Paycheck Calculator for Massachusetts

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Massachusetts Paycheck Calculator

Estimate your take-home pay in MA

Your Paycheck Details

Enter your gross annual salary before taxes.
Weekly (52 pay periods/year) Bi-Weekly (26 pay periods/year) Semi-Monthly (24 pay periods/year) Monthly (12 pay periods/year) How often do you get paid?
Enter your pre-tax 401(k) contribution as a percentage.
Enter your total monthly cost for health insurance.
Include things like FSA, HSA, etc. (monthly total).

Your Estimated Net Paycheck

$0.00

Key Breakdown:

Gross Pay per Period: $0.00
Total Pre-Tax Deductions: $0.00
Taxable Income: $0.00
Federal Income Tax: $0.00
Social Security Tax: $0.00
Medicare Tax: $0.00
Massachusetts State Tax: $0.00
Net Pay: $0.00

Assumptions:

Pay Frequency: N/A
401(k) Contribution: N/A
Health Insurance: N/A
Other Pre-Tax Deductions: N/A
How it's Calculated:

1. Gross Pay per Period: Annual Salary divided by the number of pay periods per year. 2. Total Pre-Tax Deductions: Sum of 401(k) contributions, health insurance premiums, and other pre-tax deductions, adjusted for the current pay period. 3. Taxable Income: Gross Pay per Period minus Total Pre-Tax Deductions. 4. Federal Income Tax: Calculated based on Taxable Income using IRS tax brackets (simplified for this calculator). 5. Social Security Tax: 6.2% of gross pay up to the annual limit ($168,600 for 2024). 6. Medicare Tax: 1.45% of gross pay (no income limit). 7. Massachusetts State Tax: Flat rate of 5.00% on taxable income (after standard/itemized deductions, simplified here). 8. Net Pay: Gross Pay per Period minus all taxes and deductions.

Paycheck Breakdown Table

Detailed Paycheck Calculation
Category Amount
Gross Pay $0.00
401(k) Contribution $0.00
Health Insurance $0.00
Other Pre-Tax Deductions $0.00
Taxable Income $0.00
Federal Income Tax $0.00
Social Security Tax $0.00
Medicare Tax $0.00
MA State Tax $0.00
Net Pay $0.00

Tax Allocation Chart

Federal Tax MA State Tax Social Security Medicare

What is a Massachusetts Paycheck Calculator?

A Massachusetts paycheck calculator is a specialized online tool designed to help employees in the Commonwealth estimate their net take-home pay after all mandatory deductions and taxes are accounted for. Unlike generic payroll calculators, this tool incorporates Massachusetts-specific tax rates and rules, providing a more accurate picture of your earnings. It takes your gross salary and subtracts federal income tax, state income tax, Social Security tax, Medicare tax, and any voluntary deductions like 401(k) contributions or health insurance premiums.

Who should use it? Anyone employed in Massachusetts, whether full-time, part-time, or contract-based, can benefit from using this calculator. It's particularly useful for new residents trying to understand their local tax burden, employees negotiating salaries, or individuals planning their personal budgets. It helps demystify the deductions that appear on your pay stub.

Common misconceptions about paychecks include assuming all deductions are mandatory (many are voluntary) or that the tax system is overly complex to understand. While taxes have nuances, tools like this calculator simplify the process, showing the direct impact of different deductions and tax rates on your final pay. Another misconception is that the state income tax is progressive; Massachusetts has a flat income tax rate.

Massachusetts Paycheck Calculator Formula and Mathematical Explanation

The calculation involves several steps, starting with gross pay and progressively subtracting deductions and taxes. Here's a breakdown:

  1. Gross Pay per Pay Period: This is your total earnings before any deductions.
    Formula: `Gross Pay per Period = Annual Salary / Pay Periods per Year`
  2. Total Pre-Tax Deductions: These reduce your taxable income.
    401(k) Deduction: `(Annual Salary * (401k Percentage / 100)) / Pay Periods per Year`
    Health Insurance Deduction: `Monthly Health Insurance Premiums / (12 / Pay Periods per Year)` (Adjusted to per-period cost)
    Other Pre-Tax Deductions: `Monthly Other Deductions / (12 / Pay Periods per Year)` (Adjusted to per-period cost)
    Total Pre-Tax Deductions = 401(k) Deduction + Health Insurance Deduction + Other Pre-Tax Deductions
  3. Taxable Income: This is the amount subject to income taxes.
    Formula: `Taxable Income = Gross Pay per Period – Total Pre-Tax Deductions`
  4. Federal Income Tax: Calculated based on federal tax brackets. For simplicity, this calculator uses a flat rate approximation or a simplified progressive calculation. (Note: Actual federal tax calculation is complex, involving W-4 allowances, tax credits, etc. This calculator provides an estimate.)
    Simplified Formula Example: `Federal Income Tax = Taxable Income * Federal Tax Rate` (Rate varies by income bracket)
  5. Social Security Tax: A fixed percentage up to a wage base limit.
    Formula: `Social Security Tax = MIN(Gross Pay per Period, Social Security Wage Base Limit / Pay Periods per Year) * 0.062`
    (For 2024, the wage base limit is $168,600)
  6. Medicare Tax: A fixed percentage with no wage limit.
    Formula: `Medicare Tax = Gross Pay per Period * 0.0145`
  7. Massachusetts State Tax: Massachusetts has a flat income tax rate.
    Formula: `MA State Tax = Taxable Income * 0.05` (5.00% flat rate)
  8. Net Pay: Your final take-home amount.
    Formula: `Net Pay = Gross Pay per Period – Federal Income Tax – Social Security Tax – Medicare Tax – MA State Tax`

Variables Table

Variables Used in Calculation
Variable Meaning Unit Typical Range/Notes
Annual Salary Gross income before any deductions. USD e.g., $40,000 – $200,000+
Pay Periods per Year How many times an employee is paid within a year. Count 12 (Monthly), 24 (Semi-Monthly), 26 (Bi-Weekly), 52 (Weekly)
401(k) Percentage Percentage of gross salary contributed to a pre-tax 401(k). % 0% – 50% (subject to IRS limits)
Health Insurance Premiums Monthly cost of health insurance coverage paid by the employee. USD e.g., $0 – $1,000+
Other Pre-Tax Deductions Monthly contributions to accounts like FSA, HSA, etc. USD e.g., $0 – $500+
Federal Tax Rate Progressive tax rates set by the IRS. Simplified here. % Varies by income bracket (e.g., 10% to 37%)
Social Security Tax Rate Fixed rate for Social Security contributions. % 6.2% (up to wage limit)
Medicare Tax Rate Fixed rate for Medicare contributions. % 1.45% (no wage limit)
MA State Tax Rate Flat income tax rate in Massachusetts. % 5.00%

Practical Examples (Real-World Use Cases)

Let's illustrate with two common scenarios:

Example 1: Standard Employee

Scenario: Sarah earns an annual salary of $70,000 and is paid bi-weekly (26 pay periods per year). She contributes 6% to her 401(k) and pays $200 per month for health insurance. She has no other pre-tax deductions.

Inputs:

  • Annual Salary: $70,000
  • Pay Frequency: Bi-Weekly (26)
  • 401(k) Contribution: 6%
  • Health Insurance Premiums: $200/month
  • Other Pre-Tax Deductions: $0

Estimated Outputs (using the calculator):

  • Gross Pay per Period: $2,692.31
  • Total Pre-Tax Deductions: $475.38 ($1,384.62 401k + $461.54 Health Insurance per period)
  • Taxable Income: $2,216.93
  • Federal Income Tax (Estimate): ~$221.69
  • Social Security Tax: ~$166.92 (6.2% of $2,692.31)
  • Medicare Tax: ~$39.04 (1.45% of $2,692.31)
  • MA State Tax: ~$110.85 (5% of $2,216.93)
  • Net Pay: ~$2,153.81

Interpretation: Sarah's bi-weekly paycheck is estimated to be around $2,153.81. This shows how pre-tax deductions like her 401(k) and health insurance significantly reduce her taxable income, lowering her overall tax burden.

Example 2: Higher Earner with Additional Deductions

Scenario: John earns $120,000 annually, paid semi-monthly (24 pay periods). He contributes 10% to his 401(k), pays $400 monthly for family health insurance, and has $100 per month deducted for an FSA (Flexible Spending Account).

Inputs:

  • Annual Salary: $120,000
  • Pay Frequency: Semi-Monthly (24)
  • 401(k) Contribution: 10%
  • Health Insurance Premiums: $400/month
  • Other Pre-Tax Deductions: $100/month (FSA)

Estimated Outputs (using the calculator):

  • Gross Pay per Period: $5,000.00
  • Total Pre-Tax Deductions: $1,066.67 ($500.00 401k + $800.00 Health Insurance + $200.00 FSA per period)
  • Taxable Income: $3,933.33
  • Federal Income Tax (Estimate): ~$393.33
  • Social Security Tax: ~$310.00 (6.2% of $5,000.00)
  • Medicare Tax: ~$72.50 (1.45% of $5,000.00)
  • MA State Tax: ~$196.67 (5% of $3,933.33)
  • Net Pay: ~$3,927.50

Interpretation: John's semi-monthly net pay is estimated at $3,927.50. The combination of his 401(k), health insurance, and FSA significantly reduces his taxable income, leading to lower income tax payments compared to if these were post-tax deductions. This highlights the tax advantages of utilizing pre-tax benefits.

How to Use This Massachusetts Paycheck Calculator

Using the calculator is straightforward. Follow these steps to get your estimated net pay:

  1. Enter Annual Salary: Input your gross annual income before any taxes or deductions.
  2. Select Pay Frequency: Choose how often you receive a paycheck (Weekly, Bi-Weekly, Semi-Monthly, or Monthly). This determines how your annual salary is divided.
  3. Input Pre-Tax Deductions:
    • 401(k) Contribution (%): Enter the percentage of your gross salary you contribute to your 401(k).
    • Health Insurance Premiums (Monthly): Enter the total monthly cost you pay for your health insurance.
    • Other Pre-Tax Deductions (Monthly): Add any other deductions taken out before taxes, such as contributions to an FSA or HSA.
  4. Click "Calculate Net Pay": The calculator will process your inputs and display the results.

How to Read Results:

  • Primary Result (Net Pay): This is the most important figure – your estimated take-home pay per paycheck.
  • Intermediate Values: These show the breakdown of your gross pay into taxable income, various taxes, and deductions. This helps you understand where your money is going.
  • Assumptions: Review these to ensure the calculator is using the correct pay frequency and deduction details you provided.
  • Table & Chart: These offer visual and structured representations of the calculation, reinforcing the breakdown.

Decision-Making Guidance: Use the results to adjust your budget, plan for savings goals, or evaluate the financial impact of potential salary changes or benefit elections. If your calculated net pay is lower than expected, consider if increasing pre-tax contributions (like to a 401(k)) could lower your taxable income and potentially increase your net pay over time, while also boosting your retirement savings. For more detailed tax planning, consult a financial advisor.

Key Factors That Affect Massachusetts Paycheck Results

Several factors significantly influence your net paycheck in Massachusetts:

  1. Gross Salary: This is the foundation. A higher gross salary generally means higher tax amounts, but also potentially a higher net pay if deductions increase proportionally.
  2. Pay Frequency: Being paid weekly versus monthly means smaller paycheck amounts but more frequent payments. This impacts how deductions are spread out per period.
  3. 401(k) Contributions: Increasing your pre-tax 401(k) contribution directly reduces your taxable income, lowering your federal and state income tax liability. This is a powerful way to save for retirement while reducing current taxes.
  4. Health Insurance Premiums: Employee contributions to health insurance are typically pre-tax, meaning they also reduce your taxable income, similar to 401(k) contributions. The higher the premium, the lower your taxable income.
  5. Other Pre-Tax Deductions (FSA/HSA): Contributions to accounts like FSAs (for healthcare or dependent care) or HSAs (Health Savings Accounts) are also usually pre-tax, further decreasing the income subject to income taxes.
  6. Filing Status & Allowances (Federal): While this calculator simplifies federal taxes, your W-4 form (marital status, dependents) affects the amount of federal income tax withheld from each paycheck.
  7. Additional Income/Wages: Income from sources other than your primary salary (e.g., bonuses, commissions, second job) will be added to your gross pay and taxed accordingly.
  8. Tax Law Changes: Federal and state tax laws, including tax rates, brackets, and deduction limits, can change annually, affecting your paycheck. Staying informed is crucial.

Frequently Asked Questions (FAQ)

What is the Massachusetts state income tax rate?

Massachusetts currently has a flat income tax rate of 5.00%. This means the tax rate is the same regardless of your income level, unlike progressive tax systems in some other states.

Does Massachusetts have a Social Security tax?

No, Massachusetts does not have its own state-level Social Security tax. Social Security tax (6.2%) is a federal tax applied to your earnings up to a certain limit ($168,600 in 2024).

Are 401(k) contributions tax-deductible in Massachusetts?

Yes, traditional 401(k) contributions are made on a pre-tax basis. This means they reduce your taxable income for both federal and Massachusetts state income tax purposes.

How do health insurance premiums affect my paycheck?

If your health insurance premiums are deducted from your paycheck on a pre-tax basis (which is common), they reduce the amount of your income that is subject to federal and state income taxes. This lowers your overall tax burden.

What is the difference between gross pay and net pay?

Gross pay is your total earnings before any deductions or taxes are taken out. Net pay, often called "take-home pay," is the amount you actually receive after all deductions and taxes have been subtracted from your gross pay.

Does this calculator account for all possible deductions?

This calculator includes common deductions like 401(k) and health insurance. It may not account for every specific deduction (e.g., union dues, specific professional licenses, certain retirement plans like pensions). For a precise calculation, refer to your official pay stub or consult your HR department.

How accurate is the federal tax calculation?

The federal tax calculation in this calculator is a simplified estimate. Actual federal income tax withholding depends on factors like your W-4 allowances, tax credits, and specific tax bracket details, which can be complex. For exact figures, consult IRS resources or a tax professional.

Can I use this calculator for freelance or contract income?

This calculator is primarily designed for W-2 employees. Freelance or 1099 income has different tax implications (e.g., self-employment tax, estimated quarterly taxes) and is not accurately represented here. You would need a different type of calculator for that.

What happens if my salary changes mid-year?

If your salary changes, you should update the 'Annual Salary' field in the calculator to reflect your new rate. For accurate year-to-date calculations, you would need to recalculate based on the period the new salary is effective.

Related Tools and Internal Resources

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Real federal tax is progressive and complex. var federalTax = 0; var remainingTaxableIncome = taxableIncome; var federalTaxableIncomeForCalc = taxableIncome; // Use this for bracket calculation // Example Brackets (Single Filer – adjust as needed for accuracy) // These are illustrative and may not reflect current IRS brackets precisely. var federalBrackets = [ { limit: 11600, rate: 0.10 }, { limit: 47150, rate: 0.12 }, { limit: 100525, rate: 0.22 }, { limit: 191950, rate: 0.24 }, { limit: 383900, rate: 0.32 }, { limit: 487850, rate: 0.35 }, { limit: Infinity, rate: 0.37 } ]; var currentIncome = federalTaxableIncomeForCalc; var calculatedFederalTax = 0; var previousLimit = 0; for (var i = 0; i < federalBrackets.length; i++) { var bracket = federalBrackets[i]; var taxableInBracket = Math.max(0, Math.min(currentIncome, bracket.limit) – previousLimit); calculatedFederalTax += taxableInBracket * bracket.rate; previousLimit = bracket.limit; if (currentIncome remainingSSLimit && remainingSSLimit > 0) { grossPayForSS = remainingSSLimit; } else if (annualGrossPay <= SOCIAL_SECURITY_WAGE_BASE) { // If annual salary is below limit, use full gross pay for SS grossPayForSS = grossPayPeriod; } else { // If annual salary exceeds limit, and this period's pay is above remaining limit, tax 0 grossPayForSS = 0; } if (grossPayForSS < 0) grossPayForSS = 0; // Ensure non-negative socialSecurityTax = grossPayForSS * SOCIAL_SECURITY_RATE; var medicareTax = grossPayPeriod * MEDICARE_RATE; var massachusettsTax = taxableIncome * MASSACHUSETTS_TAX_RATE; var netPay = grossPayPeriod – federalTax – socialSecurityTax – medicareTax – massachusettsTax; // Update Results Display netPayResultDiv.textContent = formatCurrency(netPay); grossPayPeriodSpan.textContent = formatCurrency(grossPayPeriod); totalPreTaxDeductionsSpan.textContent = formatCurrency(totalPreTaxDeductionsPeriod); taxableIncomeSpan.textContent = formatCurrency(taxableIncome); federalTaxSpan.textContent = formatCurrency(federalTax); socialSecurityTaxSpan.textContent = formatCurrency(socialSecurityTax); medicareTaxSpan.textContent = formatCurrency(medicareTax); massachusettsTaxSpan.textContent = formatCurrency(massachusettsTax); netPaySpan.textContent = formatCurrency(netPay); // Update Table tableGrossPay.textContent = formatCurrency(grossPayPeriod); table401k.textContent = formatCurrency(annual401kContribution / payFrequency); tableHealthInsurance.textContent = formatCurrency(annualHealthInsurance / payFrequency); tableOtherDeductions.textContent = formatCurrency(annualAdditionalDeductions / payFrequency); tableTaxableIncome.textContent = formatCurrency(taxableIncome); tableFederalTax.textContent = formatCurrency(federalTax); tableSocialSecurityTax.textContent = formatCurrency(socialSecurityTax); tableMedicareTax.textContent = formatCurrency(medicareTax); tableMassTax.textContent = formatCurrency(massachusettsTax); tableNetPay.textContent = formatCurrency(netPay); // Update Assumptions var payFrequencyText = document.querySelector('#payFrequency option:checked').text; assumptionPayFrequencySpan.textContent = payFrequencyText; assumption401kSpan.textContent = formatPercentage(preTax401kPercent); assumptionHealthInsuranceSpan.textContent = formatCurrency(healthInsuranceMonthly) + "/month"; assumptionOtherDeductionsSpan.textContent = formatCurrency(additionalDeductionsMonthly) + "/month"; updateChart(federalTax, massachusettsTax, socialSecurityTax, medicareTax); } function clearResults() { netPayResultDiv.textContent = "$0.00"; grossPayPeriodSpan.textContent = "$0.00"; totalPreTaxDeductionsSpan.textContent = "$0.00"; taxableIncomeSpan.textContent = "$0.00"; federalTaxSpan.textContent = "$0.00"; socialSecurityTaxSpan.textContent = "$0.00"; medicareTaxSpan.textContent = "$0.00"; massachusettsTaxSpan.textContent = "$0.00"; netPaySpan.textContent = "$0.00"; tableGrossPay.textContent = "$0.00"; table401k.textContent = "$0.00"; tableHealthInsurance.textContent = "$0.00"; tableOtherDeductions.textContent = "$0.00"; tableTaxableIncome.textContent = "$0.00"; tableFederalTax.textContent = "$0.00"; tableSocialSecurityTax.textContent = "$0.00"; tableMedicareTax.textContent = "$0.00"; tableMassTax.textContent = "$0.00"; tableNetPay.textContent = "$0.00"; assumptionPayFrequencySpan.textContent = "N/A"; assumption401kSpan.textContent = "N/A"; assumptionHealthInsuranceSpan.textContent = "N/A"; assumptionOtherDeductionsSpan.textContent = "N/A"; if (chartInstance) { chartInstance.destroy(); chartInstance = null; } var ctx = chartCanvas.getContext('2d'); ctx.clearRect(0, 0, chartCanvas.width, chartCanvas.height); } function resetCalculator() { annualSalaryInput.value = ''; payFrequencyInput.value = '52'; // Default to Weekly preTax401kInput.value = '0'; healthInsurancePremiumsInput.value = '0'; additionalDeductionsInput.value = '0'; clearResults(); // Optionally trigger calculation after reset if defaults are set // calculatePaycheck(); } function copyResults() { var netPay = netPayResultDiv.textContent; var grossPayPeriod = grossPayPeriodSpan.textContent; var totalPreTaxDeductions = totalPreTaxDeductionsSpan.textContent; var taxableIncome = taxableIncomeSpan.textContent; var federalTax = federalTaxSpan.textContent; var socialSecurityTax = socialSecurityTaxSpan.textContent; var medicareTax = medicareTaxSpan.textContent; var massachusettsTax = massachusettsTaxSpan.textContent; var assumptionPayFrequency = assumptionPayFrequencySpan.textContent; var assumption401k = assumption401kSpan.textContent; var assumptionHealthInsurance = assumptionHealthInsuranceSpan.textContent; var assumptionOtherDeductions = assumptionOtherDeductionsSpan.textContent; var textToCopy = "Massachusetts Paycheck Calculation Results:\n\n"; textToCopy += "Estimated Net Pay: " + netPay + "\n"; textToCopy += "————————————\n"; textToCopy += "Gross Pay per Period: " + grossPayPeriod + "\n"; textToCopy += "Total Pre-Tax Deductions: " + totalPreTaxDeductions + "\n"; textToCopy += "Taxable Income: " + taxableIncome + "\n"; textToCopy += "Federal Income Tax: " + federalTax + "\n"; textToCopy += "Social Security Tax: " + socialSecurityTax + "\n"; textToCopy += "Medicare Tax: " + medicareTax + "\n"; textToCopy += "Massachusetts State Tax: " + massachusettsTax + "\n"; textToCopy += "\nKey Assumptions:\n"; textToCopy += "Pay Frequency: " + assumptionPayFrequency + "\n"; textToCopy += "401(k) Contribution: " + assumption401k + "\n"; textToCopy += "Health Insurance: " + assumptionHealthInsurance + "\n"; textToCopy += "Other Pre-Tax Deductions: " + assumptionOtherDeductions + "\n"; navigator.clipboard.writeText(textToCopy).then(function() { // Optional: Show a confirmation message var copyButton = document.querySelector('button[onclick="copyResults()"]'); var originalText = copyButton.textContent; copyButton.textContent = 'Copied!'; setTimeout(function() { copyButton.textContent = originalText; }, 2000); }).catch(function(err) { console.error('Failed to copy text: ', err); // Fallback for browsers that don't support clipboard API well alert('Could not copy results. Please copy manually.'); }); } function updateChart(federalTax, maTax, ssTax, medicareTax) { var ctx = chartCanvas.getContext('2d'); // Destroy previous chart instance if it exists if (chartInstance) { chartInstance.destroy(); } // Create new chart instance chartInstance = new Chart(ctx, { type: 'pie', // Use pie chart for tax allocation data: { labels: ['Federal Tax', 'MA State Tax', 'Social Security', 'Medicare'], datasets: [{ label: 'Tax Amount', data: [federalTax, maTax, ssTax, medicareTax], backgroundColor: [ 'rgba(255, 99, 132, 0.7)', // Federal Tax (Reddish) 'rgba(54, 162, 235, 0.7)', // MA State Tax (Blue) 'rgba(201, 203, 207, 0.7)', // Social Security (Grey) 'rgba(255, 159, 64, 0.7)' // Medicare (Orange) ], borderColor: [ 'rgba(255, 99, 132, 1)', 'rgba(54, 162, 235, 1)', 'rgba(201, 203, 207, 1)', 'rgba(255, 159, 64, 1)' ], borderWidth: 1 }] }, options: { responsive: true, maintainAspectRatio: false, // Allows chart to fill container width plugins: { legend: { display: false // Legend is handled by custom div }, tooltip: { callbacks: { label: function(context) { var label = context.label || ''; if (label) { label += ': '; } if (context.parsed !== null) { label += formatCurrency(context.parsed); } return label; } } } } } }); } // Function to toggle FAQ answers function toggleFaq(element) { var paragraph = element.nextElementSibling; if (paragraph.style.display === 'block') { paragraph.style.display = 'none'; } else { paragraph.style.display = 'block'; } } // Initial calculation on page load if default values are present document.addEventListener('DOMContentLoaded', function() { // Set default values if inputs are empty on load if (annualSalaryInput.value === '') annualSalaryInput.value = '60000'; // Example default if (preTax401kInput.value === '') preTax401kInput.value = '5'; // Example default if (healthInsurancePremiumsInput.value === '') healthInsurancePremiumsInput.value = '250'; // Example default if (additionalDeductionsInput.value === '') additionalDeductionsInput.value = '0'; // Example default calculatePaycheck(); // Perform initial calculation // Add event listeners for real-time updates annualSalaryInput.addEventListener('input', calculatePaycheck); payFrequencyInput.addEventListener('change', calculatePaycheck); preTax401kInput.addEventListener('input', calculatePaycheck); healthInsurancePremiumsInput.addEventListener('input', calculatePaycheck); additionalDeductionsInput.addEventListener('input', calculatePaycheck); }); // Chart.js library is required for this chart. // Include Chart.js via CDN or local file if not already present. // Example CDN: // For this standalone HTML, we assume Chart.js is available globally. // If running this code directly without Chart.js, the chart will not render. // Ensure Chart.js is loaded before this script or include it in the .

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