Pennsylvania Form UC-1, formally titled the Employer’s Report to Determine Liability, is the registration document every Pennsylvania employer must file with the Pennsylvania Department of Labor & Industry to open an Unemployment Compensation (UC) tax account, receive a seven-digit PA UC employer account number, and begin paying state unemployment contributions under the Pennsylvania UC Law (43 P.S. §§ 751–919). The current version is folded into the PA Online Business Tax Registration on myPATH, which replaced the legacy paper PA-100 enterprise packet, and the Department’s most recent UC employer guidance carries a 2025 revision date that you should confirm at the top of the form before you start.
If you miss the registration window or check the wrong box, the consequences land hard. Pennsylvania assesses interest at 1% per month on unpaid contributions, civil penalties under Section 802.1 of the UC Law, and a higher “newly liable” tax rate that can stick with the employer for three years. Roughly 300,000 Pennsylvania employers file UC tax reports each quarter, and the Office of UC Tax Services reports that registration errors on the UC-1 are among the top three reasons new employer accounts get flagged for manual review.
- 📋 How to fill out every field, box, and signature line on PA Form UC-1 in order
- 🧾 Three real filled-out examples for a sole proprietor, a successor LLC, and a nonprofit
- 🗓️ Exact deadlines, fees, and penalties under the Pennsylvania UC Law
- 💻 How to file through UCMS online, by mail, by fax, or in person
- 🚫 The 12 most common UC-1 mistakes and how each one delays your account number
What Pennsylvania Form UC-1 Is and Who Must File It
Pennsylvania Form UC-1 is the employer-liability questionnaire that the Office of UC Tax Services uses to decide whether your business is “subject” to the state’s Unemployment Compensation Law and, if so, when liability began. The form gathers your legal name, federal employer identification number (FEIN), business structure, NAICS industry code, Pennsylvania start date, employee count, gross wages paid, and any successor or predecessor relationship. Today the questions appear inside the PA Online Business Tax Registration wizard rather than on a stand-alone paper form, but the field labels and box numbers come straight from the original UC-1.
Every employer that pays wages for services performed in Pennsylvania must file. That includes for-profit corporations, LLCs, partnerships, sole proprietors with at least one W-2 employee, agricultural employers paying $20,000 or more in a calendar quarter, household employers paying $1,000 or more in a calendar quarter, and 501(c)(3) nonprofits with four or more employees in 20 different weeks. Governmental entities and federally recognized tribes also file, even though they may elect a reimbursable financing method instead of contributory rates.
The statute behind the form is the Pennsylvania Unemployment Compensation Law, specifically Sections 4(j), 301, and 304, which together define “employer,” “employment,” and the duty to register. The agency that receives the form is the Department of Labor & Industry, Office of UC Tax Services, based in Harrisburg. Once liability is confirmed, the Department issues a New Employer Confirmation Letter (Form UC-1408) and a Contribution Rate Notice (Form UC-657).
Before You Start: Documents and Information You Need
Open the registration cold and you will hit a wall on the third screen. The wizard does not let you save partway through unless you are signed in, and a missing FEIN or NAICS code forces a full restart. Gather everything below before you log into myPATH or open the paper packet.
- Federal Employer Identification Number (FEIN). Without it the system cannot match your account to IRS records, and the registration will fail at the FEIN validation step. Apply first using IRS Form SS-4 if you do not have one.
- Legal business name and any trade name (DBA). The legal name must match the SS-4 confirmation letter exactly, because Pennsylvania cross-checks against the IRS Business Master File.
- Pennsylvania Department of State entity number. Corporations, LLCs, and LPs must be registered with the PA Department of State before they can register for UC tax.
- Date of first Pennsylvania payroll. This drives your liability date and determines the first quarter you owe contributions.
- NAICS code for your primary activity. The code sets your industry classification and influences the experience-rated tax rate after three years.
- Owner, partner, officer, or member identification. You need each person’s full legal name, title, home address, Social Security number, and ownership percentage.
- Predecessor information if you bought, merged with, or inherited an existing PA business. Provide the seller’s PA UC account number and date of acquisition so the Department can transfer the experience rate.
- Estimated gross wages and number of employees for the first four quarters. The Department uses these figures to schedule your first UC-2 / UC-2A quarterly report.
- Bank routing and account number if you plan to enroll in ACH debit payments inside UCMS.
- A working email address and phone number for the contact person, because all confirmations, rate notices, and audit letters route through that email.
Where to Get the Form and How to Access It
You will not find a fillable PDF labeled “UC-1” on the Department’s website anymore. Pennsylvania moved the registration online in 2017, so the modern path is the PA Online Business Tax Registration on myPATH. The myPATH portal is run by the Department of Revenue but feeds the UC-1 data directly to the Office of UC Tax Services, which then issues your seven-digit PA UC employer account number, usually within five business days.
If you prefer paper, request the legacy PA-100 enterprise packet by calling Employer Tax Services at 866-403-6163, or download supporting forms from the Unemployment Compensation Forms library. Paper filings take 10 to 15 business days to process and cannot be expedited. Out-of-state employers expanding into Pennsylvania often pick paper because it lets them attach a cover letter explaining nexus, but the trade-off is a longer wait.
After registration, all ongoing filings happen inside the UCMS portal at uctax.pa.gov. You will create a Keystone/User ID, choose three security questions, and link the new UC account number to that login. The same portal hosts quarterly tax reports, payment of contributions, rate appeals, and the Employer’s Handbook (Form UCP-36), which is the agency’s authoritative interpretation guide.
Step-by-Step: How to Fill Out Pennsylvania Form UC-1 Line by Line
The UC-1 questionnaire breaks into five logical groupings: business identity, ownership, Pennsylvania activity, liability questions, and certification. Work through each H3 below in order, because the wizard hides later questions until earlier answers validate.
Section 1, Box A — Legal Business Name
Box A asks for the exact legal name of the entity that pays wages, not the brand customers see. Type the name in ALL CAPS the way it appears on your IRS Form SS-4 confirmation letter, including punctuation such as commas before “INC” or “LLC.” For example, MARIA LOPEZ ENTERPRISES LLC writes her name as it appears on the SS-4, not as it appears on her storefront sign.
A common edge case is a single-member LLC that the IRS treats as a disregarded entity. Pennsylvania still wants the LLC’s legal name in Box A, not the owner’s personal name, because the LLC is the employer for UC purposes. The most frequent mistake is entering the trade name (DBA) here, which causes a name mismatch with the IRS and a 30-day delay on account issuance. The misconception that “the agency will figure it out” is wrong; the matching algorithm is automated and unforgiving.
Section 1, Box B — Federal Employer Identification Number (FEIN)
Box B asks for the nine-digit FEIN issued by the IRS. Enter all nine digits with no dash, so 12-3456789 becomes 123456789. Marcus, an employer reporting his first quarterly wages for a Lancaster bakery, types 874512309 exactly the way it appears on his SS-4 letter.
If you are mid-application for a FEIN, do not guess or use a placeholder, because the system will reject the registration. The most damaging mistake on this field is reusing an FEIN from a closed sole proprietorship for a new corporation, which forces a manual unbundling that can take 60 days. Filers often think the PA UC account number replaces the FEIN; it does not, and the FEIN remains the identifier the IRS, the SSA, and Pennsylvania all share.
Section 1, Box C — Trade Name (DBA)
Box C captures the “doing business as” name the public sees on your storefront, invoices, and website. Leave it blank if the legal name is the only name you use. Lopez Cleaning Services would be entered exactly as registered with the PA Department of State fictitious-name search.
A nuance shows up for franchisees: enter only your portion of the brand name, such as Lopez Family Subway #4421, not the franchisor’s corporate name. The frequent mistake is entering a marketing slogan or social-media handle instead of the registered fictitious name, which produces a Form UC-1408 with the wrong public name. The misconception is that DBA registration with the county is enough; Pennsylvania requires a state-level fictitious-name registration for the DBA to be valid here.
Section 1, Box D — Mailing Address
Box D collects the address where the Department will mail rate notices, audit letters, and the New Employer Confirmation Letter. Use a deliverable USPS street address or P.O. Box, two lines maximum, with the ZIP+4 if you know it. Aisha, a Philadelphia accountant registering her new firm, enters 1500 MARKET ST STE 1200, PHILADELPHIA, PA 19102-2100.
If your business uses a third-party administrator (TPA) such as ADP or Paychex, enter the TPA’s mailing address here so claim and tax notices route to the people who handle them. The frequent mistake is entering a residential address that the postal carrier later marks “no mail receptacle,” which causes UC-657 rate notices to bounce and triggers the maximum new-employer rate by default. A common misconception is that an email address can replace a physical mailing address; it cannot, because Pennsylvania UC Law still requires paper service for certain determinations.
Section 1, Box E — Physical Pennsylvania Location
Box E asks where the work actually happens, which can differ from the mailing address. Enter the street address of the worksite, warehouse, or office where your employees report. A remote-only employer enters the address of the employee’s home worksite, because Pennsylvania localizes employment by where the service is performed.
The edge case is a construction or trucking company with no fixed Pennsylvania location; in that case, enter the address where dispatch or supervision occurs. The most common mistake is repeating the mailing address when work actually happens elsewhere, which can misroute the wage data to the wrong county for federal Bureau of Labor Statistics reporting. The misconception that “physical location does not matter for tax” is false; it determines local tax jurisdiction and Career Link service area.
Section 1, Box F — NAICS Industry Code
Box F asks for the six-digit North American Industry Classification System code that best describes your primary revenue activity. Look up the code at the U.S. Census NAICS lookup and enter it without spaces, such as 722511 for a full-service restaurant. Janet, opening a 22-employee home-health agency, enters 621610.
Many businesses operate in two industries; pick the code for the activity that produces the largest share of gross revenue. The frequent mistake is choosing a code that matches the company’s name rather than its activity, which can put you in the wrong industry-average tax rate for three years. The misconception is that you can change the NAICS code freely later; you can request a change, but the Department audits the request and may apply the new rate prospectively only.
Section 2, Box G — Type of Organization
Box G is a check-the-box question with options for Sole Proprietor, Partnership, LLC, LLP, Corporation, S-Corporation, Nonprofit 501(c)(3), Governmental, and Other. Check exactly one box that matches your federal tax classification. Carlos, a single-member LLC owner who elected S-corporation taxation with the IRS, checks S-Corporation, not LLC.
The nuance is that Pennsylvania follows the federal classification, so a disregarded single-member LLC checks Sole Proprietor if no S-election is on file. The most common mistake is checking LLC when an S-election exists, which causes a mismatch with the Department of Revenue’s corporate net income tax registration. The misconception that nonprofits are automatically exempt from UC is wrong; 501(c)(3) employers with four or more employees in 20 weeks must register and may then elect reimbursable financing.
Section 2, Box H — Owners, Partners, Officers, or Members
Box H lists the humans behind the entity. For each person, enter full legal name, title, residential address, Social Security number, date of birth, and ownership percentage. A two-member LLC enters two rows that total 100% ownership; an S-corp enters every officer plus any shareholder owning 10% or more.
The edge case is a publicly traded parent that owns the Pennsylvania subsidiary; in that case, list the subsidiary’s officers, not the parent’s board. The frequent mistake is omitting a silent partner with a 25% stake, which the Department later discovers through Schedule K-1 cross-matching and can treat as a willful misstatement under Section 802.1. The misconception is that SSNs are optional; they are required, and refusal to provide them stops the registration.
Section 3, Box I — Date of First Pennsylvania Wages Paid
Box I is the single most consequential field on the form because it sets your liability start date. Enter the date in MM/DD/YYYY format, using the day the first Pennsylvania wage check cleared, not the hire date. Marcus paid his first baker on 03/14/2026, so he enters 03/14/2026 even though he hired her on March 1.
The nuance is bonuses or signing payments made before the regular payroll begins; those count as the first wages and pull the liability date forward. The most damaging mistake is entering the company’s formation date instead of the first-payroll date, which can backdate liability by months and trigger interest on contributions never owed. The misconception that “I will fix the date later” is dangerous; once the Department issues a rate, the date can only be changed through a formal redetermination request.
Section 3, Box J — Estimated Gross Wages, First Four Quarters
Box J asks for your best estimate of total gross wages, broken down by calendar quarter for the first 12 months. Enter whole dollars only, with no commas or cents. A bakery projecting $48,000 in Q1, $52,000 in Q2, $55,000 in Q3, and $60,000 in Q4 enters those four numbers in the four quarter boxes.
The edge case is seasonal employers; estimate honestly even if Q1 and Q4 are zero, because under-reporting expectations can suggest you are trying to avoid liability. The frequent mistake is entering net payroll instead of gross, which understates the wage base and can cause a 10% under-reporting penalty when actual UC-2A wages come in. The misconception is that the estimate locks you in; it does not, but it does set the schedule of expected quarterly reports.
Section 3, Box K — Number of Pennsylvania Employees
Box K wants a headcount of W-2 employees who have performed services in Pennsylvania, including part-time and seasonal workers, but excluding 1099 independent contractors. Count every name on your most recent payroll register. A nonprofit with 22 part-time aides enters 22, not the full-time-equivalent number.
The nuance is leased employees from a Professional Employer Organization (PEO); list them only if the PEO is not registered as a Pennsylvania UC client-level reporter. The most common mistake is treating misclassified 1099 workers as not employees; Pennsylvania uses the ABC test under Section 4(l)(2)(B) and will reclassify aggressively in audit. The misconception that owners do not count is partially true: sole proprietors and partners do not count, but corporate officers who draw wages do.
Section 4, Box L — Successor / Predecessor Information
Box L asks whether you acquired all or part of an existing Pennsylvania business. Check Yes or No. If Yes, enter the predecessor’s legal name, FEIN, PA UC account number, and date of acquisition. Carlos, who bought a print shop from a retiring owner, enters the seller’s seven-digit UC account number 1234567 and the closing date 01/15/2026.
The nuance is partial acquisitions, where you take over one branch but not the whole company; the Department prorates the experience rate based on the wage base transferred. The frequent and expensive mistake is checking No to dodge the predecessor’s higher rate, which is a SUTA-dumping violation under Section 301.1 of the UC Law and triggers the highest possible rate plus a penalty. The misconception that an asset-only purchase avoids successor status is wrong if you continue substantially the same business.
Section 4, Box M — Reimbursable Election (Nonprofits and Governments Only)
Box M lets eligible nonprofits and governmental entities elect to reimburse the UC trust fund dollar-for-dollar instead of paying contributions at a tax rate. Check the box if you want reimbursable status, and attach a written election letter on letterhead. A 22-employee nonprofit clinic checks Reimbursable and attaches a board resolution authorizing the election.
The election is irrevocable for two complete calendar years, so the nuance is to model your expected layoff frequency before electing; high-turnover nonprofits often pay more under reimbursement. The mistake is electing reimbursement without posting the required surety bond or escrow if the Department demands one under Section 1103. The misconception that reimbursement is “free” is wrong; you pay every dollar of benefits charged to your account, with no ceiling.
Section 5, Box N — Certification, Signature, Title, and Date
Box N is the perjury certification. The owner, a corporate officer, an LLC member, or a duly authorized officer must sign and date the form, and print their title. Aisha, the managing member of her firm, types her name AISHA WILLIAMS, title MANAGING MEMBER, and date 04/02/2026 into the e-signature pad.
The nuance is that a paid preparer or TPA cannot sign Box N alone; the Department requires a principal signature even when a payroll service prepares the form. The mistake of signing with an electronic signature image that does not match the typed name causes the system to flag the filing as unsigned. The misconception that an unsigned UC-1 will be processed and “fixed later” is false; it is returned without action, and the liability date keeps running against you.
Three Filled-Out Examples Using Real Scenarios
The three scenarios below show how three different Pennsylvania employers complete the same UC-1 questionnaire, with each table built from the actual field labels.
Scenario 1 — Maria Lopez, Sole Proprietor Hiring Her First Employee
| Form Section | What Maria Enters |
|---|---|
| Box A — Legal Name | MARIA LOPEZ |
| Box B — FEIN | 874100221 |
| Box C — Trade Name | LOPEZ CLEANING SERVICES |
| Box F — NAICS Code | 561720 (Janitorial Services) |
| Box G — Type of Organization | Sole Proprietor |
| Box H — Owner | Maria Lopez, 100%, SSN on file |
| Box I — First PA Wages | 02/01/2026 |
| Box J — Estimated Q1 Wages | $8,400 |
| Box K — Employees | 1 |
| Box L — Successor | No |
| Box N — Signature / Title | Maria Lopez, Owner, 02/05/2026 |
Scenario 2 — Carlos Rivera, Successor LLC Buying an Existing Print Shop
| Form Section | What Carlos Enters |
|---|---|
| Box A — Legal Name | RIVERA PRINTING LLC |
| Box B — FEIN | 933820145 |
| Box C — Trade Name | KEYSTONE QUICK PRINT |
| Box F — NAICS Code | 323111 (Commercial Printing) |
| Box G — Type of Organization | LLC, S-Corp election |
| Box I — First PA Wages | 01/16/2026 |
| Box K — Employees | 7 |
| Box L — Successor | Yes — predecessor UC #1234567, acquired 01/15/2026 |
| Box J — Estimated Annual Wages | $310,000 |
| Box N — Signature / Title | Carlos Rivera, Managing Member, 01/20/2026 |
Scenario 3 — Janet Park, Nonprofit Home-Health Agency Electing Reimbursable Status
| Form Section | What Janet Enters |
|---|---|
| Box A — Legal Name | KEYSTONE HOME HEALTH INC |
| Box B — FEIN | 462018774 |
| Box F — NAICS Code | 621610 (Home Health Care) |
| Box G — Type of Organization | Nonprofit 501(c)(3) |
| Box H — Officers | Janet Park (CEO), David Cho (CFO) |
| Box I — First PA Wages | 03/01/2026 |
| Box K — Employees | 22 |
| Box J — Estimated Annual Wages | $640,000 |
| Box L — Successor | No |
| Box M — Reimbursable Election | Yes, board resolution attached |
| Box N — Signature / Title | Janet Park, CEO, 03/04/2026 |
How to File the Completed Form
Pennsylvania accepts the UC-1 through four channels, but the agency strongly prefers online filing because the data flows directly into UCMS without rekeying.
- Online via myPATH. Go to mypath.pa.gov, pick Pennsylvania Online Business Tax Registration, complete the wizard, and submit. There is no filing fee. Processing takes three to five business days, and your proof of filing is the on-screen confirmation page plus the email confirmation; print or save both.
- By mail. Send the completed PA-100 packet to PA Department of Revenue, Bureau of Business Trust Fund Taxes, PO Box 280901, Harrisburg, PA 17128-0901. There is no fee. Processing takes 10 to 15 business days. Mail it certified, return-receipt requested, and keep the green card as proof of filing.
- By fax. Fax to 717-787-3708 with a cover sheet listing your FEIN and contact phone. Processing matches mail timing. Keep the fax confirmation page as proof.
- In person. Walk the packet into any PA Department of Revenue district office. No fee. Get the date-stamped copy and keep it as proof of filing.
There is no separate filing fee for the UC-1, but you must register within 30 days of becoming subject to the UC Law. Late registration triggers interest at 1% per month on contributions due, plus civil penalties under Section 802.1.
What Happens After You File
Once the Department validates your registration, it issues a New Employer Confirmation Letter on Form UC-1408 with your seven-digit PA UC employer account number, usually within five business days for online filings. The letter also lists your assigned filing schedule, which for almost all employers is quarterly, with reports due the last day of the month following each quarter.
A few weeks later, the Department mails the Notice of Pennsylvania Unemployment Compensation Responsibilities (Form UC-851) and the first Contribution Rate Notice (Form UC-657). New non-construction employers get a base rate of 3.689% on the first $10,000 of wages per worker for 2026, while new construction employers get a higher industry-average rate. After three full calendar years, your account becomes “experience-rated” and the rate adjusts based on your benefit-charge history.
From that point forward you file Form UC-2 and UC-2A every quarter through UCMS, report new hires to the PA New Hire Reporting Program within 20 days, and respond to separation questionnaires on Form UC-1609 when former employees file claims.
Mistakes to Avoid When Filling Out the Form
- Entering the trade name in Box A instead of the legal name causes an IRS name-mismatch and 30-day delay.
- Typing the FEIN with dashes triggers a validation error that kicks you out of the wizard.
- Using a residential address with no mailbox bounces the UC-657 rate notice and forces the maximum default rate.
- Picking a NAICS code that matches the brand name rather than the actual activity locks you into the wrong industry rate for three years.
- Checking LLC in Box G when an S-election is on file creates a mismatch with the Department of Revenue and slows account issuance.
- Omitting silent partners or 10% shareholders in Box H is treated as a willful misstatement under Section 802.1.
- Entering the formation date in Box I instead of the first-payroll date backdates liability and adds interest you do not actually owe.
- Reporting net wages instead of gross in Box J understates the wage base and can trigger a 10% under-reporting penalty.
- Excluding part-time or seasonal employees from Box K underestimates headcount and misroutes future audit selection.
- Checking No to a true successor relationship in Box L is a SUTA-dumping violation that brings the highest possible rate plus a penalty.
- Electing reimbursable status in Box M without modeling layoff exposure can cost a small nonprofit more than contributory rates would.
- Letting a TPA sign Box N without a principal officer’s signature causes the form to be treated as unsigned and returned.
Do’s and Don’ts
- Do copy your legal name straight from the IRS SS-4 letter to avoid mismatches that stall the file.
- Do apply for your FEIN first because the wizard will not accept a placeholder.
- Do estimate gross wages honestly, because under-reporting expectations invites scrutiny.
- Do save both the on-screen confirmation and the email confirmation as proof of filing.
- Do disclose every successor relationship in Box L, even partial acquisitions of one branch.
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Do sign Box N as a principal officer, owner, or member, never delegated to the TPA alone.
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Don’t enter your DBA in the legal-name box, because the agency cross-checks against the IRS BMF.
- Don’t guess a NAICS code; use the Census lookup tied to your largest revenue activity.
- Don’t elect reimbursable status without a board resolution and surety bond ready.
- Don’t treat 1099 contractors as non-employees if they fail the ABC test in Section 4(l)(2)(B).
- Don’t wait past 30 days from your first payroll, because interest starts accruing under Section 308.
- Don’t ignore the UC-851 responsibilities notice, because missed quarterly reports compound penalties fast.
Pros and Cons of Filing on Your Own vs. With Help
- Pro of filing yourself: No professional fees, which can save a small employer $300–$800 in setup costs.
- Pro of filing yourself: You learn the UC system firsthand, which helps with future quarterly reports.
- Pro of filing yourself: Faster turnaround when you control your own calendar inside myPATH.
- Pro of filing yourself: You retain direct control of the Keystone/User ID and never share credentials.
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Pro of filing yourself: Easier to correct errors immediately because you know exactly what you typed.
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Con of filing yourself: Successor and SUTA-dumping rules are complex, and a wrong answer in Box L is expensive.
- Con of filing yourself: NAICS coding and reimbursable-versus-contributory modeling require experience to optimize.
- Con of filing yourself: You must track 30-day deadlines, quarterly due dates, and rate-appeal windows alone.
- Con of filing yourself: Multistate employers may misallocate wages between Pennsylvania and a neighboring state.
- Con of filing yourself: Errors that look small at registration can lock in a higher tax rate for three years.
PA UC-1 vs. PA UC-2/UC-2A at a Glance
| Form | Purpose |
|---|---|
| UC-1 | One-time registration to determine employer liability and open the account |
| UC-2 | Quarterly Employer’s Report for Unemployment Compensation, summarizing total wages and contributions due |
| UC-2A | Quarterly Employee Wage Detail Report listing each employee’s SSN, name, and gross wages |
| UC-1609 | Employer Separation Information sent when a former worker files a claim |
| UC-657 | Annual Contribution Rate Notice issued each December for the next calendar year |
| UC-1408 | New Employer Confirmation Letter that delivers your seven-digit account number |
FAQs
Do I need a FEIN before I can file the PA UC-1?
Yes. The wizard validates your FEIN against the IRS Business Master File at the first step, so apply for one using IRS Form SS-4 before you start the Pennsylvania registration.
Is there a filing fee for the UC-1?
No. Pennsylvania does not charge to register for a UC tax account through myPATH, paper, fax, or in-person filing channels.
How long does it take to get my PA UC employer account number?
Yes, online filings are fastest, with most accounts issued in three to five business days; paper or fax filings take 10 to 15 business days.
Do I write my legal name or my DBA in Box A?
Yes, write only the legal name from your IRS SS-4 confirmation in Box A; the DBA goes in Box C, never Box A.
Should the FEIN in Box B include the dash?
No. Enter all nine digits with no dash, no spaces, and no leading letters; dashes cause an immediate validation failure.
Do I check LLC or S-Corporation in Box G if my LLC elected S-corp tax treatment?
Yes, check S-Corporation because Pennsylvania follows the federal classification, and a mismatch with the Department of Revenue stalls processing.
What date goes in Box I if I paid a signing bonus before regular payroll started?
Yes, the bonus counts as the first wages, so enter the bonus date in Box I, not the date your regular payroll cycle began.
Do I have to register if I only hire 1099 contractors?
No, unless they fail the ABC test in Section 4(l)(2)(B); if any worker fails the test, they are reclassified as employees and you must register.
Are nonprofits exempt from filing the UC-1?
No. Section 501(c)(3) employers with four or more employees in 20 different weeks must register, though they may elect reimbursable financing.
Can a payroll service or TPA sign Box N for me?
No. A principal owner, partner, member, or corporate officer must sign; a TPA may prepare the form but cannot certify it alone.
What happens if I miss the 30-day registration deadline?
Yes, interest at 1% per month accrues on unpaid contributions, and civil penalties under Section 802.1 of the UC Law may also apply.
Can I change my NAICS code in Box F later?
Yes, you may request a change through the Office of UC Tax Services, but the Department audits the request and typically applies any new rate prospectively.
Is the PA UC account number the same as my FEIN?
No. The PA UC number is a separate seven-digit identifier issued by the Department of Labor & Industry and used only for state UC purposes.
Do household employers need to file the UC-1?
Yes, household employers paying $1,000 or more in cash wages in any calendar quarter become subject to the UC Law and must register.
Where do I file the UC-1 if I prefer paper?
Yes, mail the PA-100 packet to the PA Department of Revenue, Bureau of Business Trust Fund Taxes, PO Box 280901, Harrisburg, PA 17128-0901, certified mail recommended.
Related reading
- How to Fill Out Pennsylvania Form DC-05 (w/Examples) + FAQs
- How to Fill Out Pennsylvania Form PA-100 (w/Examples) + FAQs
- How to Fill Out Pennsylvania Form PA-W3 (w/Examples) + FAQs
- How to Fill Out Pennsylvania Form REV-181 (w/Examples) + FAQs
- How to Fill Out Pennsylvania Form UC-2 (w/Examples) + FAQs
- How to Fill Out Pennsylvania Form UC-2A (w/Examples) + FAQs
- How to Fill Out Pennsylvania Form PA-40 X (w/Examples) + FAQs