From 59179b68f1956c4e6f2da806d34fd3cc2106a27b Mon Sep 17 00:00:00 2001
From: Scott Worley <scottworley@scottworley.com>
Date: Thu, 17 Aug 2023 22:48:49 -0700
Subject: [PATCH] Add Social Security and Medicare taxes

---
 index.html | 15 +++++++++++++++
 tax_ui.js  | 23 ++++++++++++++---------
 2 files changed, 29 insertions(+), 9 deletions(-)

diff --git a/index.html b/index.html
index 68bc084..6702ed3 100644
--- a/index.html
+++ b/index.html
@@ -7,6 +7,7 @@
 <style>
   td { padding: .5em; vertical-align: top}
   textarea { height: 12em; }
+  textarea.small { height: 4em; }
   input { width: 7em }
   .output { padding: 1em; background-color: #eee; border: thin solid #888; width: max-content;  }
   .privacy_policy { margin-top: 5em; }
@@ -52,6 +53,18 @@ State tax table<br/>
 </td>
 </tr>
 <tr>
+<td>
+Social Security tax<br/>
+<textarea id="tax_table_3" class="small" onchange="calculate()" oninput="calculate()">      0  6.2
+ 160200  0</textarea>
+</td>
+<td>
+Medicare tax<br/>
+<textarea id="tax_table_4" class="small" onchange="calculate()" oninput="calculate()">      0  1.45
+ 250000  2.35</textarea>
+</td>
+</tr>
+<tr>
 <td colspan="2">
 Desired after-tax salary</br>
 <input id="after_tax" value="100000" onchange="calculate()" oninput="calculate()">
@@ -63,6 +76,8 @@ Desired after-tax salary</br>
   <strong><span id="before_tax"></span> before tax</strong>
   - <span id="tax_1"></span> federal tax
   - <span id="tax_2"></span> state tax
+  - <span id="tax_3"></span> social security tax
+  - <span id="tax_4"></span> medicare tax
   = <span id="after_tax_verification"></span> after tax.
 </p>
 
diff --git a/tax_ui.js b/tax_ui.js
index 0117dcc..1148f54 100644
--- a/tax_ui.js
+++ b/tax_ui.js
@@ -10,17 +10,22 @@ function format_number(n) {
 }
 
 function calculate() {
-  const table1 = load_tax_table('tax_table_1', 'deductible_1');
-  const table2 = load_tax_table('tax_table_2', 'deductible_2');
+  const tax_tables = [
+    load_tax_table('tax_table_1', 'deductible_1'),
+    load_tax_table('tax_table_2', 'deductible_2'),
+    load_tax_table('tax_table_3'),
+    load_tax_table('tax_table_4')
+  ];
   const after_tax = parseFloat(document.getElementById('after_tax').value);
 
-  const before_tax = invert(merge_tax_tables(table1, table2))(after_tax);
-
-  const tax1 = tax(table1, before_tax);
-  const tax2 = tax(table2, before_tax);
+  const merged_tax_table = tax_tables.reduce(merge_tax_tables);
+  const before_tax = invert(merged_tax_table)(after_tax);
+  const taxes = tax_tables.map(t => tax(t, before_tax));
 
   document.getElementById('before_tax').textContent = format_number(before_tax);
-  document.getElementById('tax_1').textContent = format_number(tax1);
-  document.getElementById('tax_2').textContent = format_number(tax2);
-  document.getElementById('after_tax_verification').textContent = format_number(before_tax - (tax1 + tax2));
+  document.getElementById('tax_1').textContent = format_number(taxes[0]);
+  document.getElementById('tax_2').textContent = format_number(taxes[1]);
+  document.getElementById('tax_3').textContent = format_number(taxes[2]);
+  document.getElementById('tax_4').textContent = format_number(taxes[3]);
+  document.getElementById('after_tax_verification').textContent = format_number(before_tax - sum(taxes));
 }
-- 
2.44.1