Payroll: Definition, How It Works, and Examples (2026)
Also known as: Payroll processing, Wage administration, Payroll management
TL;DR
Payroll is the process of calculating and paying employee compensation, withholding and remitting taxes, and administering deductions — along with the legal, regulatory, and reporting obligations that accompany paying workers.
What payroll actually involves
Payroll is more than "cut the check." A single pay period requires calculating gross wages (hourly rates, salaries, overtime, bonuses, commissions), withholding federal income tax, FICA, state income tax, and local taxes, subtracting pre- and post-tax deductions (benefits premiums, 401(k), garnishments), depositing tax payments to IRS and state authorities, filing returns (941, 940, state equivalents), generating pay stubs, and producing year-end documents (W-2, 1099, state wage reports).
The cost of getting any of this wrong is significant. Payroll-tax penalties for late deposits run 2-15% per incident. Wage-and-hour mistakes create multi-plaintiff lawsuits. State-tax nexus errors compound silently until an audit.
The payroll stack: DIY, software, PEO, EOR
Four common approaches, each suiting different company sizes and shapes:
| Approach | Best for | Typical cost |
|---|---|---|
| Spreadsheet + accountant | 1-5 employees, single state | $200-$500/month |
| Payroll software (Gusto, Rippling, ADP RUN) | 5-200 employees, single country | $40-$200/month + per-employee fee |
| PEO (TriNet, Insperity) | 10-150 US employees wanting outsourced HR | $100-$200/employee/month |
| Global payroll platform (Deel, Remote, Papaya) | Companies with workers in multiple countries | $30-$100/employee/month |
| EOR for international | Workers in countries where you have no entity | $300-$700/month per employee |
Multi-state and multi-country complexity
Every additional state or country multiplies payroll complexity. A quick look at why:
Multi-state US
Each state where you have an employee creates: state withholding registration, state UI account, state-specific wage notices (e.g., NY WTPA), workers' comp policy, reciprocity-agreement handling, local-tax registrations (PA, OH). Most payroll software handles this, but you still need to register in each state.
International
Each country has its own wage calculations, statutory benefits (13th-month pay in Mexico and the Philippines, mandatory PTO in most of Europe), tax-withholding regime, social-security contributions, and labor-law compliance. Running international payroll via a global EOR or global payroll provider is standard for companies with workers in <20 per country.
Common payroll mistakes with real consequences
The most expensive payroll mistakes:
- • Missing federal tax deposits — 2-15% penalty per deposit, compounding
- • Misclassifying workers — back taxes, UI, WC, worker lawsuits
- • Missing state registration when hiring remote — back taxes plus penalties per state
- • Miscalculating overtime — DOL lawsuits with liquidated damages (2x)
- • Off-cycle bonuses without proper tax treatment — under-withholding penalties
- • Late or missing W-2s — $60-$310 per form IRS penalty
- • Wage garnishment non-compliance — employer personally liable for the full garnishment
Running international payroll — the three hard problems
Companies that hire across borders run into three recurring challenges:
- • Currency and FX: paying in local currency requires currency conversion with spread; paying in USD may require employee conversion with their own spread. Either way, there's slippage.
- • Statutory benefits: Philippines (13th month + SSS + PhilHealth), India (PF + gratuity), Mexico (Aguinaldo + IMSS). These are legally mandatory and non-trivial.
- • Timing: many countries have monthly pay cycles, not biweekly. Moving from US biweekly to foreign monthly requires adjusting your payroll calendar.
Frequently asked questions
What does "fully loaded" payroll cost mean?
The total cost of employing someone, not just their salary — base pay + employer payroll taxes (FICA 7.65%, FUTA, SUTA) + benefits + workers' comp + any other employer contributions. In the US, fully loaded cost is typically 25-35% above base salary.
How do I run payroll for offshore workers?
Three options: (1) use an EOR that handles local payroll in the worker's country; (2) work through an offshore staffing agency that employs the worker and bills you a service invoice; (3) set up your own foreign entity (worthwhile only above 20+ headcount in that country).
Is payroll software enough for a small business?
For US-only, single-state, all-W-2 companies up to about 50 employees, yes. Add multi-state, 1099s, benefits administration, or international workers, and you usually need a PEO, EOR, or global payroll provider.
What is shadow payroll?
A reporting mechanism used when an employee is paid from one country but working in another, and both countries have a tax claim. Shadow payroll reports the worker's wages to the host country for tax purposes without physically paying them there. Common in international assignments.
How often should I run payroll?
US: weekly, biweekly, semi-monthly, or monthly. Biweekly is most common (26 pay periods/year). Some states (CA, NY) mandate minimum frequencies. For most international employees, monthly is the expectation.
What is 13th-month pay?
A legally required bonus equal to one month's salary, paid annually, in the Philippines, Mexico (Aguinaldo), and several other countries. It is not a bonus in the US sense — it is mandatory compensation. When hiring in these countries, budget 1/12 extra on top of monthly salary.