diff --git a/src/Attributes/OverwriteRules.php b/src/Attributes/OverwriteRules.php
new file mode 100644
index 0000000..e1cee40
--- /dev/null
+++ b/src/Attributes/OverwriteRules.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Icefox\DTO\Attributes;
+
+use Attribute;
+
+#[Attribute(Attribute::TARGET_METHOD)]
+class OverwriteRules
+{
+}
diff --git a/src/DataObject.php b/src/DataObject.php
index cc2fcf3..5487e00 100644
--- a/src/DataObject.php
+++ b/src/DataObject.php
@@ -7,6 +7,7 @@ namespace Icefox\DTO;
 use Icefox\DTO\Attributes\FromInput;
 use Icefox\DTO\Attributes\CastWith;
 use Icefox\DTO\Attributes\FromRouteParameter;
+use Icefox\DTO\Attributes\OverwriteRules;
 use Icefox\DTO\Support\RuleFactory;
 use Icefox\DTO\Support\ValueFactory;
 use Illuminate\Http\Request;
@@ -66,7 +67,8 @@ trait DataObject
             }
         }
 
-        $rules = RuleFactory::buildRules($parameters, '');
+        $rules = static::getRules();
+
         $validator = static::withValidator($input, $rules);
 
         if ($validator->fails()) {
@@ -101,6 +103,42 @@ trait DataObject
         return [];
     }
 
+    /**
+     * @return array<string,array<int, string|Rule>>
+     */
+    public static function getRules(): array
+    {
+        $parameters = RuleFactory::getParametersMeta(static::class);
+        $customRules = static::rules();
+        $classReflection = new ReflectionClass(static::class);
+        $rulesMethod = $classReflection->getMethod('rules');
+
+        if (!empty($rulesMethod->getAttributes(OverwriteRules::class))) {
+            return $customRules;
+        }
+
+        $inferredRules = RuleFactory::infer($parameters, '');
+        return self::mergeRules($inferredRules, $customRules);
+    }
+
+    /**
+     * @param array<string,array<int, string|Rule>> $inferredRules
+     * @param array<string,array<int, string|Rule>> $customRules
+     * @return array<string,array<int, string|Rule>>
+     */
+    protected static function mergeRules(array $inferredRules, array $customRules): array
+    {
+        $merged = $inferredRules;
+        foreach ($customRules as $key => $rules) {
+            if (isset($merged[$key])) {
+                $merged[$key] = array_values(array_unique(array_merge($merged[$key], $rules)));
+            } else {
+                $merged[$key] = $rules;
+            }
+        }
+        return $merged;
+    }
+
     /**
      * @param array<string,mixed> $data
      * @param array<string,array<int, string|Rule>> $rules
diff --git a/src/Support/RuleFactory.php b/src/Support/RuleFactory.php
index a3572b6..db07382 100644
--- a/src/Support/RuleFactory.php
+++ b/src/Support/RuleFactory.php
@@ -60,7 +60,7 @@ class RuleFactory
             $paramsSub = self::getParametersMeta($type->getFqsen()->__toString());
             $rules = array_merge(
                 $rules,
-                self::buildRules($paramsSub, $prefix . '.'),
+                self::infer($paramsSub, $prefix . '.'),
             );
         }
         return $rules;
@@ -103,7 +103,7 @@ class RuleFactory
      * @param array<ParameterMeta> $parameters
      * @return array<string,array<int,string|Rule>>
      */
-    public static function buildRules(array $parameters, string $prefix): array
+    public static function infer(array $parameters, string $prefix): array
     {
         $rules = [];
         foreach ($parameters as $parameter) {
@@ -163,7 +163,7 @@ class RuleFactory
                 $paramsSub = self::getParametersMeta($type->getName());
                 $rules = array_merge(
                     $rules,
-                    self::buildRules($paramsSub, $root . '.'),
+                    self::infer($paramsSub, $root . '.'),
                 );
             }
         }
diff --git a/tests/DataObjectTest.php b/tests/DataObjectTest.php
index 1ed2ce4..4177c8b 100644
--- a/tests/DataObjectTest.php
+++ b/tests/DataObjectTest.php
@@ -2,12 +2,10 @@
 
 namespace Tests;
 
-use Icefox\DTO\Support\RuleFactory;
 use Illuminate\Validation\ValidationException;
 use Tests\Classes\ArrayDataObject;
 use Tests\Classes\CollectionDataObject;
 use Tests\Classes\FromInputObject;
-use Tests\Classes\ObjectWithoutMapper;
 use Tests\Classes\OptionalData;
 use Tests\Classes\OptionalNullableData;
 use Tests\Classes\PrimitiveData;
@@ -16,7 +14,7 @@ use Tests\Classes\WithMapperObject;
 
 describe('primitive data test', function () {
     it('creates required rules', function () {
-        $rules = RuleFactory::buildRules(RuleFactory::getParametersMeta(PrimitiveData::class), '');
+        $rules = PrimitiveData::getRules();
         expect($rules)->toMatchArray([
             'string' => ['required'],
             'int' => ['required', 'numeric'],
@@ -42,7 +40,7 @@ describe('primitive data test', function () {
 
 describe('optional data', function () {
     it('creates optional rules', function () {
-        $rules = RuleFactory::buildRules(RuleFactory::getParametersMeta(OptionalData::class), '');
+        $rules = OptionalData::getRules();
         expect($rules)->toMatchArray([
             'string' => ['sometimes'],
             'int' => ['sometimes', 'numeric'],
@@ -63,7 +61,7 @@ describe('optional data', function () {
 
 describe('nullable data', function () {
     it('creates nullable rules', function () {
-        $rules = RuleFactory::buildRules(RuleFactory::getParametersMeta(OptionalNullableData::class), '');
+        $rules = OptionalNullableData::getRules();
         expect($rules)->toMatchArray([
             'string' => ['required'],
             'int' => ['nullable', 'numeric'],
@@ -93,10 +91,7 @@ describe('nullable data', function () {
 describe('reference other DataObject', function () {
 
     it('creates recursive rules', function () {
-        $rules = RuleFactory::buildRules(
-            RuleFactory::getParametersMeta(RecursiveDataObject::class),
-            '',
-        );
+        $rules = RecursiveDataObject::getRules();
         expect($rules)->toMatchArray([
             'string' => ['required'],
             'extra.string' => ['required'],
@@ -109,7 +104,7 @@ describe('reference other DataObject', function () {
 
 describe('primitive array', function () {
     it('creates array rules', function () {
-        $rules = RuleFactory::buildRules(RuleFactory::getParametersMeta(ArrayDataObject::class), '');
+        $rules = ArrayDataObject::getRules();
         expect($rules)->toMatchArray([
             'values' => ['required', 'array'],
             'values.*' => ['required', 'numeric'],
@@ -120,10 +115,7 @@ describe('primitive array', function () {
 
 describe('object array', function () {
     it('creates array rules', function () {
-        $rules = RuleFactory::buildRules(
-            RuleFactory::getParametersMeta(CollectionDataObject::class),
-            '',
-        );
+        $rules = CollectionDataObject::getRules();
         expect($rules)->toMatchArray([
             'values' => ['required', 'array'],
             'values.*' => ['required'],
@@ -139,7 +131,7 @@ describe('can map input names', function () {
 
     it('creates rules with property names', function () {
 
-        $rules = RuleFactory::buildRules(RuleFactory::getParametersMeta(FromInputObject::class), '');
+        $rules = FromInputObject::getRules();
         expect($rules)->toMatchArray([
             'text' => ['required' ],
             'standard' => ['required', 'numeric'],
diff --git a/tests/Rules/RulesTest.php b/tests/Rules/RulesTest.php
new file mode 100644
index 0000000..19ad404
--- /dev/null
+++ b/tests/Rules/RulesTest.php
@@ -0,0 +1,120 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Rules;
+
+use Icefox\DTO\Support\RuleFactory;
+use Illuminate\Validation\ValidationException;
+use Tests\Rules\WithEmptyOverwriteRules;
+use Tests\Rules\WithMergedRules;
+use Tests\Rules\WithOverwriteRules;
+
+describe('rules array shape', function () {
+    it('returns inferred rules shape from RuleFactory::infer (inferred only)', function () {
+        $parameters = RuleFactory::getParametersMeta(WithMergedRules::class);
+        $rules = RuleFactory::infer($parameters, '');
+
+        expect($rules)->toBe([
+            'value' => ['required', 'numeric'],
+        ]);
+    });
+
+    it('returns inferred rules shape regardless of OverwriteRules attribute', function () {
+        $parameters = RuleFactory::getParametersMeta(WithOverwriteRules::class);
+        $rules = RuleFactory::infer($parameters, '');
+
+        expect($rules)->toBe([
+            'value' => ['required', 'numeric'],
+        ]);
+    });
+});
+
+describe('getRules method', function () {
+    it('returns merged rules from DataObject::getRules()', function () {
+        $rules = WithMergedRules::getRules();
+
+        expect($rules)->toBe([
+            'value' => ['required', 'numeric', 'max:20'],
+        ]);
+    });
+
+    it('returns only custom rules from DataObject::getRules() with OverwriteRules', function () {
+        $rules = WithOverwriteRules::getRules();
+
+        expect($rules)->toBe([
+            'value' => ['numeric', 'max:20'],
+        ]);
+    });
+
+    it('returns empty rules from DataObject::getRules() with OverwriteRules and no custom rules', function () {
+        $rules = WithEmptyOverwriteRules::getRules();
+
+        expect($rules)->toBe([]);
+    });
+});
+
+describe('rules merging', function () {
+    it('merges custom rules with inferred rules by default', function () {
+        $object = WithMergedRules::fromArray([
+            'value' => 10,
+        ]);
+
+        expect($object->value)->toBe(10);
+    });
+
+    it('fails validation when merged rule is violated', function () {
+        expect(fn() => WithMergedRules::fromArray([
+            'value' => 25,
+        ]))->toThrow(ValidationException::class);
+    });
+
+    it('fails validation when required rule is violated (inferred)', function () {
+        expect(fn() => WithMergedRules::fromArray([
+        ]))->toThrow(ValidationException::class);
+    });
+});
+
+describe('rules overwrite', function () {
+    it('uses only custom rules when OverwriteRules attribute is present', function () {
+        $object = WithOverwriteRules::fromArray([
+            'value' => 10,
+        ]);
+
+        expect($object->value)->toBe(10);
+    });
+
+    it('fails validation when custom rule is violated', function () {
+        expect(fn() => WithOverwriteRules::fromArray([
+            'value' => 25,
+        ]))->toThrow(ValidationException::class);
+    });
+
+    it('does not enforce inferred required rule when overwritten', function () {
+        $object = WithOverwriteRules::fromArray([]);
+
+        expect($object)->toBeInstanceOf(WithOverwriteRules::class);
+    });
+
+    it('does not enforce inferred numeric rule when overwritten', function () {
+        $rules = WithOverwriteRules::rules();
+        expect($rules)->toHaveKey('value');
+        expect($rules['value'])->toBe(['numeric', 'max:20']);
+    });
+});
+
+describe('empty rules overwrite', function () {
+    it('allows any value when rules are empty with OverwriteRules', function () {
+        $object = WithEmptyOverwriteRules::fromArray([
+            'value' => 999,
+        ]);
+
+        expect($object->value)->toBe(999);
+    });
+
+    it('allows missing value when rules are empty with OverwriteRules', function () {
+        $object = WithEmptyOverwriteRules::fromArray([]);
+
+        expect($object)->toBeInstanceOf(WithEmptyOverwriteRules::class);
+    });
+});
diff --git a/tests/Rules/WithEmptyOverwriteRules.php b/tests/Rules/WithEmptyOverwriteRules.php
new file mode 100644
index 0000000..e743bed
--- /dev/null
+++ b/tests/Rules/WithEmptyOverwriteRules.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Rules;
+
+use Icefox\DTO\Attributes\OverwriteRules;
+use Icefox\DTO\DataObject;
+
+readonly class WithEmptyOverwriteRules
+{
+    use DataObject;
+
+    public function __construct(
+        public int $value,
+    ) {}
+
+    #[OverwriteRules]
+    public static function rules(): array
+    {
+        return [];
+    }
+}
diff --git a/tests/Rules/WithMergedRules.php b/tests/Rules/WithMergedRules.php
new file mode 100644
index 0000000..9fd98b1
--- /dev/null
+++ b/tests/Rules/WithMergedRules.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Rules;
+
+use Icefox\DTO\DataObject;
+
+readonly class WithMergedRules
+{
+    use DataObject;
+
+    public function __construct(
+        public int $value,
+    ) {}
+
+    public static function rules(): array
+    {
+        return [
+            'value' => ['max:20'],
+        ];
+    }
+}
diff --git a/tests/Rules/WithOverwriteRules.php b/tests/Rules/WithOverwriteRules.php
new file mode 100644
index 0000000..21b2145
--- /dev/null
+++ b/tests/Rules/WithOverwriteRules.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Rules;
+
+use Icefox\DTO\Attributes\OverwriteRules;
+use Icefox\DTO\DataObject;
+
+readonly class WithOverwriteRules
+{
+    use DataObject;
+
+    public function __construct(
+        public int $value,
+    ) {}
+
+    #[OverwriteRules]
+    public static function rules(): array
+    {
+        return [
+            'value' => ['numeric', 'max:20'],
+        ];
+    }
+}