// Function to show/hide state allowances based on selected state
document.getElementById('state').onchange = function() {
var state = document.getElementById('state').value;
var stateAllowancesContainer = document.getElementById('stateAllowancesContainer');
if (state === 'california' || state === 'new_york') { // States that typically use allowances in simplified models
stateAllowancesContainer.style.display = 'block';
} else {
stateAllowancesContainer.style.display = 'none';
}
};
function calculatePayroll() {
// Input values
var hourlyWage = parseFloat(document.getElementById('hourlyWage').value);
var hoursPerWeek = parseFloat(document.getElementById('hoursPerWeek').value);
var payFrequency = document.getElementById('payFrequency').value;
var federalFilingStatus = document.getElementById('federalFilingStatus').value;
var federalAllowances = parseInt(document.getElementById('federalAllowances').value);
var state = document.getElementById('state').value;
var stateAllowances = parseInt(document.getElementById('stateAllowances').value);
var preTaxDeductions = parseFloat(document.getElementById('preTaxDeductions').value);
var postTaxDeductions = parseFloat(document.getElementById('postTaxDeductions').value);
// Validate inputs
if (isNaN(hourlyWage) || hourlyWage < 0 ||
isNaN(hoursPerWeek) || hoursPerWeek < 0 ||
isNaN(federalAllowances) || federalAllowances < 0 ||
isNaN(stateAllowances) || stateAllowances < 0 ||
isNaN(preTaxDeductions) || preTaxDeductions < 0 ||
isNaN(postTaxDeductions) || postTaxDeductions < 0) {
alert("Please enter valid positive numbers for all input fields.");
return;
}
// — Step 1: Calculate Gross Pay per Pay Period —
var weeksPerPayPeriod;
var payPeriodsPerYear;
switch (payFrequency) {
case 'weekly':
weeksPerPayPeriod = 1;
payPeriodsPerYear = 52;
break;
case 'bi-weekly':
weeksPerPayPeriod = 2;
payPeriodsPerYear = 26;
break;
case 'semi-monthly':
weeksPerPayPeriod = 52 / 24; // Approx 2.1667 weeks per semi-monthly period
payPeriodsPerYear = 24;
break;
case 'monthly':
weeksPerPayPeriod = 52 / 12; // Approx 4.3333 weeks per month
payPeriodsPerYear = 12;
break;
default: // Default to bi-weekly if something goes wrong
weeksPerPayPeriod = 2;
payPeriodsPerYear = 26;
}
var grossPayPerPeriod = hourlyWage * hoursPerWeek * weeksPerPayPeriod;
var annualGrossPay = grossPayPerPeriod * payPeriodsPerYear;
// — Step 2: Calculate Taxable Gross Pay —
var annualPreTaxDeductions = preTaxDeductions * payPeriodsPerYear;
var taxableGrossPayPerPeriod = grossPayPerPeriod – preTaxDeductions;
var annualTaxableGrossPay = annualGrossPay – annualPreTaxDeductions;
// Ensure taxable gross doesn't go below zero
if (taxableGrossPayPerPeriod < 0) taxableGrossPayPerPeriod = 0;
if (annualTaxableGrossPay < 0) annualTaxableGrossPay = 0;
// — Step 3: Calculate FICA Taxes (Social Security & Medicare) —
// Social Security: 6.2% up to annual limit ($168,600 for 2024)
// Medicare: 1.45% no limit
var socialSecurityLimit = 168600; // 2024 limit
var socialSecurityTaxable = Math.min(annualGrossPay, socialSecurityLimit);
var annualSocialSecurityTax = socialSecurityTaxable * 0.062;
var socialSecurityTaxPerPeriod = annualSocialSecurityTax / payPeriodsPerYear;
var annualMedicareTax = annualGrossPay * 0.0145;
var medicareTaxPerPeriod = annualMedicareTax / payPeriodsPerYear;
// — Step 4: Calculate Estimated Federal Income Tax —
var federalTax = 0;
var federalStandardDeduction;
var federalAllowanceValue = 4700; // Simplified value per allowance for calculation (historical proxy)
if (federalFilingStatus === 'single') {
federalStandardDeduction = 13850; // 2023/2024 approx
} else { // Married Filing Jointly
federalStandardDeduction = 27700; // 2023/2024 approx
}
// Calculate taxable income for federal withholding
var federalTaxableIncome = annualTaxableGrossPay – federalStandardDeduction – (federalAllowances * federalAllowanceValue);
if (federalTaxableIncome < 0) federalTaxableIncome = 0;
// Simplified Federal Tax Brackets (2023/2024 approx)
if (federalFilingStatus === 'single') {
if (federalTaxableIncome <= 11600) {
federalTax = federalTaxableIncome * 0.10;
} else if (federalTaxableIncome <= 47150) {
federalTax = 11600 * 0.10 + (federalTaxableIncome – 11600) * 0.12;
} else if (federalTaxableIncome <= 100525) {
federalTax = 11600 * 0.10 + (47150 – 11600) * 0.12 + (federalTaxableIncome – 47150) * 0.22;
} else if (federalTaxableIncome <= 191950) {
federalTax = 11600 * 0.10 + (47150 – 11600) * 0.12 + (100525 – 47150) * 0.22 + (federalTaxableIncome – 100525) * 0.24;
} else { // Simplified upper bracket
federalTax = 11600 * 0.10 + (47150 – 11600) * 0.12 + (100525 – 47150) * 0.22 + (191950 – 100525) * 0.24 + (federalTaxableIncome – 191950) * 0.32;
}
} else { // Married Filing Jointly
if (federalTaxableIncome <= 23200) {
federalTax = federalTaxableIncome * 0.10;
} else if (federalTaxableIncome <= 94300) {
federalTax = 23200 * 0.10 + (federalTaxableIncome – 23200) * 0.12;
} else if (federalTaxableIncome <= 201050) {
federalTax = 23200 * 0.10 + (94300 – 23200) * 0.12 + (federalTaxableIncome – 94300) * 0.22;
} else if (federalTaxableIncome <= 383900) {
federalTax = 23200 * 0.10 + (94300 – 23200) * 0.12 + (201050 – 94300) * 0.22 + (federalTaxableIncome – 201050) * 0.24;
} else { // Simplified upper bracket
federalTax = 23200 * 0.10 + (94300 – 23200) * 0.12 + (201050 – 94300) * 0.22 + (383900 – 201050) * 0.24 + (federalTaxableIncome – 383900) * 0.32;
}
}
var federalTaxPerPeriod = federalTax / payPeriodsPerYear;
// — Step 5: Calculate Estimated State Income Tax —
var stateTax = 0;
var stateAllowanceValue = 1000; // Simplified value per state allowance
if (state === 'california') {
var caTaxableIncome = annualTaxableGrossPay – (stateAllowances * stateAllowanceValue);
if (caTaxableIncome < 0) caTaxableIncome = 0;
if (federalFilingStatus === 'single') { // CA Single Brackets (simplified)
if (caTaxableIncome <= 10000) {
stateTax = caTaxableIncome * 0.01;
} else if (caTaxableIncome <= 20000) {
stateTax = 10000 * 0.01 + (caTaxableIncome – 10000) * 0.02;
} else if (caTaxableIncome <= 30000) {
stateTax = 10000 * 0.01 + 10000 * 0.02 + (caTaxableIncome – 20000) * 0.04;
} else if (caTaxableIncome <= 40000) {
stateTax = 10000 * 0.01 + 10000 * 0.02 + 10000 * 0.04 + (caTaxableIncome – 30000) * 0.06;
} else {
stateTax = 10000 * 0.01 + 10000 * 0.02 + 10000 * 0.04 + 10000 * 0.06 + (caTaxableIncome – 40000) * 0.08;
}
} else { // CA Married Filing Jointly Brackets (simplified)
if (caTaxableIncome <= 20000) {
stateTax = caTaxableIncome * 0.01;
} else if (caTaxableIncome <= 40000) {
stateTax = 20000 * 0.01 + (caTaxableIncome – 20000) * 0.02;
} else if (caTaxableIncome <= 60000) {
stateTax = 20000 * 0.01 + 20000 * 0.02 + (caTaxableIncome – 40000) * 0.04;
} else if (caTaxableIncome <= 80000) {
stateTax = 20000 * 0.01 + 20000 * 0.02 + 20000 * 0.04 + (caTaxableIncome – 60000) * 0.06;
} else {
stateTax = 20000 * 0.01 + 20000 * 0.02 + 20000 * 0.04 + 20000 * 0.06 + (caTaxableIncome – 80000) * 0.08;
}
}
} else if (state === 'new_york') {
var nyTaxableIncome = annualTaxableGrossPay – (stateAllowances * stateAllowanceValue);
if (nyTaxableIncome < 0) nyTaxableIncome = 0;
if (federalFilingStatus === 'single') { // NY Single Brackets (simplified)
if (nyTaxableIncome <= 8500) {
stateTax = nyTaxableIncome * 0.04;
} else if (nyTaxableIncome <= 11700) {
stateTax = 8500 * 0.04 + (nyTaxableIncome – 8500) * 0.045;
} else if (nyTaxableIncome <= 13900) {
stateTax = 8500 * 0.04 + (11700 – 8500) * 0.045 + (nyTaxableIncome – 11700) * 0.0525;
} else if (nyTaxableIncome <= 21400) {
stateTax = 8500 * 0.04 + (11700 – 8500) * 0.045 + (13900 – 11700) * 0.0525 + (nyTaxableIncome – 13900) * 0.059;
} else {
stateTax = 8500 * 0.04 + (11700 – 8500) * 0.045 + (13900 – 11700) * 0.0525 + (21400 – 13900) * 0.059 + (nyTaxableIncome – 21400) * 0.065;
}
} else { // NY Married Filing Jointly Brackets (simplified)
if (nyTaxableIncome <= 17000) {
stateTax = nyTaxableIncome * 0.04;
} else if (nyTaxableIncome <= 23400) {
stateTax = 17000 * 0.04 + (nyTaxableIncome – 17000) * 0.045;
} else if (nyTaxableIncome <= 27800) {
stateTax = 17000 * 0.04 + (23400 – 17000) * 0.045 + (nyTaxableIncome – 23400) * 0.0525;
} else if (nyTaxableIncome <= 42800) {
stateTax = 17000 * 0.04 + (23400 – 17000) * 0.045 + (27800 – 23400) * 0.0525 + (nyTaxableIncome – 27800) * 0.059;
} else {
stateTax = 17000 * 0.04 + (23400 – 17000) * 0.045 + (27800 – 23400) * 0.0525 + (42800 – 27800) * 0.059 + (nyTaxableIncome – 42800) * 0.065;
}
}
} else if (state === 'pennsylvania') {
stateTax = annualTaxableGrossPay * 0.0307; // Flat rate
}
// For 'none', stateTax remains 0
var stateTaxPerPeriod = stateTax / payPeriodsPerYear;
// — Step 6: Calculate Net Pay —
var totalDeductionsPerPeriod = preTaxDeductions + socialSecurityTaxPerPeriod + medicareTaxPerPeriod + federalTaxPerPeriod + stateTaxPerPeriod + postTaxDeductions;
var netPayPerPeriod = grossPayPerPeriod – totalDeductionsPerPeriod;
// Display results
document.getElementById('grossPayResult').innerText = '$' + grossPayPerPeriod.toFixed(2);
document.getElementById('preTaxDeductionsResult').innerText = '$' + preTaxDeductions.toFixed(2);
document.getElementById('taxableGrossPayResult').innerText = '$' + taxableGrossPayPerPeriod.toFixed(2);
document.getElementById('socialSecurityTaxResult').innerText = '$' + socialSecurityTaxPerPeriod.toFixed(2);
document.getElementById('MedicareTaxResult').innerText = '$' + medicareTaxPerPeriod.toFixed(2);
document.getElementById('federalTaxResult').innerText = '$' + federalTaxPerPeriod.toFixed(2);
document.getElementById('stateTaxResult').innerText = '$' + stateTaxPerPeriod.toFixed(2);
document.getElementById('postTaxDeductionsResult').innerText = '$' + postTaxDeductions.toFixed(2);
document.getElementById('netPayResult').innerText = '$' + netPayPerPeriod.toFixed(2);
}
// Initial call to set up state allowances visibility
document.getElementById('state').onchange();
.adp-payroll-calculator {
font-family: Arial, sans-serif;
max-width: 700px;
margin: 20px auto;
padding: 20px;
border: 1px solid #ccc;
border-radius: 8px;
background-color: #f9f9f9;
}
.adp-payroll-calculator h2, .adp-payroll-calculator h3 {
color: #333;
text-align: center;
margin-bottom: 15px;
}
.adp-payroll-calculator p {
margin-bottom: 10px;
line-height: 1.6;
}
.calculator-inputs label {
display: inline-block;
width: 220px;
margin-bottom: 8px;
font-weight: bold;
}
.calculator-inputs input[type="number"],
.calculator-inputs select {
width: calc(100% – 230px);
padding: 8px;
margin-bottom: 8px;
border: 1px solid #ddd;
border-radius: 4px;
box-sizing: border-box;
}
.calculator-inputs button {
display: block;
width: 100%;
padding: 10px 15px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
font-size: 16px;
cursor: pointer;
margin-top: 20px;
}
.calculator-inputs button:hover {
background-color: #0056b3;
}
.calculator-results {
margin-top: 30px;
padding-top: 20px;
border-top: 1px solid #eee;
}
.calculator-results p {
font-size: 1.1em;
margin-bottom: 10px;
}
.calculator-results p strong {
color: #555;
}
.calculator-results span {
float: right;
font-weight: bold;
color: #007bff;
}
.calculator-results p:after {
content: "";
display: table;
clear: both;
}
#stateAllowancesContainer {
margin-top: 10px;
padding-left: 20px;
border-left: 3px solid #007bff;
background-color: #e7f3ff;
padding-top: 10px;
padding-bottom: 2px;
margin-bottom: 10px;
}
#stateAllowancesContainer label {
width: 180px; /* Adjust for nested label */
}
#stateAllowancesContainer input {
width: calc(100% – 190px); /* Adjust for nested input */
}
Understanding Your Hourly Paycheck with an ADP Payroll Calculator
For hourly employees, understanding how your gross earnings translate into your net take-home pay can sometimes feel like solving a complex puzzle. An ADP payroll calculator, like the one above, helps demystify this process by estimating your paycheck breakdown, accounting for various taxes and deductions.
What is Gross Pay?
Your Gross Pay is the total amount of money you earn before any deductions are taken out. For hourly employees, this is calculated by multiplying your hourly wage by the number of hours you work in a pay period. If you work overtime, your gross pay will also include your overtime earnings, typically calculated at 1.5 times your regular hourly rate for hours exceeding 40 in a workweek (though this calculator simplifies by assuming regular hours).
Formula: Hourly Wage × Hours Worked per Week × Weeks per Pay Period
Key Deductions from Your Paycheck
Once your gross pay is determined, several deductions are typically subtracted. These fall into two main categories: mandatory deductions (taxes) and voluntary deductions (benefits, retirement contributions).
1. Pre-tax Deductions
These are deductions taken from your gross pay before taxes are calculated. This means they reduce your taxable income, potentially lowering the amount of federal and state income tax you owe. Common pre-tax deductions include:
- Health Insurance Premiums: Your share of the cost for medical, dental, or vision insurance.
- 401(k) or 403(b) Contributions: Money you contribute to a retirement plan.
- Flexible Spending Accounts (FSAs) or Health Savings Accounts (HSAs): Funds set aside for healthcare or dependent care expenses.
2. FICA Taxes (Social Security and Medicare)
The Federal Insurance Contributions Act (FICA) mandates contributions to Social Security and Medicare. These are federal taxes that fund retirement, disability, and healthcare benefits.
- Social Security Tax: As an employee, you typically pay 6.2% of your gross wages up to an annual earnings limit (e.g., $168,600 for 2024). Your employer also pays an equal amount.
- Medicare Tax: You pay 1.45% of all your gross wages, with no earnings limit. Your employer also pays an equal amount.
3. Federal Income Tax
This is a progressive tax levied by the U.S. government on your taxable income. The amount withheld from your paycheck depends on several factors, including your filing status (Single, Married Filing Jointly, etc.), the number of dependents you claim, and any additional withholding you request on your W-4 form. Our calculator uses a simplified allowance system to estimate this, but actual withholding can vary based on the latest IRS guidelines.
4. State Income Tax
Most states also levy an income tax, though some (like Texas, Florida, Nevada, Washington, Wyoming, South Dakota, Alaska, and New Hampshire on earned income) do not. State income tax rates and rules vary significantly by state, with some having flat rates and others using progressive brackets similar to federal tax. Our calculator includes simplified estimates for a few common states.
5. Post-tax Deductions
These deductions are taken out of your pay after all applicable taxes have been calculated and withheld. They do not reduce your taxable income. Examples include:
- Roth 401(k) Contributions: Retirement contributions made with after-tax dollars.
- Garnishments: Court-ordered deductions for debts like child support or unpaid taxes.
- Union Dues: Fees paid to a labor union.
- Charitable Contributions: Donations made directly from your paycheck.
Calculating Your Net Pay
Your Net Pay, or take-home pay, is what's left after all pre-tax deductions, FICA taxes, federal income tax, state income tax, and post-tax deductions have been subtracted from your gross pay.
Formula: Gross Pay – Pre-tax Deductions – FICA Taxes – Federal Income Tax – State Income Tax – Post-tax Deductions = Net Pay
Why Use This Calculator?
While this calculator provides a helpful estimate, it's important to remember that actual payroll calculations can be more complex due to specific state and local tax laws, additional deductions, and the precise withholding methods used by your employer's payroll system (like ADP). However, it serves as an excellent tool for:
- Budgeting and financial planning.
- Understanding the impact of raises or changes in hours.
- Estimating how different deductions (like increasing 401(k) contributions) affect your take-home pay.
Always refer to your official pay stubs for exact figures and consult with a tax professional for personalized advice.