What Is Pennsylvania Tax Liability on PA-40 Line 12?

Line 12 of the PA-40 is your Pennsylvania tax liability for the year: the flat 3.07% state income tax applied to your adjusted taxable income from Line 11.¹ Multiply Line 11 by 0.0307 and the result goes on Line 12. On $60,000 of taxable income, that figure is $1,842. This is your gross state tax before any withholding, estimated payments, or credits are counted, so it is the starting point for what you owe or get back, not the finish line.

How the Line 12 Math Works

Pennsylvania imposes a single flat rate of 3.07% on all taxable income, regardless of how much you earn.² There are no graduated brackets and no phase-outs. Take Line 11 (Adjusted PA Taxable Income), multiply by 0.0307, and enter the product on Line 12.

A few quick examples:

$35,000 taxable income × 0.0307 = $1,074.50
$50,000 taxable income × 0.0307 = $1,535.00
$85,000 taxable income × 0.0307 = $2,609.50

The arithmetic is trivial. The hard part is making sure the number you plug into it, your Line 11 figure, actually reflects what Pennsylvania taxes and nothing more.

What Counts Toward Your Taxable Income

Pennsylvania doesn’t tax one lump sum of “income.” It breaks taxable income into eight separate classes, each with its own rules for what qualifies and what you can deduct inside it.³ The classes are compensation; net profits from a business or profession; net gains from the sale of property; rents, royalties, patents, and copyrights; dividends; interest; gambling and lottery winnings (excluding noncash Pennsylvania State Lottery prizes); and net income from estates and trusts.

You report each class on its own schedule and then combine the totals on the PA-40 to reach Line 9 (Total PA Taxable Income) and eventually Line 11, which is what feeds Line 12.¹

One rule trips up filers coming from a federal mindset: Pennsylvania does not let you offset a loss in one class against income in another. A capital loss on stock cannot reduce your wages. A rental loss cannot reduce business profits. Each class stands on its own, and a loss within a class can only zero out that class, never cross over.

Income Pennsylvania Doesn’t Tax

Several common income types are completely exempt from the 3.07% rate, and failing to exclude them inflates your Line 12 figure for no reason. Social Security benefits aren’t taxed in Pennsylvania. Distributions from qualifying retirement plans such as 401(k)s and IRAs are also fully exempt once you receive them in retirement.⁴ Employer-sponsored pension income is generally not taxable if you retired after meeting your plan’s eligibility requirements based on age, years of service, or disability. Military pay earned on active federal duty outside Pennsylvania is excluded from the compensation class.

These exemptions are the main reason your Pennsylvania taxable income often looks very different from your federal adjusted gross income. Before you drop a W-2, 1099, or 1099-R figure into a class on the PA-40, confirm the amount is one Pennsylvania actually taxes.

Tax Forgiveness Can Reduce Line 12 to Zero

Pennsylvania’s Tax Forgiveness program can eliminate part or all of your Line 12 liability if your income falls below certain thresholds. You claim it by filing Schedule SP alongside your PA-40. The program uses a sliding scale: depending on your eligibility income and the number of dependents you claim, you may receive 100% forgiveness or a partial percentage down to 10%.⁵

For an unmarried filer with no dependents, full forgiveness applies when eligibility income does not exceed $6,500. The threshold climbs significantly with dependents: an unmarried filer with two children qualifies for 100% forgiveness at up to $25,500 in eligibility income. Married filers have higher thresholds across the board. A married couple with two dependents can receive full forgiveness at up to $32,000, with partial forgiveness extending to $34,250.⁵

This program is often overlooked, especially by filers who use free software and skip through the optional schedules. If your household income is modest, Schedule SP is worth completing even for partial relief. A 50% forgiveness rate on a $1,000 Line 12 liability saves $500.

Credits and Payments That Reduce What You Owe

Line 12 is the gross number. Several lines below it bring you down to the actual balance due or refund.

Credit for Taxes Paid to Other States

If you live in Pennsylvania but earned income in another state and paid that state’s income tax, you can claim a credit on PA Schedule G-L to avoid being taxed twice on the same earnings. The credit equals the lesser of what you actually paid the other state or 3.07% of the income sourced to that state under Pennsylvania’s rules.⁶ If you worked in a state with a higher tax rate, you won’t get credit for the full amount paid, just up to what Pennsylvania would have charged on that income. Attach a copy of the other state’s return and your W-2s to your PA-40, or the credit will be disallowed.

Withholding and Estimated Payments

Lines 13 through 15 reconcile what you have already paid during the year against your Line 12 liability.

Line 13 reports total Pennsylvania tax withheld. This comes from Box 17 of your W-2 and also includes any PA tax withheld from gambling winnings (W-2G), retirement distributions (1099-R), or contractor payments (1099-NEC and 1099-MISC).
Line 14 captures any overpayment from last year’s PA-40 that you directed toward this year’s taxes. One caveat: if you originally chose the carryover but later requested and received a refund of that amount, you cannot also claim it on Line 14.¹
Line 15 reports quarterly estimated payments you made during the year using Form PA-40 ES. If you’re self-employed or earn substantial income without withholding, these are how you stay current with the state throughout the year.

The sum of Lines 13, 14, and 15 (along with certain other credits on later lines) is subtracted from Line 12 to determine your balance due or refund.¹ If the total exceeds Line 12, you overpaid and can claim a refund or carry the excess forward.

Underpayment Safe Harbors

If most of your income doesn’t have Pennsylvania tax withheld from it, calculating Line 12 at filing time can produce a nasty surprise: an underpayment penalty on top of the balance owed. You avoid that penalty by meeting any one of these safe harbors during the year:⁷

Your timely payments, withholding, and credits total at least 90% of the tax actually due on income earned in each installment period.
Your total timely payments equal at least the tax calculated on last year’s income using the current year’s rate. This safe harbor doesn’t apply if you didn’t file a return last year or filed as a part-year resident.
Your prior-year tax liability at the current rate, minus any Tax Forgiveness credit, was less than $292.

Estimated payments are made quarterly using Form PA-40 ES.⁸ Self-employed filers and anyone with significant income not subject to withholding should budget for them throughout the year rather than waiting until April to confront Line 12.

One last boundary worth naming: your Line 12 number covers state tax only. Nearly every municipality and school district in Pennsylvania also imposes a local earned income tax on compensation and net profits, collected separately from the PA-40. That bill is in addition to whatever Line 12 says you owe.

1
Pennsylvania Department of Revenue. 2025 Pennsylvania Personal Income Tax Return Instructions
2
Pennsylvania General Assembly. Pennsylvania Code 72 PS 7302 – Imposition of Tax
3
Pennsylvania General Assembly. Pennsylvania Code 72 PS 7303 – Classes of Income
4
Department of Revenue. Do I Have to Pay PA Income Tax on My Retirement Pension
5
Commonwealth of Pennsylvania. Tax Forgiveness
6
Department of Revenue. Deductions and Credits
7
Department of Revenue. Income Subject to Tax Withholding, Estimated Payments, Penalties, Interest, and Other Additions
8
Pennsylvania Department of Revenue. 2026 PA-40 ES – Declaration of Estimated Personal Income Tax