United States · Reviewed 2026-08-20
U.S. payroll and Social Security taxes
FICA payroll taxes fund Social Security and Medicare frameworks. Employers generally withhold income tax and FICA from wages; self-employed people often pay self-employment tax instead.
Employee withholding basics
Paystubs commonly show federal income-tax withholding, Social Security, and Medicare deductions. Employers also pay a matching share of many FICA taxes. Wage bases and additional Medicare thresholds change over time - verify current SSA/IRS figures before estimating.
Self-employment tax
Independent contractors and many sole proprietors calculate self-employment tax on net earnings rather than seeing classic FICA lines on a W-2. Quarterly estimates often cover both income tax and self-employment tax.
How this differs from investment tax
Capital gains and dividends in a taxable brokerage account are generally not FICA wages. Employment classification still matters if you receive equity compensation, RSUs, or similar awards - those can blend payroll and capital-gains concepts.
Common mistakes
- Treating a 1099-NEC contractor like a W-2 employee for payroll planning.
- Ignoring additional Medicare tax thresholds when household wages are high.
Sources & further reading
Social & payroll FAQ
Short answers for discovery.
What is u.s. payroll and social security taxes?
FICA payroll taxes fund Social Security and Medicare frameworks. Employers generally withhold income tax and FICA from wages; self-employed people often pay self-employment tax instead.
What is a common mistake on United States u.s. payroll and social security taxes?
Treating a 1099-NEC contractor like a W-2 employee for payroll planning.
What is a common mistake on United States u.s. payroll and social security taxes?
Ignoring additional Medicare tax thresholds when household wages are high.
Investor tax guides
Featured explainers that pair with the United States desk and this topic - then open All guides for the full library.
- Tax Loss Harvesting Explained for Stock InvestorsTax loss harvesting means selling investments at a loss in a taxable account to offset capital gains (and sometimes a slice of ordinary income), then staying invested without triggering wash-sale or anti-avoidance rules. It helps most when you already have gains to offset - not as a reason to wreck a long-term plan.
- Capital Gains Tax on Stocks: Investor OverviewCapital gains tax (CGT) generally applies when you sell shares or ETFs for more than your cost basis. Rates, allowances, and holding-period rules vary by country - start here for the shared math, then open a StockWatch country CGT desk or country guide before you file.
- Crypto Tax Basics for InvestorsMost tax systems treat crypto like property for investors: selling, swapping, or spending can realize a gain or loss, and staking or airdrop rewards may look like income. Rules differ sharply by country - use this guide to frame the events, then open a capital-gains desk for your residency.
- Tax-Advantaged Accounts for Investors (IRA, 401k, ISA & More)Tax-advantaged accounts change when and how investment income is taxed: deferral inside pensions, tax-free growth in some wrappers, or employer plans with contribution limits. Names differ (401(k), IRA, ISA, TFSA, SIPP) - the design pattern is similar, and taxable brokerages still matter for overflow capital.
- Tax Loss Harvesting in the United StatesIn the U.S., tax loss harvesting usually means selling losers in a taxable account to offset capital gains - and sometimes up to $3,000 of ordinary income - while watching the wash-sale rule. This guide frames the pattern; confirm current IRS rules and your broker reports before filing.
- Capital Gains Tax on Stocks in the United StatesIn a U.S. taxable account, selling shares above your basis typically creates a capital gain taxed as short-term or long-term depending on holding period. Rates, netting, and forms change - use this as a map, then open the U.S. desk and IRS materials for the year you file.
- Wash-Sale Rule Explained for Stock InvestorsA wash sale generally means you sold at a loss and bought the same or a substantially identical security too close to that sale - so the loss may be disallowed or deferred. The textbook story is U.S.-centric; other markets use different rules. Use this guide before year-end harvesting.
- Roth vs Traditional IRA Basics for InvestorsTraditional IRA contributions may be deductible now with taxable withdrawals later; Roth contributions are after-tax with qualified withdrawals potentially tax-free. Eligibility, limits, and conversions are year-specific. Use this vocabulary guide, then the U.S. accounts desk.