Cost Segregation Residential Rental 2026 Calculator
Cost segregation residential rental 2026 reclassifies portions of a building into 5-year, 7-year, and 15-year recovery property. With the 2026 bonus depreciation rate of 40%, owners can front-load deductions and beat MACRS straight-line on NPV — but face §1245 ordinary recapture on personal property and §1250 unrecaptured gain on the building when they sell.
| 27.5-year building portion | — |
| 5-year personal property (§1245) | — |
| 7-year personal property (§1245) | — |
| 15-year land improvements | — |
| Year 1 deduction comparison | |
| Cost seg + 2026 bonus (Year 1) | — |
| MACRS straight-line (Year 1) | — |
| Year 1 advantage | — |
| Recapture on sale (Year ' + ' ) | |
| §1245 ordinary recapture (5/7/15-yr) | — |
| §1250 unrecaptured gain (25% cap) | — |
| Recapture tax at sale (est.) | — |
Cost segregation residential rental in 2026 is the IRS-blessed practice of carving a building into shorter-life components: 5-year personal property (appliances, carpet, decorative lighting), 7-year personal property (some office furniture), and 15-year land improvements (driveways, landscaping, fencing) — leaving only the structural shell on the 27.5-year residential schedule. Combined with the 2026 bonus depreciation rate of 40%, owners can front-load deductions and dramatically reduce early-year taxable income.
How the IRS Treats Cost Segregation
Cost segregation is sanctioned by the IRS Cost Segregation Audit Technique Guide. The guide identifies six tests — function, design, purpose, etc. — for distinguishing §1245 personal property from §1250 real property. The asset class lives come from Revenue Procedure 87-56, which sets MACRS recovery periods. A defensible study uses an engineering-based approach, not a "rule-of-thumb" allocation. Typical residential studies reclassify 15-25% of building basis to 5-year and 5-15% to 15-year improvements.
Why 2026 Bonus Rate Is 40%
The Tax Cuts and Jobs Act of 2017 introduced 100% bonus depreciation for qualified property placed in service through 2022. It phased down 20 points per year: 80% in 2023, 60% in 2024, 40% in 2025-2026 (per current statutory schedule), and continues lower thereafter unless Congress acts. The One Big Beautiful Bill Act has discussion of permanent 100% bonus restoration but is not enacted as of this calculator's last update. Verify your placed-in-service date and current law before filing.
§1245 vs §1250 Recapture on Sale
Cost segregation accelerates deductions but creates a recapture liability at sale. §1245 ordinary recapture hits all 5-year and 7-year personal property — you pay ordinary tax (up to 37%) on the lesser of accumulated depreciation or gain attributable to that asset. §1250 unrecaptured gain hits the 27.5-year building and 15-year land improvements at the 25% maximum rate per IRC §1(h)(1)(E). 1031 like-kind exchanges can defer both, but only for real property — personal-property portions of a cost seg study cannot be 1031-exchanged after TCJA.
NPV Beats MACRS — But Only Above a Threshold
The tax savings have time value. Front-loaded deductions in year 1-5 at a 7% discount rate are roughly 30-40% more valuable than the same deductions spread over 27.5 years. A typical $500K building with 20% reclassified yields $80-$120K NPV advantage vs straight-line MACRS. The cost segregation study itself runs $5,000-$15,000 — meaningful only if your basis exceeds ~$300K and you can use the deductions (no passive loss suspension). Talk to a CPA before commissioning a study. Last updated May 2026.