diff --git a/bruno/api_v1/customer/Set is_no_vat.yml b/bruno/api_v1/customer/Set is_no_vat.yml
index c159ad3..eaa70ff 100644
--- a/bruno/api_v1/customer/Set is_no_vat.yml	
+++ b/bruno/api_v1/customer/Set is_no_vat.yml	
@@ -5,7 +5,14 @@ info:
 
 http:
   method: PATCH
-  url: "{{bas_url"
+  url: "{{bas_url}}/restricted/customer/no-vat"
+  body:
+    type: json
+    data: |-
+      {
+        "customer_id":1,
+        "is_no_vat": false
+      }
   auth: inherit
 
 settings:
diff --git a/i18n/migrations/20260319163200_procedures.sql b/i18n/migrations/20260319163200_procedures.sql
index 267985a..b823a3a 100644
--- a/i18n/migrations/20260319163200_procedures.sql
+++ b/i18n/migrations/20260319163200_procedures.sql
@@ -16,6 +16,7 @@ READS SQL DATA
 BEGIN
 
   DECLARE v_tax_rate DECIMAL(10,4) DEFAULT 0;
+  DECLARE v_tax_group INT;
 
   DECLARE v_base_raw DECIMAL(20,6);
   DECLARE v_base DECIMAL(20,6);
@@ -29,45 +30,54 @@ BEGIN
 
   DECLARE v_has_specific INT DEFAULT 0;
 
-  -- currency
   DECLARE v_target_currency BIGINT;
   DECLARE v_target_rate DECIMAL(13,6) DEFAULT 1;
   DECLARE v_specific_rate DECIMAL(13,6) DEFAULT 1;
 
+  DECLARE v_is_no_vat TINYINT DEFAULT 0;
+
   SET p_id_product_attribute = NULLIF(p_id_product_attribute, 0);
 
+  -- ================= CUSTOMER VAT =================
+  SELECT COALESCE(c.is_no_vat, 0)
+  INTO v_is_no_vat
+  FROM b2b_customers c
+  WHERE c.id = p_id_customer
+  LIMIT 1;
+
+  -- ================= TAX GROUP =================
+  SELECT ps.id_tax_rules_group
+  INTO v_tax_group
+  FROM ps_product_shop ps
+  WHERE ps.id_product = p_id_product
+    AND ps.id_shop = p_id_shop
+  LIMIT 1;
+
   -- ================= TAX =================
   SELECT COALESCE(t.rate, 0)
   INTO v_tax_rate
   FROM ps_tax_rule tr
   JOIN ps_tax t ON t.id_tax = tr.id_tax
   LEFT JOIN b2b_countries c ON c.id = p_id_country
-  WHERE tr.id_tax_rules_group = (
-    SELECT ps.id_tax_rules_group
-    FROM ps_product_shop ps
-    WHERE ps.id_product = p_id_product
-      AND ps.id_shop = p_id_shop
-    LIMIT 1
-  )
-  AND tr.id_country = c.ps_id_country
+  WHERE tr.id_tax_rules_group = v_tax_group
+    AND tr.id_country = c.ps_id_country
   LIMIT 1;
 
-  -- ================= TARGET CURRENCY =================
-  SELECT c.b2b_id_currency
-  INTO v_target_currency
+  IF v_is_no_vat = 1 THEN
+    SET v_tax_rate = 0;
+  END IF;
+
+  -- ================= CURRENCY =================
+  SELECT c.b2b_id_currency, r.conversion_rate
+  INTO v_target_currency, v_target_rate
   FROM b2b_countries c
+  LEFT JOIN b2b_currency_rates r
+    ON r.b2b_id_currency = c.b2b_id_currency
   WHERE c.id = p_id_country
-  LIMIT 1;
-
-  -- latest target rate
-  SELECT r.conversion_rate
-  INTO v_target_rate
-  FROM b2b_currency_rates r
-  WHERE r.b2b_id_currency = v_target_currency
   ORDER BY r.created_at DESC
   LIMIT 1;
 
-  -- ================= BASE PRICE (RAW) =================
+  -- ================= BASE PRICE =================
   SELECT
     COALESCE(ps.price, p.price) + COALESCE(pas.price, 0)
   INTO v_base_raw
@@ -79,8 +89,8 @@ BEGIN
     AND pas.id_shop = p_id_shop
   WHERE p.id_product = p_id_product;
 
-  -- convert base to target currency
   SET v_base = v_base_raw * v_target_rate;
+  SET v_excl = v_base;
 
   -- ================= RULE SELECTION =================
   SELECT
@@ -99,71 +109,67 @@ BEGIN
 
   FROM b2b_specific_price bsp
 
+  LEFT JOIN b2b_specific_price_product spp
+    ON spp.b2b_specific_price_id = bsp.id
+    AND spp.id_product = p_id_product
+
+  LEFT JOIN b2b_specific_price_product_attribute spa
+    ON spa.b2b_specific_price_id = bsp.id
+    AND spa.id_product_attribute = p_id_product_attribute
+
+  LEFT JOIN b2b_specific_price_customer spc
+    ON spc.b2b_specific_price_id = bsp.id
+    AND spc.b2b_id_customer = p_id_customer
+
+  LEFT JOIN b2b_specific_price_country spco
+    ON spco.b2b_specific_price_id = bsp.id
+    AND spco.b2b_id_country = p_id_country
+
+  LEFT JOIN b2b_specific_price_category spcat
+    ON spcat.b2b_specific_price_id = bsp.id
+
+  LEFT JOIN ps_category_product cp
+    ON cp.id_category = spcat.id_category
+    AND cp.id_product = p_id_product
+
   WHERE bsp.is_active = 1
     AND bsp.from_quantity <= p_quantity
 
-    -- intersection rules (unchanged)
-    AND (
-      NOT EXISTS (SELECT 1 FROM b2b_specific_price_product x WHERE x.b2b_specific_price_id = bsp.id)
-      OR EXISTS (SELECT 1 FROM b2b_specific_price_product x WHERE x.b2b_specific_price_id = bsp.id AND x.id_product = p_id_product)
-    )
+    AND (spp.id_product IS NOT NULL OR NOT EXISTS (
+          SELECT 1 FROM b2b_specific_price_product x WHERE x.b2b_specific_price_id = bsp.id
+        ))
 
-    AND (
-      NOT EXISTS (SELECT 1 FROM b2b_specific_price_product_attribute x WHERE x.b2b_specific_price_id = bsp.id)
-      OR EXISTS (SELECT 1 FROM b2b_specific_price_product_attribute x WHERE x.b2b_specific_price_id = bsp.id AND x.id_product_attribute = p_id_product_attribute)
-    )
+    AND (spa.id_product_attribute IS NOT NULL OR NOT EXISTS (
+          SELECT 1 FROM b2b_specific_price_product_attribute x WHERE x.b2b_specific_price_id = bsp.id
+        ))
 
-    AND (
-      NOT EXISTS (SELECT 1 FROM b2b_specific_price_category x WHERE x.b2b_specific_price_id = bsp.id)
-      OR EXISTS (
-        SELECT 1 FROM b2b_specific_price_category x
-        JOIN ps_category_product cp ON cp.id_category = x.id_category
-        WHERE x.b2b_specific_price_id = bsp.id AND cp.id_product = p_id_product
-      )
-    )
+    AND (spc.b2b_id_customer IS NOT NULL OR NOT EXISTS (
+          SELECT 1 FROM b2b_specific_price_customer x WHERE x.b2b_specific_price_id = bsp.id
+        ))
 
-    AND (
-      NOT EXISTS (SELECT 1 FROM b2b_specific_price_customer x WHERE x.b2b_specific_price_id = bsp.id)
-      OR EXISTS (SELECT 1 FROM b2b_specific_price_customer x WHERE x.b2b_specific_price_id = bsp.id AND x.b2b_id_customer = p_id_customer)
-    )
+    AND (spco.b2b_id_country IS NOT NULL OR NOT EXISTS (
+          SELECT 1 FROM b2b_specific_price_country x WHERE x.b2b_specific_price_id = bsp.id
+        ))
 
-    AND (
-      NOT EXISTS (SELECT 1 FROM b2b_specific_price_country x WHERE x.b2b_specific_price_id = bsp.id)
-      OR EXISTS (SELECT 1 FROM b2b_specific_price_country x WHERE x.b2b_specific_price_id = bsp.id AND x.b2b_id_country = p_id_country)
-    )
+    AND (cp.id_product IS NOT NULL OR NOT EXISTS (
+          SELECT 1 FROM b2b_specific_price_category x WHERE x.b2b_specific_price_id = bsp.id
+        ))
 
   ORDER BY
-    -- customer wins
-    (EXISTS (SELECT 1 FROM b2b_specific_price_customer x WHERE x.b2b_specific_price_id = bsp.id AND x.b2b_id_customer = p_id_customer)) DESC,
-
-    -- attribute
-    (EXISTS (SELECT 1 FROM b2b_specific_price_product_attribute x WHERE x.b2b_specific_price_id = bsp.id AND x.id_product_attribute = p_id_product_attribute)) DESC,
-
-    -- product
-    (EXISTS (SELECT 1 FROM b2b_specific_price_product x WHERE x.b2b_specific_price_id = bsp.id AND x.id_product = p_id_product)) DESC,
-
-    -- category
-    (EXISTS (
-      SELECT 1 FROM b2b_specific_price_category x
-      JOIN ps_category_product cp ON cp.id_category = x.id_category
-      WHERE x.b2b_specific_price_id = bsp.id AND cp.id_product = p_id_product
-    )) DESC,
-
-    -- country
-    (EXISTS (SELECT 1 FROM b2b_specific_price_country x WHERE x.b2b_specific_price_id = bsp.id AND x.b2b_id_country = p_id_country)) DESC,
-
+    (spc.b2b_id_customer IS NOT NULL) DESC,
+    (spa.id_product_attribute IS NOT NULL) DESC,
+    (spp.id_product IS NOT NULL) DESC,
+    (cp.id_product IS NOT NULL) DESC,
+    (spco.b2b_id_country IS NOT NULL) DESC,
     bsp.id DESC
 
   LIMIT 1;
 
   -- ================= APPLY =================
-  SET v_excl = v_base;
-
   IF v_has_specific = 1 THEN
 
     IF v_reduction_type = 'amount' THEN
 
-      -- convert specific price currency if needed
       IF v_specific_currency_id IS NOT NULL AND v_specific_currency_id != v_target_currency THEN
 
         SELECT r.conversion_rate
@@ -173,7 +179,6 @@ BEGIN
         ORDER BY r.created_at DESC
         LIMIT 1;
 
-        -- normalize → then convert to target
         SET v_excl = (v_fixed_price / v_specific_rate) * v_target_rate;
 
       ELSE