Small Business Payroll Guide: Taxes & Deadlines

Small Business Payroll

Managing payroll is one of the most sensitive parts of running a small business. Paychecks must be accurate, and tax withholding must be handled correctly and on time.

This article covers what you need to know: how payroll taxes are calculated, when deposits are due, what happens if you’re late, and whether outsourcing makes sense for your business.

Depending on your business’s size, keeping up with payroll can turn into a full-time job. Payroll must be processed accurately for both employee paychecks and tax filings.

There is no room for errors or delays in payroll processing. How often you run payroll — weekly, bi-weekly, or monthly — depends on how you pay employees. That schedule is different from your tax deposit schedule, which the IRS sets separately. More on that below.

A larger workforce usually means more day-to-day adjustments. A missed time-clock punch, holiday pay, and vacation pay all need regular attention.

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Payroll tax law and tax codes change over time. Always use current rates and rules when processing payroll, not numbers from a prior year.

Payroll Tax Calculation Example

Payroll taxes are split between the employee and the employer, each paying a set percentage. The employer withholds the employee’s share and sends both portions to the IRS.

Let’s look at an example:

FICA (the Federal Insurance Contributions Act) funds Social Security and Medicare. It is mandatory for nearly every employee and employer in the U.S.

The Social Security portion is 12.4% total, split evenly: 6.2% from the employee and 6.2% from the employer. The Medicare portion is 2.9% total, split evenly: 1.45% from the employee and 1.45% from the employer. Combined, that’s 15.3% of wages.

For example, on a $1,000 weekly gross wage, the employee pays $62 in Social Security tax and the employer matches it with $62, for $124 total. The employee pays $14.50 in Medicare tax and the employer matches it with $14.50, for $29 total. Combined, that’s $153 in FICA tax — 15.3% of the $1,000 wage.

Total tax collected for a $1,000 wage example:

$124 Social Security: $1,000 x 12.4% = $124 — $62 employee, $62 employer

$29 Medicare: $1,000 x 2.9% = $29 — $14.50 employee, $14.50 employer

$153 Total FICA tax: $1,000 x 15.3% = $153

These rates apply to wages up to the annual Social Security wage base — $184,500 for 2026. Above that amount, the 6.2% Social Security tax stops applying for the rest of the year, though Medicare tax continues on all wages with no cap. High earners also owe an Additional Medicare Tax of 0.9% on wages above $200,000 (or $250,000 for married couples filing jointly).

This is just one example of how payroll tax is calculated. For more detail and current figures, see the References section below.

When Are Payroll Taxes Due?

Payroll tax deposits follow a monthly or semi-weekly schedule set by the IRS — not the same schedule you use to pay employees. The IRS decides which schedule applies to your business by reviewing the payroll taxes you reported on Form 941 over a 12-month lookback period. If your total tax liability during that window was $50,000 or less, you’re a monthly depositor. If it was more, you’re a semi-weekly depositor.

Regardless of schedule, if you accumulate $100,000 or more in undeposited taxes on any single day, that amount must be deposited by the next business day.

Falling behind on deposits is expensive. The IRS charges a Failure-to-Deposit penalty that increases the longer a deposit stays unpaid:

2% if the deposit is 1–5 days late
5% if it’s 6–15 days late
10% if it’s 16 or more days late
15% if it’s still unpaid 10 days after the IRS sends a notice

Beyond that penalty, unpaid payroll taxes can trigger a Trust Fund Recovery Penalty equal to 100% of the unpaid amount. This penalty can be assessed personally against the business owner or whoever is responsible for handling payroll — it isn’t limited to the business itself.

The money withheld from an employee’s paycheck for taxes isn’t the business’s money to spend. It belongs to the employee and the government. Setting those funds aside as soon as payroll runs, rather than treating them as available cash, is the simplest way to avoid deposit penalties.

For details on your specific deposit schedule, see the References section below.

Outsourcing

If your payroll gets too big to manage, or you’d rather not deal with it, you can hire someone full-time or outsource it to a company that specializes in payroll processing.

Whether you process payroll in-house or outsource it, keep a close eye on the numbers. Wages are a significant expense in any business and deserve regular review.

According to NSBA’s 2018 Small Business Taxation Survey, more than half of small firms with five or more employees paid an outside firm to prepare their payroll. This figure is dated, and current adoption rates should be verified if a more recent survey becomes available.

The Pros and Cons of Outsourcing Payroll

There are pros and cons to outsourcing your payroll.

When a competent company handles payroll, the advantages typically include:

More time to focus on running the business instead of processing payroll.
Immediate access to experienced, knowledgeable payroll staff.
Lower cost than hiring staff and building an in-house payroll department.
Payroll completed by a professional familiar with the process.
A provider that stays current with changing payroll laws.

The drawbacks can include:

Less direct control over a task that involves sensitive financial and personal data.
A data breach risk, particularly with providers that lack strong security and privacy safeguards.

Key Points and Facts About Small Business Payroll

FICA taxes total 15.3% of wages, split evenly between employer and employee: 12.4% for Social Security and 2.9% for Medicare.
Social Security tax applies only up to the annual wage base ($184,500 for 2026); Medicare has no wage cap, and high earners owe an extra 0.9% above certain thresholds.
Payroll tax deposits follow a monthly or semi-weekly IRS schedule based on a 12-month lookback period — separate from how often you pay employees.
Late deposits trigger IRS penalties starting at 2% and rising to 15%, plus possible personal liability through the Trust Fund Recovery Penalty.
More than half of small firms with five or more employees outsourced payroll preparation, per NSBA’s 2018 Small Business Taxation Survey — the most recent figure available on this point.

Action Steps for Small Business Payroll

Confirm your deposit schedule

Review your Form 941 filings from the lookback period to determine whether you’re a monthly or semi-weekly depositor.
Mark deposit due dates on a calendar separate from your payroll run dates.

Set withheld funds aside

Move withheld employee taxes and the employer match into a separate account as soon as payroll runs.
Avoid using withheld payroll tax funds for other business expenses.

Decide in-house vs. outsourced

Compare the cost of an in-house payroll process against a payroll service provider.
Check any prospective payroll provider’s security and data protection practices before signing on.

Checklist for Small Business Payroll

Deposit schedule confirmed
- You know whether you’re a monthly or semi-weekly depositor for the current year
Wage base tracked correctly
- Your payroll process stops applying the 6.2% Social Security tax once an employee crosses the annual wage base
High-earner withholding checked
- The Additional Medicare Tax is applied on wages above the applicable threshold
Employee records on file
- W-4s and other required payroll paperwork are complete and current for every employee on payroll
Payroll approach reassessed
- Your current in-house or outsourced setup has been reviewed within the past year, not just set and forgotten

FAQ: Small Business Payroll

What percentage of an employee’s wages goes to FICA tax?

FICA tax totals 15.3% of wages: 12.4% for Social Security and 2.9% for Medicare, split evenly between employer and employee.

Is my payroll schedule the same as my tax deposit schedule?

No. How often you pay employees and how often you deposit payroll taxes with the IRS are set separately. The IRS assigns a monthly or semi-weekly deposit schedule based on your prior tax liability.

What happens if I deposit payroll taxes late?

The IRS charges a Failure-to-Deposit penalty starting at 2% for deposits 1–5 days late, rising to 15% if the deposit remains unpaid 10 days after an IRS notice.

Should I outsource payroll or handle it in-house?

It depends on your team’s size, budget, and comfort handling sensitive payroll data. Outsourcing gives you access to specialists and can lower administrative cost; keeping it in-house gives you more direct control.

References: