How to Track Third-Party Hours for the 100-Hour Rule

You can log every hour you spend on your rental with precision and still fail the 100-hour test because half of that test isn't about your hours at all. It's about proving no one individual worked more than you did. That means you need real numbers for your cleaner, contractor, and property manager, not just an assumption that you're probably ahead.

Why this is the part investors skip

Tracking your own hours is straightforward: you know what you did and roughly how long it took. Tracking someone else's hours feels intrusive, awkward to ask about, or simply outside your control. So, most investors either skip it entirely, or guess based on a vague sense of how often the cleaner shows up. Both approaches leave the second half of the 100-hour test completely undocumented, which means if the IRS ever asks, there's nothing to point to.

Method 1: Ask directly

The simplest approach is often the most effective. Most cleaners, contractors, and property managers will tell you their time if you explain why you're asking. Tell them this is for tax compliance, not a payment dispute or a performance review. A short, direct message asking how long a typical turnover or job takes is usually enough to get a workable number. It's worth asking periodically rather than once, since turnover time can shift with property changes or seasonal booking patterns.

Method 2: Use timestamp data you already have

If you have a smart lock, security camera, or check-in system, you likely already have check-in and check-out timestamps for cleaners and service providers without needing to ask anyone anything. Averaging that data over several turnovers gives you a reliable per-visit duration. Multiply that average by your total number of turnovers for the year, and you have a defensible estimate for cleaning hours specifically backed by data rather than a verbal estimate.

Method 3: Use vendor invoices

Invoices from contractors, landscapers, or maintenance providers often already list hours worked, especially for hourly-billed work. Keeping these on file does double duty by supporting expense deductions and documenting third-party time for the material participation comparison. If an invoice doesn't list hours explicitly, most vendors will add that detail if you ask, since it's a minor addition for them.

Method 4: Set a reasonable cap and stick to it

For any third party where you're estimating rather than measuring precisely, err toward a defensible, slightly conservative number rather than the lowest possible guess. The goal isn't to make third-party hours look artificially small, rather it's to have a number you can explain and stand behind if it's questioned. A cleaner's hours that turn out to be understated in an audit can undermine the third-party side of your log just as much as an inflated number would undermine your own.

Why this matters more with a property manager

If a property manager handles day-to-day logistics, their hours are likely to be substantially more than yours if you're not deliberate about where you spend your own time. This doesn't disqualify you automatically; it just means your own hours need to be concentrated in areas where you're genuinely more involved than the manager. This could be guest communication, pricing decisions, vendor selection, or financial review, rather than assuming the comparison will work out in your favor without tracking it.

If a property manager's time is likely to exceed what you can reasonably outpace, the 500-hour safe harbor test (which doesn't require the "more than anyone else" comparison) may be a more realistic path than trying to win the 100-hour comparison against a full-time manager.

Making the comparison visible as you go

Estimating third-party hours once a year, right before filing, means you find out whether you passed the comparison after it's too late to change anything. The more useful approach is tracking it continuously, so you can see where you stand well before tax season.

STR Audit Shield Pro's 3rd Party feature allows you to log cleaner, contractor, and property manager hours on the same footing as your own. It then compares them directly on your dashboard — showing your household's hours against your top third party in real time, rather than leaving that comparison as a year-end guess.

Know where you stand before tax season, not during an audit

STR Audit Shield Pro is the easiest and most cost-effective way to track and prove your material participation hours, including the third-party side most logs miss entirely, starting at $6/month.

The information provided in this guide is for general informational purposes only and does not constitute tax, legal, or financial advice. Always consult a qualified CPA, tax attorney, or financial advisor before making any tax, investment, or real estate decisions.