The decision this guide resolves

100% bonus is not a 100% deduction for every dollar spent on a building. Acquisition, placed-in-service timing, qualifying asset classes and elections all matter.

A practical fact pattern

A property closes in 2026 but an earlier binding contract may affect acquisition timing. Record the contract history before applying a headline rate.

Records to gather before deciding

  • Binding contract and amendments
  • Closing and readiness records
  • Asset classes and prior bonus elections

Frequently Asked Questions

Is 100% bonus depreciation available in 2026?

Current federal law generally restores 100% bonus for eligible property acquired and placed in service after January 19, 2025, subject to detailed acquisition, eligibility and election rules. Older acquisition dates can fall under prior phase-down rules. Do not apply the new rate merely because the study is written in 2026.

Does the rental building itself qualify for bonus?

The building generally does not qualify under the ordinary 20-years-or-less property rule. Eligible shorter-life components identified by a supported study may qualify, along with qualifying separately acquired assets. Determine recovery periods first, then test bonus eligibility asset by asset.

Can used rental components qualify for bonus?

Potentially, if the statutory used-property acquisition conditions are met. Prior use by the taxpayer, related-party acquisitions and certain carryover-basis transactions can prevent qualification. A used building purchase is not automatically excluded, but neither does every transfer of an old property create eligible new basis.

Can I elect out of bonus depreciation?

There is an election out for classes of property, subject to timing and procedural rules. Consider multi-year taxable income, state treatment and future sale taxes before electing. An election generally cannot be selectively applied to one convenient asset within the same class without the applicable authority.

Is the bonus rate based on the study completion year?

No. The relevant acquisition and original placed-in-service facts and elections control the historical depreciation calculation. A later look-back study does not make old assets newly acquired. Separate newly installed improvements from the original building components before modeling any current-year bonus deduction.

How to turn the answers into a return decision

Write down the property owner, affected tax year, the factual test being used and the evidence supporting it. Reconcile the amount on the study or workpaper with the return schedule, identify any limitation and assign the filing task to a named preparer. If a fact is missing, resolve it before treating the estimated deduction as usable.

Reviewed sources and scope

Reviewed November 8, 2026 by AE Tax Advisors. This is a federal planning resource; the facts, tax year, elections and state rules control the actual return. IRS publications explain rules but do not replace applicable law. The cost segregation audit guide is nonbinding examiner guidance and predates later bonus-depreciation changes.

Bring the facts to a scoped review

A study estimates asset classifications; a tax review determines eligible and currently usable deductions. Ask who reconciles basis, prepares any Form 3115 or amended return, and implements the final schedules. No tax saving or investment outcome is guaranteed.

Cost segregation service and scope · Documents checklist · Advisory pricing

Talk Through Your Situation

Discuss your priorities, upcoming decisions and whether a study or advisory engagement fits. Detailed analysis, implementation or filing work follows an agreed written scope.

Business Owners: Are You Overpaying on Taxes?

Book a Cost Seg Discovery Call