diff --git a/backend/services/analyticsService.js b/backend/services/analyticsService.js
index 470cf5f..0d0683d 100644
--- a/backend/services/analyticsService.js
+++ b/backend/services/analyticsService.js
@@ -53,6 +53,15 @@ const buildDateFilter = ({ start, end } = {}) => {
     };
 };
 
+const getPreviousDate = (value) => {
+    const normalizedDate = normalizeDateParam(value);
+    if (!normalizedDate) return null;
+
+    const date = new Date(`${normalizedDate}T00:00:00.000Z`);
+    date.setUTCDate(date.getUTCDate() - 1);
+    return date.toISOString().slice(0, 10);
+};
+
 const toNumber = (value) => Number(value || 0);
 
 const RFM_SEGMENTS = {
@@ -253,9 +262,11 @@ const getClientAnalytics = async (range = {}) => {
 
 const getRfmAnalytics = async (range = {}) => {
     const { params, whereClause } = buildDateFilter(range);
+    const normalizedStart = normalizeDateParam(range.start);
     const normalizedEnd = normalizeDateParam(range.end);
-    const recencyReferenceDate = normalizedEnd ? '$1::date' : 'CURRENT_DATE';
-    const historyParams = normalizedEnd ? [normalizedEnd] : [];
+    const tagReference = getPreviousDate(normalizedStart) || normalizedEnd;
+    const recencyReferenceDate = tagReference ? '$1::date' : 'CURRENT_DATE';
+    const historyParams = tagReference ? [tagReference] : [];
 
     const [periodResult, historyResult] = await Promise.all([
         pool.query(`
@@ -292,13 +303,7 @@ const getRfmAnalytics = async (range = {}) => {
         `, historyParams)
     ]);
 
-    const periodByPhone = new Map(periodResult.rows.map(row => [row.phone, {
-        monetary: toNumber(row.monetary),
-        frequency: toNumber(row.frequency),
-        quantityPurchased: toNumber(row.quantity_purchased)
-    }]));
-
-    const clients = buildRfmClients(historyResult.rows.map(row => ({
+    const historyClients = buildRfmClients(historyResult.rows.map(row => ({
         name: row.name,
         phone: row.phone,
         monetary: toNumber(row.monetary),
@@ -306,14 +311,39 @@ const getRfmAnalytics = async (range = {}) => {
         quantityPurchased: toNumber(row.quantity_purchased),
         lastPurchaseDate: row.last_purchase_date,
         recencyDays: toNumber(row.recency_days)
-    }))).map(client => {
-        const periodClient = periodByPhone.get(client.phone);
+    })));
+    const tagsByPhone = new Map(historyClients.map(client => [client.phone, client]));
+
+    const clients = periodResult.rows.map(row => {
+        const taggedClient = tagsByPhone.get(row.phone);
+        if (!taggedClient) {
+            const newCustomerSegment = getRfmSegment(3, 1);
+            return {
+                name: row.name,
+                phone: row.phone,
+                monetary: toNumber(row.monetary),
+                frequency: toNumber(row.frequency),
+                quantityPurchased: toNumber(row.quantity_purchased),
+                lastPurchaseDate: row.last_purchase_date,
+                recencyDays: 0,
+                recencyScore: 3,
+                frequencyScore: 1,
+                monetaryScore: 1,
+                valueScore: 1,
+                rfmScore: '311',
+                segmentKey: newCustomerSegment.key,
+                segmentLabel: newCustomerSegment.label
+            };
+        }
 
         return {
-            ...client,
-            monetary: periodClient?.monetary || 0,
-            frequency: periodClient?.frequency || 0,
-            quantityPurchased: periodClient?.quantityPurchased || 0
+            ...taggedClient,
+            name: row.name,
+            phone: row.phone,
+            monetary: toNumber(row.monetary),
+            frequency: toNumber(row.frequency),
+            quantityPurchased: toNumber(row.quantity_purchased),
+            lastPurchaseDate: row.last_purchase_date
         };
     }).sort((a, b) => {
         if (b.recencyScore !== a.recencyScore) return b.recencyScore - a.recencyScore;
@@ -339,6 +369,7 @@ module.exports = {
     buildDateFilter,
     buildRfmClients,
     buildRfmSegments,
+    getPreviousDate,
     getRfmAnalytics,
     getRfmSegment,
     getClientAnalytics,
diff --git a/backend/test/analyticsService.test.js b/backend/test/analyticsService.test.js
index af3695a..a878e8c 100644
--- a/backend/test/analyticsService.test.js
+++ b/backend/test/analyticsService.test.js
@@ -5,6 +5,7 @@ const {
     buildRfmClients,
     buildRfmSegments,
     buildDateFilter,
+    getPreviousDate,
     getRfmAnalytics,
     getRfmSegment,
     normalizeDateParam,
@@ -82,6 +83,12 @@ test('buildDateFilter ignores invalid bounds', () => {
     );
 });
 
+test('getPreviousDate returns the calendar day before an ISO date', () => {
+    assert.equal(getPreviousDate('2026-06-15'), '2026-06-14');
+    assert.equal(getPreviousDate('2026-03-01'), '2026-02-28');
+    assert.equal(getPreviousDate('invalid'), null);
+});
+
 test('scoreTertile scores higher values higher by default', () => {
     const values = [10, 20, 30, 40, 50];
 
@@ -184,7 +191,7 @@ test('buildRfmClients scores segments from RFM history when period totals are sm
     assert.equal(yesterdayBuyer.monetaryScore, 3);
 });
 
-test('getRfmAnalytics calculates recency against selected range end date', async () => {
+test('getRfmAnalytics groups period buyers by their RFM tag before the selected period', async () => {
     const originalQuery = pool.query;
     const calls = [];
 
@@ -203,7 +210,7 @@ test('getRfmAnalytics calculates recency against selected range end date', async
                         frequency: 20,
                         quantity_purchased: 20,
                         last_purchase_date: '2026-06-14',
-                        recency_days: endDate === '2026-06-14' ? 0 : 1
+                        recency_days: endDate === '2026-06-13' ? 0 : 1
                     },
                     {
                         name: 'Cliente Antigo',
@@ -236,6 +243,14 @@ test('getRfmAnalytics calculates recency against selected range end date', async
                     frequency: 1,
                     quantity_purchased: 1,
                     last_purchase_date: '2026-06-14'
+                },
+                {
+                    name: 'Cliente Novo no Periodo',
+                    phone: '4',
+                    monetary: 25,
+                    frequency: 1,
+                    quantity_purchased: 1,
+                    last_purchase_date: '2026-06-14'
                 }
             ]
         };
@@ -248,17 +263,16 @@ test('getRfmAnalytics calculates recency against selected range end date', async
         assert.deepEqual(calls[0].params, ['2026-06-09', '2026-06-15']);
         assert.match(calls[1].sql, /\(\$1::date - MAX\(data_pedido_date\)\)::int/);
         assert.match(calls[1].sql, /data_pedido_date <= \$1::date/);
-        assert.deepEqual(calls[1].params, ['2026-06-15']);
+        assert.deepEqual(calls[1].params, ['2026-06-08']);
         assert.deepEqual(calls[2].params, ['2026-06-14', '2026-06-14']);
-        assert.deepEqual(calls[3].params, ['2026-06-14']);
+        assert.deepEqual(calls[3].params, ['2026-06-13']);
         assert.equal(sevenDays.clients[0].segmentKey, 'champions');
         assert.equal(yesterday.clients[0].segmentKey, 'champions');
-        assert.equal(yesterday.clients[0].recencyDays, 0);
         assert.equal(yesterday.clients[0].frequency, 1);
         assert.equal(yesterday.clients[0].monetary, 100);
-        assert.equal(yesterday.clients.length, 3);
-        assert.ok(yesterday.clients.some(client => client.recencyScore === 1));
-        assert.ok(yesterday.clients.some(client => client.phone === '2' && client.monetary === 0 && client.frequency === 0));
+        assert.equal(yesterday.clients.length, 2);
+        assert.ok(!yesterday.clients.some(client => client.phone === '2'));
+        assert.ok(yesterday.clients.some(client => client.phone === '4' && client.segmentKey === 'new_customers'));
     } finally {
         pool.query = originalQuery;
     }