A geological fault is a break where pressure builds beneath the surface. Payroll has its own fault lines: small errors in wage tracking, withholding, or year-to-date totals can create larger problems at month-end, quarter-end, and year-end.
As of 2026, the most important federal payroll change for many small businesses is the higher Social Security wage base. The taxable wage maximum is now $184,500, up from $176,100 in 2025.
The basic FICA rates remain straightforward:
- Social Security: 6.2% for the employee and 6.2% for the employer, subject to the annual wage base
- Medicare: 1.45% for the employee and 1.45% for the employer, with no wage cap
- Additional Medicare Tax: 0.9% paid by the employee only on wages above the employer withholding threshold of $200,000
Accurate payroll depends on more than applying a percentage. You need cumulative wage tracking, clean payroll records, and a process for reviewing exceptions before they become costly corrections.
1. The 2026 Social Security wage base is $184,500
The Social Security wage base is the maximum amount of an employee’s wages subject to Social Security tax during 2026.
For wages paid in 2026:
- Employee Social Security rate: 6.2%
- Employer Social Security rate: 6.2%
- Combined employer and employee rate: 12.4%
- Social Security wage base: $184,500
- Maximum employee Social Security tax: $11,439
- Maximum employer Social Security tax: $11,439
The maximum is calculated as:
$184,500 × 6.2% = $11,439
Once an employee reaches $184,500 in Social Security wages for the year, additional wages are no longer subject to the 6.2% Social Security tax. Medicare tax continues, however.
The 2026 wage base is $8,400 higher than the 2025 limit. That increase affects payroll forecasting for employees who earn more than the annual wage base, including executives, sales professionals, specialized workers, and employees receiving bonuses or commissions.
The Social Security Administration’s Contribution and Benefit Base provides the annual wage base. The IRS also lists the 2026 limit in Topic No. 751, Social Security and Medicare withholding rates.
2. Medicare tax applies to all covered wages
Medicare tax works differently from Social Security tax. There is no wage base limit for Medicare.
As of 2026:
- Employee Medicare rate: 1.45% on all covered wages
- Employer Medicare rate: 1.45% on all covered wages
- Combined standard Medicare rate: 2.9%
- Additional Medicare Tax: 0.9% for the employee only when applicable
An employee earning $50,000 and an employee earning $500,000 both have Medicare tax calculated on their full covered wages. The Social Security tax stops at $184,500, but the standard 1.45% Medicare tax continues through the rest of the calendar year.
This distinction matters when you estimate the employer cost of raises, bonuses, and other compensation. The payroll calculation does not stop entirely when an employee reaches the Social Security wage base.
For example, a $20,000 bonus paid after an employee has already reached the Social Security wage base is not subject to additional Social Security tax. It remains subject to the standard 1.45% Medicare tax for both the employee and employer. Additional Medicare withholding may also apply to the employee if the employer’s cumulative wages exceed $200,000.
3. Real-world payroll calculations for 2026
The following examples focus on federal FICA taxes. They exclude federal income tax withholding, state and local taxes, benefit deductions, retirement contributions, and other payroll items.
Employee earning $120,000
Because the employee earns less than the $184,500 Social Security wage base, the full salary is subject to both Social Security and Medicare tax.
Employee withholding:
- Social Security:
$120,000 × 6.2% = $7,440 - Medicare:
$120,000 × 1.45% = $1,740 - Additional Medicare Tax:
$0 - Total employee FICA:
$9,180
Employer taxes:
- Social Security:
$7,440 - Medicare:
$1,740 - Total employer FICA:
$9,180
The employee’s approximate federal FICA withholding is 7.65% of wages in this example, before considering any Additional Medicare Tax.
Employee earning $250,000
The first $184,500 is subject to Social Security tax. Medicare applies to all $250,000 of wages. The employee also reaches the $200,000 threshold for employer withholding of Additional Medicare Tax.
Employee withholding:
- Social Security:
$184,500 × 6.2% = $11,439 - Standard Medicare:
$250,000 × 1.45% = $3,625 - Additional Medicare Tax:
($250,000 − $200,000) × 0.9% = $450 - Total employee FICA:
$15,514
Employer taxes:
- Social Security:
$11,439 - Standard Medicare:
$3,625 - Additional Medicare Tax match:
$0 - Total employer FICA:
$15,064
The employer does not match the 0.9% Additional Medicare Tax. It is an employee-only tax.
The IRS explains in Topic No. 751 that employers begin withholding Additional Medicare Tax in the pay period when wages exceed $200,000 and continue withholding it through the end of the calendar year.
4. Additional Medicare Tax requires simple but careful tracking
Additional Medicare Tax is often misunderstood because the employer withholding threshold is not the same as every employee’s final tax threshold.
For payroll withholding, the employer uses a $200,000 wage threshold regardless of the employee’s tax filing status. Once wages paid by that employer exceed $200,000 during the calendar year, the employer withholds an additional 0.9% from wages above that amount.
There is no employer match.
An employee’s final Additional Medicare Tax liability may depend on filing status and total applicable income. An employee with more than one employer may also have wages from multiple sources that affect the individual’s final tax calculation. Payroll withholding and final individual tax liability are related, but they are not identical calculations.
A practical payroll process looks like this:
- Track each employee’s cumulative Medicare wages throughout the year.
- Flag the pay period in which wages exceed $200,000.
- Apply the additional 0.9% only to wages above the withholding threshold.
- Continue the withholding for the rest of the calendar year.
- Keep payroll records that show when the threshold was reached and how the tax was calculated.
- Remind employees that withholding does not replace their responsibility to review their personal tax situation.
The key control is cumulative tracking. Payroll software may automate the calculation, but the business still needs accurate employee records and clean year-to-date data.
5. Employees and self-employed owners are taxed differently
Employees generally split Social Security and Medicare taxes with their employers. A business with employees normally withholds the employee share and pays its matching employer share.
Self-employed individuals generally pay both halves through self-employment tax:
- Social Security: 12.4% total
- Medicare: 2.9% total
- Additional Medicare Tax: 0.9% may apply when the applicable threshold is exceeded
The self-employment tax calculation is not simply a percentage of gross business revenue. The IRS generally starts with net earnings from self-employment and applies statutory adjustments. The Social Security portion is subject to the annual wage base, while Medicare tax applies to all applicable net earnings.
The distinction can affect how an owner plans cash flow, estimated tax payments, distributions, and compensation. Business structure also matters. A sole proprietor, independent contractor, partnership partner, and owner of an LLC may have different reporting and payment considerations.
The IRS guidance on self-employment tax explains the general rules and identifies the types of business owners who may be subject to self-employment tax.
State payroll rules may vary. State income tax withholding, unemployment taxes, paid leave programs, local taxes, and registration requirements are separate from the federal FICA figures covered here. If your business operates across states or has remote employees, payroll records may require additional review.
6. What Business Owners Should Do Now
The 2026 wage base change is easy to understand. Implementing it accurately requires a disciplined payroll process.
You may want to consider this action plan:
- Update payroll software and payroll tables for the 2026 Social Security wage base of $184,500.
- Confirm that employee and employer Social Security taxes use the 6.2% rate.
- Confirm that standard Medicare tax uses the 1.45% employee and employer rate on all covered wages.
- Check that payroll tracks cumulative wages by employee and stops Social Security withholding after the wage base is reached.
- Review high earners, owners, commissioned employees, and anyone expected to receive a bonus.
- Confirm that Additional Medicare withholding begins when an employee’s wages paid by your business exceed $200,000.
- Verify that the 0.9% Additional Medicare Tax is withheld from the employee only, with no employer match.
- Reconcile payroll reports to the general ledger at least monthly.
- Review payroll tax liabilities before each payment or filing deadline shown in your payroll system and official tax instructions.
- Keep federal payroll records separate from state payroll calculations, since state rules may vary.
- Document any manual adjustment, off-cycle payroll, bonus calculation, or correction.
A monthly payroll reconciliation can catch problems before they spread across quarterly reports, employee Forms W-2, and financial statements. Compare gross wages, taxable wages, employee withholdings, employer taxes, payroll liabilities, and payments made.
LunaSi Accounting, LLC can help organize payroll support, bookkeeping, account reconciliations, and financial reporting so your payroll data connects cleanly to your books. Reliable records give you a clearer view of labor costs, cash flow, and operating performance.
Start with one review: confirm your 2026 wage base and payroll settings. Then build a monthly reconciliation habit: so by the end of the quarter, you are operating from financial information that is clear, accurate, and ready for decisions. Contact LunaSi Accounting, LLC to discuss payroll support and bookkeeping assistance.
This content is for general informational purposes and is not legal, tax, or accounting advice. Consult a qualified professional for your specific situation.
31.08.2026