diff --git a/employee/models.py b/employee/models.py
index 4122ea4..8775590 100644
--- a/employee/models.py
+++ b/employee/models.py
@@ -12,32 +12,8 @@ class Employee(models.Model):
     start_date = models.DateField()
     end_date = models.DateField(null=True, blank=True)
     projects = models.ManyToManyField(Project)
+    perk_per_month = models.DecimalField(max_digits=15, decimal_places=2)
 
     def __str__(self):
         return self.employee_id
 
-
-class Perk(models.Model):
-    employee = models.OneToOneField(Employee, on_delete=models.CASCADE)
-    perk_per_month = models.DecimalField(max_digits=15, decimal_places=2)
-
-    @property
-    def total_perk(self):
-        perks = self.perk_transactions.all()
-        total = 0
-        for perk in perks:
-            if perk.type == 'INCOME':
-                total += perk.amount
-            else:
-                total -= perk.amount
-        return total
-
-
-class PerkTransaction(models.Model):
-    TRANSACTION_TYPE = (
-        ("INCOME", "INCOME"),
-        ("EXPENSE", "EXPENSE")
-    )
-    type = models.CharField(choices=TRANSACTION_TYPE, default="INCOME", max_length=10)
-    amount = models.DecimalField(max_digits=15, decimal_places=2)
-    perk = models.ForeignKey(Perk, on_delete=models.CASCADE)
diff --git a/expense/models.py b/expense/models.py
index e7e270b..136f121 100644
--- a/expense/models.py
+++ b/expense/models.py
@@ -22,9 +22,9 @@ class Category(models.Model):
 
 
 class Expense(models.Model):
-    PAYMENT_MODE = (
-        ("REIMBURSE", "REIMBURSE"),
-        ("PERK", "PERK")
+    PAYMENT_METHODS = (
+        ("RMB", "Reimburse"),
+        ("PER", "Perk")
     )
     title = models.CharField(max_length=50)
     category = models.ForeignKey(Category, on_delete=models.CASCADE)
@@ -32,7 +32,7 @@ class Expense(models.Model):
     date_of_creation = models.DateField()
     team_member = models.ForeignKey(Employee, on_delete=models.CASCADE)
     company_bank_account = models.ForeignKey(CompanyBankAccount, on_delete=models.CASCADE)
-    repayment_mode = models.CharField(max_length=10, choices=PAYMENT_MODE, default="REIMBURSE")
+    repayment_mode = models.CharField(max_length=10, choices=PAYMENT_METHODS, default=PAYMENT_METHODS[0][0])
 
     @property
     def expense_total(self):
@@ -47,7 +47,7 @@ class Item(models.Model):
     name = models.CharField(max_length=100)
     rate = models.DecimalField(max_digits=15, decimal_places=2)
     quantity = models.IntegerField()
-    expense = models.ForeignKey(Expense, on_delete=models.CASCADE)
+    expense = models.ForeignKey(Expense, on_delete=models.CASCADE, related_name='items')
     attachment = models.ImageField(upload_to='expense_item')
 
     @property