diff --git a/.changeset/eleven-horses-shop.md b/.changeset/eleven-horses-shop.md
new file mode 100644
index 00000000..84b63caf
--- /dev/null
+++ b/.changeset/eleven-horses-shop.md
@@ -0,0 +1,5 @@
+---
+"task-master-ai": patch
+---
+
+Fix for tasks not found when using string IDs
diff --git a/scripts/modules/utils.js b/scripts/modules/utils.js
index e8a92dd9..fa6cdc26 100644
--- a/scripts/modules/utils.js
+++ b/scripts/modules/utils.js
@@ -262,6 +262,43 @@ function hasTaggedStructure(data) {
 	return false;
 }
 
+/**
+ * Normalizes task IDs to ensure they are numbers instead of strings
+ * @param {Array} tasks - Array of tasks to normalize
+ */
+function normalizeTaskIds(tasks) {
+	if (!Array.isArray(tasks)) return;
+
+	tasks.forEach((task) => {
+		// Convert task ID to number with validation
+		if (task.id !== undefined) {
+			const parsedId = parseInt(task.id, 10);
+			if (!isNaN(parsedId) && parsedId > 0) {
+				task.id = parsedId;
+			}
+		}
+
+		// Convert subtask IDs to numbers with validation
+		if (Array.isArray(task.subtasks)) {
+			task.subtasks.forEach((subtask) => {
+				if (subtask.id !== undefined) {
+					// Check for dot notation (which shouldn't exist in storage)
+					if (typeof subtask.id === 'string' && subtask.id.includes('.')) {
+						// Extract the subtask part after the dot
+						const parts = subtask.id.split('.');
+						subtask.id = parseInt(parts[parts.length - 1], 10);
+					} else {
+						const parsedSubtaskId = parseInt(subtask.id, 10);
+						if (!isNaN(parsedSubtaskId) && parsedSubtaskId > 0) {
+							subtask.id = parsedSubtaskId;
+						}
+					}
+				}
+			});
+		}
+	});
+}
+
 /**
  * Reads and parses a JSON file
  * @param {string} filepath - Path to the JSON file
@@ -322,6 +359,8 @@ function readJSON(filepath, projectRoot = null, tag = null) {
 			console.log(`File is in legacy format, performing migration...`);
 		}
 
+		normalizeTaskIds(data.tasks);
+
 		// This is legacy format - migrate it to tagged format
 		const migratedData = {
 			master: {
@@ -401,6 +440,16 @@ function readJSON(filepath, projectRoot = null, tag = null) {
 		// Store reference to the raw tagged data for functions that need it
 		const originalTaggedData = JSON.parse(JSON.stringify(data));
 
+		// Normalize IDs in all tags before storing as originalTaggedData
+		for (const tagName in originalTaggedData) {
+			if (
+				originalTaggedData[tagName] &&
+				Array.isArray(originalTaggedData[tagName].tasks)
+			) {
+				normalizeTaskIds(originalTaggedData[tagName].tasks);
+			}
+		}
+
 		// Check and auto-switch git tags if enabled (for existing tagged format)
 		// This needs to run synchronously BEFORE tag resolution
 		if (projectRoot) {
@@ -448,6 +497,8 @@ function readJSON(filepath, projectRoot = null, tag = null) {
 			// Get the data for the resolved tag
 			const tagData = data[resolvedTag];
 			if (tagData && tagData.tasks) {
+				normalizeTaskIds(tagData.tasks);
+
 				// Add the _rawTaggedData property and the resolved tag to the returned data
 				const result = {
 					...tagData,
@@ -464,6 +515,8 @@ function readJSON(filepath, projectRoot = null, tag = null) {
 				// If the resolved tag doesn't exist, fall back to master
 				const masterData = data.master;
 				if (masterData && masterData.tasks) {
+					normalizeTaskIds(masterData.tasks);
+
 					if (isDebug) {
 						console.log(
 							`Tag '${resolvedTag}' not found, falling back to master with ${masterData.tasks.length} tasks`
@@ -493,6 +546,7 @@ function readJSON(filepath, projectRoot = null, tag = null) {
 			// If anything goes wrong, try to return master or empty
 			const masterData = data.master;
 			if (masterData && masterData.tasks) {
+				normalizeTaskIds(masterData.tasks);
 				return {
 					...masterData,
 					_rawTaggedData: originalTaggedData
@@ -1412,5 +1466,6 @@ export {
 	createStateJson,
 	markMigrationForNotice,
 	flattenTasksWithSubtasks,
-	ensureTagMetadata
+	ensureTagMetadata,
+	normalizeTaskIds
 };
diff --git a/tests/unit/task-finder.test.js b/tests/unit/task-finder.test.js
index b480a2a2..92e24c26 100644
--- a/tests/unit/task-finder.test.js
+++ b/tests/unit/task-finder.test.js
@@ -23,6 +23,82 @@ describe('Task Finder', () => {
 			expect(result.originalSubtaskCount).toBeNull();
 		});
 
+		test('should find tasks when JSON contains string IDs (normalized to numbers)', () => {
+			// Simulate tasks loaded from JSON with string IDs and mixed subtask notations
+			const tasksWithStringIds = [
+				{ id: '1', title: 'First Task' },
+				{
+					id: '2',
+					title: 'Second Task',
+					subtasks: [
+						{ id: '1', title: 'Subtask One' },
+						{ id: '2.2', title: 'Subtask Two (with dotted notation)' } // Testing dotted notation
+					]
+				},
+				{
+					id: '5',
+					title: 'Fifth Task',
+					subtasks: [
+						{ id: '5.1', title: 'Subtask with dotted ID' }, // Should normalize to 1
+						{ id: '3', title: 'Subtask with simple ID' } // Should stay as 3
+					]
+				}
+			];
+
+			// The readJSON function should normalize these IDs to numbers
+			// For this test, we'll manually normalize them to simulate what happens
+			tasksWithStringIds.forEach((task) => {
+				task.id = parseInt(task.id, 10);
+				if (task.subtasks) {
+					task.subtasks.forEach((subtask) => {
+						// Handle dotted notation like "5.1" -> extract the subtask part
+						if (typeof subtask.id === 'string' && subtask.id.includes('.')) {
+							const parts = subtask.id.split('.');
+							subtask.id = parseInt(parts[parts.length - 1], 10);
+						} else {
+							subtask.id = parseInt(subtask.id, 10);
+						}
+					});
+				}
+			});
+
+			// Test finding tasks by numeric ID
+			const result1 = findTaskById(tasksWithStringIds, 5);
+			expect(result1.task).toBeDefined();
+			expect(result1.task.id).toBe(5);
+			expect(result1.task.title).toBe('Fifth Task');
+
+			// Test finding tasks by string ID
+			const result2 = findTaskById(tasksWithStringIds, '5');
+			expect(result2.task).toBeDefined();
+			expect(result2.task.id).toBe(5);
+
+			// Test finding subtasks with normalized IDs
+			const result3 = findTaskById(tasksWithStringIds, '2.1');
+			expect(result3.task).toBeDefined();
+			expect(result3.task.id).toBe(1);
+			expect(result3.task.title).toBe('Subtask One');
+			expect(result3.task.isSubtask).toBe(true);
+
+			// Test subtask that was originally "2.2" (should be normalized to 2)
+			const result4 = findTaskById(tasksWithStringIds, '2.2');
+			expect(result4.task).toBeDefined();
+			expect(result4.task.id).toBe(2);
+			expect(result4.task.title).toBe('Subtask Two (with dotted notation)');
+
+			// Test subtask that was originally "5.1" (should be normalized to 1)
+			const result5 = findTaskById(tasksWithStringIds, '5.1');
+			expect(result5.task).toBeDefined();
+			expect(result5.task.id).toBe(1);
+			expect(result5.task.title).toBe('Subtask with dotted ID');
+
+			// Test subtask that was originally "3" (should stay as 3)
+			const result6 = findTaskById(tasksWithStringIds, '5.3');
+			expect(result6.task).toBeDefined();
+			expect(result6.task.id).toBe(3);
+			expect(result6.task.title).toBe('Subtask with simple ID');
+		});
+
 		test('should find a subtask using dot notation', () => {
 			const result = findTaskById(sampleTasks.tasks, '3.1');
 			expect(result.task).toBeDefined();