diff --git a/contract/models/abstract_contract_line.py b/contract/models/abstract_contract_line.py
index a1ed154dc..a7c603367 100644
--- a/contract/models/abstract_contract_line.py
+++ b/contract/models/abstract_contract_line.py
@@ -59,6 +59,8 @@ class ContractAbstractContractLine(models.AbstractModel):
             ('weekly', 'Week(s)'),
             ('monthly', 'Month(s)'),
             ('monthlylastday', 'Month(s) last day'),
+            ('quarterly', 'Quarter(s)'),
+            ('semesterly', 'Semester(s)'),
             ('yearly', 'Year(s)'),
         ],
         default='monthly',
diff --git a/contract/models/contract_line.py b/contract/models/contract_line.py
index e5074d654..d67447965 100644
--- a/contract/models/contract_line.py
+++ b/contract/models/contract_line.py
@@ -799,6 +799,10 @@ class ContractLine(models.Model):
             return relativedelta(months=interval)
         elif recurring_rule_type == 'monthlylastday':
             return relativedelta(months=interval, day=1)
+        elif recurring_rule_type == 'quarterly':
+            return relativedelta(months=3 * interval)
+        elif recurring_rule_type == 'semesterly':
+            return relativedelta(months=6 * interval)
         else:
             return relativedelta(years=interval)
 
diff --git a/contract/tests/test_contract.py b/contract/tests/test_contract.py
index e4b9c7d77..c31c2cbc5 100644
--- a/contract/tests/test_contract.py
+++ b/contract/tests/test_contract.py
@@ -272,6 +272,66 @@ class TestContract(TestContractBase):
         )
         self.assertEqual(self.acct_line.last_date_invoiced, last_date_invoiced)
 
+    def test_contract_quarterly_pre_paid(self):
+        recurring_next_date = to_date('2018-05-22')
+        last_date_invoiced = to_date('2018-05-21')
+        self.acct_line.date_end = '2020-02-22'
+        self.acct_line.recurring_next_date = '2018-02-22'
+        self.acct_line.recurring_rule_type = 'quarterly'
+        self.acct_line.recurring_invoicing_type = 'pre-paid'
+        self.contract.recurring_create_invoice()
+        invoices_weekly = self.contract._get_related_invoices()
+        self.assertTrue(invoices_weekly)
+        self.assertEqual(
+            self.acct_line.recurring_next_date, recurring_next_date
+        )
+        self.assertEqual(self.acct_line.last_date_invoiced, last_date_invoiced)
+
+    def test_contract_quarterly_post_paid(self):
+        recurring_next_date = to_date('2018-05-22')
+        last_date_invoiced = to_date('2018-02-21')
+        self.acct_line.date_end = '2020-02-22'
+        self.acct_line.recurring_next_date = '2018-02-22'
+        self.acct_line.recurring_rule_type = 'quarterly'
+        self.acct_line.recurring_invoicing_type = 'post-paid'
+        self.contract.recurring_create_invoice()
+        invoices_weekly = self.contract._get_related_invoices()
+        self.assertTrue(invoices_weekly)
+        self.assertEqual(
+            self.acct_line.recurring_next_date, recurring_next_date
+        )
+        self.assertEqual(self.acct_line.last_date_invoiced, last_date_invoiced)
+
+    def test_contract_semesterly_pre_paid(self):
+        recurring_next_date = to_date('2018-08-22')
+        last_date_invoiced = to_date('2018-08-21')
+        self.acct_line.date_end = '2020-02-22'
+        self.acct_line.recurring_next_date = '2018-02-22'
+        self.acct_line.recurring_rule_type = 'semesterly'
+        self.acct_line.recurring_invoicing_type = 'pre-paid'
+        self.contract.recurring_create_invoice()
+        invoices_weekly = self.contract._get_related_invoices()
+        self.assertTrue(invoices_weekly)
+        self.assertEqual(
+            self.acct_line.recurring_next_date, recurring_next_date
+        )
+        self.assertEqual(self.acct_line.last_date_invoiced, last_date_invoiced)
+
+    def test_contract_semesterly_post_paid(self):
+        recurring_next_date = to_date('2018-08-22')
+        last_date_invoiced = to_date('2018-02-21')
+        self.acct_line.date_end = '2020-02-22'
+        self.acct_line.recurring_next_date = '2018-02-22'
+        self.acct_line.recurring_rule_type = 'semesterly'
+        self.acct_line.recurring_invoicing_type = 'post-paid'
+        self.contract.recurring_create_invoice()
+        invoices_weekly = self.contract._get_related_invoices()
+        self.assertTrue(invoices_weekly)
+        self.assertEqual(
+            self.acct_line.recurring_next_date, recurring_next_date
+        )
+        self.assertEqual(self.acct_line.last_date_invoiced, last_date_invoiced)
+
     def test_last_invoice_post_paid(self):
         self.acct_line.date_start = '2018-01-01'
         self.acct_line.recurring_invoicing_type = 'post-paid'
diff --git a/product_contract/models/product_template.py b/product_contract/models/product_template.py
index 3ce6bdc44..0e784d993 100644
--- a/product_contract/models/product_template.py
+++ b/product_contract/models/product_template.py
@@ -22,6 +22,8 @@ class ProductTemplate(models.Model):
             ('weekly', 'Week(s)'),
             ('monthly', 'Month(s)'),
             ('monthlylastday', 'Month(s) last day'),
+            ('quarterly', 'Quarter(s)'),
+            ('semesterly', 'Semester(s)'),
             ('yearly', 'Year(s)'),
         ],
         default='monthly',
diff --git a/product_contract/models/sale_order_line.py b/product_contract/models/sale_order_line.py
index bcaf1cef8..4883306db 100644
--- a/product_contract/models/sale_order_line.py
+++ b/product_contract/models/sale_order_line.py
@@ -27,6 +27,8 @@ class SaleOrderLine(models.Model):
             ('weekly', 'Week(s)'),
             ('monthly', 'Month(s)'),
             ('monthlylastday', 'Month(s) last day'),
+            ('quarterly', 'Quarter(s)'),
+            ('semesterly', 'Semester(s)'),
             ('yearly', 'Year(s)'),
         ],
         default='monthly',