Why owners consider cost seg: It can produce six figure deductions in the first year, improving cash flow by lowering current tax liability, and you still have the flexibility to study a property years after purchase.

Educational overview only not financial or investment advice. If you choose this route, Doc Wealth can handle the tax reporting.

Confirm property eligibility, study type, and depreciation elections with your own advisor before proceeding.

Step 1: Decide whether a cost segregation study makes sense

Cost segregation works best for commercial buildings or rental properties that were placed in service recently, or that still have plenty of remaining depreciable basis. By carving out items like flooring, cabinetry, parking lots, and landscaping into 5, 7, or 15 year classes, you front-load depreciation and pair it with 100% bonus depreciation (now permanent for property acquired after January 19, 2025) to create a large first-year paper loss.

Step 2: Pick the study style that fits you

Full engineering study

  • A certified engineer visits the property, measures and photographs every component, and delivers a highly detailed report.
  • Highest audit protection and most granular asset breakdown.
  • Takes four to six weeks and costs more (often $4–8 k for a single family rental, $10 k+ for larger commercial).

Model or “desk” study

  • No site visit analysts rely on cost databases, blueprints, and photos you provide.
  • Faster turnaround (one to two weeks) and roughly half the price of a full study.

Doc Wealth can introduce you to either a full service engineering firm or a reputable desk study provider if desired.

Step 3: Apply the results on your tax return

You’ll receive a revised depreciation schedule that shows the re classified assets and bonus eligible amounts. For a property you have owned for a while, we file Form 3115 (a change in accounting method) with your current-year return. That lets you take all the depreciation you could have taken in earlier years as one catch-up deduction now, with no amended returns needed. For a new purchase, the numbers flow straight into year one depreciation. The losses show up on Schedule E. Whether they can offset your W-2 or 1099 income depends on your situation: they can if the property qualifies under the short-term rental rules or you qualify as a real estate professional (see our STR and REPS guides). Otherwise the losses are passive; they cannot offset your clinical income and instead carry forward until you have passive income or sell the property.