diff --git a/hrms/payroll/doctype/salary_structure/test_salary_structure.py b/hrms/payroll/doctype/salary_structure/test_salary_structure.py
index b013ecdc41..a52741df56 100644
--- a/hrms/payroll/doctype/salary_structure/test_salary_structure.py
+++ b/hrms/payroll/doctype/salary_structure/test_salary_structure.py
@@ -264,8 +264,8 @@ def create_salary_structure_assignment(
 	salary_structure_assignment.currency = currency
 	salary_structure_assignment.payroll_payable_account = get_payable_account(company)
 	salary_structure_assignment.company = company or erpnext.get_default_company()
-	salary_structure_assignment.save(ignore_permissions=True)
 	salary_structure_assignment.income_tax_slab = income_tax_slab
+	salary_structure_assignment.save(ignore_permissions=True)
 	salary_structure_assignment.submit()
 	return salary_structure_assignment
 
diff --git a/hrms/payroll/doctype/salary_structure_assignment/salary_structure_assignment.py b/hrms/payroll/doctype/salary_structure_assignment/salary_structure_assignment.py
index 4e79771315..48aad837e5 100644
--- a/hrms/payroll/doctype/salary_structure_assignment/salary_structure_assignment.py
+++ b/hrms/payroll/doctype/salary_structure_assignment/salary_structure_assignment.py
@@ -5,7 +5,7 @@
 import frappe
 from frappe import _
 from frappe.model.document import Document
-from frappe.utils import flt, getdate
+from frappe.utils import cint, flt, get_link_to_form, getdate
 
 
 class DuplicateAssignment(frappe.ValidationError):
@@ -90,6 +90,18 @@ def validate_company(self):
 			)
 
 	def validate_income_tax_slab(self):
+		tax_component = get_tax_component(self.salary_structure)
+		if tax_component and not self.income_tax_slab:
+			frappe.throw(
+				_(
+					"Income Tax Slab is mandatory since the Salary Structure {0} has a tax component {1}"
+				).format(
+					get_link_to_form("Salary Structure", self.salary_structure), frappe.bold(tax_component)
+				),
+				exc=frappe.MandatoryError,
+				title=_("Missing Mandatory Field"),
+			)
+
 		if not self.income_tax_slab:
 			return
 
@@ -216,3 +228,11 @@ def get_employee_currency(employee):
 			)
 		)
 	return employee_currency
+
+
+def get_tax_component(salary_structure: str) -> str | None:
+	salary_structure = frappe.get_cached_doc("Salary Structure", salary_structure)
+	for d in salary_structure.deductions:
+		if cint(d.variable_based_on_taxable_salary) and not d.formula and not flt(d.amount):
+			return d.salary_component
+	return None