Original cost segregation and fixed-asset schedules
CALIFORNIA RENOVATION TAX PLANNING
Reviewed August 30, 2026 · Updated for current federal bonus-depreciation guidance
Track what came out before adding what went in.
A renovation can create two separate tax questions: how to classify the new improvements and whether removed building components qualify for partial-disposition treatment. A cost segregation or engineering allocation can help identify component costs, but the owner’s CPA decides capitalization, repair treatment, elections, reporting and whether a disposition is recognized.
- ✓ No study work before payment
- ✓ CPA-ready final report
- ✓ California statewide
WHY IT MATTERS
Move eligible basis into faster recovery periods.
The IRS tangible-property rules use a facts-and-circumstances framework for repairs and improvements. Publication 946 explains that retiring a structural component is not a disposition unless the partial-disposition rules apply, and Form 4797 instructions address reporting when an election is made. Owners should preserve before-and-after photographs, demolition scope, contractor detail, original asset schedules, replacement invoices and service dates before costs are compressed into a single project total.
Plain English: you are not creating a new deduction. You are identifying when supported pieces of the property may be depreciated.
WHAT WE REVIEW
Renovation records to preserve before filing
Before-and-after photographs and demolition scope
Removed roof, HVAC, plumbing, electrical or finish components
New improvement invoices and contractor cost detail
Repair-versus-improvement analysis by building system
Federal election timing and separate California basis schedules
SHOW ME THE NUMBERS
What a renovation analysis should separate
Illustrative only. This assumes a 37% federal marginal rate where shown and that the owner can currently use the deduction.
- Property value
- Original building and current project
- Estimated depreciable basis
- Remaining basis of removed components
- Potential faster basis
- New assets classified by supported function
- Potential upfront federal effect
- CPA-determined disposition and depreciation treatment
- Study or comparison benchmark
- Separate California adjustment review
This is a timing illustration, not guaranteed permanent tax savings. California commonly requires a separate depreciation schedule because it generally does not conform to federal bonus depreciation.
DOES IT FIT?
Strong candidates usually have four things.
✓
Owner replaced meaningful building components
✓
Removed and new costs can be supported
✓
Project and placed-in-service dates are documented
✓
CPA reviews elections before the return is filed
PORTFOLIO PRICING
More properties. Lower cost per study.
Order and pay for the properties together to receive a simple portfolio discount.
2 properties5% off3 to 4 properties10% off5+ properties15% off
STRAIGHT ANSWERS
Frequently asked questions.
Does replacing a roof automatically create a write-off for the old roof?+
No. The improvement and disposition rules are separate and fact specific. The CPA should determine capitalization, whether a partial-disposition election is available, the supported adjusted basis and the required reporting.
Can a cost segregation study estimate the basis of removed components?+
It can provide an engineering allocation or component detail, but the method, records and tax treatment must be supportable. The CPA decides how the estimate is used on the return.
When should the owner gather documentation?+
Before demolition whenever possible. Photographs, plans, contractor scope, original schedules and invoices are easier to preserve while the removed components can still be identified.
Why is a separate California review needed?+
California and federal depreciation amounts can differ. FTB Form 3885A is used when California depreciation or amortization differs from the federal amount, so the state basis and schedules should be updated with the CPA.
Is the free estimate a completed study?+
No. It is an illustrative screen using the facts you provide. No engineering takeoff, professional certification or tax opinion is included. Technical work begins only after a signed and paid engagement.
Does my CPA need to approve the study first?+
No. It is smart to ask whether you can currently use additional depreciation, but the paid study does not require advance CPA approval. Your CPA makes the final filing decision.
Do you guarantee tax savings?+
No. A study accelerates the timing of eligible depreciation. Results depend on basis, property facts, placed-in-service dates, passive-loss rules, tax rates and the owner's filing position.
AUTHORITATIVE SOURCES
Reviewed against current IRS and California guidance.
Last reviewed August 30, 2026. Tax rules and procedures can change. Your CPA should confirm the law that applies to your acquisition date, placed-in-service date and return.
IRS Topic 704: Depreciation↗IRS Cost Segregation Audit Technique Guide↗IRS Notice 2026-11: 100% bonus depreciation guidance↗IRS Notice 2026-16: qualified production property↗California FTB federal tax change summary↗IRS Tangible Property Final Regulations↗IRS Publication 946: How To Depreciate Property↗IRS Instructions for Form 4797↗IRS Publication 551: Basis of Assets↗California 2025 Form 3885A Instructions↗
FREE PRELIMINARY PROPERTY SCREEN