Ohio Cost Segregation: State Add-Backs and Tax Planning

By AE Tax Advisors · Published 2026-01-06 · Updated November 8, 2026.

An Ohio cost segregation projection needs separate federal and state calculations. A federal bonus deduction does not flow unchanged through the Ohio return. Determine the taxpayer, asset basis, applicable add-back and later deduction schedule before quoting a current tax benefit.

Reconcile federal depreciation first

Start with a supported asset schedule, acquisition and service dates, land allocation and elections. Apply federal basis, at-risk, passive-activity and other loss limits. The state adjustment is another calculation, not a replacement for that work.

Apply Ohio's add-back rules to the actual facts

Ohio Revised Code Section 5747.01(A)(17) generally requires an addition for specified accelerated depreciation. The familiar five-sixths rule has exceptions and related provisions. Section 179 amounts also require their own computation; do not assume that all equipment deductions have identical treatment.

The two-thirds alternative concerns the qualifying increase in Ohio income taxes withheld. Another exception concerns an increase meeting the relevant depreciation amount. Preserve the withholding records and identify the entity generating each depreciation amount.

Distinguish an NOL from negative AGI

The statute's full-add-back provision addresses a federal net operating loss to the extent it resulted from the specified depreciation. Negative federal adjusted gross income alone is not a sufficient substitute for that analysis. Determine whether the taxpayer actually incurs the relevant NOL and which depreciation caused it.

Ohio's later deduction provisions also address amounts that result in or increase a federal NOL carryback or carryforward. Keep a year-by-year record; do not assume a fixed subtraction remains usable regardless of the later return.

Carry the adjustment through future years

Section 5747.01(A)(18) provides different recovery schedules corresponding to the original add-back. Track the originating year, amount, taxpayer and applicable schedule. An owner receiving pass-through information needs sufficient detail to avoid duplicating or omitting an adjustment.

A federal depreciation schedule alone is not the complete Ohio workpaper. Reconcile state adjustments to the actual filed returns and preserve prior-year balances.

Keep the business-income and election calculations separate

Ohio's business-income deduction, individual rate rules and elective pass-through entity tax are distinct provisions. Filing status, income character, apportionment, owner credits and election/payment requirements matter.

The IT 4738 instructions describe a 3% rate for applicable reporting periods beginning in 2023 and thereafter. Evaluate the election with the owner's return and current-year instructions rather than assuming that an entity tax payment guarantees a net saving.

What to prepare for an Ohio study review

• Property closing, land allocation, improvements and existing depreciation.
• Federal and Ohio returns with prior add-back schedules.
• Entity ownership and Ohio K-1 information.
• Withholding support and NOL calculations where relevant.
• Expected use, holding period and sale assumptions.

Book a Cost Seg Discovery Call. A standalone study, federal or state return preparation and advisory work require clear scopes and fees; see AE's service pricing.

Frequently Asked Questions

Sources and review notes

Reviewed November 8, 2026 by AE Tax Advisors. Examples are illustrative; apply the rules to the relevant tax year and records. See our editorial policy.

• Ohio Revised Code Section 5747.01: add-backs and deductions
• Ohio IT 4738 instructions: pass-through reporting and depreciation
• IRS Publication 946: federal depreciation
• IRS Publication 925: federal loss limits