Delaware Tax Changes 2026: A CPA Guide | HelloBooks Delaware HB 255 decouples from OBBBA bonus depreciation, qualified production property and retroactive R&D. SALT follows the federal cap for 2025.
Delaware conforms to federal AGI and federal itemized deductions, then carves out three business provisions. The result is simple for most individuals and a reconciliation job for many businesses.
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Decoupling law
HB 255
Applies: Tax year 2025From IRS.gov · checked October 10, 2026
The Division of Revenue lists three One Big Beautiful Bill Act provisions Delaware does not follow, with detail in TIM 2025-02:
Because Delaware uses the federal definition of itemized deductions, the higher $40,000 SALT cap carries through for 2025. The tips, overtime and car loan interest deductions are not federal itemized deductions, so the Division says they do not reach the Delaware personal income tax return.
Calendar-year partnership and S corporation returns were due March 16, 2026. C corporation returns, which start from federal taxable income with the HB 255 exceptions, were generally due April 15, 2026.
Delaware corporations now need a federal and a state depreciation schedule for assets placed in service after January 19, 2025. Record each asset once in HelloBooks with its in-service date and cost, and build both schedules from that list. Delaware has no general sales tax; see /us/sales-tax/delaware for what applies instead.
The plain-English summary for business owners
Schedule A · state and local taxes
Business returns · Form 4562
State returns · Maryland
General information for tax professionals, not advice on a specific return. Figures are from IRS.gov on the date shown; check the current IRS instructions before filing.
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