diff --git a/docker-compose.yml b/docker-compose.yml
index bf7afeb..baf308c 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -60,6 +60,9 @@ services:
       - "5175:3000"
     environment:
       NODE_ENV: development
+      # Vite runs inside this container, so localhost would refer to the
+      # frontend rather than the Python service.
+      BACKEND_URL: http://backend:8000
       AGENT_URL: http://backend:8000/api/v1/agent/agui
     depends_on:
       - backend
diff --git a/frontend/src/components/SalaryEntryDialog.tsx b/frontend/src/components/SalaryEntryDialog.tsx
new file mode 100644
index 0000000..d71993e
--- /dev/null
+++ b/frontend/src/components/SalaryEntryDialog.tsx
@@ -0,0 +1,177 @@
+import { useState } from 'react';
+import { toast } from 'sonner';
+
+import api from '@/lib/api';
+import { formatLocalDatetime } from '@/lib/format';
+import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
+import { Label } from '@/components/ui/label';
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from '@/components/ui/dialog';
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from '@/components/ui/select';
+import { Alert, AlertDescription } from '@/components/ui/alert';
+import { AlertCircle } from 'lucide-react';
+
+interface Props {
+  onClose: () => void;
+  onSaved: () => void;
+}
+
+export default function SalaryEntryDialog({ onClose, onSaved }: Props) {
+  const [form, setForm] = useState({
+    amount: '',
+    currency: 'CRC',
+    date: formatLocalDatetime(new Date()),
+    bank: 'BAC',
+    reference: '',
+    notes: '',
+  });
+  const [saving, setSaving] = useState(false);
+  const [error, setError] = useState('');
+
+  const handleSubmit = async (event: React.FormEvent) => {
+    event.preventDefault();
+    const amount = Number(form.amount);
+    if (!Number.isFinite(amount) || amount <= 0) {
+      setError('Ingresá un monto mayor que cero.');
+      return;
+    }
+
+    setSaving(true);
+    setError('');
+    try {
+      await api.post('/transactions/', {
+        amount,
+        currency: form.currency,
+        date: form.date,
+        bank: form.bank,
+        merchant: 'Salario',
+        transaction_type: 'SALARY',
+        source: 'TRANSFER',
+        reference: form.reference.trim() || null,
+        notes: form.notes.trim() || null,
+      });
+      toast.success('Salario registrado');
+      onSaved();
+      onClose();
+    } catch (err) {
+      const status = err && typeof err === 'object' && 'response' in err
+        ? (err as { response: { status: number } }).response.status
+        : null;
+      setError(
+        status === 409
+          ? 'Ya existe una transacción con ese comprobante.'
+          : 'No se pudo registrar el salario. Intentá de nuevo.',
+      );
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  return (
+    <Dialog open onOpenChange={(open) => { if (!open) onClose(); }}>
+      <DialogContent className="sm:max-w-md">
+        <DialogHeader>
+          <DialogTitle>Registrar salario</DialogTitle>
+          <DialogDescription>
+            Guardá el depósito recibido mientras configurás una nueva automatización.
+          </DialogDescription>
+        </DialogHeader>
+
+        <form onSubmit={handleSubmit} className="space-y-5">
+          {error && (
+            <Alert variant="destructive">
+              <AlertCircle className="h-4 w-4" />
+              <AlertDescription>{error}</AlertDescription>
+            </Alert>
+          )}
+
+          <div className="grid grid-cols-2 gap-4">
+            <div className="space-y-2">
+              <Label htmlFor="salary-amount">Monto</Label>
+              <Input
+                id="salary-amount"
+                type="number"
+                min="0.01"
+                step="0.01"
+                inputMode="decimal"
+                value={form.amount}
+                onChange={(e) => setForm({ ...form, amount: e.target.value })}
+                placeholder="0.00"
+                autoFocus
+                required
+              />
+            </div>
+            <div className="space-y-2">
+              <Label>Moneda</Label>
+              <Select value={form.currency} onValueChange={(value) => value && setForm({ ...form, currency: value })}>
+                <SelectTrigger><SelectValue /></SelectTrigger>
+                <SelectContent>
+                  <SelectItem value="CRC">CRC (₡)</SelectItem>
+                  <SelectItem value="USD">USD ($)</SelectItem>
+                  <SelectItem value="EUR">EUR (€)</SelectItem>
+                </SelectContent>
+              </Select>
+            </div>
+            <div className="col-span-2 space-y-2">
+              <Label htmlFor="salary-date">Fecha del depósito</Label>
+              <Input
+                id="salary-date"
+                type="datetime-local"
+                value={form.date}
+                onChange={(e) => setForm({ ...form, date: e.target.value })}
+                required
+              />
+            </div>
+            <div className="space-y-2">
+              <Label>Banco</Label>
+              <Select value={form.bank} onValueChange={(value) => value && setForm({ ...form, bank: value })}>
+                <SelectTrigger><SelectValue /></SelectTrigger>
+                <SelectContent>
+                  <SelectItem value="BAC">BAC</SelectItem>
+                  <SelectItem value="BCR">BCR</SelectItem>
+                  <SelectItem value="DAVIVIENDA">Davivienda</SelectItem>
+                </SelectContent>
+              </Select>
+            </div>
+            <div className="space-y-2">
+              <Label htmlFor="salary-reference">Comprobante</Label>
+              <Input
+                id="salary-reference"
+                value={form.reference}
+                onChange={(e) => setForm({ ...form, reference: e.target.value })}
+                placeholder="Opcional"
+              />
+            </div>
+            <div className="col-span-2 space-y-2">
+              <Label htmlFor="salary-notes">Nota</Label>
+              <Input
+                id="salary-notes"
+                value={form.notes}
+                onChange={(e) => setForm({ ...form, notes: e.target.value })}
+                placeholder="Ej. Quincena de julio"
+              />
+            </div>
+          </div>
+
+          <DialogFooter>
+            <Button type="button" variant="outline" onClick={onClose}>Cancelar</Button>
+            <Button type="submit" disabled={saving}>{saving ? 'Guardando…' : 'Registrar salario'}</Button>
+          </DialogFooter>
+        </form>
+      </DialogContent>
+    </Dialog>
+  );
+}
diff --git a/frontend/src/pages/Salarios.tsx b/frontend/src/pages/Salarios.tsx
index 2988c03..8024142 100644
--- a/frontend/src/pages/Salarios.tsx
+++ b/frontend/src/pages/Salarios.tsx
@@ -1,7 +1,7 @@
-import { useMemo } from 'react';
+import { useMemo, useState } from 'react';
 import { useQuery } from '@tanstack/react-query';
 import { type ColumnDef } from '@tanstack/react-table';
-import { Landmark, RefreshCw, Download } from 'lucide-react';
+import { Landmark, RefreshCw, Download, Plus } from 'lucide-react';
 
 import { type Transaction, getSalarios, getSalariosSummary } from '@/lib/api';
 import { formatAmount, formatDate } from '@/lib/format';
@@ -13,8 +13,10 @@ import { DataTableColumnHeader } from '@/components/ui/data-table-column-header'
 import { Card, CardContent } from '@/components/ui/card';
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
+import SalaryEntryDialog from '@/components/SalaryEntryDialog';
 
 export default function Salarios() {
+  const [entryOpen, setEntryOpen] = useState(false);
   const query = useQuery({
     queryKey: ['salarios'],
     queryFn: async () => {
@@ -95,6 +97,10 @@ export default function Salarios() {
         subtitle="Historial de depósitos salariales"
         actions={
           <>
+            <Button size="sm" onClick={() => setEntryOpen(true)}>
+              <Plus className="w-4 h-4 mr-2" aria-hidden="true" />
+              Registrar salario
+            </Button>
             <Button
               variant="outline"
               size="sm"
@@ -152,6 +158,12 @@ export default function Salarios() {
           </CardContent>
         </Card>
       )}
+      {entryOpen && (
+        <SalaryEntryDialog
+          onClose={() => setEntryOpen(false)}
+          onSaved={() => { void query.refetch(); }}
+        />
+      )}
     </div>
   );
 }
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index 769706f..6f8d971 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -3,6 +3,11 @@ import react from "@vitejs/plugin-react-oxc";
 import tailwindcss from "@tailwindcss/vite";
 import path from "path";
 
+// Browser requests arrive at Vite, which then proxies them to the backend.
+// Locally the backend is published on the host; Docker Compose supplies the
+// service hostname instead (see docker-compose.yml).
+const backendUrl = process.env.BACKEND_URL ?? "http://localhost:8001";
+
 export default defineConfig({
   plugins: [react(), tailwindcss()],
   resolve: {
@@ -19,7 +24,7 @@ export default defineConfig({
       },
       // All other API calls → Python backend
       "/api": {
-        target: "http://localhost:8001",
+        target: backendUrl,
         changeOrigin: true,
       },
     },