How to Run Payroll for the First Time as a Startup

Running payroll for the first time feels like defusing a bomb while someone reads you tax code over the phone. One wrong move and you’re facing penalties, angry employees, or both. But here’s the reality: thousands of founders figure this out every month, and with the right preparation, your first payroll run can be surprisingly straightforward.

This guide walks you through everything you need to know before paying your first employee—from the legal registrations you can’t skip to the calculations that trip up most first-time employers. You’ll learn how to set up your payroll infrastructure correctly from day one, understand what taxes you’re responsible for withholding and paying, and choose whether to handle payroll manually or use software that automates the heavy lifting.

By the end, you’ll have a clear action plan for running compliant payroll, whether you’re paying one contractor-turned-employee or preparing to scale your team to twenty.

Why Payroll Complexity Catches Startups Off Guard

Most founders underestimate payroll because paying people seems simple: calculate hours, multiply by rate, send money. The reality involves federal withholding, state taxes (sometimes multiple states), Social Security contributions, Medicare, unemployment insurance, and potentially local taxes—all with different deadlines and filing requirements.

The compliance landscape has grown more complex over the past decade. The rise of remote work means many startups now have employees in multiple states before they hit ten team members. Each state has its own income tax rates, unemployment insurance requirements, and registration processes. California alone requires registration with four different state agencies before you can legally pay an employee.

Historically, small businesses relied on accountants or manual calculations using IRS Publication 15 (the Employer’s Tax Guide). This worked when businesses operated in single locations with stable workforces. Modern startups face a different challenge: rapid hiring, distributed teams, and equity compensation that doesn’t fit neatly into traditional payroll frameworks.

The penalty structure adds urgency. The IRS assesses approximately $7 billion in civil penalties annually for payroll tax violations. Late deposits can trigger penalties ranging from 2% to 15% of the unpaid amount, and willful failures can result in personal liability for founders—even if you’ve incorporated.

Understanding this context helps explain why payroll software has become essential infrastructure rather than a nice-to-have convenience.

Setting Up Your Payroll Foundation

Before you can run payroll, you need the legal infrastructure in place. Skipping these steps doesn’t just create compliance risk—it makes the actual payroll process impossible.

Federal Registration Requirements

Your Employer Identification Number (EIN) is the foundation of everything. If you incorporated your startup, you likely already have one. If not, apply through the IRS website—it takes about fifteen minutes and you receive the number immediately for online applications.

Next, register for the Electronic Federal Tax Payment System (EFTPS). All federal payroll tax deposits must go through this system. Registration takes about a week because the IRS mails you a PIN, so don’t wait until you’re ready to run payroll.

You’ll also need to verify your workers are legally authorized to work in the US by completing Form I-9 for each employee. This isn’t technically payroll-related, but you can’t legally employ someone without it, and audits often review I-9 compliance alongside payroll records.

State and Local Registration

Every state where you have employees requires separate registration. At minimum, you’ll register with:

State tax authority for income tax withholding
State unemployment agency for unemployment insurance
State disability program (in states that require it, like California, New York, and New Jersey)

Some cities—notably New York City, San Francisco, and Philadelphia—have additional local tax registration requirements. If you have employees working remotely, their home state determines tax obligations, not your company’s headquarters location.

Employee Documentation

Collect completed W-4 forms from every employee before their first paycheck. The W-4 tells you how much federal income tax to withhold. Many states also require state-specific withholding forms.

Set up personnel files containing offer letters, signed employment agreements, and benefits enrollment forms. These documents establish the employment relationship and compensation terms that drive your payroll calculations.

Calculating Payroll: The Numbers You Need to Know

The actual calculation process follows a consistent pattern, but the specifics depend on your employees’ situations and your state’s requirements.

Gross Pay Calculation

For salaried employees, divide annual salary by pay periods. A $120,000 annual salary paid semi-monthly equals $5,000 gross per paycheck. For hourly employees, multiply hours worked by hourly rate, including overtime calculations when applicable (typically 1.5x for hours over 40 in a week, though state rules vary).

Don’t forget to include bonuses, commissions, and other compensation. These are subject to the same tax withholdings as regular wages, though supplemental wages can use different withholding methods.

Federal Tax Withholding

Use the employee’s W-4 and IRS Publication 15-T to determine federal income tax withholding. The calculation considers filing status, number of dependents, and any additional withholding the employee requested. Payroll software handles this automatically, but understanding the inputs helps you verify accuracy.

FICA taxes—Social Security (6.2% up to the wage base limit of $168,600 in 2025) and Medicare (1.45% with no limit)—apply to every paycheck. You withhold the employee portion and pay a matching employer portion. High earners pay an additional 0.9% Medicare tax on wages above $200,000.

State Tax Withholding

Nine states have no income tax (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming), simplifying payroll for employees in those locations. The other 41 states plus DC each have their own rates, brackets, and withholding tables.

Some states use flat rates (Illinois at 4.95%), while others have progressive brackets (California ranges from 1% to 13.3%). State disability insurance, paid family leave, and other programs add further withholdings in certain states.

Arriving at Net Pay

Subtract all withholdings from gross pay: federal income tax, state income tax, Social Security, Medicare, and any voluntary deductions like health insurance premiums or retirement contributions. The remainder is net pay—what actually hits the employee’s bank account.

Choosing Your Payroll Method

You have three basic options for running payroll, each with different cost and complexity tradeoffs.

Manual Payroll

Technically possible but not recommended. You’d calculate every withholding using IRS and state publications, manually submit tax deposits through EFTPS and state systems, file quarterly and annual returns yourself, and handle all recordkeeping. The time investment is substantial—expect 2-4 hours per pay period for a small team—and error rates are high. One survey found that 40% of small businesses pay IRS penalties annually, with manual processing being a major contributor.

Accountant-Managed Payroll

Many CPAs and bookkeeping firms offer payroll services. This works well if you already have a trusted accountant and your payroll needs are simple. Expect to pay $150-$500 per month depending on complexity. The downside: you’re dependent on someone else’s timeline, and integration with your HR and benefits systems may be limited.

Payroll Software

Modern payroll platforms like Gusto, Rippling, and Deel automate calculations, tax filings, and payments. Prices typically start around $40-80 per month plus $6-12 per employee. For most startups, this represents the best balance of cost, compliance, and convenience.

Tools like Gusto are particularly popular with early-stage startups because they bundle payroll with benefits administration and basic HR features. Rippling offers deeper integration with IT and device management, useful for startups that want unified employee onboarding. For international teams, Deel and Remote handle global payroll and contractor payments across multiple countries.

Step-by-Step: Running Your First Payroll

Follow this sequence to execute your first payroll run successfully.

Step 1: Verify all registrations are active. Confirm your EIN is valid, EFTPS registration is complete, and all state registrations are finalized. Log into each system to verify access before you need to make payments.

Step 2: Enter employee information. Input each employee’s personal details, W-4 information, pay rate, and direct deposit information into your payroll system. Double-check Social Security numbers—transposed digits cause problems that surface months later.

Step 3: Set your pay schedule. Choose weekly, bi-weekly, semi-monthly, or monthly. Bi-weekly (26 pay periods) is most common. Some states mandate minimum pay frequencies, so verify your schedule complies with employee locations.

Step 4: Process the pay run. Enter hours for hourly employees, confirm salaries for exempt workers, and add any bonuses or adjustments. Review the preview carefully—gross pay, each withholding category, and net pay should all make sense.

Step 5: Approve and submit. Most payroll systems require explicit approval before processing. Once approved, the system calculates when to pull funds from your business account (typically 2-4 days before payday) and schedules direct deposits.

Step 6: Make tax deposits. If your payroll software doesn’t handle this automatically, deposit federal taxes through EFTPS by the required deadline (typically monthly for new employers, but semi-weekly once you exceed $50,000 in annual payroll taxes). State deadlines vary.

Step 7: Document everything. Save payroll reports, tax deposit confirmations, and any supporting calculations. You’ll need these records for at least four years.

Common Mistakes to Avoid

Missing tax deposit deadlines. Federal and state agencies don’t care that you were busy launching a product. Set calendar reminders or use software with automatic deposits. Penalties start accruing immediately after deadlines pass.
Misclassifying workers. Paying someone as a 1099 contractor when they should be a W-2 employee triggers back taxes, penalties, and potential lawsuits. The IRS looks at behavioral control, financial control, and relationship type—not what you call someone in a contract.
Forgetting state unemployment insurance. Many founders remember federal taxes but neglect state unemployment registration and deposits. Every state requires this, and rates vary based on your industry and claims history.
Ignoring multi-state complexity. Remote employees create nexus in their home states. You’re responsible for registering and withholding taxes in every state where you have workers, not just your headquarters location.

Frequently Asked Questions

How long does it take to set up payroll for a new startup?

Plan for 2-4 weeks from start to first paycheck. The bottleneck is usually state registrations, which can take 1-2 weeks to process even with electronic filing. Federal EIN registration happens instantly online, and EFTPS takes about a week for PIN delivery. Once registrations clear, setting up payroll software takes a few hours. If you need to run payroll urgently, some software providers offer expedited registration services, though these come with additional fees.

Can I run payroll myself without software or an accountant?

Yes, but it’s not recommended. Manual payroll requires calculating withholdings using IRS publications, making deposits through EFTPS, filing quarterly Form 941 and annual W-2s, plus handling all state requirements. A single employee in one state might take 3-4 hours per pay period. The error risk is high, and your time likely has better uses. Even the simplest payroll software costs less than most founders’ hourly rate for the time manual processing requires.

What happens if I pay employees late or miss a tax deadline?

Late employee payments can violate state wage laws, potentially triggering penalties and employee lawsuits—many states require payment within a set number of days after the pay period ends. Late federal tax deposits incur penalties from 2% (1-5 days late) to 15% (more than 10 days after IRS notice). You may also owe interest. State penalties vary but follow similar patterns. Consistent lateness can result in increased audit scrutiny.

Should startups use a PEO instead of standard payroll software?

Professional Employer Organizations (PEOs) become valuable when you’re scaling beyond 10-15 employees and want bundled benefits, HR support, and compliance assistance. Below that threshold, PEO fees often exceed their value compared to standalone payroll software. PEOs are particularly useful if you’re hiring in multiple states and want someone else to handle registrations and compliance. For very early-stage startups, standard software provides better cost-effectiveness and more control.

How do I handle payroll for employees working in different states?

Register with each state’s tax authority and unemployment agency where you have employees. Your payroll software should handle withholding calculations automatically once you enter each employee’s work location. Some states have reciprocal agreements affecting withholding rules. For employees who move mid-year or work in multiple states, you may need to prorate withholdings. This is one area where payroll software truly earns its cost—manual multi-state calculations are extremely error-prone.

Moving Forward With Confidence

Running payroll for the first time requires upfront work: registrations, documentation, and system setup. But once your foundation is solid, ongoing payroll becomes routine. The key is choosing systems that scale with you—what works for three employees should still work at thirty.

Start by completing all federal and state registrations, then select payroll software that matches your complexity level. For most early-stage startups, tools like Gusto or Rippling provide the right combination of simplicity and capability.

Ready to evaluate your options? Explore our complete guide to HR and payroll tools to find the right solution for your team’s needs.