Many investors close on rental properties in November or December and assume depreciation starts when the first tenant moves in. A common misconception is that the clock starts at move-in. For investors who pair a December purchase with a cost segregation study, that assumption can cost thousands in first-year deductions.

The IRS does not require a tenant. It requires that the property is ready and available for its intended use. A vacant property purchased on December 15 can still qualify for depreciation that year, as long as it is ready and actively held out for rent, and a cost segregation study can turn that partial-year deduction into a significant tax benefit.

This article breaks down the placed-in-service rules, shows the math behind December purchases, and explains how to document your property for maximum first-year savings.

The "Placed in Service" Standard: What It Actually Means

The IRS lets you begin depreciating rental property "when it is ready and available for rent," according to IRS Publication 527. For rental real estate, that means the property is in a condition to accept tenants and is being offered for rent. It does not mean a tenant has signed a lease or moved in.

A property generally meets this standard when you complete basic repairs, connect utilities, make the unit habitable, and hold it out for rent. In the example in Publication 527, depreciation begins when the owner advertises the property, and it is available, even before a tenant moves in.

This distinction matters because depreciation begins in the tax year the property is placed in service. A December closing on a move-in-ready property that you list for rent starts the depreciation clock immediately. A property that needs a full renovation before it can be rented is not placed in service until that work is complete.

The difference between these two scenarios can shift tens of thousands of dollars in deductions from one tax year to the next.

Does "ready and available" mean the property has to be listed for rent?

The property does not need a signed lease, but it does need to be genuinely held out for rent. Depreciation starts on the later of the date the property is rent-ready and the date it is first held out for rent, so a December closing on a ready unit still needs the listing or management agreement in place before December 31. Publication 527's own example turns on the property being advertised and available. Listing the unit, signing a property management agreement, or documenting your intent to rent all strengthen your position. Keep records of any advertising, management agreements, or landlord insurance that reflect rental use.

December Closings and First-Year Depreciation

Residential rental property (a 27.5-year recovery period) uses the mid-month convention. The IRS treats the property as placed in service at the midpoint of the month the property is placed in service.

A December 15 placed-in-service date gives you a half-month of standard depreciation. Assume a $500,000 property. Land value is not depreciable and must be excluded based on an appraisal or assessor ratio. Using an 18% land allocation for this example leaves a depreciable basis of $410,000.

Using the IRS mid-month table for a December placed-in-service date, the first-year straight-line deduction is about $623 ($410,000 × 0.152%). The MACRS percentage tables appear in IRS Publication 946.

That number looks small. It is small. But it only tells part of the story.

The components a cost segregation study reclassifies, 5-year, 7-year, and 15-year property, use the half-year convention, not mid-month. On its own, the half-year convention treats an asset as placed in service at the midpoint of the tax year regardless of purchase date. A bigger factor applies here, though: these shorter-lived components qualify for 100% bonus depreciation, so they are fully deductible in year one whether you close in January or December.

One caveat applies if you are not using bonus depreciation on every component. If more than 40% of the depreciable basis of the personal property you place in service during the year lands in Q4, the mid-quarter convention applies instead. Your CPA should confirm which convention applies to your situation.

How Cost Segregation Multiplies the December Benefit

Here is where cost segregation changes the math, even for a property with zero rental income in December.

Cost segregation studies typically reclassify 20-35% of the depreciable basis into 5-, 7-, and 15-year recovery periods, depending on property type. For this example, assume 28%, which equals $114,800 in accelerated components.

Here is the comparison.

Without cost segregation: about $623 in first-year depreciation (half-month on the $410,000 basis at 27.5 years).

With cost segregation and 100% bonus depreciation: the $114,800 in reclassified components qualifies for full first-year expensing under bonus depreciation. The One Big Beautiful Bill Act restored permanent 100% bonus depreciation for qualified property acquired after January 19, 2025. The remaining $295,200 stays on the 27.5-year schedule, adding about $449 for the partial December period.

Total first-year deduction with cost segregation: about $115,249.

Total first-year deduction without: about $623.

In our $500,000 example, cost segregation raises the first-year deduction from about $623 to roughly $115,249. At a 37% marginal federal rate, that difference is worth about $42,000 in first-year federal tax, but only if you can use the loss.

Rental losses are generally passive. Passive activity loss rules can suspend them unless you qualify as a real estate professional or meet the short-term rental exception. State conformity also varies, and many states do not follow federal bonus depreciation, so your state benefit may be smaller.

There is one more trade-off to plan for. Accelerated depreciation is recaptured when you sell, so weigh your expected holding period before you accelerate. And because 100% bonus depreciation is now permanent, waiting a year does not erase the deduction; it simply defers the benefit and gives up the time value of claiming it sooner.

What You Need to Document

The IRS may ask you to prove the property was placed in service in the year you claim depreciation. Keep these records:

• Closing Disclosure (or settlement statement): Confirms purchase date and cost basis.
• Property photos: Show the property was habitable and ready for tenants at closing.
• Landlord insurance binder: A policy effective at closing demonstrates rental intent.
• Marketing materials or listing agreements: Prove you held the property out for rent.
• Utility activation records: Show the property was functional.

A virtual site visit with your cost segregation firm also creates timestamped documentation of the property's condition. It serves double duty: it supports your study and helps establish the placed-in-service date.

Plan Your December Purchase for Maximum Benefit

• Vacancy does not stop depreciation, but the property must be ready and held out for rent. The IRS standard is "ready and available for rent," not occupied.
• 100% bonus depreciation, restored permanently by the One Big Beautiful Bill Act, lets reclassified 5-, 7-, and 15-year components be fully expensed in year one.
• In our $500,000 example, cost segregation lifts the first-year deduction from about $623 to roughly $115,249, worth about $42,000 in federal tax at a 37% rate if you can use the loss.
• Passive activity loss rules may defer your deduction unless you qualify as a real estate professional or use the short-term rental exception.
• Accelerated deductions are recaptured when you sell, so match the strategy to your holding period.
• Document everything: Closing Disclosure, photos, listing records, and landlord insurance protect your deductions.

See what a December purchase could save you; get a free cost segregation proposal before year-end.

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