elsewhere.
S3 · item 15
Capital Asset Log
Receipts, dates, amounts, and property assignments for every big-ticket purchase. Cost Segregation category for studied properties.
S3 · item 16
CPA Export
Year-end PDF and CSV per property, organized category by category, with mileage and hours logs attached.
S4 · item 17
Home Office
Simplified method ($5/sq ft, 300 sq ft cap) or actual-expense method with per-line household cost entry. Per-property assignment so the deduction lands on the right return.
S4 · item 20
DeductFlowHOW DEDUCTFLOW WORKS07 / 08
The next April starts now
Stop reconstructing tax season. Build it.
Every item on this checklist has a home inside DeductFlow. Set it up once, log as you go, hand your CPA a clean folder in April.
This checklist is for organization purposes. DeductFlow is a tracking and data-organization tool. It is not a tax advisor and does not provide tax advice. Consult a licensed CPA or tax professional for filing decisions.