A Pennsylvania RSU tax calculator estimates the federal plus 3.07% PA flat tax owed on each vest. Default employer withholding (22% federal, 3.07% state) usually under-collects on the federal side — the calculator below shows the dollar shortfall for your bracket.
Calculate RSU Withholding
Estimate your RSU tax withholding and net proceeds after vesting.
Try Calculator →Open the Pennsylvania RSU tax calculator with these inputs prefilled →
How Pennsylvania taxes your RSU vest
Pennsylvania treats RSU income as taxable compensation for Personal Income Tax purposes: when shares vest, the fair-market value on the vest date is added to your Form W-2 Box 16 (PA state wages) in the year of vest and taxed at the flat 3.07% PA rate (IRS Publication 525 governs the federal treatment; PA conforms to the federal timing rule). Because Pennsylvania uses a single flat rate — no progressive brackets, no separate "high-income" surcharge — your PA liability scales linearly with RSU income. The bracket you fall into doesn't change the state math; only the dollar amount of the vest does.
The two numbers that matter on every vest:
- Federal supplemental withholding rate: 22% on RSU income up to $1M (IRS Publication 15). Above $1M, the rate jumps to 37%.
- Pennsylvania supplemental withholding rate: 3.07% flat. Pennsylvania does not publish a separate "supplemental" rate the way California or New York do — employers withhold at the same statutory 3.07% rate that applies to all PA-source wages, so default state withholding and your actual PA liability are usually identical on the state side.
If your marginal federal bracket is higher than the 22% supplemental rate, your employer is under-withholding on the federal side — and you owe the difference at filing time. The Pennsylvania state piece typically washes; the federal gap shows up on every PA vest.
Worked examples (Pennsylvania, 2025)
These three scenarios use the EquityTax calculator with the inputs shown. The math is identical to what you'll see when you click through to the calculator.
Example 1 — Junior IC, single filer
Inputs: $120K salary, single filer, 100 RSUs vesting at $80 FMV ($8,000 RSU income).
Result:
- Federal withholding: $1,760
- Pennsylvania withholding: $245.60
- Estimated total tax on the vest: $2,777.60
- Shortfall vs default withholding: $160
The 22% federal default closely matches the 24% federal marginal rate at this income level, so the gap is small — $160. Pennsylvania is a flat tax, so default state withholding (3.07% × $8,000 = $245.60) equals the actual PA liability on the vest. No state shortfall.
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Example 2 — Mid-level IC, married filing jointly
Inputs: $200K salary, married filing jointly, 400 RSUs vesting at $120 FMV ($48,000 RSU income).
Result:
- Federal withholding: $10,560
- Pennsylvania withholding: $1,473.60
- Estimated total tax on the vest: $12,925.60
- Shortfall vs default withholding: $196
Total household income is $248K, which puts this couple in the 24% federal bracket. The 22% supplemental rate is close but still short by 2 percentage points on the RSU income. Pennsylvania contributes a clean $1,473.60 (3.07% × $48,000), with no state-side gap.
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Example 3 — Senior IC, married filing jointly
Inputs: $350K salary, married filing jointly, 1,500 RSUs vesting at $200 FMV ($300,000 RSU income).
Result:
- Federal withholding: $66,000
- Pennsylvania withholding: $9,210
- Estimated total tax on the vest: $109,695.50
- Shortfall vs default withholding: $27,435.50
This is where Pennsylvania RSU earners get hurt. Total household income lands at $650,000, deep into the 35% federal bracket. The employer withholds at the 22% supplemental rate, so on $300,000 of RSU income the federal gap alone is $27,435.50. Pennsylvania state tax is a clean $9,210 (flat 3.07%), and there's also an estimated $1,920.49 underpayment penalty if no quarterly estimate is made. Total owed at filing: $29,355.99.
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Why employer withholding usually isn't enough in Pennsylvania
The gap is almost entirely federal, not state. Pennsylvania's flat 3.07% means employer supplemental withholding lines up with actual state liability for every vest size, every filing status, every income level. The federal supplemental rate, by contrast, is a fixed 22% — and the moment your total income crosses into the 24%, 32%, 35%, or 37% brackets, your employer is under-withholding on RSU income.
The fix is straightforward and depends on the size of the gap:
- Adjust your W-4 so your paycheck withholding picks up the difference across the year (IRS W-4 instructions).
- Make a quarterly estimated payment if the shortfall is concentrated around a single vest date.
- Sell-to-cover at vest — if your broker offers it, this can absorb the federal gap automatically; the state gap (3.07%) usually doesn't need separate action.
The 22% federal supplemental rate is a default — not your actual marginal rate. If your total income (salary + RSU) puts you in the 32%, 35%, or 37% bracket, the federal under-withholding alone can dwarf your Pennsylvania state liability.
How the Pennsylvania RSU tax calculator handles state and federal math
The Pennsylvania calculator uses Pennsylvania's actual 2025 flat 3.07% rate from the PA Department of Revenue, not a generic state placeholder. Because Pennsylvania has no progressive brackets, the state portion of the engine is a straight multiplication on vest-day RSU income — but the federal side still walks the full 2025 IRS bracket table for your filing status, which is where the real shortfall comes from. The engine does not currently model local Earned Income Tax — Philadelphia residents in particular face an additional city Wage Tax on RSU compensation that should be layered on top of the 3.07% state number.
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FAQ
Does Pennsylvania charge a higher rate on RSU income than on regular salary? No. Pennsylvania uses a single flat 3.07% rate on all individual compensation, including RSU vesting income. There is no separate supplemental rate or surtax on equity compensation at the state level.
Why is my Pennsylvania RSU shortfall almost always zero? Because Pennsylvania withholding (3.07% flat) equals Pennsylvania liability (3.07% flat) on the RSU income. The shortfall you see on Pennsylvania RSU vests is almost entirely federal — driven by the 22% supplemental rate being lower than your real marginal federal bracket.
Do I owe Philadelphia wage tax on RSU vests? If you live in or work in Philadelphia, yes — the city Wage Tax applies to RSU compensation in addition to the 3.07% PA state tax. Most other PA municipalities also levy a local Earned Income Tax that applies to RSU income. Verify the current resident/non-resident rates with the Philadelphia Department of Revenue and confirm local withholding with your employer.
When do I need to make a quarterly estimated payment in Pennsylvania? If you expect to owe more than $1,000 at filing after withholding and credits, the IRS safe-harbor rules generally require federal estimated payments. For most Pennsylvania RSU earners, the federal gap is the trigger — the 3.07% state piece is already covered by default withholding.
Sources
- IRS Publication 525, Taxable and Nontaxable Income — RSU treatment, fair-market-value rules.
- IRS Publication 15, Employer's Tax Guide — federal supplemental withholding rate (22% / 37%).
- Pennsylvania Revenue Department — state flat-tax rate and equity-comp guidance.
- EquityTax Pennsylvania RSU Calculator (internal engine, last verified 2026-05-09).
Tax Disclaimer: This content is for educational purposes only. Always consult with a licensed tax professional or certified public accountant before making financial decisions related to equity compensation, tax planning, or investment strategies.
Estimate only — not financial or tax advice. Consult a qualified CPA before making decisions about exercising stock options, selling equity, or other financial moves.