diff --git a/app/DataMapper/QuickbooksSync.php b/app/DataMapper/QuickbooksSync.php
index edebae1e49..82322e75bf 100644
--- a/app/DataMapper/QuickbooksSync.php
+++ b/app/DataMapper/QuickbooksSync.php
@@ -12,8 +12,14 @@
 
 namespace App\DataMapper;
 
+use App\Models\Product;
+
 /**
  * QuickbooksSync.
+ *
+ * Product type to income account mapping:
+ * Keys are Product::PRODUCT_TYPE_* constants (int). Values are income account names (string).
+ * Example: [Product::PRODUCT_TYPE_SERVICE => 'Service Income', Product::PRODUCT_TYPE_PHYSICAL => 'Sales of Product Income']
  */
 class QuickbooksSync
 {
@@ -39,6 +45,14 @@ class QuickbooksSync
 
     public string $default_expense_account = '';
 
+    /**
+     * Map of product type id (Product::PRODUCT_TYPE_*) to income account name.
+     * E.g. [2 => 'Service Income', 1 => 'Sales of Product Income']
+     *
+     * @var array<int, string>
+     */
+    public array $product_type_income_account_map = [];
+
     public function __construct(array $attributes = [])
     {
         $this->client = new QuickbooksSyncMap($attributes['client'] ?? []);
@@ -52,6 +66,45 @@ class QuickbooksSync
         $this->expense = new QuickbooksSyncMap($attributes['expense'] ?? []);
         $this->default_income_account = $attributes['default_income_account'] ?? '';
         $this->default_expense_account = $attributes['default_expense_account'] ?? '';
+        $map = $attributes['product_type_income_account_map'] ?? [];
+        $this->product_type_income_account_map = self::normalizeProductTypeIncomeAccountMap($map);
+    }
+
+    /**
+     * Normalize product_type_income_account_map so keys are int (product type ids).
+     */
+    private static function normalizeProductTypeIncomeAccountMap(mixed $map): array
+    {
+        if (! is_array($map)) {
+            return [];
+        }
+        $out = [];
+        foreach ($map as $k => $v) {
+            if (is_string($v) && $v !== '') {
+                $out[(int) $k] = $v;
+            }
+        }
+        return $out;
+    }
+
+    /**
+     * Suggested default mapping of Product::PRODUCT_TYPE_* to common QuickBooks income account names.
+     * Use when building UI defaults or onboarding; stored config overrides these.
+     */
+    public static function defaultProductTypeIncomeAccountMap(): array
+    {
+        return [
+            Product::PRODUCT_TYPE_PHYSICAL => 'Sales of Product Income',
+            Product::PRODUCT_TYPE_SERVICE => 'Service Income',
+            Product::PRODUCT_TYPE_DIGITAL => 'Sales of Product Income',
+            Product::PRODUCT_TYPE_SHIPPING => 'Shipping and Delivery Income',
+            Product::PRODUCT_TYPE_EXEMPT => 'Sales of Product Income',
+            Product::PRODUCT_TYPE_REDUCED_TAX => 'Sales of Product Income',
+            Product::PRODUCT_TYPE_OVERRIDE_TAX => 'Sales of Product Income',
+            Product::PRODUCT_TYPE_ZERO_RATED => 'Sales of Product Income',
+            Product::PRODUCT_TYPE_REVERSE_TAX => 'Sales of Product Income',
+            Product::PRODUCT_INTRA_COMMUNITY => 'Sales of Product Income',
+        ];
     }
 
     public function toArray(): array
@@ -68,6 +121,7 @@ class QuickbooksSync
             'expense' => $this->expense->toArray(),
             'default_income_account' => $this->default_income_account,
             'default_expense_account' => $this->default_expense_account,
+            'product_type_income_account_map' => $this->product_type_income_account_map,
         ];
     }
 }