diff --git a/l10n_ar_account_withholding/models/account_tax.py b/l10n_ar_account_withholding/models/account_tax.py
index 584c87c20..4cc321a28 100644
--- a/l10n_ar_account_withholding/models/account_tax.py
+++ b/l10n_ar_account_withholding/models/account_tax.py
@@ -66,7 +66,7 @@ def get_withholding_vals(self, payment):
         base_amount = vals['withholdable_base_amount']
 
         if self.withholding_type == 'partner_tax':
-            amount = base_amount * (alicuota)
+            amount = base_amount * (alicuota) * self.ratio / 100
             vals['comment'] = "%s x %s" % (
                 base_amount, alicuota)
             vals['period_withholding_amount'] = amount
@@ -255,7 +255,7 @@ def _compute_amount(
             if not date or str(date) == '1970-01-01':
                 date = fields.Date.context_today(self)
             partner = partner and partner.sudo()
-            return base_amount * self.sudo().get_partner_alicuota_percepcion(partner, date)
+            return base_amount * self.sudo().get_partner_alicuota_percepcion(partner, date) * self.ratio / 100
         else:
             return super(AccountTax, self)._compute_amount(
                 base_amount, price_unit, quantity=quantity, product=product,
diff --git a/l10n_ar_withholding_ux/models/account_tax.py b/l10n_ar_withholding_ux/models/account_tax.py
index c1cc2e42c..a5c553131 100644
--- a/l10n_ar_withholding_ux/models/account_tax.py
+++ b/l10n_ar_withholding_ux/models/account_tax.py
@@ -80,6 +80,7 @@ class AccountTax(models.Model):
         'tax_withholding_id',
         'Rules',
     )
+    ratio = fields.Float(required=True, default=100, help="Ratio to apply to tax base amount")
 
     @api.constrains(
         'withholding_non_taxable_amount',
@@ -224,3 +225,10 @@ def get_withholding_vals(self, payment, force_withholding_amount_type=None):
             'automatic': True,
             'comment': comment,
         }
+
+    @api.constrains('ratio')
+    def _check_line_ids_percent(self):
+        """ Check that the total percent is not bigger than 100.0 """
+        for tax in self:
+            if not (0 < tax.ratio <= 100.0):
+                raise ValidationError(_('The total percentage (%s) should be less or equal to 100!', tax.ratio))
diff --git a/l10n_ar_withholding_ux/views/account_tax_view.xml b/l10n_ar_withholding_ux/views/account_tax_view.xml
index b1690489a..87dd08ec4 100644
--- a/l10n_ar_withholding_ux/views/account_tax_view.xml
+++ b/l10n_ar_withholding_ux/views/account_tax_view.xml
@@ -47,6 +47,7 @@
                             </div>
                             <field name="withholding_non_taxable_minimum"/>
                             <field name="withholding_non_taxable_amount"/>
+                            <field name="ratio"/>
                             <field name="withholding_user_error_message"/>
                             <field name="withholding_user_error_domain" invisible="not withholding_user_error_message"/>
                         </group>