diff --git a/backend/app/Http/Controllers/ComprasController.php b/backend/app/Http/Controllers/ComprasController.php
new file mode 100644
index 0000000..2aabf04
--- /dev/null
+++ b/backend/app/Http/Controllers/ComprasController.php
@@ -0,0 +1,245 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Restaurante;
+use App\Models\Compra;
+use App\Models\Proveedor;
+use App\Models\Factura;
+use App\Models\Ingrediente;
+use App\Models\CompraIngrediente;
+use App\Services\PaginatorService;
+use App\Services\UuidService;
+use App\Exceptions\GenericException;
+use App\Exceptions\CantdeletehasChild;
+use App\Exceptions\AlreadyExistsException;
+use App\Exceptions\ModelNotFoundException;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Validation\ValidationException;
+use Ramsey\Uuid\Uuid;
+
+class ComprasController extends Controller {
+
+    /**
+     * Obtiene de forma paginada las compras registradas en el backend
+     */
+    public function all(Request $request, $restaurante_id) {
+        app(UuidService::class)->validOrFail($restaurante_id);
+        $restaurante = Restaurante::findOrFail($restaurante_id);
+
+        $compras = $restaurante->compras();
+
+        $paginate = app(PaginatorService::class)->paginate(
+            perPage: $request->input('per_page', 15),
+            page: $request->input('page', 1),
+            total: $compras->count(),
+            route: 'compras.all',
+            data: ['restaurante_id' => $restaurante_id]
+        );
+
+        $data = $compras->get()
+                         ->skip($paginate['from'] - 1)
+                         ->take($paginate['per_page'])
+                         ->all();
+
+        return response()->json([
+            'pagination' => $paginate,
+            'data' => $data
+        ]);
+    }
+
+    /**
+     * Obtiene una compra por su id
+     */
+    public function get(Request $request, $restaurante_id, $id) {
+        app(UuidService::class)->validOrFail($restaurante_id);
+        app(UuidService::class)->validOrFail($id);
+
+        $restaurante = Restaurante::findOrFail($restaurante_id);
+        $compra = Compra::findOrFail($id);
+
+        if($compra->restaurante != $restaurante) {
+            throw new ModelNotFoundException("compra", $id);
+        }
+
+        return response()->json($compra);
+    }
+
+    /**
+     * Crea una nueva compra
+     */
+    public function create(Request $request, $restaurante_id) {
+        $this->validate($request, [
+            'fecha_compra' => 'required|date',
+            'en_arqueo' => 'required|boolean',
+            'proveedor_id' => 'required'
+        ]);
+
+        app(UuidService::class)->validOrFail($restaurante_id);
+        app(UuidService::class)->validOrFail($request->input('proveedor_id'));
+
+        $restaurante = Restaurante::findOrFail($restaurante_id);
+        $proveedor = Proveedor::findOrFail($request->input('proveedor_id'));
+
+        if($proveedor->restaurante != $restaurante) {
+          throw new ModelNotFoundException("proveedor", $request->input('proveedor_id'));
+        }
+
+        $compra = Compra::create([
+            'id' => Uuid::uuid4(),
+            'fecha_compra' => $request->input('fecha_compra'),
+            'proveedor_id' => $proveedor->id,
+            'en_arqueo' => $request->input('en_arqueo'),
+            'restaurante_id' => $restaurante->id
+        ]);
+
+        return response()->json($compra, 201);
+    }
+
+    /**
+     * Actualiza una compra
+     */
+    public function update(Request $request, $restaurante_id, $id) {
+        $this->validate($request, [
+            'fecha_compra' => 'required|date',
+            'en_arqueo' => 'required|boolean',
+            'proveedor_id' => 'required'
+        ]);
+
+        app(UuidService::class)->validOrFail($restaurante_id);
+        app(UuidService::class)->validOrFail($id);
+        app(UuidService::class)->validOrFail($request->input('proveedor_id'));
+
+        $restaurante = Restaurante::findOrFail($restaurante_id);
+        $proveedor = Proveedor::findOrFail($request->input('proveedor_id'));
+        $compra = Compra::findOrFail($id);
+
+        if($proveedor->restaurante != $restaurante) {
+            throw new ModelNotFoundException("proveedor", $proveedor->id);
+        }
+
+        if($compra->restaurante != $restaurante) {
+            throw new ModelNotFoundException("compra", $compra->id);
+        }
+
+        $compra->fecha_compra= $request->input('fecha_compra');
+        $compra->en_arqueo = $request->input('en_arqueo');
+        $compra->proveedor_id = $proveedor->id;
+        $compra->save();
+
+        return response()->json($compra);
+    }
+
+    /**
+     * Elimina una compra
+     */
+    public function delete(Request $request, $restaurante_id, $id) {
+        app(UuidService::class)->validOrFail($restaurante_id);
+        app(UuidService::class)->validOrFail($id);
+
+        $restaurante = Restaurante::findOrFail($restaurante_id);
+        $compra = Compra::findOrFail($id);
+
+        if($compra->restaurante != $restaurante) {
+            throw new ModelNotFoundException("compra", $id);
+        }
+
+        $compra->ingredientes()->delete();
+        $compra->facturas()->delete();
+
+        $compra->delete();
+
+        return response()->json([], 204);
+    }
+
+    /**
+     * Obtiene los ingredientes de una compra
+     */
+    public function getIngredientes(Request $request, $restaurante_id, $id) {
+        app(UuidService::class)->validOrFail($restaurante_id);
+        app(UuidService::class)->validOrFail($id);
+
+        $restaurante = Restaurante::findOrFail($restaurante_id);
+        $compra = Compra::findOrFail($id);
+
+        if($compra->restaurante != $restaurante) {
+            throw new ModelNotFoundException("compra", $id);
+        }
+
+        return response()->json($compra->ingredientes);
+    }
+
+    /**
+     * Agrega un ingrediente a una compra
+     */
+    public function addIngrediente(Request $request, $restaurante_id, $id, $ingrediente_id) {
+        $this->validate($request, [
+            'unidades' => 'required|numeric',
+            'monto_unitario' => 'required|numeric'
+        ]);
+
+        app(UuidService::class)->validOrFail($restaurante_id);
+        app(UuidService::class)->validOrFail($id);
+        app(UuidService::class)->validOrFail($ingrediente_id);
+
+        $restaurante = Restaurante::findOrFail($restaurante_id);
+        $compra = Compra::findOrFail($id);
+        $ingrediente = Ingrediente::findOrFail($ingrediente_id);
+
+        if($compra->restaurante != $restaurante) {
+          throw new ModelNotFoundException("compra", $compra->id);
+        }
+
+        if($ingrediente->restaurante != $restaurante) {
+          throw new ModelNotFoundException("ingrediente", $ingrediente->id);
+        }
+
+        foreach($compra->ingredientes as $ci){
+            if($ci->ingrediente->id == $ingrediente->id) {
+                throw new AlreadyExistsException("ingrediente");
+            }
+        }
+
+        $compraIngrediente = CompraIngrediente::create([
+            'id' => Uuid::uuid4(),
+            'unidades' => $request->input('unidades'),
+            'monto_unitario' => $request->input('monto_unitario'),
+            'compra_id' => $compra->id,
+            'ingrediente_id' => $ingrediente->id
+        ]);
+
+        return response()->json($compraIngrediente, 201);
+    }
+
+    /**
+     * Elimina un ingrediente de una compra
+     */
+    public function deleteIngrediente(Request $request, $restaurante_id, $id, $ingrediente_id) {
+        app(UuidService::class)->validOrFail($restaurante_id);
+        app(UuidService::class)->validOrFail($id);
+        app(UuidService::class)->validOrFail($ingrediente_id);
+
+        $restaurante = Restaurante::findOrFail($restaurante_id);
+        $compra = Compra::findOrFail($id);
+        $ingrediente = Ingrediente::findOrFail($ingrediente_id);
+
+        if($compra->restaurante != $restaurante) {
+          throw new ModelNotFoundException("compra", $compra->id);
+        }
+
+        if($ingrediente->restaurante != $restaurante) {
+          throw new ModelNotFoundException("ingrediente", $ingrediente->id);
+        }
+
+        $toDelete = CompraIngrediente::where('compra_id', $compra->id)->where('ingrediente_id', $ingrediente->id);
+
+        if($toDelete->count() == 0) { 
+          throw new ModelNotFoundException("compra_ingrediente", null);
+        }
+
+        $toDelete->delete();
+
+        return response()->json([], 204);
+    }
+}
diff --git a/backend/app/Http/Controllers/FacturasController.php b/backend/app/Http/Controllers/FacturasController.php
new file mode 100644
index 0000000..b78936f
--- /dev/null
+++ b/backend/app/Http/Controllers/FacturasController.php
@@ -0,0 +1,131 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Restaurante;
+use App\Models\Compra;
+use App\Models\Proveedor;
+use App\Models\Factura;
+use App\Services\PaginatorService;
+use App\Services\UuidService;
+use App\Exceptions\GenericException;
+use App\Exceptions\CantdeletehasChild;
+use App\Exceptions\AlreadyExistsException;
+use App\Exceptions\ModelNotFoundException;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Validation\ValidationException;
+use Ramsey\Uuid\Uuid;
+
+class FacturasController extends Controller {
+
+    /**
+     * Obtiene la factura de una compra
+     */
+    public function get(Request $request, $restaurante_id, $id) {
+        app(UuidService::class)->validOrFail($restaurante_id);
+        app(UuidService::class)->validOrFail($id);
+
+        $restaurante = Restaurante::findOrFail($restaurante_id);
+        $compra = Compra::findOrFail($id);
+
+        if($compra->restaurante != $restaurante) {
+            throw new ModelNotFoundException("compra", $id);
+        }
+
+        if($compra->facturas()->count() == 0) {
+            throw new ModelNotFoundException("factura", null);
+        }
+
+        return response()->json($compra->facturas()->first());
+    }
+
+    /**
+     * Crea una factura a una compra
+     */
+    public function create(Request $request, $restaurante_id, $id) {
+        $this->validate($request, [
+            'numero' => 'required',
+            'monto_bruto' => 'required|numeric',
+        ]);
+
+        app(UuidService::class)->validOrFail($restaurante_id);
+        app(UuidService::class)->validOrFail($id);
+
+        $restaurante = Restaurante::findOrFail($restaurante_id);
+        $compra = Compra::findOrFail($id);
+
+        if($compra->restaurante != $restaurante) {
+            throw new ModelNotFoundException("compra", $id);
+        }
+
+        if($compra->facturas()->count() > 0) {
+            throw new AlreadyExistsException("factura");
+        }
+
+        $factura = Factura::create([
+            'id' => Uuid::uuid4(),
+            'numero' => $request->input('numero'),
+            'monto_bruto' => $request->input('monto_bruto'),
+            'compra_id' => $compra->id
+        ]);
+
+        return response()->json($factura, 201);
+    }
+
+    /**
+     * Modifica la factura a una compra
+     */
+    public function update(Request $request, $restaurante_id, $id) {
+        $this->validate($request, [
+            'numero' => 'required',
+            'monto_bruto' => 'required|numeric',
+        ]);
+
+        app(UuidService::class)->validOrFail($restaurante_id);
+        app(UuidService::class)->validOrFail($id);
+
+        $restaurante = Restaurante::findOrFail($restaurante_id);
+        $compra = Compra::findOrFail($id);
+
+        if($compra->restaurante != $restaurante) {
+            throw new ModelNotFoundException("compra", $id);
+        }
+
+        if($compra->facturas()->count() == 0) {
+            throw new ModelNotFoundException("factura", null);
+        }
+
+        $factura = $compra->facturas()->first();
+        $factura->numero = $request->input('numero');
+        $factura->monto_bruto = $request->input('monto_bruto');
+        $factura->save();
+
+        return response()->json($factura, 201);
+    }
+
+    
+    /**
+     * Elimina la factura de una compra
+     */
+    public function delete(Request $request, $restaurante_id, $id) {
+        app(UuidService::class)->validOrFail($restaurante_id);
+        app(UuidService::class)->validOrFail($id);
+
+        $restaurante = Restaurante::findOrFail($restaurante_id);
+        $compra = Compra::findOrFail($id);
+
+        if($compra->restaurante != $restaurante) {
+            throw new ModelNotFoundException("compra", $id);
+        }
+
+        if($compra->facturas()->count() == 0) {
+            throw new ModelNotFoundException("factura", null);
+        }
+
+        $factura = $compra->facturas()->first();
+        $factura->delete();
+
+        return response()->json([], 204);
+    }
+}
diff --git a/backend/app/Models/Compra.php b/backend/app/Models/Compra.php
index 575a4bf..4097bad 100644
--- a/backend/app/Models/Compra.php
+++ b/backend/app/Models/Compra.php
@@ -11,8 +11,17 @@ class Compra extends Model {
     use UuidPrimaryKey, SoftDeletes;
 
     protected $table = 'compras';
+    protected $fillable = [
+        'id', 'fecha_compra', 'proveedor_id', 'en_arqueo', 'restaurante_id'
+    ];
 
-    public function compraIngredientes() {
+    public static function findOrFail($id) {
+        $compra = Compra::find($id);
+        if(!$compra) throw new ModelNotFoundException("compra", $id);
+        return $compra;
+    }
+
+    public function ingredientes() {
         return $this->hasMany(CompraIngrediente::class);
     }
 
diff --git a/backend/app/Models/CompraIngrediente.php b/backend/app/Models/CompraIngrediente.php
index ce2907f..e2135cc 100644
--- a/backend/app/Models/CompraIngrediente.php
+++ b/backend/app/Models/CompraIngrediente.php
@@ -11,6 +11,7 @@ class CompraIngrediente extends Model {
     use UuidPrimaryKey, SoftDeletes;
 
     protected $table = 'compra_ingredientes';
+    protected $fillable = ['id', 'unidades', 'monto_unitario', 'compra_id', 'ingrediente_id'];
 
     public function ingrediente() {
         return $this->belongsTo(Ingrediente::class);
diff --git a/backend/app/Models/Factura.php b/backend/app/Models/Factura.php
index a4f7550..531b5d7 100644
--- a/backend/app/Models/Factura.php
+++ b/backend/app/Models/Factura.php
@@ -11,6 +11,13 @@ class Factura extends Model {
     use UuidPrimaryKey, SoftDeletes;
 
     protected $table = 'facturas';
+    protected $fillable = ['id', 'numero', 'monto_bruto', 'compra_id'];
+
+    public static function findOrFail($id) {
+        $factura = Factura::find($id);
+        if(!$factura) throw new ModelNotFoundException("factura", $id);
+        return $factura;
+    }
 
     public function compra() {
         return $this->belongsTo(Compra::class);
diff --git a/backend/app/Models/Restaurante.php b/backend/app/Models/Restaurante.php
index d1ca84a..2e484ca 100644
--- a/backend/app/Models/Restaurante.php
+++ b/backend/app/Models/Restaurante.php
@@ -2,13 +2,6 @@
 
 namespace App\Models;
 
-use App\Models\CanalVenta;
-use App\Models\Sector;
-use App\Models\ZonaProduccion;
-use App\Models\Categoria;
-use App\Models\Proveedor;
-use App\Models\Ingrediente;
-use App\Models\Producto;
 use App\Traits\UuidPrimaryKey;
 use App\Exceptions\ModelNotFoundException;
 use Illuminate\Database\Eloquent\Model;
@@ -60,4 +53,8 @@ class Restaurante extends Model {
     public function productos() {
         return $this->hasMany(Producto::class, 'restaurante_id');
     }
+
+    public function compras() {
+        return $this->hasMany(Compra::class, 'restaurante_id');
+    }
 }
diff --git a/backend/routes/web.php b/backend/routes/web.php
index ce37526..ecbdf75 100644
--- a/backend/routes/web.php
+++ b/backend/routes/web.php
@@ -72,5 +72,20 @@ $router->group(['prefix' => 'api/v1', 'middleware' => ['auth', 'log_endpoint']],
         $router->post(  '/{restaurante_id}/productos/{producto_id}/ingredientes/{ingrediente_id}', ['as' => 'productos.receta.add_ingrediente',    'uses' => 'RecetasController@create']);
         $router->put(   '/{restaurante_id}/productos/{producto_id}/ingredientes/{ingrediente_id}', ['as' => 'productos.receta.update_ingrediente', 'uses' => 'RecetasController@update']);
         $router->delete('/{restaurante_id}/productos/{producto_id}/ingredientes/{ingrediente_id}', ['as' => 'productos.receta.remove_ingrediente', 'uses' => 'RecetasController@delete']);
+
+        $router->get(   '/{restaurante_id}/compras',                                    ['as' => 'compras.all',                 'uses' => 'ComprasController@all']);
+        $router->get(   '/{restaurante_id}/compras/{id}',                               ['as' => 'compras.get',                 'uses' => 'ComprasController@get']);
+        $router->post(  '/{restaurante_id}/compras',                                    ['as' => 'compras.create',              'uses' => 'ComprasController@create']);
+        $router->put(   '/{restaurante_id}/compras/{id}',                               ['as' => 'compras.update',              'uses' => 'ComprasController@update']);
+        $router->delete('/{restaurante_id}/compras/{id}',                               ['as' => 'compras.delete',              'uses' => 'ComprasController@delete']);
+
+        $router->get(   '/{restaurante_id}/compras/{id}/ingredientes',                  ['as' => 'compras.ingredientes.get',    'uses' => 'ComprasController@getIngredientes']);
+        $router->post(  '/{restaurante_id}/compras/{id}/ingredientes/{ingrediente_id}', ['as' => 'compras.ingredientes.add',    'uses' => 'ComprasController@addIngrediente']);
+        $router->delete('/{restaurante_id}/compras/{id}/ingredientes/{ingrediente_id}', ['as' => 'compras.ingredientes.delete', 'uses' => 'ComprasController@deleteIngrediente']);
+
+        $router->get(   '/{restaurante_id}/compras/{id}/factura', ['as' => 'factura.get',    'uses' => 'FacturasController@get']);
+        $router->post(  '/{restaurante_id}/compras/{id}/factura', ['as' => 'factura.create', 'uses' => 'FacturasController@create']);
+        $router->put(   '/{restaurante_id}/compras/{id}/factura', ['as' => 'factura.update', 'uses' => 'FacturasController@update']);
+        $router->delete('/{restaurante_id}/compras/{id}/factura', ['as' => 'factura.delete', 'uses' => 'FacturasController@delete']);
     });
 });
diff --git a/database/init/00-schema.sql b/database/init/00-schema.sql
index 4f419b6..a42c740 100644
--- a/database/init/00-schema.sql
+++ b/database/init/00-schema.sql
@@ -183,31 +183,25 @@ create table compras
 
 create table facturas
 (
-    id                uuid primary key     default gen_random_uuid(),
-    numero            text        not null,
-    monto_bruto       bigint      not null,
-    iva               bigint      not null default 0,
-    ila               bigint      not null default 0,
-    monto_neto        bigint      not null,
-    fecha_emision     date        not null,
-    fecha_vencimiento date        not null,
-    compra_id         uuid references compras,
-    created_at        timestamptz not null default current_timestamp,
-    updated_at        timestamptz not null default current_timestamp,
-    deleted_at        timestamptz
+    id          uuid primary key     default gen_random_uuid(),
+    numero      text        not null,
+    monto_bruto bigint      not null,
+    compra_id   uuid references compras,
+    created_at  timestamptz not null default current_timestamp,
+    updated_at  timestamptz not null default current_timestamp,
+    deleted_at  timestamptz
 );
 
 create table compra_ingredientes
 (
-    id                   uuid primary key     default gen_random_uuid(),
-    unidades             numeric     not null,
-    monto_unitario_bruto bigint      not null,
-    monto_unitario_neto  bigint      not null,
-    compra_id            uuid references compras,
-    ingrediente_id       uuid references ingredientes,
-    created_at           timestamptz not null default current_timestamp,
-    updated_at           timestamptz not null default current_timestamp,
-    deleted_at           timestamptz
+    id             uuid primary key     default gen_random_uuid(),
+    unidades       numeric     not null,
+    monto_unitario bigint      not null,
+    compra_id      uuid references compras,
+    ingrediente_id uuid references ingredientes,
+    created_at     timestamptz not null default current_timestamp,
+    updated_at     timestamptz not null default current_timestamp,
+    deleted_at     timestamptz
 );
 
 create table sectores
diff --git a/database/modifications/03-simplify-facturas.sql b/database/modifications/03-simplify-facturas.sql
new file mode 100644
index 0000000..fab4bb3
--- /dev/null
+++ b/database/modifications/03-simplify-facturas.sql
@@ -0,0 +1,8 @@
+alter table facturas drop column iva;
+alter table facturas drop column ila;
+alter table facturas drop column monto_neto;
+alter table facturas drop column fecha_emision;
+alter table facturas drop column fecha_vencimiento;
+
+alter table compra_ingredientes rename column monto_unitario_bruto to monto_unitario;
+alter table compra_ingredientes drop column monto_unitario_neto;
\ No newline at end of file