diff --git a/static/js/ao_calc.js b/static/js/ao_calc.js
index 0241981..f677b99 100644
--- a/static/js/ao_calc.js
+++ b/static/js/ao_calc.js
@@ -71,18 +71,18 @@ document.addEventListener("DOMContentLoaded", function () {
         var result = 0
         if (a > b) {
             result = a - b
-            setValue("mat_credit_created", result);
+            setValue("mat_credit_utilized", result);
         }
         else {
-            setValue("mat_credit_created", result);
+            setValue("mat_credit_utilized", result);
         }
 
         if (b > a) {
             result = b - a
-            setValue("mat_credit_utilized", result);
+            setValue("mat_credit_created", result);
         }
         else {
-            setValue("mat_credit_utilized", result);
+            setValue("mat_credit_created", result);
         }
 
         // --- FINAL TAX ---
diff --git a/templates/add_ao.html b/templates/add_ao.html
index c5bef34..7e19adc 100644
--- a/templates/add_ao.html
+++ b/templates/add_ao.html
@@ -80,7 +80,8 @@
         <div class="form-group full-width inline-2">
             <div>
                 <label>Tax @ 30% (A):</label>
-                <input type="number" name="tax_30_percent" step="any" value="0.00" oninput="calculate()" required>
+                <input type="number" name="tax_30_percent" step="any" value="0.00" class="auto" oninput="calculate()"
+                    readonly>
             </div>
             <div>
                 <label>Tax @ 18.5% on Book Profit (B):</label>
diff --git a/templates/add_cit.html b/templates/add_cit.html
index 6b4ea4f..b10c67f 100644
--- a/templates/add_cit.html
+++ b/templates/add_cit.html
@@ -80,7 +80,8 @@
         <div class="form-group full-width inline-2">
             <div>
                 <label>Tax @ 30% (A):</label>
-                <input type="number" name="tax_30_percent" step="any" value="0.00" oninput="calculate()" required>
+                <input type="number" name="tax_30_percent" step="any" value="0.00" class="auto" oninput="calculate()"
+                    readonly>
             </div>
             <div>
                 <label>Tax @ 18.5% on Book Profit (B):</label>
diff --git a/templates/add_itat.html b/templates/add_itat.html
index ab23faa..ea96a26 100644
--- a/templates/add_itat.html
+++ b/templates/add_itat.html
@@ -83,7 +83,8 @@
         <div class="form-group full-width inline-2">
             <div>
                 <label>Tax @ 30% (A):</label>
-                <input type="number" name="tax_30_percent" step="any" value="0.00" oninput="calculate()" required>
+                <input type="number" name="tax_30_percent" class="auto" step="any" value="0.00" oninput="calculate()"
+                    readonly>
             </div>
             <div>
                 <label>Tax @ 18.5% on Book Profit (B):</label>
diff --git a/templates/add_itr.html b/templates/add_itr.html
index d45dc75..e1223d4 100644
--- a/templates/add_itr.html
+++ b/templates/add_itr.html
@@ -80,7 +80,8 @@
         <div class="form-group full-width inline-2">
             <div>
                 <label>Tax @ 30% (A):</label>
-                <input type="number" name="tax_30_percent" step="any" value="0.00" oninput="calculate()" required>
+                <input type="number" name="tax_30_percent" class="auto" step="any" value="0.00" oninput="calculate()"
+                    readonly>
             </div>
             <div>
                 <label>Tax @ 18.5% on Book Profit (B):</label>