A payroll service calculates and pays employees for small businesses: wages, withholding, direct deposits, payroll tax deposits and filings, year-end W-2s and compliance with state rules. Payroll errors cause penalties and unhappy employees, so many owners gladly pay a trusted provider.
Payroll carries serious responsibility: you handle money held in trust for tax agencies and employees’ personal data. The IRS warns employers that they remain responsible for payroll taxes even when they outsource, so clients look for providers with strong controls. Many independent providers use professional payroll software and position themselves as personal, local alternatives to large national firms. This guide covers services, tax duties, authorizations, money handling, security, pricing, a worked example and a 90-day plan.
A payroll service at a glance
Table of Contents
| Topic | What to expect |
|---|---|
| Startup cost | Low to moderate: payroll software, a secure portal, insurance (including crime or fidelity coverage), training and marketing |
| Key authorizations | IRS Form 8655 lets you act as a reporting agent for clients’ payroll tax filings and deposits |
| Key risks | Missed deposits and filings, money handling errors and data security; employers stay liable for unpaid payroll taxes |
| How you charge | Per payroll run plus per employee, with fees for year-end forms, new state registrations and extras |
| Best for | Precise, deadline-driven people with payroll or accounting experience |
Who a payroll service suits
It suits people with payroll or accounting experience who are precise, organized and calm under deadlines. Payroll runs on fixed schedules, and mistakes affect people’s paychecks.
Services to offer
- Payroll calculations: wages, overtime, withholding and deductions.
- Direct deposit and pay stubs.
- Federal, state and local payroll tax deposits and quarterly filings.
- Year-end W-2s and contractor 1099s.
- New hire reporting and state registrations.
- Garnishments, benefits deductions and retirement contributions.
- Time tracking integration and reports.
Payroll tax duties
Employers withhold federal income tax, Social Security and Medicare from wages, pay the employer’s share, deposit taxes on IRS schedules and file returns such as Form 941 quarterly and Form 940 annually for federal unemployment tax, plus state withholding and unemployment filings. Deposit schedules depend on the employer’s tax liability. A payroll provider’s core job is getting every deposit and filing right and on time.
Reporting agent authorization
Form 8655 (Reporting Agent Authorization) allows a provider to sign and file certain payroll tax returns and make deposits for clients electronically, and to receive copies of notices. Set it up for each client where you file on their behalf, and follow IRS reporting agent requirements.
Employers stay responsible
The IRS warns that employers remain responsible for payroll taxes even when they use a payroll provider, and it recommends employers verify deposits. Unpaid withheld taxes can lead to the trust fund recovery penalty against responsible individuals. Build trust with transparent reporting: give clients deposit confirmations and encourage them to check their IRS accounts.
Handling money safely
Decide whether clients’ funds will be debited directly to pay employees and taxes (often through your software provider’s system) or held in trust accounts you manage. Either way, follow ACH and direct deposit rules (set by Nacha for the ACH network), reconcile every payroll and never mix client funds with your own. Carry crime or fidelity insurance in addition to errors and omissions coverage.
Data security
Financial records are sensitive and attractive to criminals. Use encrypted storage and secure client portals instead of email attachments, enforce multi-factor authentication, limit access and train anyone who works with you. Financial service providers may be covered by the FTC’s Safeguards Rule, including a written information security plan, and the IRS publishes guidance for tax professionals in Publication 4557.
Startup costs to plan for
| Item | What to budget for |
|---|---|
| Payroll software | Professional platform with tax filing and direct deposit |
| Secure portal | Encrypted document exchange |
| Insurance | Errors and omissions, crime or fidelity coverage |
| Training | Payroll certification and state rules |
| Contracts | Service agreements defining responsibilities |
| Marketing | Accountant partnerships and local networking |
Use our startup cost calculator for your total.
Pricing
Many providers charge a base fee per payroll run plus a per-employee fee, with separate charges for year-end forms, new state registrations, off-cycle payrolls and extras such as garnishments. Make sure prices cover software costs that also scale per employee. Use our pricing calculator.
A worked example: a small provider
These are illustrative assumptions for a small independent provider, not predictions.
| Assumption | Monthly | |
|---|---|---|
| Payroll processing | 40 clients averaging 12 employees, at $45 per run plus $5 per employee per run, about 2.2 runs a month | $9,240 |
| Year-end and add-on fees | Averaged monthly | $900 |
| Revenue | $10,140 | |
| Payroll software | Per client and per employee costs | $(1,600) |
| Payroll specialist | Part-time, with payroll costs | $(2,400) |
| Insurance | Errors and omissions, crime or fidelity coverage | $(300) |
| Secure portal and IT | $(200) | |
| Marketing and accounting | $(500) | |
| Profit before owner pay and taxes | $5,140 |
That leaves about $5,140 a month before the owner’s pay and taxes, on about $10,140 of revenue. Payroll clients rarely switch providers when service is good, making the revenue very steady.
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A payroll run checklist
- Collect hours and changes by the cutoff time.
- Review new hires, terminations, raises and deductions.
- Run payroll and review the preview for errors.
- Get client approval and confirm funding.
- Process direct deposits and tax payments.
- Reconcile and send reports and confirmations.
Finding clients
- Accountants and bookkeepers, the most common referral source.
- New businesses hiring their first employees.
- Businesses unhappy with large providers’ service.
- Industry niches with special payroll needs, such as restaurants with tips or construction with prevailing wage.
- Business associations and chambers of commerce.
Agreements with clients
Your service agreement should state who is responsible for what: the client provides accurate hours and funds on time; you process payroll and filings as agreed. Include cutoff times, funding deadlines, error correction procedures, fees and termination terms.
Multi-state payroll
Employees working in different states, including remote workers, create multiple state withholding, unemployment and local tax obligations. Register clients correctly in each state, track work locations and keep current with state rules; multi-state expertise is a strong selling point.
Correcting payroll errors
Mistakes happen: wrong hours, missed deductions or incorrect rates. Have a clear correction process (off-cycle payrolls, adjustments in the next run and amended filings when needed), document every correction and tell clients promptly.
Worker classification
Misclassifying employees as independent contractors creates tax and legal problems. Payroll providers are not responsible for clients’ classification decisions, but you can flag concerns and suggest clients get advice from an HR consultant or employment attorney.
Benefits and retirement deductions
Health insurance premiums, retirement plan contributions and other benefits must be deducted correctly, sometimes pre-tax, and sent to providers on schedule. Coordinate with benefits brokers and retirement plan providers so deductions and contributions match.
Year-end processing
Year-end brings W-2s and 1099s, reconciliations of quarterly filings, annual unemployment returns and client questions. Start in the fall by confirming employee addresses and details, reconciling year-to-date totals and reminding clients of deadlines, then charge year-end fees for the extra work.
Common mistakes to avoid
- Missing deposit deadlines.
- Mixing client funds with your own.
- No reporting agent authorizations where you file for clients.
- Weak data security.
- Pricing that ignores per-employee software costs.
Your first 90 days
- Days 1-30: choose payroll software, complete training and write your service agreement.
- Days 31-60: buy insurance, set prices and build relationships with accountants and bookkeepers.
- Days 61-90: onboard first clients carefully, ideally at the start of a quarter.
Frequently asked questions
Do I need a license to start a payroll service?
Generally no federal license, but you should follow IRS reporting agent rules and check your state’s requirements.
What is Form 8655?
The IRS Reporting Agent Authorization, allowing a provider to file certain payroll tax returns and make deposits for clients.
Who is responsible if payroll taxes are not paid?
The employer remains responsible, and responsible individuals can face the trust fund recovery penalty.
How do payroll services charge?
Usually a base fee per payroll run plus a per-employee fee, with extra charges for year-end forms and add-ons.
What insurance does a payroll provider need?
Errors and omissions plus crime or fidelity coverage, since you handle funds and data.
When is the best time to start new payroll clients?
At the start of a quarter or year, which simplifies quarterly filings and year-end forms.
Can I run payroll for clients in other states?
Yes, with software that supports each state’s taxes and careful registration and filings in every state where employees work.
Do payroll providers handle tips?
Many do, reporting tips and handling tip credits correctly for restaurants, following federal and state rules.
What happens if a client cannot fund payroll?
Your agreement should require funds before processing; never advance your own money to cover a client’s payroll.
Should payroll providers be certified?
Payroll certifications from professional associations build knowledge and credibility, though they are not legally required.
How many clients can a small payroll service handle?
It depends on payroll frequency and complexity; good software and checklists let small teams serve many clients.
Keep learning
- Accounting and bookkeeping industry data
- How to start a bookkeeping business
- How to start an HR consulting business
- Pricing calculator
Sources
- IRS, Reporting agents and Form 8655
- IRS, Employment tax due dates and deposits
- IRS, Trust fund recovery penalty
- IRS, Outsourcing payroll duties
- Nacha, ACH rules and direct deposit
- FTC, FTC Safeguards Rule: what your business needs to know
- US Bureau of Labor Statistics, Bookkeeping, accounting and auditing clerks
Last reviewed November 3, 2026. Startup costs are estimates; check local prices, licensing and tax rules before you commit money.
