Feeling Confused by Your Paycheck?

What’s the difference between payroll tax and income tax? If your paycheck looks smaller than expected, or the taxes on your pay stub seem off, you are not alone. Many employees and small business owners mix up payroll taxes with income taxes, which can make normal withholding look like an error. In this guide, Curler Accounting will explain how each tax works, where the money goes, and how to spot and fix common paycheck issues. You will get clear, practical examples so you can read your pay stub with confidence.

Curler Accounting & Tax Services, LLC serves individuals and small businesses in Washington County, Mequon, and communities north of Milwaukee. Led by Matt Curler, CPA, our firm handles tax preparation, accounting, payroll, and business consulting with a client-first approach. Matt’s 20 plus years in tax, finance, and treasury management, along with his service in the Wisconsin Army National Guard and the Milwaukee Police Department, shape the disciplined, ethical way we support our clients.

The Short Answer: What’s the Difference Between Payroll Tax and Income Tax?

Payroll tax and income tax are not the same. Payroll tax is mostly Social Security and Medicare. These are set percentages taken from wages and are also matched by your employer. Income tax is based on your taxable income and your filing situation, and it funds general government services. Employers withhold income tax from your paycheck as a prepayment toward your federal and state income tax bills.

Think of it this way: payroll taxes fund specific programs, while income taxes fund the broader budget. On your pay stub, payroll taxes usually show as Social Security and Medicare. Income taxes show as federal income tax and state income tax. Both reduce your take-home pay, but they have different rules, rates, and limits.

How Payroll Tax Works

FICA at a Glance

Payroll taxes for employees are often labeled FICA, which stands for the Federal Insurance Contributions Act. The FICA rates are split between Social Security and Medicare. Employees pay 6.2 percent for Social Security up to an annual wage limit and 1.45 percent for Medicare on all wages. Employers pay the same amounts on their side. The Social Security wage limit changes each year. As an example, the limit for 2024 is 168,600 dollars. After your year-to-date wages reach that amount, Social Security tax stops for the rest of that year. Medicare does not have a wage cap.

High earners may also see an Additional Medicare Tax of 0.9 percent on wages above certain thresholds. Employers start withholding it when your wages with them go over 200,000 dollars in a year. Your final Additional Medicare Tax is calculated on your tax return and depends on your filing status and total wages across all jobs.

Self-Employment Tax

If you are self-employed or receive 1099 income, you pay both the employee and employer parts through self-employment tax. The combined rate is generally 15.3 percent on net earnings, which includes 12.4 percent for Social Security up to the annual cap and 2.9 percent for Medicare with no cap. The Additional Medicare Tax rules can also apply. You can deduct half of your self-employment tax on your individual tax return, which reduces your taxable income. Curler Accounting helps sole proprietors, single-member LLCs, and S corporation owners plan for these costs and set up quarterly estimated payments, so there are no surprises at tax time.

Where Payroll Taxes Show Up on Your Pay Stub

• Social Security or OASDI, usually 6.2 percent of your gross wages until you hit the annual limit
• Medicare, usually 1.45 percent of your gross wages with no limit
• Additional Medicare, 0.9 percent on wages above certain thresholds, often starts when year-to-date wages pass 200,000 dollars

Your employer also pays their own matching Social Security and Medicare, but you will not see the employer match on your pay stub.

How Income Tax Works

Federal Income Tax Withholding

Federal income tax uses a progressive rate system. Withholding from each paycheck depends on the information you submit on Form W-4. This includes your filing status, dependents, other jobs, and any extra withholding you request. Your employer uses IRS withholding tables to estimate your yearly income based on your pay period and W-4 data. That estimate drives the withholding amount each payday. Your final tax is calculated on your tax return after credits and deductions.

Bonuses and supplemental wages can be taxed at a flat withholding rate or combined with regular wages depending on how your employer processes payroll. If your bonus check seems to have high federal withholding, this is often the reason, not an error.

State and Local Income Taxes

Most states also have income taxes and require withholding. Wisconsin has a state income tax with brackets that change over time. Your Wisconsin withholding depends on your taxable wages, your Wisconsin W-4, and your payroll frequency. Some states and localities add additional income taxes. Wisconsin does not have local income tax withholding, but if you live or work in another state, your withholding rules may differ. Curler Accounting regularly helps clients who live in one state and work in another sort out proper withholding and credits.

Where Income Taxes Show Up on Your Pay Stub

• Federal income tax, based on your W-4 and IRS tables
• State income tax, based on your state’s rules and your state W-4
• Local income tax if your city or locality requires it

Why Your Paycheck Taxes Can Look Wrong

Even when everything is correct, paychecks can vary and look odd. Below are common reasons your payroll tax or income tax withholding may look higher or lower than expected.

Frequent Reasons for Surprises

• You changed your W-4. Updating your filing status or dependent amount can shift your federal and state withholding starting with the next payroll.
• Pretax benefits reduced taxable wages. Contributions to 401(k), 403(b), HSA, or FSA lower the income used for income tax withholding. They usually do not reduce Social Security and Medicare, except for certain plan types.
• Bonus or commission pay. Supplemental wages may be withheld at flat rates or at higher amounts when combined with a larger paycheck.
• You reached the Social Security wage limit. When Social Security tax stops midyear, your net pay jumps for the rest of the year. This change can surprise people.
• Additional Medicare tax kicked in. Higher earners see a new line for Additional Medicare once wages pass a threshold.
• You have multiple jobs. Each employer withholds as if that job is your only one, which can cause under-withholding. Using the multiple jobs section of Form W-4 can help.
• Benefit changes. Starting or stopping health insurance, dental, vision, or life insurance can change taxable wages and withholding.
• Payroll frequency changed. Switching from biweekly to semimonthly or monthly changes the per-paycheck withholding pattern.
• Arrears or adjustments. Catch-up withholding or correcting a prior error can shift a single paycheck.
• Wrong state set up. Moved to a new state, remote work, or job site changes can lead to a state withholding mismatch.

A Simple Example

Suppose your gross pay is 1,500 dollars for a biweekly paycheck. Social Security at 6.2 percent is 93 dollars. Medicare at 1.45 percent is 21.75 dollars. Those are payroll taxes. Income tax withholding depends on your W-4 and your tax bracket. Two workers with the same 1,500 dollars of gross pay can have very different federal withholding because one claims dependents and contributes to a 401(k), while the other does not. Both would still pay the same Social Security and Medicare amounts on that paycheck.

How to Fix a Paycheck Tax Mistake

1. Compare your pay stub to prior paychecks. Look at gross pay, pretax deductions, and year-to-date totals for Social Security, Medicare, and income taxes.
2. Check your Form W-4 and state W-4. Confirm your filing status, dependents, and whether you listed multiple jobs or extra withholding.
3. Verify pretax deductions. 401(k), HSA, and FSA contributions reduce taxable wages for income tax purposes and can change your withholding.
4. Review supplemental pay. Bonuses and commissions may follow different withholding rules. Ask payroll how they processed the payment.
5. Watch the Social Security cap. If Social Security tax stopped, that can be correct once you reach the annual limit.
6. Confirm your state and locality. If you moved or now work remotely, your withholding state may need an update.
7. Ask HR or payroll to explain any unusual lines. A quick conversation often clears up misunderstandings.
8. Submit an updated W-4 if needed. You can request a specific extra withholding amount per paycheck to fine-tune your year-end outcome.
9. Use a withholding estimator to project your full-year taxes. This helps you set accurate withholding and avoid a big balance due or refund.
10. Contact Curler Accounting. We will review your pay stubs, W-4, and benefits to make sure your withholding is aligned with your goals.

Employees, Self-Employed Workers, and Small Business Owners

Employees

If you are a W-2 employee, your employer handles withholding and payroll tax deposits. Your main job is to keep your W-4 current and understand how benefits and bonuses impact your taxes. Curler Accounting can walk you through your pay stub and recommend W-4 changes that match your situation.

Self-Employed and 1099 Workers

If you are self-employed, you pay self-employment tax and income tax through quarterly estimated payments. You control your own withholding schedule, so planning matters. Track net income, set aside funds for taxes, and time deductions like retirement contributions and equipment purchases. Curler Accounting helps set up a simple tax-saving plan and keeps your books clean so your estimates are accurate.

Small Employers

As an employer, you must withhold payroll tax, match FICA, deposit taxes on schedule, and file returns like Forms 941 or 944. You also issue W-2s to employees and 1099s to vendors. In Wisconsin, there are state withholding filings and unemployment reporting to manage. Curler Accounting’s payroll solutions make this hassle-free, from setup to deposits and filings. We integrate payroll with your bookkeeping so cash flow, taxes, and compliance stay in sync.

Other Paycheck Deductions That Are Not Taxes

Many paycheck deductions are not taxes at all. They change your net pay and your taxable wages, which can make tax lines look odd.

• Retirement contributions like 401(k) and 403(b) reduce federal and state taxable wages, but usually not FICA.
• HSA and FSA contributions can be pretax for income tax and for FICA in many plans.
• Health, dental, and vision premiums may be pretax through a cafeteria plan.
• Life and disability insurance can be pretax or post-tax, which affects whether benefits are taxable later.
• Union dues, garnishments, and charitable deductions are not taxes but still reduce take-home pay.

Curler Accounting can explain which deductions reduce which taxes and help you choose benefits that fit your budget and tax plan.

Wisconsin Notes for Workers and Employers

Wisconsin has state income tax withholding, but no local income tax withholding. If you work in Wisconsin but live in another state, or the reverse, your withholding and credits can get complex. Remote work can also shift which state has the right to tax your wages. Employers must register for Wisconsin withholding, deposit on the correct schedule, and file required returns. Curler Accounting supports employees and businesses across Washington County, Mequon, and the Milwaukee area with both local and virtual services statewide.

FAQs: What’s the Difference Between Payroll Tax and Income Tax?

Is payroll tax the same as income tax?

No. Payroll tax is Social Security and Medicare. Income tax is federal and state income tax based on taxable income, filing status, and credits. Both are withheld, but they are separate taxes with different rules.

Why did my Social Security tax stop midyear?

You likely reached the annual Social Security wage limit. After you hit that cap, Social Security withholding stops, but Medicare continues. This is normal and increases your net pay for the rest of the year.

Why was my bonus taxed so high?

Bonus and supplemental pay can use a flat withholding method or be combined with regular wages. Either method can make one paycheck look heavily taxed. Your actual annual tax is settled on your tax return.

How do I adjust my withholding?

Submit an updated W-4 to your employer and consider adding a set extra withholding amount per paycheck. Review again after life changes such as marriage, a new child, a home purchase, or a second job.

What if I am self-employed?

You pay self-employment tax and income tax through quarterly estimates. Keep good books, plan ahead, and work with Curler Accounting to avoid year-end surprises.

About Curler Accounting and Matt Curler, CPA

Curler Accounting & Tax Services, LLC is led by Matt Curler, CPA. Matt brings more than two decades of experience in tax, finance, and treasury. He has served at KPMG and Harley-Davidson, where he built deep expertise in tax strategy and compliance. A veteran of the Wisconsin Army National Guard, he served 18 years as a Military Police Officer with two Iraq deployments, then six years with the Milwaukee Police Department. His discipline, integrity, and attention to detail guide every client relationship.

Services Offered by Curler Accounting

• Tax Preparation and Planning to help minimize tax liabilities
• Bookkeeping for accurate financial records
• Payroll Solutions for hassle-free payroll processing
• Cash Flow Optimization to improve liquidity
• Business Tax and Compliance for LLCs, S corporations, and more
• IRS Representation for audits and disputes
• Entity Formation and guidance on choosing the right tax structure

Why Clients Choose Curler Accounting

• Personalized Service with hands-on attention
• Military Precision and Integrity in financial management
• Small Business Focus with practical growth strategies
• Community Commitment through the Rotary Club and VA Hospital volunteer work
• Local and Virtual Services for Mequon and clients statewide online

From pay stub questions to payroll processing and tax planning, Curler Accounting makes financial management simple, stress-free, and results-driven.

Practical Tips to Keep Your Withholding on Track

• Update your W-4 at least once a year and after major life changes.
• Check both current and year-to-date totals on your pay stub.
• Review your pretax benefits during open enrollment and confirm which taxes they reduce.
• If you have multiple jobs, use the multiple jobs section of the W-4 to avoid under-withholding.
• If you prefer a smaller refund, reduce extra withholding. If you prefer a cushion, add a fixed extra amount per check.
• For self-employed income, set aside a percent of each payment for taxes and schedule quarterly estimates.
• For small employers, automate payroll tax deposits and filing to avoid penalties.

Get Clear Answers Today

If you still wonder what’s the difference between payroll tax and income tax for your situation, bring your questions to Curler Accounting. We will review your pay stub, benefits, and W-4, and we will explain each line in plain language. For small businesses, we handle payroll from end to end and connect it to your bookkeeping, tax planning, and cash flow. Our team is local to Washington County and Mequon and we work with clients across Wisconsin online.

Your paycheck should not be a mystery. With Curler Accounting, you will know why each tax is withheld, how to fix errors fast, and how to keep more of what you earn within the rules. Reach out to Curler Accounting & Tax Services, LLC for a friendly, professional review and take control of your paycheck with confidence.