Pennsylvania depreciation rules do not follow the federal system. The state disallows bonus depreciation in full, applies its own Section 179 limits that differ depending on how your business is taxed, and requires a separate depreciation schedule for every business asset. With 100 percent federal bonus depreciation restored for property acquired after January 19, 2025, the gap between what you deduct federally and what Pennsylvania allows has widened again for 2026 returns.1Internal Revenue Service. Interim Guidance on Additional First Year Depreciation Deduction under Section 168(k)
Why Federal and State Numbers Diverge
Pennsylvania builds taxable income from its own income categories rather than importing a federal figure wholesale. The Tax Reform Code sets separate cost-recovery rules that reject the two biggest federal accelerators: bonus depreciation under IRC Section 168(k) and, historically, expanded Section 179 expensing. The result is that Pennsylvania spreads the cost of business property over more years than the federal system does, producing higher state taxable income early in an asset’s life and lower state income late.
Your entity type determines which rules apply. C-corporations file under the Corporate Net Income Tax (CNIT) at 7.49 percent for 2026.2Pennsylvania Department of Revenue. Corporation Tax Rates Individuals, partnerships, S-corporations, and LLCs taxed as pass-throughs file under the Personal Income Tax (PIT) at a flat 3.07 percent.3Pennsylvania Department of Revenue. Personal Income Tax The depreciation mechanics differ between the two, so entity type drives both the method you use and the size of the state adjustment.
Bonus Depreciation Must Be Added Back in Full
Bonus depreciation is the single largest driver of the federal-state gap. Every dollar of Section 168(k) bonus depreciation claimed on your federal return must be added back when calculating Pennsylvania taxable income.4Pennsylvania Department of Revenue. Corporation Tax Bulletin 2018-03 – Bonus Depreciation Under Act 72 of 2018 You then calculate a separate state deduction using the method your entity type requires.
Here is the pattern in practice. Suppose you buy $500,000 of equipment in 2026 and deduct the full amount as bonus depreciation federally. For Pennsylvania, you add the entire $500,000 back into income. You then take a state depreciation deduction, which in year one might run roughly $70,000 to $100,000 depending on asset class and entity type. That timing difference hits your state tax bill immediately.
Total depreciation eventually equals out. When the asset is fully depreciated or sold, any bonus depreciation previously added back but not yet recovered through annual state deductions becomes available. Capital-intensive businesses can tie up real cash waiting for that recovery.
Qualified Production Property Under Section 168(n)
The One, Big, Beautiful Bill Act created a new category of accelerated depreciation for qualified production property under IRC Section 168(n). Pennsylvania decouples from this provision as well. Act 45 of 2025 requires CNIT filers to add back any federal depreciation claimed under Section 168(n) and recover the cost using normal state depreciation rules.5Pennsylvania Department of Revenue. 2025 PA Corporate Net Income Tax CT-1 Instructions (REV-1200) This is a new adjustment for 2025 and 2026 returns.
Section 179 Expensing Limits
Section 179 lets you immediately deduct the cost of qualifying equipment rather than depreciating it. The federal limit for 2026 is $2,560,000, phasing out beginning at $4,090,000 of total qualifying purchases.6Internal Revenue Service. Revenue Procedure 2025-32 Pennsylvania handles this differently by entity type.
CNIT Filers
C-corporations get the federal Section 179 amount without modification. Pennsylvania makes no CNIT adjustment for Section 179, so whatever you expensed federally flows through to the state return.7Pennsylvania Department of Revenue. Are PA C Corporations Entitled to the Same Section 179 Deduction as Allowed on the Federal Return No add-back, no separate calculation.
PIT Filers
Pass-through entities and individuals had a much lower cap for years. Before 2023, the Pennsylvania PIT Section 179 limit was $25,000. Act 53 of 2022 raised the PIT limit to match the federal dollar limitation, with annual inflation adjustments, for property placed in service on or after January 1, 2023.8Pennsylvania Department of Revenue. Personal Income Tax Bulletin 2023-02 – Section 179 Property Deduction For 2026, PIT filers can generally expense up to $2,560,000 for state purposes as well, and the phase-out threshold tracks the federal figure.
Two limits still apply. The PA Section 179 deduction cannot exceed the taxpayer’s net profits for the year. And for assets placed in service before 2023 under the old $25,000 cap, the historic rules still govern; any federal Section 179 that exceeded the old cap had to be capitalized and depreciated for state purposes, and those schedules continue.
How CNIT Filers Calculate State Depreciation
Act 72 of 2018 sets the framework for property placed in service after September 27, 2017.9Pennsylvania General Assembly. Act No. 72 of 2018 – Tax Reform Code of 1971 – Defining Taxable Income After adding back federal bonus depreciation, CNIT filers calculate a substitute state deduction using federal MACRS methods, applied to the asset’s full cost (minus any Section 179 amount) rather than a basis already reduced by bonus depreciation.4Pennsylvania Department of Revenue. Corporation Tax Bulletin 2018-03 – Bonus Depreciation Under Act 72 of 2018 The same recovery periods apply, and accelerated methods such as 200 percent or 150 percent declining balance are permitted.
The math on the return: start with federal taxable income, add back Section 168(k) bonus depreciation, then subtract the Pennsylvania-calculated MACRS deduction. Report these adjustments on Schedule C-8 (REV-1834), filed with the RCT-101. If Section 168(n) property is involved, Schedule C-10 handles that add-back separately.5Pennsylvania Department of Revenue. 2025 PA Corporate Net Income Tax CT-1 Instructions (REV-1200)
Because accelerated MACRS methods are still available, the early-year gap between federal and state depreciation is smaller for CNIT filers than for PIT filers. The state deduction ramps up meaningfully in the first few years, though it never matches the full first-year federal write-off.
How PIT Filers Calculate State Depreciation
The rules for individuals and pass-through entities are more restrictive and turn on a single question: does the Pennsylvania basis of the asset match the federal basis? If yes, which can happen when no bonus depreciation is claimed and Section 179 amounts are identical, you can use any generally accepted depreciation method, including MACRS.10Pennsylvania Department of Revenue. Net Income (Loss) from the Operation of a Business, Profession or Farm
If the bases differ, and they almost always do when bonus depreciation is in the picture, you must use the straight-line method over the federal MACRS recovery period for Pennsylvania purposes.11Pennsylvania Department of Revenue. Pennsylvania Personal Income Tax Guide – Net Income (Loss) from the Operation of a Business, Profession or Farm Straight-line means equal annual deductions across the recovery period. A seven-year asset with a $70,000 Pennsylvania basis produces roughly $10,000 per year in state depreciation, against the entire $70,000 deducted federally in year one through bonus.
This is the starkest difference between the two Pennsylvania regimes. A C-corporation and an S-corporation buying identical equipment on the same day will show different Pennsylvania depreciation in every year of the asset’s life, solely because of entity type.
Selling or Disposing of an Asset
When you sell business property, gain equals sale price minus adjusted basis. Because Pennsylvania deductions run smaller in the early years, the state adjusted basis stays higher than the federal adjusted basis for most of the asset’s life. That higher state basis produces a smaller taxable gain, or a larger deductible loss, at sale.
For CNIT filers, the year of sale triggers a catch-up. Any bonus depreciation previously added back but not yet recovered through annual state MACRS deductions becomes deductible in the year of disposition. Report this on Schedule C-9 (REV-1834) for Section 168(k) property and Schedule C-11 for Section 168(n) property.5Pennsylvania Department of Revenue. 2025 PA Corporate Net Income Tax CT-1 Instructions (REV-1200) Missing this deduction is one of the most expensive errors on Pennsylvania returns, because it means you paid state tax on income the add-back created and never captured the offsetting deduction.
PIT filers do the same in substance. State gain or loss is calculated using the Pennsylvania adjusted basis, which reflects the smaller straight-line deductions taken over the holding period. Using the federal basis instead overstates the Pennsylvania gain.
Electing Out of Federal Bonus Depreciation
One way to simplify Pennsylvania compliance is to elect out of federal bonus depreciation. IRC Section 168(k)(7) allows this election for any class of property in any tax year.12Office of the Law Revision Counsel. 26 U.S. Code 168 – Accelerated Cost Recovery System The election applies to all qualifying property in that class placed in service during the year; individual assets cannot be cherry-picked. You make the election by filing a statement with Form 4562 by the due date (including extensions) of the federal return for the placed-in-service year, and once made it can only be revoked with IRS consent.13Internal Revenue Service. Additional First Year Depreciation Deduction (Bonus) – FAQ
When you elect out and take the same Section 179 amount for both jurisdictions, federal and Pennsylvania bases match. For PIT filers, matching bases open up any acceptable depreciation method for the state, not just straight-line. For CNIT filers, matching bases eliminate the Schedule C-8 add-back and substitution entirely. The trade-off is a smaller federal deduction in year one; the value of the trade depends on your numbers.
Records You Need to Keep
Two depreciation schedules mean twice the documentation. For every depreciable asset, track the date placed in service, original cost, any Section 179 amount claimed (federal and state), the depreciation method used for each jurisdiction, annual deductions taken, and the current adjusted basis under both systems. The IRS requires records for depreciable property to be kept until the statute of limitations expires for the tax year the asset is disposed of.14Internal Revenue Service. Topic No. 305, Recordkeeping That is at least three years after filing the return for the year of sale, and six years if income was understated by more than 25 percent.
At sale, you need documentation that substantiates both the federal and Pennsylvania adjusted bases, including capital improvements, Section 179 elections, and cumulative depreciation.15Internal Revenue Service. Basis of Assets For businesses with many assets, this generally means dedicated fixed-asset software or a spreadsheet that carries both basis figures per item. The riskiest period is after an asset is fully depreciated federally but still carries Pennsylvania basis. Businesses often stop tracking at that point and lose the remaining state deduction when they eventually dispose of the asset.
What Happens if You Skip the Adjustments
Depreciation errors that understate Pennsylvania income trigger interest and penalties on the underpayment. At the federal level, the standard accuracy-related penalty is 20 percent of the underpayment caused by negligence or disregard of rules, and 40 percent for gross valuation misstatements.16Office of the Law Revision Counsel. 26 U.S. Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments Pennsylvania assesses its own underpayment interest and penalties on top.
The most common error is not aggressive; it is passive. Taxpayers move federal depreciation figures onto the state return without making the required add-backs and substitutions. Auditors catch this quickly because bonus depreciation claimed federally with no corresponding Pennsylvania adjustment is visible on the face of the return. Keeping the separate schedules described above is the simplest way to avoid the assessment.