diff --git a/erpnext/accounts/doctype/budget/budget.js b/erpnext/accounts/doctype/budget/budget.js
index d1f9da66c0a..263a6eebc41 100644
--- a/erpnext/accounts/doctype/budget/budget.js
+++ b/erpnext/accounts/doctype/budget/budget.js
@@ -136,6 +136,9 @@ function set_total_budget_amount(frm) {
 function toggle_distribution_fields(frm) {
 	const grid = frm.fields_dict.budget_distribution.grid;
 
+	frm.set_df_property("budget_distribution", "cannot_add_rows", true);
+	frm.set_df_property("budget_distribution", "cannot_delete_rows", true);
+
 	["amount", "percent"].forEach((field) => {
 		grid.update_docfield_property(field, "read_only", frm.doc.distribute_equally);
 	});
diff --git a/erpnext/accounts/doctype/budget/budget.py b/erpnext/accounts/doctype/budget/budget.py
index 595dcf16de6..c1baea189fc 100644
--- a/erpnext/accounts/doctype/budget/budget.py
+++ b/erpnext/accounts/doctype/budget/budget.py
@@ -353,8 +353,8 @@ class Budget(Document):
 		if self.should_regenerate_budget_distribution():
 			return
 
-		total_amount = sum(d.amount for d in self.budget_distribution)
-		total_percent = sum(d.percent for d in self.budget_distribution)
+		total_amount = sum(flt(d.amount) for d in self.budget_distribution)
+		total_percent = sum(flt(d.percent) for d in self.budget_distribution)
 
 		if flt(abs(total_amount - self.budget_amount), 2) > 0.10:
 			frappe.throw(
diff --git a/erpnext/accounts/doctype/budget_distribution/budget_distribution.json b/erpnext/accounts/doctype/budget_distribution/budget_distribution.json
index 85d14599cec..4c9322794e2 100644
--- a/erpnext/accounts/doctype/budget_distribution/budget_distribution.json
+++ b/erpnext/accounts/doctype/budget_distribution/budget_distribution.json
@@ -18,6 +18,7 @@
    "in_list_view": 1,
    "label": "Start Date",
    "read_only": 1,
+   "reqd": 1,
    "search_index": 1
   },
   {
@@ -25,26 +26,29 @@
    "fieldtype": "Date",
    "in_list_view": 1,
    "label": "End Date",
-   "read_only": 1
+   "read_only": 1,
+   "reqd": 1
   },
   {
    "fieldname": "amount",
    "fieldtype": "Currency",
    "in_list_view": 1,
-   "label": "Amount"
+   "label": "Amount",
+   "reqd": 1
   },
   {
    "fieldname": "percent",
    "fieldtype": "Percent",
    "in_list_view": 1,
-   "label": "Percent"
+   "label": "Percent",
+   "reqd": 1
   }
  ],
  "grid_page_length": 50,
  "index_web_pages_for_search": 1,
  "istable": 1,
  "links": [],
- "modified": "2025-11-03 13:18:28.398198",
+ "modified": "2026-06-18 11:23:17.669733",
  "modified_by": "Administrator",
  "module": "Accounts",
  "name": "Budget Distribution",
diff --git a/erpnext/accounts/doctype/budget_distribution/budget_distribution.py b/erpnext/accounts/doctype/budget_distribution/budget_distribution.py
index 4c2cb3bb1bf..c8946f76e93 100644
--- a/erpnext/accounts/doctype/budget_distribution/budget_distribution.py
+++ b/erpnext/accounts/doctype/budget_distribution/budget_distribution.py
@@ -15,12 +15,12 @@ class BudgetDistribution(Document):
 		from frappe.types import DF
 
 		amount: DF.Currency
-		end_date: DF.Date | None
+		end_date: DF.Date
 		parent: DF.Data
 		parentfield: DF.Data
 		parenttype: DF.Data
 		percent: DF.Percent
-		start_date: DF.Date | None
+		start_date: DF.Date
 	# end: auto-generated types
 
 	pass
diff --git a/erpnext/accounts/report/budget_variance_report/budget_variance_report.py b/erpnext/accounts/report/budget_variance_report/budget_variance_report.py
index c839d26490d..cf4d32416c4 100644
--- a/erpnext/accounts/report/budget_variance_report/budget_variance_report.py
+++ b/erpnext/accounts/report/budget_variance_report/budget_variance_report.py
@@ -84,7 +84,13 @@ def build_budget_map(budget_records, filters):
 		budget_distributions = get_budget_distributions(budget)
 
 		for row in budget_distributions:
+			if not row.start_date or not row.end_date:
+				continue
+
 			months = get_months_in_range(row.start_date, row.end_date)
+			if not months:
+				continue
+
 			monthly_budget = flt(row.amount) / len(months)
 
 			for month_date in months: