diff --git a/Sources/PediFoods/Services/LocationService.swift b/Sources/PediFoods/Services/LocationService.swift
index 11cd212..43d177e 100644
--- a/Sources/PediFoods/Services/LocationService.swift
+++ b/Sources/PediFoods/Services/LocationService.swift
@@ -75,6 +75,39 @@ final class LocationService: NSObject {
 #endif
     }
 
+    /// Forward-geocodes a street address into coordinates. Used as a fallback
+    /// when a saved CustomerAddress has no lat/long (e.g. the CEP lookup at
+    /// creation time didn't return coordinates) — without this, delivery fee
+    /// validation silently can't distinguish that address from any other.
+    static func geocodeAddress(
+        street: String?,
+        number: String?,
+        neighborhood: String?,
+        city: String?,
+        state: String?,
+        zip: String?
+    ) async -> (Double, Double)? {
+#if os(iOS)
+        let parts = [street, number, neighborhood, city, state, zip]
+            .compactMap { $0?.trimmingCharacters(in: .whitespacesAndNewlines) }
+            .filter { $0.isEmpty == false }
+        guard parts.isEmpty == false else { return nil }
+        let fullAddress = parts.joined(separator: ", ")
+
+        return await withCheckedContinuation { continuation in
+            CLGeocoder().geocodeAddressString(fullAddress) { placemarks, error in
+                guard error == nil, let coordinate = placemarks?.first?.location?.coordinate else {
+                    continuation.resume(returning: nil)
+                    return
+                }
+                continuation.resume(returning: (coordinate.latitude, coordinate.longitude))
+            }
+        }
+#else
+        return nil
+#endif
+    }
+
     func requestLocationAsync(timeoutSeconds: TimeInterval = 8) async -> (Double, Double)? {
         await withCheckedContinuation { continuation in
             var hasResumed = false
diff --git a/Sources/PediFoods/Views/Main/CartView.swift b/Sources/PediFoods/Views/Main/CartView.swift
index d104ae3..00e93aa 100644
--- a/Sources/PediFoods/Views/Main/CartView.swift
+++ b/Sources/PediFoods/Views/Main/CartView.swift
@@ -349,8 +349,29 @@ struct CartView: View {
                 SessionStateStore.saveAddress(appState.address)
             }
 
-            let payloadLat = appState.address.latitude ?? selectedCustomerAddress?.latLong?.first
-            let payloadLng = appState.address.longitude ?? selectedCustomerAddress?.latLong?.dropFirst().first
+            var payloadLat = appState.address.latitude ?? selectedCustomerAddress?.latLong?.first
+            var payloadLng = appState.address.longitude ?? selectedCustomerAddress?.latLong?.dropFirst().first
+
+            // Some saved addresses have no lat/long (CEP lookup at creation
+            // time didn't return coordinates). Without coordinates the
+            // backend can't tell this address apart from any other, so the
+            // fee silently never changes. Geocode locally as a fallback.
+            if payloadLat == nil || payloadLng == nil {
+                if let coordinate = await LocationService.geocodeAddress(
+                    street: selectedCustomerAddress?.address,
+                    number: selectedCustomerAddress?.number,
+                    neighborhood: selectedCustomerAddress?.neighborhood,
+                    city: selectedCustomerAddress?.city,
+                    state: selectedCustomerAddress?.state,
+                    zip: selectedCustomerAddress?.zipCode
+                ) {
+                    payloadLat = coordinate.0
+                    payloadLng = coordinate.1
+                    appState.address.latitude = coordinate.0
+                    appState.address.longitude = coordinate.1
+                    SessionStateStore.saveAddress(appState.address)
+                }
+            }
 
             let payload = ValidateDeliveryAddressPayload(
                 address: ValidateDeliveryAddressDataPayload(
diff --git a/Sources/PediFoods/Views/Main/CheckoutView+Logic.swift b/Sources/PediFoods/Views/Main/CheckoutView+Logic.swift
index 035c256..21151f3 100644
--- a/Sources/PediFoods/Views/Main/CheckoutView+Logic.swift
+++ b/Sources/PediFoods/Views/Main/CheckoutView+Logic.swift
@@ -164,6 +164,25 @@ extension CheckoutView {
 
         baseDeliveryFee = nil
 
+        // Some saved addresses have no lat/long (CEP lookup at creation time
+        // didn't return coordinates). Without coordinates the backend can't
+        // tell this address apart from any other, so the fee silently never
+        // changes. Geocode locally as a fallback before validating.
+        if appState.address.latitude == nil || appState.address.longitude == nil {
+            if let coordinate = await LocationService.geocodeAddress(
+                street: selectedCustomerAddress?.address,
+                number: selectedCustomerAddress?.number,
+                neighborhood: selectedCustomerAddress?.neighborhood,
+                city: selectedCustomerAddress?.city,
+                state: selectedCustomerAddress?.state,
+                zip: selectedCustomerAddress?.zipCode
+            ) {
+                appState.address.latitude = coordinate.0
+                appState.address.longitude = coordinate.1
+                SessionStateStore.saveAddress(appState.address)
+            }
+        }
+
         let payload = ValidateDeliveryAddressPayload(
             address: ValidateDeliveryAddressDataPayload(
                 street: selectedCustomerAddress?.address,