Second stimulus payment calculator



The second stimulus payment for US residents was signed yesterday. I read a bunch of articles online to figure out how much I would receive, but found them rather confusing.

I ended up writing my own calculator. It looks ugly, but it's simple and it works. Here's how it works (full code and the code in action are below):
Lines [1-18] are the HTML page: [4-11] a form for the 'filing status' with three radio buttons
[12] a text input for the income
[14] a text input for the number of dependents
I decided to use text inputs because I didn't like the arrows on standard 'number' inputs
[17] a label to display the result
[18] a button to re-trigger the calculation

[19-42] is the JavaScript part:
[20-23] Assign the HTML DOM elements to the JS variables
[24-41] The main (and only) function that does the calculation:
[25-31] Find which radio button is checked
[32] Headcount of taxpayers eligible based on the filing status (2 for married, 1 otherwise)
[33] The dollar limits corresponding to the filing status.
If your income is above these limits, your payment will be reduced.
[34-35] convert user input to number. This takes care of situations where the input is blank or contains a letter by mistake.
[36] The initial estimate assumes $600 per taxpayer plus $600 per dependent.
[37] calculate the amount by which the income exceeded the limit
[38] calculate the reduction amount ($5 reduction per $100 of amountOverLimit)
[39] The final estimate = estimate - reduction (or zero, whichever is greater)
[40] display the estimate




<html>
<body>
Select your filing status:<br>
<form>
<input type="radio" name="filingStatus" value=0 checked="true">
single<br>
<input type="radio" name="filingStatus" value=1>
married<br>
<input type="radio" name="filingStatus" value=2>
head of household<br>
</form>
Enter your 2019 income here: <input type="text" id="incomeInput">
<br>
Enter the number of your dependents below the age of 17 here: <input type="text" id="dependentsInput">
<br>
<br>
<label id="estimateLabel"></label><br>
<button id="recalculateButton">Click here to recalculate</button>
<script>
const incomeInput = document.getElementById('incomeInput');
const dependentsInput = document.getElementById('dependentsInput');
const estimateLabel = document.getElementById('estimateLabel');
const recalculateButton = document.getElementById('recalculateButton');
recalculateButton.onclick = function() {
  let selectedValue = 0;
  const radioButtons = document.querySelectorAll('input[name="filingStatus"]');
  for (const radioButton of radioButtons) {
    if (radioButton.checked) {
      selectedValue = radioButton.value;
    }
  }
  const headcount = [1, 2, 1];
  const limit = [75000, 150000, 112500];
  let income = Number(incomeInput.value);
  let dependents = Number(dependentsInput.value);
  let estimate = 600 * (headcount[selectedValue] + dependents);
  let amountOverLimit = Math.max(0, income - limit[selectedValue]);
  let reductionAmount = amountOverLimit * .05;
  let finalEstimate = Math.max(0, estimate - reductionAmount);
  estimateLabel.innerText = "You are likely to receive: " + finalEstimate;
};
</script>
</body>
</html>


And finally this is how it actually works.

For income, enter your AGI (Adjusted Gross Income - from field 8b of your last form 1040), without commas.

Select your filing status:
single
married
head of household
Enter your 2019 income here:
Enter the number of your dependents below the age of 17 here:





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