5-Year vs. 7-Year vs. 15-Year vs. 27.5-Year Property

A visual table of which assets fall into each MACRS recovery class, with simple examples for residential rentals. Why the class drives the timing benefit.

5-Year vs. 7-Year vs. 15-Year vs. 27.5-Year Property

What you'll learn. What lives in each MACRS recovery class, with a simple table you can scan in 30 seconds. The class drives both the depreciation speed and the bonus-depreciation eligibility.

The big picture

Under IRC §168, every depreciable asset gets assigned a recovery period — the number of years over which the cost is deducted. Cost segregation is, at its core, the work of moving items out of the long-life building bucket and into the short-life buckets. The shorter the life, the faster the deduction, the bigger the Year-1 tax effect.

The four buckets that matter for residential rental cost segregation:

| Class | Life | Method | Convention | Examples | | --- | --- | --- | --- | --- | | 5-year | 5 yrs | 200% DB | Half-year (or mid-quarter on Q4 buys) | Carpet, appliances, decorative lighting, removable flooring, custom cabinets, security systems | | 7-year | 7 yrs | 200% DB | Half-year (or MQ Q4) | Furniture, certain office equipment — rare in residential rentals | | 15-year | 15 yrs | 150% DB | Half-year (or MQ Q4) | Driveways, patios, fencing, landscaping, sidewalks, retaining walls, outdoor lighting | | 27.5-year | 27.5 yrs | Straight-line | Mid-month | Residential rental building shell | | 39-year | 39 yrs | Straight-line | Mid-month | Commercial / non-residential building shell |

(For commercial rentals, replace the 27.5-year row with 39-year. Everything else above remains the same.)

What goes in 5-year property

5-year is the workhorse class for residential cost segregation. It captures personal property under IRS Publication 946 — items that are removable, not structural, and have a useful life that genuinely tracks the 5-year mark.

Common 5-year items in a single-family rental:

• Kitchen: custom cabinets, granite/quartz countertops, built-in appliances, tile backsplash, decorative lighting
• Bathrooms: custom vanities, stone counters, upgraded fixtures, glass shower enclosures
• Flooring: hardwood, tile, vinyl plank — anything not glued or nailed as part of the structural floor
• Lighting: chandeliers, ceiling fans, recessed and under-cabinet fixtures
• Built-ins: shelving, entertainment centers, speaker systems
• Window treatments: built-in plantation shutters, motorized blinds
• Security systems and gas/wood/electric fireplaces

The IRS Cost Segregation Audit Techniques Guide Chapter 7.2 puts the typical 5-year reclassifiable share at 5–15% of depreciable basis for 1–4 unit residential rentals. Engineering-firm marketing pages quoting "20–30%" are often combining 5-year and 15-year classes and selecting on properties where a study made sense.

What goes in 7-year property

7-year is rare in residential rentals. It mostly captures office furniture, certain manufacturing equipment, and some agricultural assets. The cost-seg engine includes a 7-year line for completeness, but the typical residential allocation is well under 1% of basis.

Where 7-year shows up: commercial and apartment-complex properties with leasing-office furniture, conference-room equipment, and similar items.

What goes in 15-year property

15-year captures land improvements — things that are attached to the land but are not the building, and don't qualify as part of the natural land itself.

Typical 15-year items:

• Driveways, sidewalks, walkways
• Patios (concrete and pavers), wood and composite decks
• In-ground and above-ground pools, spas
• Fencing (wood, iron, vinyl, chain-link, stone)
• Landscaping (sod, plants, trees, irrigation)
• Outdoor lighting and landscape lighting
• Retaining walls, pergolas, outdoor kitchens

The cost-seg engine maps each questionnaire checkbox to one of these categories. A property with a pool, paver patio, professional landscaping, and a 200-foot wood fence will see a noticeably bigger 15-year allocation than a bare lot with a concrete driveway.

What stays in the 27.5-year (or 39-year) shell

The building shell — the structural elements that are part of the building itself — stays in 27.5-year (residential) or 39-year (commercial). This is the bulk of the basis on a typical property.

What stays in the shell:

• Walls, roof, foundation, framing
• Plumbing rough-in and HVAC ductwork that serves the entire building
• Structural windows and doors
• Permanent staircases
• Hardwired electrical service that powers the building shell

A useful test: if removing the item would damage the building's structural integrity or basic habitability, it stays in the building shell.

Why class life drives the bonus depreciation benefit

Bonus depreciation under IRC §168(k) applies only to property with a recovery period of 20 years or less. The 27.5-year and 39-year building shells are excluded. The 5-year, 7-year, and 15-year classes are eligible.

So the work of cost segregation is: identify the items that legitimately belong in 5-year, 7-year, or 15-year classes; move them out of the 27.5-year (or 39-year) shell; and apply 100% bonus depreciation (under OBBBA, for property acquired after January 19, 2025) to the reclassified basis. That's where the front-loaded Year-1 deduction comes from.

Run a screening to see how the classes split on a sample property →

The conventions in the table

• 200% DB (5-year, 7-year) — Double declining balance. Higher percentages in early years, tapering off.
• 150% DB (15-year) — One-and-a-half declining balance. Slower than 5-year but still front-loaded.
• Half-year (HY) — Treats all property as placed in service mid-year, regardless of actual purchase date.
• Mid-quarter (MQ) — Triggers under §168(d)(3) when more than 40% of personal-property basis is placed in service in Q4. For a single-property cost-seg, this means MQ applies on October–December acquisitions.
• Mid-month (MM) — For real property only. Treats property as placed in service mid-month of the actual acquisition month.

The MACRS percentage tables that drive the year-by-year deductions are in IRS Publication 946 Tables A-1 (HY) and A-5 / A-6 (MQ).

Sources

• IRC §168 — Accelerated cost recovery system
• IRC §168(d)(3) — Mid-quarter convention rules
• IRC §168(k) — Bonus depreciation (eligibility limited to ≤20-year property)
• IRS Publication 946 — How to Depreciate Property (Tables A-1, A-5, A-6)
• IRS Cost Segregation Audit Techniques Guide, Chapter 7.2 — Residential Rental

Disclaimer. This tutorial describes general federal tax concepts. TaxProtestTx (Nought Labs LLC) is a feasibility-screening tool, not tax advice or a cost segregation study. Calculator output cannot be relied on under Treasury Circular 230. Consult a qualified CPA, EA, or attorney before filing. Results are not guaranteed.