A conformity addition on your Virginia tax return is the dollar amount you add back to your Virginia taxable income because the state refuses to recognize certain federal tax deductions you claimed. Virginia ties its income tax calculations to the federal Internal Revenue Code, but it deliberately rejects a short list of federal breaks, most notably bonus depreciation and the increased Section 179 expensing limits. The result is a higher Virginia taxable income than what you reported federally, and for business owners who placed significant assets in service, the addition can be large.
Why Virginia Requires the Add-Back
Virginia Code § 58.1-301 links state income tax definitions to their federal counterparts and generally adopts the Internal Revenue Code.1Virginia Code Commission. Code of Virginia 58.1-301 – Conformity to Internal Revenue Code That link saves you from running two completely separate sets of calculations for most items.
But Virginia uses fixed-date conformity: it adopts the federal code as it existed on a specific date, currently December 31, 2025, with exceptions. Federal changes enacted after that date don’t flow through automatically; the General Assembly has to act. More importantly for most filers, Section 58.1-301 names specific federal provisions Virginia refuses to recognize regardless of the conformity date, and those carve-outs are what create the additions you report.1Virginia Code Commission. Code of Virginia 58.1-301 – Conformity to Internal Revenue Code
Federal Items That Create a Conformity Addition
Not every state-federal difference becomes a conformity addition. The additions come from a published list in Virginia’s Form 760 instructions.2Virginia Department of Taxation. Virginia 2025 Form 760 Resident Individual Income Tax Instructions
Bonus Depreciation Under IRC Section 168(k)
This is the most common trigger. Federal law allows 100% bonus depreciation for qualified property acquired after January 19, 2025, made permanent by the One Big Beautiful Bill Act signed in July 2025.3Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill Virginia does not recognize that benefit. If you claimed bonus depreciation federally, you recompute depreciation on those assets as if the bonus never existed, using standard recovery periods. The difference between your federal and Virginia depreciation is your addition.4Virginia Department of Taxation. Additions
The practical impact is real. A business that buys $500,000 in qualifying equipment and writes it all off federally has to spread that same cost across five, seven, or more years for Virginia purposes. In year one, the conformity addition can be most of the purchase price.
Expanded Section 179 Expensing
The One Big Beautiful Bill Act more than doubled the federal Section 179 limit. The base limit rose from $1,000,000 to $2,500,000, and the phaseout threshold moved from $2,500,000 to $4,000,000.5Virginia Senate Finance and Appropriations Committee. H.R. 1 and its Impact on Virginia Tax Conformity Virginia decouples from these increases. If you used the higher federal limit, you add back the portion that exceeds Virginia’s lower cap.
Qualified Production Property and Research Expenditures
Virginia also decouples from two other One Big Beautiful Bill Act provisions: immediate expensing of qualified production property under IRC Section 168(n), and immediate expensing of domestic research and experimental expenditures under IRC Section 174A, including the retroactive and catchup provisions.2Virginia Department of Taxation. Virginia 2025 Form 760 Resident Individual Income Tax Instructions If you took either federal benefit, the difference comes back on your Virginia return.
Net Operating Losses and Canceled Debt
Virginia continues to deconform from the five-year carryback of net operating losses generated in certain prior tax years and from the federal income tax treatment of canceled debt income on qualifying business debts.6Virginia Department of Taxation. 2023 Form 500NOLD Instructions Virginia generally allows an NOL deduction only to the extent federal AGI allows it, and it must be carried to the same year as for federal purposes.7Virginia Code Commission. 23VAC10-110-84 – Net Operating Loss Carrybacks and Carryovers Any mismatch creates an addition.
A Timing Difference, Not a Lost Deduction
A conformity addition does not mean Virginia permanently denies your deduction. It shifts the timing. When you add back bonus depreciation in the year you place an asset in service, you still recover the full cost of that asset over its standard recovery period for Virginia purposes. In later years, your Virginia depreciation on that asset exceeds your federal depreciation, because federally you already wrote the asset off, and that difference becomes a Virginia subtraction.
Buy $200,000 in equipment, deduct it all federally through bonus depreciation, and you have zero federal depreciation left on it in future years. For Virginia, you’re still depreciating that same equipment over its full recovery period. Each year’s Virginia depreciation produces a subtraction that gradually offsets the original addition. Over the life of the asset the totals match. Virginia just makes you spread the deduction out, which costs you the time value of the upfront write-off.
The recordkeeping consequence is where this gets heavy. You need a separate Virginia depreciation schedule for every asset that received bonus depreciation or excess Section 179 expensing federally, and you keep that schedule for the asset’s full recovery period.
Calculating the Addition
Start with your completed federal return and your federal Form 4562 (Depreciation and Amortization), which lists each asset where bonus depreciation or Section 179 expensing was claimed. For each asset that got a federal benefit Virginia doesn’t recognize, recompute depreciation without the bonus or expanded expensing.
Virginia’s 760 instructions describe the mechanics: recompute depreciation on all assets that received bonus depreciation under IRC § 168(k) or related provisions, and if your total Virginia depreciation is less than your total federal depreciation, the shortfall is your addition.2Virginia Department of Taxation. Virginia 2025 Form 760 Resident Individual Income Tax Instructions For non-depreciation items such as R&E and qualified production property, the instructions point you to the annual conformity update and to Tax Bulletin 26-1 for the most recent One Big Beautiful Bill Act adjustments.
One asset is simple. Multiple assets placed in service across multiple years, each with its own recovery period and method, is where tax software earns its cost. If you compute by hand, each asset gets its own line-by-line comparison.
Where It Goes on the Return
All conformity additions go on Line 2a of Virginia Schedule ADJ (Form 760-ADJ). The line has two parts: Part A for the bonus depreciation add-back, and Part B for all other conformity additions, including Section 179 and R&E adjustments. You combine Parts A and B, enter the total on Line 2a, then carry total additions from Line 3 of Schedule ADJ to Line 2 of Form 760.8Virginia Department of Taxation. 2025 Virginia Schedule ADJ (Form 760-ADJ)
For “Other Conformity Additions” on Part B, attach a schedule and explanation. These items don’t have dedicated lines or codes on the form, so the Department of Taxation needs your documentation to verify the amounts. Schedule ADJ has to be attached whether you file electronically or by mail. Omitting it or entering the wrong figure on Line 2a is a fast way to draw an adjustment notice, because the state cross-references federal depreciation data against Virginia returns.
Estimated Payments When the Addition Is Large
A conformity addition raises your Virginia taxable income, which can push your liability past what your withholding covers. Virginia requires estimated payments if your tax liability after withholding and credits exceeds $150.9Virginia Department of Taxation. Individual Estimated Tax Payments A big equipment purchase that produces a six-figure addition can easily cross that line, especially if your withholding is set to your federal number.
You avoid the underpayment addition to tax if each required installment meets one of these tests:
- Each installment equals or exceeds the matching installment from last year’s tax, and last year’s return covered a full 12 months.
- Each installment covers at least 90% of the amount due based on actual or annualized income for the period.
- The total underpayment across all installments is $150 or less.
Virginia quarterly estimated payments are due May 1, June 15, September 15, and January 15 of the following year. If a major asset goes into service mid-year, the annualized income method lets you concentrate payments into later quarters when the income actually hits, rather than spreading evenly. Any installment above $1,500, or any annual liability above $6,000, has to be submitted electronically.9Virginia Department of Taxation. Individual Estimated Tax Payments
Penalties for Missing the Addition
Skipping a required conformity addition understates your Virginia taxable income and underpays your tax. Virginia then assesses penalties and interest on the balance:
- Late payment penalty of 6% per month (or partial month) on the unpaid balance, up to a 30% cap.
- Extension penalty of 2% per month, up to 12%, if you filed an extension but didn’t pay enough with the extension request.
- Fraud penalty of 100% of the correct tax for a false return or deliberate omission.
- Interest at the federal underpayment rate under IRC Section 6621 plus 2 percentage points. With the federal underpayment rate at 7% in early 2026, Virginia’s effective rate starts at 9% annually, compounded daily.
Late payment penalty and interest run at the same time, so the cost of a missed addition compounds fast. For a business owner who placed $500,000 in equipment in service and failed to add back the depreciation difference, the underlying tax alone can be several thousand dollars before penalties and interest start. Catching the error before the Department of Taxation does won’t erase the interest, but it keeps you out of the worst penalty tiers and leaves more room to resolve the balance.