The new hire’s first paycheck arrives. Gross pay was supposed to be one thousand seven hundred and thirty dollars for the two-week period at twenty-one dollars per hour. The actual deposit hit the employee’s account at one thousand three hundred and fourteen, and the employee is asking why. The owner pulls up the payroll report and walks through the deductions: federal income tax withholding at one hundred and seventy-eight, Social Security at one hundred and seven, Medicare at twenty-five, state income tax at fifty-eight, and a forty-eight-dollar contribution to the employee-elected retirement deduction. The math adds up. The deductions are all required or elected. But the conversation with the employee is happening because the gap between gross and net came as a surprise, and the surprise traces back to neither side fully understanding the mechanics before the first check.
That conversation is one most small business owners have at some point. Payroll is the area where the business’s compliance obligations meet the employee’s expectations, and the gap between the two is where most of the friction lives. The mechanics aren’t complicated, but they involve enough categories (federal withholding, state withholding, Social Security, Medicare, state unemployment, federal unemployment, voluntary deductions) that getting them all right consistently is a discipline rather than an event.
The gross-to-net flow
Every paycheck moves through the same sequence of calculations:
- Gross pay: hours worked times wage rate, or salary divided by pay periods, plus any bonuses or commissions
- Federal income tax withholding: based on the employee’s W-4 elections and IRS withholding tables
- Social Security: 6.2% of gross wages up to the annual Social Security wage base (adjusted annually)
- Medicare: 1.45% of all gross wages, plus an additional 0.9% on wages above a threshold for high earners
- State income tax withholding: varies by state (Florida and several other states have no state income tax)
- Other voluntary deductions: health insurance, retirement plan contributions, garnishments, charitable deductions
- Net pay: gross minus all deductions, the amount that hits the employee’s bank account
The Internal Revenue Service’s Publication 15 (Employer’s Tax Guide) is the foundational reference for the employer side of this calculation. Every step has rules, and the rules need to be applied accurately for every employee on every paycheck.
The W-4 and what it actually controls
The W-4 form is the employee’s instruction to the employer about how much federal income tax to withhold. The current form, redesigned in 2020, asks the employee to consider:
- Filing status (single, married filing jointly, head of household)
- Whether the employee or spouse holds multiple jobs
- Number of dependents claiming child tax credit and credit for other dependents
- Other income not from jobs (interest, dividends)
- Deductions other than the standard deduction
- Additional withholding the employee wants beyond the calculated amount
The W-4 doesn’t ask about exemptions in the older sense; the redesigned form uses dollar amounts directly. An employee who completes the form thoughtfully has withholding that approximates the actual tax liability for the year. An employee who completes it carelessly may have substantial under-withholding (surprise tax bill in April) or substantial over-withholding (interest-free loan to the government).
The employer’s responsibility is to apply whatever the employee submitted on the W-4, not to second-guess the choices. The IRS provides a withholding estimator that employees can use to refine their elections; the employer can point employees to the resource but doesn’t make the choices for them.
The employer-side payroll taxes
Beyond what gets withheld from the employee’s wages, the employer pays additional taxes on each paycheck:
- Social Security match: employer pays an additional 6.2% on top of what’s withheld from the employee
- Medicare match: employer pays an additional 1.45%
- FUTA (Federal Unemployment Tax Act): employer pays approximately 0.6% on the first $7,000 of each employee’s wages annually
- State unemployment tax: rate varies by state and by employer experience rating
- Other state and local taxes: varies by jurisdiction
The Department of Labor’s wage and hour division and the IRS jointly enforce the federal portions of this framework. The state portions follow state-specific rules. The total employer-side cost is roughly 7-10% on top of gross wages for most employees, depending on state unemployment rates and other factors.
A common owner mistake is budgeting compensation as if gross pay equals total cost. The actual cost includes the employer-side taxes plus any benefits, which adds meaningfully to the per-employee cost. A business hiring a $50,000 salaried employee is committing to a fully-loaded cost closer to $55,000-$60,000 once payroll taxes and basic benefits are included.
The reporting cycle
Beyond paying the right amounts, the employer reports payroll to the IRS and state agencies on a defined cycle:
- Quarterly: Form 941 (federal payroll tax return) due by the end of the month following each quarter; reports total wages, withholding, and employer-side payroll taxes
- Annually: Form 940 (federal unemployment tax return) due by January 31st; reports FUTA tax for the year
- Annually: Forms W-2 to each employee and Form W-3 (transmittal) to the Social Security Administration by January 31st; reports each employee’s annual wages and withholding
- Quarterly or monthly: state-specific filings for state income tax withholding and state unemployment tax
- Semi-weekly or monthly: federal payroll tax deposits to the IRS, with the schedule depending on the employer’s deposit history
The Social Security Administration’s employer guidance handles the W-2 reporting side. The IRS handles 941 and 940. State agencies handle state-specific filings. Each has deadlines and penalties for late filing or underpayment.
The deposit schedule
The IRS classifies employers as monthly or semi-weekly depositors based on prior-year payroll tax history. Monthly depositors must deposit by the 15th of the following month. Semi-weekly depositors deposit on a schedule tied to payday.
The Electronic Federal Tax Payment System (EFTPS) is the required deposit method for most employers. Setting up EFTPS happens at the start of operations; missing the setup or missing a deposit triggers penalties that scale with the amount and lateness.
The penalty structure is steep. Late deposits incur a 2-15% penalty depending on how late, and the trust fund recovery penalty (for amounts withheld from employees but not deposited to the IRS) can be assessed against responsible individuals personally at 100% of the unpaid amount. Payroll tax compliance isn’t an area where the consequences of failure are minor; the penalty cascade is one of the most consistently aggressive enforcement areas in IRS practice. The detail of payroll tax compliance and penalty structure is addressed in a separate guide on payroll tax compliance.
The classification question: employee versus contractor
A foundational decision before any payroll discussion is whether the worker is properly classified as an employee or as an independent contractor. The classification determines whether the worker goes through payroll at all (employees) or gets paid via accounts payable with a 1099 at year-end (contractors).
Misclassification is one of the most expensive errors in employment compliance. A worker classified as a contractor who should have been an employee triggers back payroll taxes, interest, and penalties for the employer, plus potential exposure to benefits and labor law claims. The worker classification tests and the consequences of misclassification are addressed in a separate guide on 1099 versus W-2 classification.
What the new employee actually needs to understand
The conversation at the top of this guide can resolve cleanly if the basic mechanics are explained:
- The gross pay rate is what’s on the offer letter; the deductions reduce it before the deposit
- The tax withholding is set by the employee’s W-4 elections and can be adjusted at any time
- The Social Security and Medicare deductions are mandatory and equal across employers
- Any state income tax depends on the state’s rules
- Voluntary deductions (retirement contributions, health insurance) reflect choices the employee made during onboarding
A small business that walks through this with each new hire (briefly, at orientation) reduces the surprise factor and produces fewer “why is my paycheck different than I expected” conversations later. The walk-through doesn’t need to be elaborate. The point isn’t tax instruction; it’s expectation calibration.
Software versus service: who runs the payroll
Most small businesses don’t run payroll calculations manually. The options:
- Payroll software: the business’s bookkeeping system or a dedicated payroll product handles the calculations, files the returns, and processes the deposits; the business pays a monthly fee
- Payroll service: a third-party provider handles the calculations and filings, with the business approving payroll each period
- In-house spreadsheet or calculation: technically possible, practically risky for any business with more than a couple of employees; manual calculation introduces error risk, and the consequences of payroll error are expensive
The Small Business Administration’s small business resources support the position that payroll for any meaningful number of employees should be handled by software or service rather than manually. The cost of either is far less than the cost of even one significant payroll error.
The owner’s payroll consideration
A specific situation worth distinguishing: payroll for the owner. The treatment varies by business structure:
- Sole proprietorship: owner doesn’t take payroll; instead takes owner’s draw against equity, pays self-employment tax through quarterly estimated payments
- Partnership: similar to sole proprietorship for partners
- S-corporation: owner-employees take a “reasonable salary” through payroll (subject to all the same withholding and employer taxes), can also take distributions
- C-corporation: owner-employees take salary; dividends are separate
The S-corporation reasonable salary requirement is one of the more nuanced compliance areas; the IRS expects S-corporation owner-employees to pay themselves a salary commensurate with the work performed before taking distributions. Underpaying the salary to avoid payroll taxes is an audit risk. The detail of business structure tax implications is addressed in a separate guide on business structure.
A reasonable monthly cadence
A short reference for the routine that produces clean payroll:
- Each pay period: process payroll on time, verify deposit amounts, send pay stubs
- By the 15th of each month (monthly depositors): deposit prior month’s payroll taxes via EFTPS
- Each quarter: file Form 941 by the deadline (April 30, July 31, October 31, January 31)
- Annually by January 31: distribute W-2s to employees, file W-3 with SSA, file Form 940 (FUTA)
- Annually by January 31: file state-specific annual returns
- At each new hire: collect W-4, I-9, state-specific new hire reporting
The cadence isn’t optional. The deadlines are statutory. A business that misses any of them faces penalties that scale with the amount and the delay. A business that runs the cadence consistently builds compliance as a routine that doesn’t require special attention; the discipline is what produces clean payroll without recurring fire drills.
The first paycheck revisited
The new hire whose net pay didn’t match their gross expectation got a paycheck that’s correct under all the rules. The conversation that followed is the conversation most new hires have at some point in their work history. The owner who handles it well walks through the deductions, points the employee to the IRS withholding estimator if they want to adjust, and uses the moment to confirm the W-4 elections match what the employee actually wants.
The discipline behind that conversation isn’t the math (the math is what the software did). It’s the explanation infrastructure: a payroll process that produces correct paychecks, documentation that lets the employee see the calculation, and an owner or bookkeeper who can answer the question without having to investigate the underlying numbers from scratch. A business with that infrastructure handles the gross-to-net conversation in five minutes. A business without it spends hours figuring out what happened on a single paycheck.
- IRS: Publication 15, Employer’s Tax Guide
- Department of Labor: Wage and Hour Division
- Social Security Administration: Employer W-2 Filing Instructions