Paystub Deductions Explained
Understand every deduction on your paycheck. Learn what's mandatory, what's voluntary, and how to potentially reduce your withholdings.
Mandatory Deductions
Required by law—cannot opt out
Voluntary Deductions
Benefits you chose—can adjust
Mandatory Deductions
These are required by federal and state law—everyone pays them
Tax withheld based on your W-4 form, filing status, and income. Goes to the IRS to fund federal government operations.
Can you reduce it? Adjust W-4 allowances, increase pre-tax deductions (401k, HSA)
Tax withheld for your state government. Nine states have no income tax: AK, FL, NV, NH, SD, TN, TX, WA, WY.
Can you reduce it? Limited—based on state law and your income
Funds Social Security retirement, disability, and survivor benefits. Applies to first $176,100 of wages in 2025.
Can you reduce it? Cannot reduce—mandatory for all employees
Funds Medicare health insurance for seniors. Additional 0.9% applies to wages over $200,000.
Can you reduce it? Cannot reduce—mandatory for all employees
Total FICA Tax (Social Security + Medicare)
7.65%
Your employer pays an additional 7.65%, for a total of 15.3% going to Social Security and Medicare.
Voluntary Deductions
These are benefits you elected—you can adjust them during open enrollment
Pre-tax retirement savings. Reduces taxable income now, taxed when withdrawn in retirement.
Benefit: Reduces federal and state taxes, builds retirement savings
Medical, dental, and vision insurance premiums for employer-sponsored plans.
Benefit: Pre-tax deduction reduces taxable income
Pre-tax savings for medical expenses if you have a high-deductible health plan.
Benefit: Triple tax advantage: pre-tax in, tax-free growth, tax-free medical withdrawals
Pre-tax money for medical or dependent care expenses. Use it or lose it by year end.
Benefit: Pre-tax deduction for predictable expenses
Premiums for employer-sponsored life insurance beyond the free coverage.
Benefit: Often cheaper than individual policies
Membership fees if you're in a labor union.
Benefit: Supports collective bargaining and union benefits
Calculate Your Take-Home Pay
Use our free paycheck calculator to see exactly how deductions affect your net pay.
Common Questions
Why are so many things deducted from my paycheck?
Federal and state laws require employers to withhold taxes (income tax, Social Security, Medicare). Additional deductions like 401k and insurance are typically voluntary benefits you elected during enrollment. All deductions should be itemized on your paystub.
What's the difference between pre-tax and post-tax deductions?
Pre-tax deductions (401k, health insurance, HSA) are taken before taxes are calculated, reducing your taxable income. Post-tax deductions (Roth 401k, some insurance) are taken after taxes, so they don't reduce your tax burden now.
How can I reduce my tax withholding?
You can reduce federal withholding by updating your W-4 form with your employer. Increasing pre-tax deductions (401k, HSA) also reduces taxable income. Be careful not to underwithhold, or you'll owe taxes at filing time.
What if I think my deductions are wrong?
Review your W-4 (federal tax), state withholding form, and benefits elections. Check that the amounts match what you enrolled in. If deductions seem incorrect, contact your HR or payroll department to review your records.
Why is my first paycheck smaller than expected?
First paychecks often catch up on deductions. If you started mid-pay-period, you'll have a partial paycheck. Also, some deductions (like annual insurance premiums) may be front-loaded in early paychecks.
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