Our guide takes the guesswork and stress out of learning how to calculate payroll and payroll taxes for your business without an accountant.
The best payroll software automatically calculates payroll and payroll taxes, so most business owners never have to worry about manual calculations. However, learning how to calculate payroll is a useful skill for business owners, even if you never have to do so manually.
This guide breaks down everything you need to know about payroll calculations, from calculating payroll taxes to handling wage deductions. Let’s dive in.
What Is The Formula For Calculating Payroll Taxes?
The formula for calculating payroll taxes is:
(Gross Income) X (Payroll Tax Rate) = Payroll Tax Liability
Each payroll tax rate percentage should be converted to a decimal. To do so, divide the rate by 100.
You’ll need to calculate each payroll tax individually and subtract each liability from your employee’s gross earnings.
What To Know Before Calculating Payroll
Before beginning the process of manually calculating payroll, you’ll need to determine your employees’ tax withholding, understand the difference between gross pay vs net pay and post-tax pay deductions, and figure out your state’s payroll taxes.
Keep reading for a breakdown of the most important things to know before calculating payroll, or jump ahead to the first step of calculating payroll.
Employee Tax Withholding: Wage Bracket Method VS Percentage Method
To determine federal income tax, you’ll need to have your employee’s W-4 handy and their gross pay calculation. As of 2020, federal income tax withholdings can use either the wage bracket method or the percentage method.
These methods are done using tables on the IRS Publication 15-T form. If an employee’s withholdings haven’t changed since prior to 2020, you can use the previous version of the table.
Wage Bracket Method
Withholdings are determined by W-4 filing status and gross pay. Filing status from an employee’s W-4 form can be:
- Married filing jointly
- Single head of household
- Single or married filing separately
Payroll period options are as follows:
- Daily
- Weekly
- Biweekly
- Semi-monthly
- Monthly
- Quarterly
- Semiannually
- Annually
With gross pay calculated in one of these payroll periods, find the box on the corresponding wage bracket method table on the 15-T form that represents the employee’s filing status and gross pay. Note that this method only covers up to approximately $100,000 in annual wages. Employers will need to use the percentage method for employees with gross pay exceeding $100,000.
Percentage Method
Similar to the wage bracket method, the percentage method uses a table with information on gross pay and filing status. However, this method also requires calculating a percentage to add to this flat dollar amount. Consult the IRS 15-T table to find the correct calculations. Figuring out how much to withhold is the bulk of the work, but you’re not out of the woods just yet. You still need to pay the federal and (probably) state income tax you withheld.
Employers must use Form 941 to report withholdings to the IRS every quarter. This includes entering information for employees who received wages, tips, etc., as well as the total federal income tax withheld for the quarter.
If withholdings are $2,500 or more, you’ll have to make an online deposit through the IRS EFTPS system.
Gross Pay, Post-Tax Pay, & Net Pay
While calculating payroll, there are three pay totals that you’ll need to familiarize yourself with to ensure that your calculations are accurate: gross pay, post-tax earnings, and net pay.
- Gross Pay: Gross pay is an employee’s total earnings before payroll taxes and other deductions are made. Contractors and withholding-exempt employees are paid their gross earnings (unless voluntary deductions are made).
- Post-Tax Pay: Post-tax earnings are the wages left after payroll taxes have been deducted. Payroll deductions such as Roth IRA contributions, health insurance premiums, and wage garnishments are subtracted from post-tax earnings, not gross pay.
- Net Pay: Net pay is the amount of wages an employee takes home after payroll taxes and other payroll deductions are made.
State Payroll Taxes
Ultimately, business owners are responsible for determining, withholding, and paying any state and local-level payroll taxes owed. State payroll taxes include:
- State income tax
- State unemployment tax
- State benefits contributions
- Local level taxes
How To Calculate Payroll in 8 Steps
To calculate payroll, you need to subtract payroll taxes and deductions from an employee’s gross pay.
The following step-by-step instructions will take you through the process of calculating payroll and managing payroll taxes for your small business.
Step 1: Calculate Your Employee’s Gross Pay
Gross pay is the total money earned by an employee before deductions and taxes are subtracted.
To calculate gross pay for an employee, you’ll have to add up an employee’s total wages, salary, commission, tips, year-end bonuses, and any other form of earnings.
Let’s break down how to calculate the various types of earnings that go into a W-2 employee’s gross pay for each paystub.
How To Calculate Gross Pay For Salaried Employees
Salaried employees have an annual salary usually paid out in two-week increments. For example, if your employee has an annual salary of $40,000 and you pay biweekly, there would be 26 pay periods.
Using the gross salary calculation below, we can see that $40,000 divided by 26 would yield $1,538.46
(Annual Salary) / (Number of Annual Pay Periods) = Gross Salary
How To Calculate Gross Pay For Hourly Employees
To calculate gross pay for hourly employees, multiply the employee’s hourly wage by the number of hours worked in the pay period.
(Hourly Rate) x (Hours Worked) = Gross Pay
For employees earning hourly wages, you’ll need to have their hourly rate handy and the number of hours they worked during the pay period. If your employee has worked 40 hours at $15/hour during the pay period, their gross hourly wages will total $600.
Step 2: Add Supplemental Earnings To Gross Pay
As gross pay includes both traditional wages and supplemental earnings, the next step in the payroll calculation is to add supplemental pay to your employee’s hourly and salaried earnings.
Supplemental earnings are any wages earned outside of hourly or salaried wages, including overtime, tips, commission, and more.
As supplemental earnings differ, you’ll have to do the math for each item individually before adding it to the existing gross pay earned during the current pay period according to your payroll schedule.
Here’s a look at how to calculate the most common supplemental earnings.
How To Calculate Overtime Pay
Overtime refers to pay for hours worked beyond a specific weekly threshold (often 40 hours), that requires employees to earn at least time and a half.
Most hourly employees earn overtime pay for hours worked beyond 40, whereas most exempt salaried employees do not qualify for overtime if they make $35,568 or more annually (or $684 per week).
To calculate overtime pay, multiply the hourly rate by the overtime rate and then multiply that by the number of overtime hours worked.
(Hourly Rate x Overtime Rate) x (Overtime Hours Worked) = Gross Overtime Pay
For example, let’s say your employee usually works 40 hours at $15/hour. This week they worked five hours of overtime.
You pay an overtime rate of 1.5 times the normal rate, so their total overtime pay would be calculated like this: ($15/hr x 1.5) x 5 hours = $112.50.
How To Calculate Tips
Some workers, especially in the foodservice industry, receive tips from customers. Regulation varies by state and industry, but some portion of tips may be counted toward meeting minimum wage requirements.
There are two ways to calculate tips:
Calculation 1: (Wages) + (Tip Credit) = Hourly Wage
Calculation 2: (Hourly Wage x Hours Worked) + (Remaining Tips) = Gross Pay
Example: A foodservice worker earning $15/hour over 50 hours, with $350 in tips.
- Using Calculation 1: $10 + $5 = $15/hour
- Using Calculation 2: ($15 x 50 hours) + $100 = $900
Calculating tips for payroll also depends on how a small business allocates tips.
Tip Pooling Calculation: (Total Tips) x (Individual Employee Hours Worked / All Employee Hours Worked)
How To Calculate Commission Pay
A commission represents a percentage from a sale or transaction that an employee receives as earnings. Commissions may also be offered at a flat-rate.
To calculate percentage-based commission pay, multiply the sale amount by the commission rate.
(Total Sale Value) X (Commission Rate) = Commission Earnings
For example, let’s consider an employee that makes a $1,000 sale and earned a 5% commission.
$1,000 X .05 = $50. In this example, the employee has earned a $50 commission on their $1,000 sale.
Don’t forget that commissions are taxed. The simplest approach for employers is to withhold a flat 22% tax on the employee’s commission. Otherwise, you can consult the instructions on page 20 of the 15-T form.
Step 3: Calculate Federal, State, & Local Income Tax
Income tax is just the first of the payroll taxes you’ll need to calculate.
Generally, you can calculate income tax by multiplying your employee’s gross earnings by the going tax rate. You’ll subtract federal, state, and local income tax liabilities from your employee’s gross pay.
(Gross Earnings) X (Income Tax Rate) = Income Tax Owed
You can use the same formula (not tax rates!) to calculate federal, state, and local income tax liabilities.
How To Calculate Federal Income Tax
The federal government uses a progressive tax rate, with high-income earners taxed at higher rates. Under a progressive tax rate, employee earnings are based on the tax bracket the earnings fall under.
(Gross Earnings) X (Federal Income Tax Rate) = Federal Income Tax Owed
For example, under the current federal income tax bracket system, an individual earning $40,000 annually will have the first $11,000 of their income taxed at a 10% rate, and the remaining $29,000 of their income taxed at a 12% tax rate.
How To Calculate State Income Tax
All but nine states levy an income tax, in addition to the federal income tax. State income tax rates vary, but are commonly progressive or flat rates.
To calculate progressive income tax, you need to multiply the employee’s gross income by the applicable tax rate.
(Gross Earnings) X (State Income Tax Rate) = State Income Tax Owed
For example, Massachusetts state income taxes are charged as a flat 5% income tax rate on all residents. We’ll consider an employee with $1,500 in gross wages for the pay period. To calculate state income tax, we’ll use the following formula:
$1,500 X .05 = $75
In this example, the Massachusetts employee would have a $75 state income tax liability.
How To Calculate Local Income Tax
Local income tax is rare but increasingly common. Many cities charge a flat rate or a progressive income tax.
To calculate the local income tax, you’ll need to multiply the local income tax rate by your employee’s gross earnings.
(Gross Earnings) X (Local Income Tax Rate) = Local Income Tax Owed
For example, let’s use a salaried resident of Wilmington, Delaware who is required to pay a flat 1.5% income tax on their $2,500 monthly earnings.
$2,500 X .015 = $37.50 per pay pay period.
So, the employee is responsible for paying $37.50 in income taxes per month.
Step 4: Calculate Federal Payroll Taxes: Social Security, Medicare, & FUTA
To learn how to calculate federal payroll taxes, you’ll first need to know the federal payroll tax rates. Here’s a breakdown of federal payroll taxes and their rates:
- Social Security Tax: The combined Social Security tax rate is 12.4%, with employers responsible for paying 6.2% out of pocket and withholding the employee’s 6.2% share. Social Security taxes total 12.4% and may be levied up to the $147,000 taxable wage limit.
- Medicare Tax: The combined Medicare tax is 2.9%, with employers responsible for paying 1.45% out of pocket and withholding the employee’s 1.45% share. Medicare tax increases by 0.9% for individuals earning over $200,000 annually.
- Federal Unemployment Insurance Tax: The current FUTA tax rate is 6% on the first $7,000 in wages paid to an employee per tax year.
Subtract federal payroll tax liabilities from your employee’s gross pay.
How To Calculate Social Security Taxes
To calculate social security taxes, multiply the Social Security tax rate by the employee’s gross earnings for the pay period.
(Gross Pay) X (Social Security Rate) = Social Security Tax Liability
For example, let’s calculate Social Security taxes for an employee with $2,000 in gross earnings.
Plugging in the numbers, the equation looks like this: ($2,000) X (.062) = $124.
In this example, the employer owes $124 in Social Security taxes and would pay that out of pocket. The employer would also be responsible for withholding an additional $124 from their employee’s gross income. In total, $248 must be allocated toward Social Security taxes.
As of 2023, the Social Security tax is not deducted on incomes exceeding $160,200. This amount changes annually, so be sure to find up-to-date information.
How To Calculate Medicare Taxes
To calculate Medicare taxes, multiply the 1.45% medicare tax rate by your employee’s gross earnings.
Gross Pay X Medicare Tax Rate = Medicare Tax Liability
We can calculate the Medicare tax liability for an employee earning $2,000 in gross wages. In this example, we multiply $2,000 by .0145 to get $29 in Medicare taxes owed.
Like Social Security, Medicare follows a fixed rate, and its payment is divided evenly between employers and employees, so your medicare tax liability is the same as your employee’s.
How To Calculate Federal Unemployment Insurance (FUTA) Contributions
Federal employment insurance contributions (FUTA taxes) are not deducted from employee paychecks but are paid out-of-pocket by employers. However, you’ll still need to make federal employment insurance calculations to make sure you pay the correct amount.
To calculate FUTA taxes, you must multiply your employee’s gross pay by 6% up to the first $7,000 they are paid in the year.
(Gross Wage) X (0.06 FUTA Tax Rate) = FUTA Tax Liability
Step 5: Subtract State Payroll Taxes From Gross Earnings
In addition to state-level income tax, states may also levy payroll taxes for employee benefits or state programs. The most common state-level payroll tax is state unemployment insurance (SUTA), which is taxed at a different rate depending on your state.
Other state payroll deductions may include contributions to state employee benefits plans. For example, some Massachusetts employees pay 0.0063% as a contribution to the state’s paid family leave program.
The IRS maintains a directory of state websites to help businesses find the most up-to-date state payroll tax rates.
Step 6: Subtract Pre-Tax Payroll Deductions
After you’ve covered income taxes, Social Security, and Medicare, there may be more deductions you’ll need to make from employees’ pre-tax gross pay. Deductions may be mandatory or voluntary. Here are some potential payroll deductions that may apply to your employee:
- 401(k) Contributions: Payments made toward a 401(k) or retirement fund are deducted because they aren’t taxable.
- Health Insurance: A deduction is made for the amount an employee contributes to their own health, dental, vision, or other medical insurance.
- Life Insurance: This voluntary deduction goes toward the employer’s cost of paying for coverage.
- Reimbursements: Payments for meals, mileage, per diem, lodging, etc., are nontaxable and should be deducted.
Step 7: Subtract Post-Tax Deductions & Wage Garnishments
Once you’ve deducted payroll taxes and pre-tax payroll deductions, you’ll need to subtract any applicable post-tax deductions from the employee’s remaining earnings.
Post-tax deductions include:
- Wage garnishments
- Roth IRA contributions
- Voluntary charity donations
- Employee benefits contributions
- Disability insurance
- Union dues
The amount of these post-tax deductions will vary depending on which ones apply to your employee.
Step 8: Calculate Net Pay
To calculate an employee’s net pay, subtract all tax withholdings, payroll deductions, and wage garnishments from the employee’s gross wages.
This is the amount paid that employees are paid through direct deposit or physical paycheck. Net pay will show up alongside gross pay on an employee’s pay stub.
Once you’ve finalized all your calculations, you can cut the checks.
Use Payroll Software To Simplify Payroll Calculations
Manually calculating payroll and payroll taxes can be time-consuming, and making costly mistakes is easy. Moreover, as your business grows, manually handling payroll becomes even more inefficient, especially when you consider the option to automate and streamline the payroll process with payroll software.
That being said, many small businesses choose to handle payroll manually as a means to save money on payroll costs. However, there are solid cheap payroll software options on the market that help you save on costs while still handling all basic payroll tax calculations for you.
In short, the right payroll software can save your business time and make running payroll easy, from your first FICA tax payment to calculating employee bonuses.
The Bottom Line On How To Calculate Payroll
As an employer, your payroll tax responsibilities are two-fold: you have to withhold the right amount of taxes from employee paychecks and pay your business’s payroll tax liabilities on time.
We recommend investing in a payroll software solution that can help you keep everything organized, automate payroll tax calculations and payments, and ensure that your employees are paid on time with the right amounts withheld.
Although payroll software is an investment, the benefits of payroll software can definitely outweigh any payroll software costs. Otherwise, you may consider an accountant to help manage your business’s payroll taxes.