Payroll: definition, types, how does it work, frequencies, components, and calculations

Payroll is the process of calculating employee compensation, withholding taxes and deductions, and distributing wages on a recurring schedule while maintaining compliance with federal, state, and local employment tax laws. For most businesses, payroll is the single largest operating expense. It includes not just the wages employees take home, but also the employer’s share of employment taxes (FICA, FUTA, SUTA), workers’ compensation insurance, and benefits contributions that add 20% to 35%+ on top of gross wages.

Getting payroll wrong has immediate consequences. Late or incorrect tax deposits trigger IRS penalties ranging from 2% to 15% of the unpaid amount. Misclassifying employees as independent contractors exposes the business to back taxes and interest, with IRC Section 3509 providing reduced-rate relief on the employee’s share only (1.5% of wages for income tax plus 20% of employee FICA if 1099s were filed; the employer still owes 100% of the employer’s FICA match and FUTA). Section 3509 applies only when the misclassification was not willful and Section 530 of the Revenue Act of 1978 doesn’t apply. If Section 530’s safe harbor applies, no reclassification liability exists at all. Per an EY December 2022 analysis, payroll errors cost approximately $291 per correction on average. The DOL’s Wage and Hour Division recovered $273 million in back wages in FY 2024.

Payroll types are defined by how compensation is calculated, not by the payment method.

Payroll operates as a repeating cycle with five stages. Before running your first payroll, you need an Employer Identification Number (EIN) from the IRS, an EFTPS account for federal tax deposits, state unemployment insurance registration, and state income tax withholding accounts in each state where you have employees.

Gather hours worked (from timesheets, time clocks, or time-tracking software), salary changes, new hire onboarding data (W-4, I-9, state withholding forms, direct deposit authorization), benefit election changes, and any one-time adjustments (bonuses, commissions, reimbursements, retroactive pay corrections). For independent contractors, collect Form W-9 instead of W-4. Each employee has different compensation amounts, withholding elections, and benefit profiles, so accurate data collection is the foundation for every downstream calculation.

For hourly employees, multiply hours worked by the hourly rate. Add overtime at 1.5x the regular rate for hours exceeding 40 per workweek under FLSA (California also requires daily overtime at 1.5x over 8 hours and 2x over 12 hours per day). For salaried employees, divide the annual salary by the number of pay periods. For example, an employee earning $78,000 paid biweekly receives $3,000 gross per pay period ($78,000 / 26 = $3,000). Add any supplemental pay, including bonuses, commissions, tips, and shift differentials.

The FLSA’s "regular rate" calculation requires employers to include non-discretionary bonuses, commissions, and shift differentials in the rate used for overtime under Section 7(e). This is a frequent compliance failure point that DOL WHD enforcement routinely flags. Excluding a quarterly production bonus from the overtime rate, for example, results in systematic overtime underpayment across every affected pay period.

Subtract pre-tax deductions first (401(k) contributions, Section 125 cafeteria plan premiums, HSA contributions, FSA contributions). Pre-tax deductions reduce the employee’s taxable income for federal income tax purposes, though not all pre-tax deductions reduce wages for FICA (check plan rules). Then calculate and withhold federal income tax (based on the employee’s W-4 elections and IRS Publication 15-T tables), Social Security tax (6.2% on wages up to $184,500 in 2026), Medicare tax (1.45% on all wages, plus 0.9% Additional Medicare Tax on wages above $200,000, which is employee-paid only and not matched by the employer), and applicable state and local income taxes.

After tax withholdings, subtract any post-tax deductions including Roth 401(k) contributions, garnishments, child support withholding orders, union dues, charitable contributions, and federal tax levies. Court-ordered garnishments like child support are mandatory and take priority over voluntary deductions.

Pay employees via direct deposit (ACH transfer, typically originated 1 to 2 business days before payday, with same-day ACH available as a premium option), printed check, payroll card, or mobile wallet. Direct deposit is faster, more secure, and eliminates the risk of lost or stolen checks. Issue pay stubs showing gross pay, each deduction line item, employer contributions, and net pay. Pay stub requirements vary by state. California requires 9 specific items under Labor Code § 226. Some states don’t mandate pay stubs at all. Others require specific itemization of hours worked, pay rates, deductions, and year-to-date totals.

Deposit withheld employee taxes and the employer’s matching share with the IRS via EFTPS. Employers with $50,000 or less in total employment taxes during the lookback period (12 months ending the preceding June 30) are monthly depositors and must deposit by the 15th of the following month. Above $50,000, the employer is a semi-weekly depositor. Taxes on wages paid Wednesday through Friday must be deposited by the following Wednesday. Taxes on wages paid Saturday through Tuesday must be deposited by the following Friday. FUTA taxes are deposited when accumulated liability exceeds $500 at the end of any quarter; amounts under $500 carry forward to the next quarter and are paid with the annual Form 940 if the cumulative total never crosses $500.

File Form 941 quarterly. File W-2s and W-3 annually by January 31 (employers with 10 or more information returns must file electronically per T.D. 9972, aggregated across W-2s, 1099s, and other form types). File Form 940 (FUTA) annually. Update your general ledger after each pay run to keep financial reports, budgeting, and tax preparation accurate.

Payroll has two sides. The employee side (what gets withheld from their paycheck) and the employer side (what the business pays on top of wages).

The total employer cost on top of wages typically ranges from 20% to 35%+ for fully-benefited US employees, and can exceed 40% with generous health, retirement, and paid leave benefits. For a $60,000/year employee, employment taxes alone (FICA match, FUTA, SUTA, workers’ comp) total approximately $5,000 to $7,000. Adding the employer share of health insurance (averaging $7,500 to $8,500/year for single coverage per 2024 KFF data, or $19,000+ for family coverage) pushes total employer costs to $12,500 to $27,000+ above the salary.

Employers reaching 50 full-time equivalent (FTE) employees trigger Applicable Large Employer (ALE) status under the ACA, requiring Form 1095-C (and transmittal Form 1094-C) reporting. The 2026 Section 4980H penalties per IRS Rev. Proc. 2025-26 are $3,340/year per full-time employee (minus 30) if minimum essential coverage isn’t offered to at least 95% of full-time employees, or $5,010/year per employee receiving a premium tax credit if coverage is unaffordable or doesn’t meet minimum value.

Payroll deductions are amounts subtracted from an employee’s gross pay before determining their net (take-home) pay. They fall into two categories. Mandatory deductions required by law and voluntary deductions authorized by the employee.

Mandatory deductions include federal income tax (based on W-4 elections), Social Security tax (6.2% on wages up to $184,500), Medicare tax (1.45% on all wages, plus 0.9% Additional Medicare Tax on wages over $200,000), state and local income taxes where applicable, and court-ordered garnishments such as child support and federal tax levies. These cannot be waived or declined by the employee.

Pre-tax voluntary deductions are subtracted before taxes are calculated, reducing the employee’s taxable income. They include traditional 401(k) and 403(b) retirement contributions, Section 125 cafeteria plan health insurance premiums, dental and vision insurance, FSA contributions, and HSA contributions. Not all pre-tax deductions reduce wages for every tax type. Health insurance premiums typically reduce wages for both federal income tax and FICA, while 401(k) contributions reduce wages for federal income tax but not for FICA.

Post-tax deductions are subtracted after all taxes have been withheld. They include Roth 401(k) and Roth IRA contributions, certain life insurance premiums, union dues, charitable contributions, and wage garnishments. Post-tax deductions don’t reduce the employee’s tax liability.

The four standard US payroll frequencies are biweekly (26 pay periods/year, used by 43.0% of US employers per BLS February 2023 data), weekly (52 pay periods, 27.0%), semi-monthly (24 pay periods, 19.8%), and monthly (12 pay periods, 10.3%). More frequent pay periods increase employee satisfaction by providing quicker access to earned wages but also increase payroll processing costs and administrative workload.

State requirements vary. California Labor Code § 204 requires semi-monthly pay with specific date windows (wages earned 1st-15th paid by the 26th; wages earned 16th-end paid by the 10th of the following month). New York Labor Law § 191 requires weekly pay for manual workers, with recent litigation (Vega v. CM & Associates Construction Management, LLC in the First Department, 2019, and Grant v. Global Aircraft Dispatch in the Second Department, 2024, creating a department split), generating significant class action exposure for employers paying manual workers biweekly instead of weekly. Pay frequency also affects how employers calculate overtime under the FLSA. Overtime is based on hours worked within a defined workweek, regardless of the pay period schedule.

Earned wage access (on-demand pay) is now integrated into major payroll platforms (Gusto, ADP, Rippling, Paychex) and also offered through third-party providers (DailyPay, PayActiv, Earnin). The CFPB issued a proposed interpretive rule in 2024 that would treat most EWA products as credit subject to TILA, but the final status of that rule remains uncertain following the change in administration in 2025. Several states (California, Nevada) have enacted their own EWA regulatory frameworks. Verify the regulatory treatment in your state before offering earned wage access.

Payroll functions span ten operational areas. Calculating gross-to-net pay. Withholding federal, state, and local taxes. Tracking employee time and attendance. Processing payments via direct deposit or check. Filing quarterly (941) and annual (W-2, 940) tax returns. Maintaining payroll records for at least 4 years (IRS per 26 CFR § 31.6001-1) or 3 years for payroll records and 2 years for time cards (FLSA per 29 CFR § 516.5-516.6). Retaining I-9 forms for 3 years after the date of hire or 1 year after termination, whichever is later. Generating payroll-related reports for financial planning, audit readiness, and compliance. Structuring compensation packages. Distributing pay stubs. Managing payroll for non-standard workers, including gig and freelance workers, who may require 1099 reporting rather than W-2 treatment.

State payroll requirements add layers of complexity that no single federal rule covers.

A single remote hire in a new state triggers registration, withholding, SUTA, and labor law compliance in that state, especially since remote work expanded the geographic footprint of many employers.

Multi-state payroll is the number-one complexity driver. Each new state adds registration, withholding, SUTA, labor law compliance, and potentially different pay frequency requirements. For international teams, the complexity multiplies further. See the challenges of global payroll for cross-border considerations.

Penalties are 2% if 1 to 5 days late, 5% if 6 to 15 days late, 10% if 16+ days late, and 15% if not deposited within 10 days of an IRS notice. The Trust Fund Recovery Penalty under IRC Section 6672 assesses 100% of unpaid trust fund taxes (withheld income tax + employee FICA) against any responsible person personally.

The IRS applies a common-law test examining behavioral control, financial control, and the type of relationship. The DOL uses a separate economic reality test under the FLSA (updated by the 2024 Final Rule effective March 11, 2024; the rule has faced legal challenges and its status continues to evolve). A worker can be correctly classified under one test but misclassified under the other. IRC Section 3509 provides reduced-rate federal relief on the employee’s share for non-willful misclassification (the employer still owes full employer FICA and FUTA), but state-level penalties (California Labor Code § 226.8 imposes $5,000 to $15,000 per violation for willful misclassification, or $10,000 to $25,000 per violation if there’s a pattern or practice) apply independently.

Per an EY December 2022 analysis, the average cost to correct a single payroll error is approximately $291. Errors include miscalculated overtime (especially failing to include non-discretionary bonuses in the FLSA regular rate), incorrect tax withholding due to outdated W-4s, missed state registrations for remote employees, and applying the wrong SUTA rate after an experience rating change. Implementing quarterly internal audits catches errors before they compound across multiple pay periods.

W-2 employees work under the employer’s direction and control. The employer withholds federal income tax, Social Security, and Medicare from the employee’s paycheck, matches FICA contributions (bringing the total FICA to 15.3% split equally), pays FUTA and SUTA, and typically provides benefits including health insurance, retirement contributions, and paid time off. At year-end, the employer issues Form W-2 documenting total compensation and tax withholdings.

1099 contractors are self-employed individuals who control how they complete their work, often work for multiple clients simultaneously, provide their own tools, and handle their own business expenses. Businesses do not withhold taxes from contractor payments. Contractors pay self-employment tax covering both the employee and employer portions of FICA (15.3% total). Businesses issue Form 1099-NEC for payments of $600 or more during the tax year.

The IRS evaluates classification based on behavioral control (who directs how work is done), financial control (who controls business aspects of the job), and the type of relationship (contracts, benefits, permanency). Misclassifying employees as contractors violates federal and state laws and triggers back wages, overtime, employment taxes, penalties, and interest. Businesses uncertain about classification can file Form SS-8 with the IRS for a determination.

Three approaches exist, each with different trade-offs in cost, control, and compliance risk.

Full-service outsourced payroll services (Gusto, ADP, Paychex) handle processing, tax filing, and compliance for a monthly fee. The cost of payroll software ($30 to $150/month) is typically offset by the reduction in correction costs ($291 per error per EY data) and penalty avoidance. Manual processing becomes impractical above 5 to 10 employees because the compliance burden grows faster than headcount. For guidance on evaluating providers, see Selecting a payroll provider.

Six strategies reduce payroll errors, improve compliance, and save administrative time.

Consolidate different payment schedules (hourly weekly, salaried semi-monthly) into a single pay frequency that complies with state laws. Running multiple pay schedules unnecessarily complicates processing and increases error risk.

Connect payroll software with time clocks, accounting ledgers, and HR systems so data flows automatically between systems. This eliminates manual hour entry, the primary source of gross pay calculation errors. However, integration doesn’t address classification decisions like whether non-discretionary bonuses are included in the FLSA regular rate. That requires human review.

Paper checks cost money to print and mail, can be lost or stolen, and create delays. Direct deposit ensures employees’ pay is available on payday with no manual distribution.

Map every federal, state, and local deadline for the year, including quarterly 941 filings, annual W-2/1099 distribution (January 31), 940 filing, state SUTA returns, PFML contribution deadlines, and new hire reporting. Assign ownership for each deadline.

Conduct spot-checks of tax deposits, employee classifications, overtime calculations, and I-9 retention before small errors compound. Trigger additional audits after expanding into a new state, completing an acquisition, reclassifying workers, or migrating payroll systems.

Incorrectly classifying employees as independent contractors triggers penalties at both the federal and state levels. The IRS and DOL use different classification tests, and state tests (like California’s ABC test, codified at Labor Code § 2775) add further variation. Review classifications whenever a worker’s role, schedule, or working arrangement changes.

Federal record keeping requirements come from both the IRS and the FLSA.

Under 29 CFR § 516.7(a), records kept at a central recordkeeping office (separate from the place of employment) must be made available within 72 hours upon DOL request. Records kept on-site at the worksite must simply be safe and accessible. Keep records organized regardless of location, as they provide the data needed to complete Form W-2 each year and to defend against wage-and-hour claims.

Gross pay is total earnings before deductions. Net pay is what the employee receives after all withholdings. The difference typically ranges from 25% to 40% of gross pay, depending on tax bracket, state, and benefit elections. Gross pay is used for loan applications and financial planning. Net pay is what employees use for budgeting.

W-4 (employee withholding elections), I-9 (employment eligibility verification), 941 (quarterly employer tax return), W-2 (annual wage and tax statement, electronic filing required for 10+ forms per T.D. 9972, aggregated across form types), W-3 (transmittal to SSA), 940 (annual FUTA return), and W-9/1099-NEC for independent contractors.

The IRS imposes graduated penalties. 2% if 1 to 5 days late, 5% if 6 to 15 days late, 10% if 16+ days late, and 15% if not deposited within 10 days of an IRS notice. For trust fund taxes, the Trust Fund Recovery Penalty under IRC Section 6672 assesses 100% of the unpaid trust fund portion against any responsible person personally.

Beyond wages, plan for 20% to 35%+ in employer taxes and contributions (FICA match, FUTA, SUTA, workers’ comp, benefits). The cost of running payroll itself depends on your method. Manual payroll is lowest direct cost but highest time and error risk. Payroll software runs $30 to $150/month base plus $5 to $20 per employee. Full-service outsourcing costs more but eliminates compliance burden entirely.

Payroll taxes (FICA) fund Social Security and Medicare at fixed rates (6.2% + 1.45%) with the employer matching both. The 0.9% Additional Medicare Tax on wages over $200,000 is employee-only and not matched by the employer. Income taxes fund general government operations at variable rates based on earnings, filing status, and W-4 elections. Employers do not match income tax withholdings. Together, base FICA totals 15.3% per employee (7.65% each from employer and employee), with the additional 0.9% Medicare applying only to high earners and only on the employee side.

For each employee, collect Form W-4 (withholding elections), Form I-9 (employment eligibility), state tax withholding forms (where applicable), direct deposit authorization, and benefit enrollment forms. For independent contractors, collect Form W-9. You’ll also need an Employer Identification Number (EIN) from the IRS and an EFTPS account for federal tax deposits. Register for state unemployment insurance and state income tax withholding accounts in each state where you have employees.