Series EE Bond Value Calculator
Calculation Results:
Enter details and click "Calculate Bond Value" to see results.
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function calculateBondValue() {
var faceValue = parseFloat(document.getElementById('faceValue').value);
var purchaseMonth = parseInt(document.getElementById('purchaseMonth').value);
var purchaseYear = parseInt(document.getElementById('purchaseYear').value);
var fixedRate = parseFloat(document.getElementById('fixedRate').value) / 100; // Convert percentage to decimal
var calcMonth = parseInt(document.getElementById('calcMonth').value);
var calcYear = parseInt(document.getElementById('calcYear').value);
var resultDiv = document.getElementById('result');
resultDiv.innerHTML = "; // Clear previous results
// Input validation
if (isNaN(faceValue) || faceValue <= 0 || faceValue % 50 !== 0) {
resultDiv.innerHTML = 'Please enter a valid Bond Face Value (must be a multiple of 50 and greater than 0).';
return;
}
if (isNaN(purchaseYear) || purchaseYear new Date().getFullYear()) {
resultDiv.innerHTML = 'Please enter a valid Bond Purchase Year (e.g., 2000, not in the future).';
return;
}
if (isNaN(fixedRate) || fixedRate < 0) {
resultDiv.innerHTML = 'Please enter a valid Fixed Annual Interest Rate (e.g., 0.1 for 0.1%).';
return;
}
if (isNaN(calcYear) || calcYear < purchaseYear) {
resultDiv.innerHTML = 'Please enter a valid Calculation Year (cannot be before purchase year).';
return;
}
var purchaseDate = new Date(purchaseYear, purchaseMonth – 1, 1);
var calculationDate = new Date(calcYear, calcMonth – 1, 1);
if (calculationDate < purchaseDate) {
resultDiv.innerHTML = 'Calculation Date cannot be before Purchase Date.';
return;
}
var initialInvestment = faceValue / 2;
var annualRate = fixedRate; // Already converted to decimal
// Calculate total months held
var diffMonths = (calculationDate.getFullYear() – purchaseDate.getFullYear()) * 12 + (calculationDate.getMonth() – purchaseDate.getMonth());
// Cap at 30 years (360 months) for interest accrual
var effectiveDiffMonths = Math.min(diffMonths, 360);
var yearsHeld = effectiveDiffMonths / 12; // Years for calculation
var compoundingPeriods = Math.floor(effectiveDiffMonths / 6);
var currentValue = initialInvestment;
var valueAt20YearsFixedRate = 0;
var guaranteedValueAt20Years = 0;
if (yearsHeld 20
// Calculate value at exactly 20 years based on fixed rate
valueAt20YearsFixedRate = initialInvestment * Math.pow((1 + annualRate / 2), (2 * 20));
// Apply 20-year doubling guarantee
guaranteedValueAt20Years = Math.max(valueAt20YearsFixedRate, faceValue);
// If the effective duration is exactly 20 years (240 months)
if (effectiveDiffMonths === 240) {
currentValue = guaranteedValueAt20Years;
} else {
// Calculate remaining periods after 20 years, up to 30 years total
var remainingMonthsAfter20Years = effectiveDiffMonths – (20 * 12);
var remainingCompoundingPeriods = Math.floor(remainingMonthsAfter20Years / 6);
currentValue = guaranteedValueAt20Years * Math.pow((1 + annualRate / 2), remainingCompoundingPeriods);
}
}
// Format results
var formattedPurchasePrice = initialInvestment.toLocaleString('en-US', { style: 'currency', currency: 'USD' });
var formattedCurrentValue = currentValue.toLocaleString('en-US', { style: 'currency', currency: 'USD' });
var totalInterestEarned = currentValue – initialInvestment;
var formattedInterestEarned = totalInterestEarned.toLocaleString('en-US', { style: 'currency', currency: 'USD' });
var displayYearsHeld = diffMonths / 12; // Display actual years held, not capped for calculation
var displayMaturityDate20 = new Date(purchaseDate.getFullYear() + 20, purchaseDate.getMonth(), 1);
var displayMaturityDate30 = new Date(purchaseDate.getFullYear() + 30, purchaseDate.getMonth(), 1);
resultDiv.innerHTML =
'
Bond Purchase Price: ' + formattedPurchasePrice + " +
'
Years Held (as of ' + calculationDate.toLocaleDateString('en-US', { month: 'long', year: 'numeric' }) + '): ' + displayYearsHeld.toFixed(2) + ' years' +
'
Current Estimated Value: ' + formattedCurrentValue + " +
'
Total Interest Earned: ' + formattedInterestEarned + " +
'
20-Year Doubling Guarantee Date: ' + displayMaturityDate20.toLocaleDateString('en-US', { month: 'long', year: 'numeric' }) + " +
'
Final Maturity Date (30 years): ' + displayMaturityDate30.toLocaleDateString('en-US', { month: 'long', year: 'numeric' }) + ";
if (diffMonths > 360) {
resultDiv.innerHTML += '
Note: Series EE bonds stop earning interest after 30 years. The value shown is capped at the 30-year maturity value.';
}
}
// Set default calculation month/year to current month/year
window.onload = function() {
var today = new Date();
document.getElementById('calcMonth').value = today.getMonth() + 1;
document.getElementById('calcYear').value = today.getFullYear();
};
Understanding Series EE Savings Bonds
Series EE savings bonds are a type of low-risk, long-term investment issued by the U.S. Treasury. They are designed to help individuals save money and are often purchased as gifts or for future goals like education or retirement. Understanding how these bonds accrue interest and mature is key to maximizing their value.
How Series EE Bonds Work
- Purchase Price: Series EE bonds are purchased at half their face value. For example, a $1,000 face value bond costs $500 to buy.
- Fixed Interest Rate: Bonds purchased on or after May 1, 2005, earn a fixed interest rate for their entire life. This rate is set at the time of purchase and does not change. Interest accrues monthly and is compounded semiannually.
- 20-Year Doubling Guarantee: A significant feature of Series EE bonds is their guarantee to double in value after 20 years. This means that if you hold a bond for 20 years, its value will be at least its face value. If the fixed interest rate alone doesn't achieve this doubling, the Treasury makes a one-time adjustment at the 20-year mark to bring its value up to the face value. If the fixed rate would have yielded more than the face value, that higher value is retained.
- 30-Year Maturity: Series EE bonds continue to earn interest for a total of 30 years from their issue date. After 30 years, they stop earning interest, and their value becomes fixed.
- Tax Advantages: Interest earned on Series EE bonds is exempt from state and local income taxes. Federal income tax on the interest can be deferred until the bond is cashed or reaches final maturity. Furthermore, if the bond proceeds are used to pay for qualified higher education expenses, the interest may be entirely tax-free at the federal level.
Using the Series EE Bond Value Calculator
Our Series EE Bond Value Calculator helps you estimate the current worth of your bonds based on their purchase details and the fixed interest rate. Here's how to use it:
- Bond Face Value: Enter the face value printed on your bond (e.g., $1,000). Remember, you paid half of this amount.
- Bond Purchase Month and Year: Select the month and year your bond was issued. This is crucial for determining the bond's age and compounding periods.
- Fixed Annual Interest Rate (%): Input the fixed annual interest rate your bond earns. This rate is typically printed on your bond or can be found on the TreasuryDirect website based on your purchase date.
- Calculate Value As Of Month and Year: Choose the month and year for which you want to calculate the bond's value. This can be today's date or a future date to project its growth.
- Click "Calculate Bond Value": The calculator will then display the bond's original purchase price, its estimated current value, the total interest earned, and its 20-year doubling guarantee and 30-year final maturity dates.
Example Calculation:
Let's say you purchased a $1,000 face value Series EE bond in January 2000 with a fixed annual interest rate of 0.1%. You want to know its value as of January 2024.
- Bond Purchase Price: $500
- Years Held: 24 years
- At 20 years (January 2020): Due to the doubling guarantee, the bond's value would be $1,000, as the fixed rate alone would not have achieved this.
- From January 2020 to January 2024 (4 years): The bond continues to earn interest on its $1,000 value at the 0.1% fixed rate, compounded semiannually.
- Estimated Current Value (January 2024): Approximately $1,004.01
- Total Interest Earned: Approximately $504.01
Use this calculator to track the growth of your Series EE bonds and plan for their maturity!