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Cost Segregation Calculator

Estimate accelerated depreciation and potential federal tax impact from a cost segregation study.

Depreciation for selected tax year

Chart metric:
ScenarioDepreciationFederal Tax Impact
No Study$15,758$5,830
Typical$247,109$91,430
Optimized$235,345$87,078
Disclaimer: This calculator is provided for informational purposes only and does not constitute financial, legal, or tax advice. Results are estimates based on standardized depreciation conventions (MACRS) and simplified assumptions. “Federal Tax Impact” is estimated as (depreciation × selected federal rate) and does not model passive loss limits, AMT/NIIT, state decoupling, elections, or every edge case. Consult a qualified tax professional before making decisions.

Cost segregation: the basics

Cost segregation can accelerate depreciation by reclassifying parts of a building into shorter-life asset classes. That can increase deductions earlier, especially when bonus depreciation is available.

What it does

Splits depreciable basis into short-life property (often 5/7/15-year) + remaining building life (27.5/39-year).

When it tends to pencil

Higher basis, meaningful improvements, higher tax rate, and/or bonus depreciation availability.

What matters for accuracy

Land value, placed-in-service date, and renovation/improvement details are usually the biggest drivers.

Important note

This calculator estimates depreciation and an illustrative federal tax impact. It does not model passive loss limitations, REPS/STR grouping, AMT/NIIT, state rules, or elections. Use it to understand “order of magnitude,” then validate with a property-specific review.

Editorial review

Reviewed for tax accuracy

Educational tax content prepared by HavenStone Advisory and reviewed for technical accuracy. It is not individualized tax, legal, accounting, investment, or financial advice. Rules can change, and your facts matter, so confirm decisions with your CPA, attorney, or tax advisor before acting.

Reviewed by Mia Anne Pham Reeves, CPA

See our editorial policy or report a correction.

Verify reviewer CPA license through TSBPA

Primary references

Review standard

  • Primary-source references checked where rule-specific claims are made.
  • Article scope limited to educational information unless a client engagement exists.
  • Time-sensitive tax rules labeled with published, updated, or reviewed dates.

Continue planning

Cost Segregation Quick Take

Read the companion article on when accelerated depreciation helps and when it backfires.

Real Estate Tax Planning

Review bookkeeping and tax-planning considerations for real estate professionals.

Business Tax Strategy

Coordinate depreciation, entity structure, and cash-flow planning before filing.

Related video

Cost Segregation (Quick Take)

Cost segregation doesn’t create deductions - it accelerates them. Here’s when it creates real tax leverage, when it backfires, and how to evaluate it like an operator.

Read the full blog post

Frequently asked

Quick answers to common questions about eligibility, bonus depreciation, timing, and documentation.

A cost segregation study identifies building components that can be reclassified into shorter IRS recovery periods (commonly 5-, 7-, and 15-year property) instead of depreciating everything as 27.5- or 39-year building. The goal is to accelerate depreciation (often increasing deductions earlier).
In most cases it’s primarily a timing shift: you generally accelerate depreciation into earlier years, which can improve cash flow. Total depreciation over the full life is usually similar, but the schedule can change and may affect future gain/recapture considerations.
Cost segregation is commonly used for residential rental real estate (27.5-year building portion) and commercial real estate (39-year building portion). Eligibility and the “best” approach depend on how the property is used, the placed-in-service date, and the types of improvements.
Bonus depreciation generally applies to eligible short-life components (often 5-, 7-, and 15-year property) and can significantly increase year-one deductions when available. The building portion is generally not eligible for bonus.
Placed in service is the date the property is ready and available for its intended use. It affects when depreciation begins, which convention applies, and which bonus depreciation rules might apply.
Often yes. Many taxpayers do a “lookback” study and may claim a catch-up adjustment for missed depreciation (commonly handled through a change in accounting method). The best approach depends on your facts and filing position.
Sometimes. It depends on depreciable basis, your tax rate, expected short-life allocations, bonus availability, and whether you can actually use the deduction under your tax situation. A quick feasibility estimate is usually the right first step.
Any position can be reviewed, but a well-documented, defensible study prepared with appropriate methodology and support is designed to hold up under scrutiny. The quality of documentation matters.
Purchase price, land value (not depreciable), placed-in-service date, and material improvements/renovations. Your tax rate affects the “tax impact” estimate, but the depreciation schedule depends most on basis and classification.
No. This calculator estimates depreciation schedules and an illustrative federal tax impact (depreciation × rate). It does not model passive activity limits, REPS status, short-term rental grouping/material participation, AMT/NIIT, or state rules.

Build the full real-estate tax picture

Cost segregation is only one part of the tax plan. The related pages below help connect depreciation timing to entity planning, quarterly estimates, bookkeeping, and real-estate operations.

Real-Estate Bookkeeping & Tax Planning

Keep commissions, rentals, improvements, and owner activity organized before tax strategy decisions are made.

Open resource

Tax Playbook Estimator

Use quarterly estimates and deadline planning to decide when accelerated depreciation matters most.

Open resource

Business Tax Strategy

Coordinate depreciation, entity structure, owner compensation, and cash-flow planning with a tax advisor.

Open resource

See if cost segregation is worth it for your property

Get a CPA‑reviewed, property‑specific estimate of accelerated depreciation (including bonus eligibility), expected year‑one impact, and the documentation you’ll need to file cleanly. If a study won’t pencil, we’ll tell you.

Best next step: share purchase price, land estimate, placed‑in‑service date, and any renovation costs. We’ll help you choose the right approach (full study vs simpler options) based on ROI and audit support.