Key Takeaways
- Cost segregation increased Year 1 depreciation from $61,818 to $372,832—a $311,014 increase (5x).
- The $8,500 study generated $74,643 in additional Year 1 tax savings at the 24% bracket—a 778% ROI.
- Reinvesting the Year 1 tax savings at 8% generates approximately $161,000 in additional compound wealth over 10 years.
- Cost segregation benefits are fully realized only when the investor has sufficient income to absorb the accelerated deductions.
This case study follows a cost segregation study on a $2M, 12-unit apartment complex acquired in 2024. The analysis quantifies the Year 1 tax impact with and without cost segregation and demonstrates the compound benefit over a 10-year holding period.
Property Profile and Study Results
Property: 12-unit apartment complex, purchased for $2,000,000. Land value: $300,000 (15%). Building basis: $1,700,000. The cost segregation study ($8,500 fee) identified: 5-year property ($170,000): appliances, carpeting, vinyl flooring, window treatments, dedicated electrical for appliances. 7-year property ($85,000): cabinetry, countertops, decorative fixtures, mailboxes, signage. 15-year property ($255,000): parking lot, landscaping, fencing, exterior lighting, sidewalks. 27.5-year property ($1,190,000): structural building components. Total reclassified: $510,000 (30% of building basis).
Year 1 Depreciation: With vs. Without Cost Segregation
Without cost segregation: $1,700,000 / 27.5 years = $61,818 Year 1 depreciation (prorated by mid-month convention for month of acquisition). With cost segregation and 60% bonus depreciation (2024): 5-year bonus: $170,000 × 60% = $102,000. Regular on remaining 5-yr basis: ($170,000 − $102,000) × 20% = $13,600. 7-year bonus: $85,000 × 60% = $51,000. Regular on remaining 7-yr basis: ($85,000 − $51,000) × 14.29% = $4,859. 15-year bonus: $255,000 × 60% = $153,000. Regular on remaining 15-yr basis: ($255,000 − $153,000) × 5% = $5,100. 27.5-year regular: $1,190,000 / 27.5 = $43,273. Total Year 1 with cost seg: $372,832. Increase over standard: $372,832 − $61,818 = $311,014. At 24% marginal rate: additional Year 1 tax savings of $74,643. After subtracting the $8,500 study fee: net Year 1 benefit of $66,143. The cost segregation study generated a 778% return on investment in Year 1 alone.
Ten-Year Compound Impact
Over a 10-year holding period, cost segregation does not change the total depreciation—it accelerates it. The same $1,700,000 is depreciated either way. The benefit is the time value of money: receiving $311,014 in additional deductions in Year 1 (versus spreading them over 27.5 years) and reinvesting the $74,643 tax savings at an 8% return generates approximately $161,000 in additional wealth over 10 years through compounding. At sale, the depreciation recapture tax is identical whether cost segregation was used or not—the investor pays 25% recapture on the same total depreciation. The only difference is when the deductions were taken. If the investor performs a 1031 exchange at sale, the recapture is deferred entirely, making cost segregation even more advantageous. Important caveat: these benefits are fully realized only if the investor has sufficient income (active or passive, depending on REPS status) to absorb the accelerated deductions. An investor with $40,000 in rental income and $372,832 in depreciation creates a $332,832 passive loss—which is suspended unless REPS applies.
Key Takeaways
- ✓Cost segregation increased Year 1 depreciation from $61,818 to $372,832—a $311,014 increase (5x).
- ✓The $8,500 study generated $74,643 in additional Year 1 tax savings at the 24% bracket—a 778% ROI.
- ✓Reinvesting the Year 1 tax savings at 8% generates approximately $161,000 in additional compound wealth over 10 years.
- ✓Cost segregation benefits are fully realized only when the investor has sufficient income to absorb the accelerated deductions.
Sources
- IRS Cost Segregation Audit Techniques Guide(2024-12-15)
- IRS Publication 946 — How to Depreciate Property(2024-12-15)
Common Mistakes to Avoid
Believing that cost segregation creates additional depreciation rather than accelerating existing depreciation
Consequence: The investor overestimates the total tax savings; in reality, accelerated deductions in early years mean lower deductions in later years—it is a timing benefit, not an additional deduction
Correction: Understand that cost segregation is a timing strategy: it front-loads depreciation for the time value of money benefit but does not change the total amount depreciated over the property's life
Not modeling the depreciation recapture impact when eventually selling the property after cost segregation
Consequence: Accelerated depreciation reduces basis faster, increasing the depreciation recapture amount (taxed at 25%) upon sale—the "free" deductions create a future tax obligation
Correction: Model the full lifecycle: accelerated depreciation saves taxes now at the marginal rate (22-37%), but recapture at 25% upon sale partially offsets the benefit. The net advantage depends on the time value spread and 1031 exchange planning.
Test Your Knowledge
1.In a cost segregation case study, what is the typical percentage of a building's depreciable basis that can be reclassified to shorter-lived property?
2.Over a 10-year analysis, what happens to the total depreciation deduction with and without cost segregation?
3.What is the primary financial benefit of accelerating depreciation into year one?