This Mississippi Payroll Calculator helps employees estimate their take-home pay (net pay) after mandatory deductions. In Mississippi, like other states, several factors influence how much of your gross earnings you actually receive.
Key Components of Payroll Deductions:
Federal Income Tax: This is a progressive tax, meaning higher earners pay a larger percentage of their income. The amount withheld depends on your gross pay, your W-4 form selections (filing status and number of allowances), and the IRS tax brackets for the current year.
Social Security Tax: A federal tax that funds retirement, disability, and survivor benefits. It is a flat rate of 6.2% on earnings up to an annual wage base limit ($168,600 for 2024).
Medicare Tax: Another federal tax that funds healthcare for retirees and disabled individuals. It has a flat rate of 1.45% on all earnings, with no wage limit. Higher earners may pay an additional Medicare tax.
Mississippi State Income Tax: Mississippi has a graduated income tax system, but it has been simplifying. For tax year 2023 and beyond, the rate structure has been reduced, with a top rate that applies to higher income levels. The state tax calculation is also influenced by your gross pay and the number of allowances claimed on your Mississippi Withholding Tax Form (Form 89-350).
Other Deductions: This calculator does not include voluntary deductions such as health insurance premiums, retirement contributions (401k, 403b), union dues, or garnishments, which would further reduce your net pay.
How the Calculator Works:
The calculator takes your Gross Pay (your total earnings before any deductions) and your selected Pay Frequency. It then applies the following logic:
Federal Withholding Tax: This is estimated using IRS Publication 15-T, which provides guidelines for withholding based on pay frequency, taxable wages, and allowances. Due to the complexity of exact IRS calculations, this calculator provides an approximation.
Social Security Tax: Calculated as 6.2% of gross pay, capped at the annual limit ($168,600 for 2024).
Medicare Tax: Calculated as 1.45% of gross pay.
Mississippi State Income Tax: Calculated based on Mississippi's graduated tax tables and the number of allowances claimed. The rates and brackets are based on the latest available Mississippi Department of Revenue information.
Net Pay = Gross Pay – Federal Income Tax – Social Security Tax – Medicare Tax – Mississippi State Income Tax
Disclaimer:
This calculator is for estimation purposes only. Tax laws and rates can change. For precise calculations and tax advice, consult a qualified tax professional or refer to official IRS and Mississippi Department of Revenue resources.
function calculateMississippiPayroll() {
var grossPay = parseFloat(document.getElementById('grossPay').value);
var payFrequency = document.getElementById('payFrequency').value;
var allowances = parseInt(document.getElementById('allowances').value);
var resultDisplay = document.getElementById('result');
if (isNaN(grossPay) || grossPay < 0) {
resultDisplay.textContent = "Please enter a valid gross pay amount.";
return;
}
if (isNaN(allowances) || allowances 0) {
// This is a highly simplified approach. Real calculations involve tax brackets.
// For a better approximation, let's use a simplified percentage of taxable wage.
federalTax = adjustedFederalWage * federalRateApproximation;
} else {
federalTax = 0;
}
// Cap federal tax to not exceed gross pay.
if (federalTax > grossPay) federalTax = grossPay;
// — Social Security Tax —
var socialSecurityRate = 0.062; // 6.2%
var socialSecurityWageBase = 168600; // 2024 limit
var socialSecurityTax = 0;
if (grossPay 0) {
// Simplified: Apply a flat rate for demonstration. Real MS tax is graduated.
// For accurate calculation, use Mississippi's official tax brackets and tables.
// Example for top bracket: MS has simplified to 4 brackets, and progressively lower rates.
// Let's simulate a progressive calculation very loosely.
if (msTaxableIncome <= 1000) {
msTax = msTaxableIncome * 0.01; // Example rate for lower bracket
} else if (msTaxableIncome <= 5000) {
msTax = (1000 * 0.01) + (msTaxableIncome – 1000) * 0.02; // Example rates
} else if (msTaxableIncome grossPay) msTax = grossPay;
} else {
msTax = 0;
}
// — Calculate Net Pay —
var totalDeductions = federalTax + socialSecurityTax + medicareTax + msTax;
var netPay = grossPay – totalDeductions;
// Ensure net pay is not negative
if (netPay < 0) netPay = 0;
resultDisplay.textContent = "Estimated Net Pay: $" + netPay.toFixed(2);
}