diff --git a/frontend/src/components/analytics/TagChart.vue b/frontend/src/components/analytics/TagChart.vue
new file mode 100644
index 0000000..51cb28d
--- /dev/null
+++ b/frontend/src/components/analytics/TagChart.vue
@@ -0,0 +1,93 @@
+<template>
+  <div class="card card-body">
+    <h3 class="card-title block mb-4">Repartition par tag</h3>
+    <div class="h-64">
+      <Doughnut
+        v-if="chartData.labels.length > 0"
+        :data="chartData"
+        :options="chartOptions"
+      />
+      <div v-else class="h-full flex items-center justify-center text-gray-500 text-sm">
+        Aucune donnee
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { computed } from 'vue'
+import { Doughnut } from 'vue-chartjs'
+import { Chart as ChartJS, ArcElement, Tooltip, Legend } from 'chart.js'
+
+ChartJS.register(ArcElement, Tooltip, Legend)
+
+const props = defineProps({
+  data: {
+    type: Array,
+    default: () => []
+  }
+})
+
+const colors = [
+  '#3B82F6', // blue
+  '#EF4444', // red
+  '#10B981', // green
+  '#F59E0B', // amber
+  '#8B5CF6', // purple
+  '#EC4899', // pink
+  '#06B6D4', // cyan
+  '#84CC16', // lime
+  '#F97316', // orange
+  '#6366F1', // indigo
+]
+
+/** Gris pour les depenses sans tag : elles restent visibles - c'est le
+    travail de tagging qui reste a faire - sans se disputer une couleur
+    avec les postes reels. */
+const COULEUR_SANS_TAG = '#6B7280'
+
+const parts = computed(() => props.data.filter((p) => (p.total_debit ?? 0) > 0).slice(0, 10))
+
+const chartData = computed(() => ({
+  labels: parts.value.map((p) => tronquer(p.tag_nom || 'Non taggue')),
+  datasets: [{
+    data: parts.value.map((p) => p.total_debit),
+    backgroundColor: parts.value.map((p, i) =>
+      p.tag_id === null || p.tag_id === undefined ? COULEUR_SANS_TAG : colors[i % colors.length]
+    ),
+    borderColor: '#1F2937',
+    borderWidth: 2
+  }]
+}))
+
+const chartOptions = {
+  responsive: true,
+  maintainAspectRatio: false,
+  plugins: {
+    legend: {
+      position: 'right',
+      labels: {
+        color: '#9CA3AF',
+        font: { size: 11 },
+        boxWidth: 12,
+        padding: 8
+      }
+    },
+    tooltip: {
+      callbacks: {
+        label: (ctx) => {
+          const value = new Intl.NumberFormat('fr-FR', {
+            style: 'currency',
+            currency: 'EUR'
+          }).format(ctx.raw)
+          return ` ${value}`
+        }
+      }
+    }
+  }
+}
+
+function tronquer(nom) {
+  return nom.substring(0, 25)
+}
+</script>
diff --git a/frontend/src/pages/AnalyticsPage.vue b/frontend/src/pages/AnalyticsPage.vue
index 56987fc..1de2139 100644
--- a/frontend/src/pages/AnalyticsPage.vue
+++ b/frontend/src/pages/AnalyticsPage.vue
@@ -21,12 +21,16 @@
       <!-- KPI Cards -->
       <KpiCards :summary="summary" />
 
-      <!-- Charts Row -->
+      <!-- Les deux repartitions cote a cote : meme total, deux decoupages. -->
       <div class="grid grid-cols-1 lg:grid-cols-2 gap-6">
         <CategoryChart :data="summary.by_category || []" />
-        <MonthlyChart :data="summary.by_month || []" />
+        <TagChart :data="summary.by_tag || []" />
       </div>
 
+      <!-- L'evolution mensuelle prend toute la largeur : un axe de temps
+           serre est le premier a devenir illisible. -->
+      <MonthlyChart :data="summary.by_month || []" />
+
       <!-- Top Fournisseurs -->
       <TopFournisseursChart :data="summary.by_fournisseur || []" />
 
@@ -45,6 +49,7 @@ import { ref, onMounted } from 'vue'
 import FilterPanel from '../components/analytics/FilterPanel.vue'
 import KpiCards from '../components/analytics/KpiCards.vue'
 import CategoryChart from '../components/analytics/CategoryChart.vue'
+import TagChart from '../components/analytics/TagChart.vue'
 import MonthlyChart from '../components/analytics/MonthlyChart.vue'
 import TopFournisseursChart from '../components/analytics/TopFournisseursChart.vue'
 import DepensesTable from '../components/analytics/DepensesTable.vue'