The moment a business has its first W-2 employee, "payroll" stops meaning "write a check" and starts meaning a set of federal tax obligations that run on their own calendar, separate from the business's income tax return.
What is actually in "payroll tax"
- Federal income tax withholding, money withheld from an employee's pay based on their Form W-4, and sent to the IRS on the employer's behalf.
- Social Security and Medicare tax (FICA), split between employer and employee, each paying a share.
- Federal unemployment tax (FUTA), paid by the employer only, not withheld from the employee.
Deposits happen more often than filings
Payroll tax is not paid once a quarter and forgotten. Deposits of withheld income tax and FICA are due on a schedule set by the size of your payroll, monthly for smaller employers and within days of each payroll for larger ones. The quarterly Form 941 that reports the total is a reconciliation, not the payment itself.
1099 contractors are different
None of the above applies to a genuine independent contractor. No withholding, no employer share of FICA, no FUTA. Instead, a business tracks what it paid each contractor over the year for 1099-NEC reporting. Misclassifying an employee as a contractor to avoid payroll tax is a separate problem, and one the IRS specifically looks for.