Understanding Your Paycheck: Taxes & Deductions

Most people glance at their paycheck, look at the net deposit, and move on. But between your gross salary and your take-home pay lies a web of taxes, deductions, and contributions that can claim 25-40% of every dollar you earn. Understanding exactly where that money goes puts you in control of your finances and helps you make smarter decisions about retirement contributions, benefits elections, and tax planning.

1. Gross Pay vs. Net Pay

Your gross pay is the total amount you earn before any deductions. If your annual salary is $75,000, your gross pay per biweekly paycheck is $75,000 / 26 = $2,884.62. Use our salary calculator to quickly convert between annual, monthly, biweekly, weekly, and hourly rates.

Your net pay (also called take-home pay) is what actually hits your bank account after all taxes and deductions. For most workers, net pay is 60-75% of gross pay. Use our paycheck calculator to estimate your exact take-home amount.

2. Federal Income Tax

Federal income tax uses a progressive marginal system, meaning different portions of your income are taxed at different rates. You do not pay your top bracket rate on all your income -- only on the portion that falls within that bracket.

2026 Federal Tax Brackets (Single Filer)

Tax Rate	Income Range	Tax on This Portion
10%	$0 - $11,925	$1,192.50
12%	$11,926 - $48,475	$4,385.88
22%	$48,476 - $103,350	Up to $12,072.50
24%	$103,351 - $197,300	Up to $22,548.00
32%	$197,301 - $250,525	Up to $17,031.68
35%	$250,526 - $626,350	Up to $131,538.75
37%	Over $626,350	On remaining

Use our income tax calculator to see your exact federal tax liability.

Example: On a $75,000 salary (single, standard deduction of $15,700), your taxable income is $59,300. Your federal tax would be approximately:
10% on first $11,925 = $1,192.50
12% on next $36,550 = $4,386.00
22% on remaining $10,825 = $2,381.50
Total federal tax: ~$7,960 (effective rate of 10.6%)

3. FICA: Social Security & Medicare

FICA taxes are separate from income tax and fund two specific programs:

• Social Security: 6.2% of gross pay up to the wage base limit ($176,100 in 2026). Your employer pays a matching 6.2%.
• Medicare: 1.45% of all gross pay with no cap. An additional 0.9% applies to earnings over $200,000 (single filers).

Example: On the $75,000 salary:
Social Security: $75,000 x 6.2% = $4,650
Medicare: $75,000 x 1.45% = $1,087.50
Total FICA: $5,737.50/year or $220.67/biweekly paycheck

4. State & Local Taxes

State income tax varies dramatically by location:

• No state income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming
• Flat rate states: Arizona (2.5%), Colorado (4.4%), Illinois (4.95%), others
• Progressive rate states: California (1-13.3%), New York (4-10.9%), New Jersey (1.4-10.75%)

Some cities add local taxes too. New York City residents pay an additional 3.08-3.88% city tax. This means a New Yorker can face a combined marginal rate of over 50% on top income.

5. Pre-Tax Deductions

Pre-tax deductions reduce your taxable income, meaning you pay less in income tax. Common pre-tax deductions include:

Retirement Contributions

Traditional 401(k) contributions come out before income tax. In 2026, the employee contribution limit is $23,500 ($31,000 if you are 50 or older). If you contribute 10% of your $75,000 salary ($7,500), your taxable income drops to $67,500, saving you roughly $1,650 in federal tax (at the 22% marginal rate).

Health Insurance Premiums

Most employer health plans deduct premiums pre-tax. The average employee contribution for a family plan is about $6,500/year ($250/biweekly). This is excluded from both income tax and FICA.

HSA and FSA Contributions

Health Savings Accounts (HSA limit: $4,300 individual / $8,550 family in 2026) and Flexible Spending Accounts (FSA limit: $3,300) are powerful tax savings tools. Every dollar contributed avoids federal income tax, state income tax, and FICA -- a combined savings of 30-40%.

6. Post-Tax Deductions

Post-tax deductions do not reduce your taxable income but still lower your take-home pay:

• Roth 401(k) contributions: Taxed now, tax-free in retirement
• Life insurance premiums (above $50,000 coverage)
• Union dues
• Wage garnishments (child support, student loan default)
• After-tax voluntary benefits (pet insurance, legal plans)

7. Complete Paycheck Example

Let us walk through a full biweekly paycheck for someone earning $75,000/year in Illinois (4.95% flat state tax), contributing 10% to a 401(k), with family health insurance:

Line Item	Amount
Gross Pay	$2,884.62
401(k) Contribution (10%)	-$288.46
Health Insurance Premium	-$250.00
HSA Contribution	-$100.00
Taxable Pay	$2,246.16
Federal Income Tax	-$241.00
State Income Tax (IL 4.95%)	-$111.18
Social Security (6.2%)	-$178.85
Medicare (1.45%)	-$41.83
Net Pay (Take-Home)	$1,673.30

That is 58% of gross pay. The other 42% went to taxes (20%), retirement (10%), health care (9%), and savings (3%). Understanding these percentages helps you plan realistically.

8. How to Maximize Take-Home Pay

• Optimize your W-4: If you get a large tax refund each year, you are over-withholding. Adjust your W-4 to claim the correct number of allowances. A $3,000 refund means you gave the government a $250/month interest-free loan.
• Max out pre-tax benefits: HSA contributions save the most per dollar since they avoid income tax AND FICA. A $4,300 HSA contribution at a 30% combined tax rate saves $1,290/year.
• Traditional vs. Roth 401(k): If your current tax rate is higher than your expected retirement rate, traditional 401(k) saves more now. If you expect higher rates later, Roth may be better.
• Review benefits annually: During open enrollment, compare plan options. A higher-deductible health plan paired with an HSA often saves money for healthy individuals.

9. Frequently Asked Questions

Why does my first paycheck of the year have different withholding?

Federal tax withholding tables assume each paycheck represents a full year of income at that rate. Some payroll systems also reset year-to-date accumulators, which can cause minor differences in the first pay period.

What is the difference between biweekly and semi-monthly pay?

Biweekly means every two weeks (26 paychecks/year). Semi-monthly means twice per month on fixed dates like the 1st and 15th (24 paychecks/year). Semi-monthly paychecks are slightly larger. Our salary calculator converts between both.

Do I pay FICA on 401(k) contributions?

Yes. Traditional 401(k) contributions reduce your income tax but are still subject to Social Security and Medicare taxes. Only HSA and Section 125 (cafeteria plan) deductions avoid FICA.

How much should I contribute to my 401(k)?

At minimum, contribute enough to get the full employer match -- that is a guaranteed 50-100% return. Beyond that, financial advisors typically recommend saving 15-20% of gross income for retirement across all accounts.

Why did my take-home pay increase mid-year?

If your earnings exceed the Social Security wage base ($176,100 in 2026), the 6.2% Social Security deduction stops for the rest of the year. On a $200,000 salary, this would increase your net pay by about $620/paycheck for the last few months of the year.