Payroll tax is the money withheld from paychecks and paid by employers to fund Social Security, Medicare, and federal income tax. Understanding how these taxes work—and what you can control—matters whether you're an employee, self-employed, or a business owner. The amounts withheld depend on your filing status, income level, and the W-4 form you submit to your employer.

These articles address practical questions: whether your withholding is on track so you don't owe a surprise bill at tax time, how to adjust your W-4 if you're getting a large refund or facing a shortfall, what self-employment tax means and how it differs from employee withholding, and how life changes like a second job or spouse's income affect what you owe.