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Understanding Your Paycheck Deductions

Your gross salary and your take-home pay are two very different numbers. Before your paycheck reaches your bank account, several mandatory and voluntary deductions are subtracted. Understanding each deduction helps you plan your budget and make smarter decisions about retirement contributions and tax withholding.

What Is FICA?

FICA stands for the Federal Insurance Contributions Act. It funds Social Security and Medicare. As an employee, you pay 6.2% of your wages toward Social Security (up to $176,100 in 2025) and 1.45% toward Medicare. If your wages exceed $200,000 (single) or $250,000 (married filing jointly), an additional 0.9% Medicare surtax applies. Your employer matches your contribution, paying the same 7.65% on your behalf.

Pre-Tax vs. Post-Tax Deductions

Pre-tax deductions like traditional 401(k) contributions and HSA contributions are subtracted from your income before federal income tax is calculated. This lowers your taxable income and reduces the amount of tax you owe each paycheck. Post-tax deductions, such as Roth 401(k) contributions, come out after taxes are calculated and do not reduce your current taxable income but provide tax-free growth for retirement.

Adjusting Your W-4

If you consistently receive a large refund or owe money at tax time, your W-4 withholding may need adjustment. You can submit a new W-4 to your employer at any time. Consider updating it after major life events like marriage, having a child, buying a home, or starting a side job. The goal is to have your withholding closely match your actual tax liability so you neither overpay throughout the year nor face a surprise bill in April.