diff --git a/src/lib/components/FilterBar.svelte b/src/lib/components/FilterBar.svelte
index 0634b28..247982e 100644
--- a/src/lib/components/FilterBar.svelte
+++ b/src/lib/components/FilterBar.svelte
@@ -13,6 +13,7 @@
 
 	// Transform tags to Svelecte format
 	let tagOptions = $derived(availableTags.map((t) => ({ value: t.name, label: t.name })));
+	let availableTagNames = $derived(new Set(availableTags.map((t) => t.name.toLowerCase())));
 
 	// Track selected tag names for Svelecte
 	let selectedTagNames = $state(filters.tags);
@@ -22,6 +23,14 @@
 		selectedTagNames = filters.tags;
 	});
 
+	// Remove deleted tags from filter when availableTags changes
+	$effect(() => {
+		const validTags = filters.tags.filter((t) => availableTagNames.has(t.toLowerCase()));
+		if (validTags.length !== filters.tags.length) {
+			onchange({ ...filters, tags: validTags });
+		}
+	});
+
 	function handleTypeChange(newType: 'task' | 'thought' | 'all') {
 		onchange({ ...filters, type: newType });
 	}