Extend incoming for better usage.

app/Models/Incomingtax.php

@@ -22,6 +22,19 @@ class Incomingtax extends Model
         'currency',
     ];
 
+    /**
+     * The attributes that are appended with attribute getters.
+     *
+     * @var string[]
+     */
+    protected $appends = [
+        'gross',
+    ];
+
+    public function getGrossAttribute() {
+        return number_format($this->taxable_amount + $this->amount, 2);
+    }
+
     /**
      * Get the incoming invoice this tax belongs to.
      */