The distinction: pre-tax vs. after-tax
Cost segregation leaves your gross rents, operating expenses, and mortgage payments unchanged. Pre-tax cash flow stays the same. What changes is your federal (and often state) income tax liability: by front-loading depreciation deductions into years 1 through 5 instead of spreading them over 27.5 years, you reduce — or eliminate — the tax owed on rental income in those early years. That tax reduction is real money that stays in your portfolio.
A concrete example
Assume you buy a $600,000 property (building $480,000) and it generates $25,000 of taxable rental income before depreciation. Straight-line: $480,000 / 27.5 = $17,455/year, leaving $7,545 taxable. With a cost seg study, you identify $100,000 of 5-year components and $40,000 of 15-year components. Bonus-depreciate both in year one: that is $140,000 of additional first-year deductions, turning a $7,545 taxable income into a large paper loss. At a 35% tax rate, the net tax swing could be $50,000 or more in year one alone — real savings that improve your total return.
Putting the savings back to work
The year-one tax savings improve your effective cash-on-cash return. If you invested $150,000 in cash and save $50,000 in taxes in year one, your effective annual return on that equity is dramatically better than the pre-tax number suggests. Many investors model this as 'pulling forward deductions' — you are receiving now the tax benefit that would otherwise arrive in small increments over 27.5 years, and compounding those savings through reinvestment.
Frequently asked questions
Does cost segregation increase cash flow directly?
No — rents and expenses stay the same. It reduces your tax bill, which improves after-tax cash-on-cash return.
How does cost segregation improve IRR?
By front-loading deductions into early years, you get the tax benefit when the time value of money is greatest, improving the overall internal rate of return on the investment.
Sources
- IRS Publication 946 — How to Depreciate Property
- IRS — Cost Segregation Audit Techniques Guide
- IRS Publication 527 — Residential Rental Property
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.