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You found the right person. Offer signed. Start date set. Then your CFO emails you at 11pm: “Did we get the I-9 done? What about state withholding? Are we set up for direct deposit yet?”
Most hiring teams underestimate new hire paperwork until something breaks. A missed I-9 turns into a federal audit. A missing state withholding form shows up as a compliance fine three months later. A handshake without a signed offer becomes a wrongful termination suit when the relationship sours.
Here’s the promise: by the time you finish this checklist, you’ll know exactly which documents to send before Day 1, which to collect on Day 1, and which to handle in the first 90 days. We’ll cover federal forms, state-by-state quirks, contractor-specific paperwork, and what changes the moment you start hiring outside the US. Every section links to a free template you can copy.
Let’s start with the documents your business is legally required to have in a folder before that new employee logs in.
The 9 Documents Every US Employer Must Collect
Federal law requires specific paperwork for every W-2 employee. Skip any of these and you risk fines, audits, or worse — a misclassification claim that retroactively turns your contractor into an employee with back taxes attached.
1
Signed Offer Letter
The offer letter is your first defense against employment disputes. It documents start date, role, compensation, at-will status, and contingencies (background checks, drug screening, reference verification).
A good offer letter takes 20 minutes to draft and saves you in court. We have 12 free offer letter templates organized by role and hire type.
When to send: Before the candidate accepts. Make the offer contingent on background checks if applicable.
see our offer letter template guide for full-time, part-time, contractor, and executive examples.
2
Form I-9 (Employment Eligibility Verification)
USCIS requires Form I-9 for every new hire — citizen or not, full-time or part-time. The employee fills out Section 1 by their first day. You complete Section 2 within three business days of the start date.
A SaaS company in Austin grew from 6 to 32 employees in 18 months. Their HR coordinator did everything right except this: she let employees fill out I-9s “when they got around to it.” When ICE audited two years later, 11 of 32 forms were incomplete. The fine: \$26,400. The employees stayed; the budget didn’t.
Common mistakes: Missing the 3-business-day deadline. Accepting a single document when two are required. Failing to keep I-9s for the longer of 3 years after hire or 1 year after termination. The official USCIS I-9 page has the current form and instruction set.
3
Form W-4 (Federal Tax Withholding)
The W-4 tells you how much federal income tax to withhold from each paycheck. The 2020 redesign eliminated allowances and added five steps for accuracy. Most employees just sign it and check Step 1 — that’s fine.
What you do: Run the W-4 through your payroll system. What you don’t do: Tell employees how to fill it out. Tax advice opens you up to liability.
The IRS W-4 form is updated each January. Always pull the current year’s version.
4
State Tax Withholding Form
This is where most checklists fall apart. Every state with income tax has its own withholding form. California uses DE-4. New York uses IT-2104. Pennsylvania uses REV-419. Texas, Florida, and 7 other no-income-tax states need nothing here.
If your employee works in one state but lives in another (very common with remote work), you may need both forms. When in doubt, default to “withhold for the work state.”
5
Get the routing number, account number, and a voided check. Most payroll platforms now collect this directly from the employee’s bank login — faster, fewer errors, no paper.
6
Emergency Contact Information
Two contacts minimum. Include relationship to the employee (spouse, parent, friend) and at least one phone number that isn’t the employee’s own.
7
Benefits Enrollment Forms
Health insurance, dental, vision, 401(k), HSA, FSA, life insurance, disability — every benefit you offer needs its own enrollment form. Most employees waive at least one. Document every waiver in writing; you don’t want them claiming they were never offered coverage.
ERISA requires you to retain benefits paperwork for 6 years. Plan accordingly.
8
Employee Handbook Acknowledgment
The handbook itself isn’t legally required (in most states), but the acknowledgment is your proof that the employee received and read your policies on harassment, code of conduct, leave, and at-will employment. One signed page does more for your legal posture than the 80-page handbook itself.
9
Confidentiality Agreement (NDA)
If the new hire will see customer data, source code, financial models, or strategy documents — and they almost always will — you need an NDA signed before access.
We’ve put together free NDA templates for both employee and contractor relationships in our NDA template guide.
Day-by-Day Onboarding Paperwork Timeline
Here’s how the documents distribute across the first 90 days. Send the Day-1 packet 5 business days before the start date so the employee has time to review.
Before Day 1 (Send 5 Days Early)
- Signed offer letter (already complete from hiring stage)
- Welcome email with first-day logistics
- Form W-4 (pre-filled with their name and SSN — they finish it)
- State tax withholding form
- Direct deposit form
- Benefits enrollment packet
- Employee handbook with acknowledgment page
Why send early? Reading these on Day 1 wastes their first impression of your company. Reading them at home means they actually understand what they’re signing.
Day 1
- Form I-9 Section 1 (must be signed on or before first day)
- Verify identity documents for I-9 Section 2
- Equipment receipt and acceptable use policy
- IT access agreement (passwords, two-factor, allowed software)
- Emergency contact form
- NDA signed and witnessed
- Photo for company directory
This is the most paperwork-heavy day. Block 90 minutes on the calendar. Make it the first thing they do — coffee, paperwork, then meet the team.
Within 3 Business Days
- I-9 Section 2 complete (federal deadline — no exceptions)
- Payroll system entry confirmed (test deposit, \$0.01 to the account)
- Benefits enrollment finalized
Within 30 Days
- Probation period start date documented (if your offer letter included one)
- 30-day check-in notes filed
- Any state-specific notices delivered (e.g., California Wage Theft Prevention Act notice)
Within 90 Days
- Performance baseline documented (this becomes the foundation for performance reviews)
- All training completion certificates filed
- Probation extension or conversion documented in writing
- Updated emergency contacts confirmed
State-by-State Paperwork Variations
Here’s where employers in multiple states get tripped up. Federal forms are the same nationwide. State forms aren’t.
California
The Wage Theft Prevention Act notice is mandatory at hire and at every pay rate change. California also requires written notice of paid sick leave entitlement (1 hour per 30 worked, capped at 48 hours). Add a separate harassment training acknowledgment if you have 5+ employees.
New York
Section 195.1 wage notice is due at hire — and the employee must sign and you must keep a copy in their language if not English. The Sexual Harassment Prevention Act mandates annual training documented in writing. NYC adds the Earned Sick and Safe Time Act notice on top.
Massachusetts
Anti-harassment policy distribution is required at hire and annually. Massachusetts Paid Family and Medical Leave (PFML) notices must be signed and dated.
Texas
Texas Workforce Commission requires no specific hire-time notices, but you’ll want a written at-will acknowledgment given Texas’s strict employment-at-will doctrine.
Multistate Remote Workers
If your employee works from home in Tennessee but your company is registered in Delaware, you need to register as a foreign employer in Tennessee, withhold Tennessee taxes (or note no income tax), and follow Tennessee’s hire-notice requirements. This usually means setting up state withholding accounts in 6 to 8 weeks.
A 12-person fintech startup hired its first remote engineer in Oregon. The cofounders didn’t realize Oregon’s Department of Revenue requires foreign employers to register before the employee’s first paycheck. Three months in, they got a notice and a \$1,200 late filing penalty. The fix took 4 hours; it should have taken 30 minutes upfront.
If you’re scaling fast and adding remote employees in multiple states, this is exactly the moment to consider whether running payroll yourself is still a good use of your time. A US PEO handles state registration; an EOR handles it plus benefits and compliance.
Paperwork For Contractors (1099) is Completely Different
US tax law draws a hard line between W-2 employees and 1099 contractors. The paperwork follows the line.
For a contractor, you need: a signed contractor agreement, Form W-9 (not W-4), an NDA if they’ll access proprietary information, and Form 1099-NEC at year-end if you paid them more than \$600.
You do NOT collect: I-9, W-4, state tax withholding, direct deposit (they invoice you), benefits enrollment, or handbook acknowledgment. Contractors are not employees and treating their paperwork like employee paperwork is one of the fastest ways to trigger a misclassification claim.
If you’re not sure which category your worker belongs in, our 1099 vs W-2 guide walks through the IRS classification test (behavioral, financial, and relationship factors) plus the cost differences and misclassification penalties.
The IRS estimates that 30% of US businesses misclassify at least one worker. Penalties range from \$50 per W-2 not filed to \$1,000+ per worker in willful misclassification cases — plus back taxes, interest, and unemployment insurance contributions.
What Changes When You Hire Internationally
US employment paperwork is built around US tax law. Hire a developer in Lisbon and you can’t send them a W-4. The whole packet changes. For an international hire, you typically need:
- A local employment contract in the local language (mandatory in France, Belgium, Quebec, and most of Latin America)
- Local equivalent of W-4 (income tax withholding declaration in the local format)
- Social security registration in the country (e.g., NIF in Portugal, NIE in Spain, INSS in Brazil)
- Statutory benefits enrollment (varies wildly — Mexico has IMSS, Infonavit, and PTU profit-sharing all on Day 1)
- Local data privacy notices (GDPR consent forms in the EU, LGPD in Brazil, PIPEDA in Canada)
- Work authorization documentation if the employee isn’t a citizen of their work country
Setting up a legal entity in a new country to handle this paperwork takes 3 to 9 months and runs \$20,000 to \$60,000 in setup fees. It’s also irreversible without a wind-down process. Most companies hiring their first 1 to 10 international employees use an Employer of Record (EOR) service instead — the EOR is the legal employer in-country, runs all the paperwork, and pays the employee. You direct their work and pay the EOR a flat fee per employee per month.
If you’re hiring abroad, see our country-specific guides for hiring process, tax forms, statutory benefits, and timeline. We have similar guides live for Canada, Mexico, India, Brazil, Philippines, and 162 other countries.
Common New Hire Paperwork Mistakes (And Fixes)
After auditing hundreds of new-hire packets across our client base, the same five mistakes keep showing up.
Sending Paperwork on Day 1
Hands the new hire a stack of forms while their badge isn’t even active. They’re stressed, they’re rushed, they sign without reading.
👉🏻 THE FIX: Send the packet 5 business days early with a “please read and complete” note.
Using The Wrong Year's W-4 or I-9
The IRS updates the W-4 annually. USCIS updates the I-9 every few years. Old forms are technically invalid even if no one notices for a while.
👉🏻 THE FIX: Pull both forms fresh from the official sites at the start of every quarter.
Letting Contractors Fill Out W-4s
A 1099 contractor never fills out a W-4. If yours did, you’re documenting that you treat them as an employee — the exact thing the IRS looks for in misclassification audits.
👉🏻 THE FIX: Contractors fill out W-9, not W-4.
Not Collecting Handbook Acknowledgments
The handbook is only as legally protective as the signed acknowledgment. Without that signature, you can’t prove the employee was on notice about your policies — meaning your harassment, leave, and at-will policies become much harder to enforce.
👉🏻 THE FIX: Have every new hire sign and date the acknowledgment page before their first day ends, and store it in their personnel file immediately.
Forgetting State Forms When An Employee Moves
Remote employees move. When they do, you need to register in the new state, update their state withholding, and confirm benefits eligibility.
👉🏻 THE FIX: Ask every remote hire to notify HR within 5 days of any address change.
Your New Hire Paperwork Checklist (download)
We’ve packaged everything in this article into a single checklist. It includes Day-1 packet, federal and state forms by jurisdiction, contractor variations, international hire requirements, and the 90-day timeline. Save it as your master template and tweak it for your company’s policies.
The checklist is free and editable in Google Docs and Word. Use it for your next hire and tell us if you’d add anything — we update it quarterly based on customer feedback.
What To Do Next
Three takeaways to put into action this week:
- Audit your last hire’s paperwork. Pull their file and check it against the 9 required documents above. Anything missing is a compliance gap; fix it now while it’s still small.
- Build a Day-1 packet template. Spend 90 minutes assembling your offer letter, NDA, I-9, W-4, state withholding form, direct deposit form, benefits enrollment, and handbook acknowledgment in one shareable folder. Reuse it forever.
- Decide your international plan before you need it. If hiring abroad is even on the 12-month horizon, choose your model (own entity vs. EOR) now. Setting up an entity reactively in 30 days means costly mistakes; setting it up proactively in 90 days means a clean operation.
If you’re scaling internationally and want to skip the legal-entity gauntlet, see how an Employer of Record handles all this paperwork in 30+ countries — including local contracts, statutory benefits, and tax forms.
Have a question we didn’t cover? Ping us. We update this guide every quarter and the best updates always come from real-world hiring problems readers send our way.
