diff --git a/policyengine/tests/economic_impact/winners_and_losers/test_by_income_decile/by_income_decile.yaml b/policyengine/tests/economic_impact/winners_and_losers/test_by_income_decile/by_income_decile.yaml
new file mode 100644
index 0000000..1fa58c4
--- /dev/null
+++ b/policyengine/tests/economic_impact/winners_and_losers/test_by_income_decile/by_income_decile.yaml
@@ -0,0 +1,19 @@
+# Winners and Losers by income
+- income_impact_test:
+    reform:
+    gov.irs.credits.ctc.refundable.fully_refundable: 
+    "2024-01-01.2100-12-31": True
+    country: us
+    expected:
+       deciles:
+         Lose more than 5%: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
+         Lose less than 5%: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
+         No change: [82.9, 76.6, 78.3, 85.8, 89.9, 93.4, 94.7, 96.5, 96.9, 98.5]
+         Gain less than 5%: [0.7, 6.1, 8.2, 6.2, 4.6, 4.8, 3.7, 2.6, 2.7, 1.5]
+         Gain more than 5%: [16.4, 17.3, 13.4, 8.0, 5.5, 1.8, 1.6, 0.8, 0.5, 0.0]
+       all:
+         Lose more than 5%: 0.0
+         Lose less than 5%: 0.0
+         No change: 89.3
+         Gain less than 5%: 4.1
+         Gain more than 5%: 6.5
diff --git a/policyengine/tests/economic_impact/winners_and_losers/test_by_income_decile/test_by_income_decile.py b/policyengine/tests/economic_impact/winners_and_losers/test_by_income_decile/test_by_income_decile.py
new file mode 100644
index 0000000..6f05044
--- /dev/null
+++ b/policyengine/tests/economic_impact/winners_and_losers/test_by_income_decile/test_by_income_decile.py
@@ -0,0 +1,40 @@
+import pytest
+import yaml
+import os
+from policyengine import EconomicImpact
+
+def assert_dict_approx_equal(actual, expected, tolerance=1e-4):
+    if isinstance(expected, dict):
+        for key in expected:
+            assert_dict_approx_equal(actual[key], expected[key], tolerance)
+    elif isinstance(expected, list):
+        assert len(actual) == len(expected), f"List length mismatch: expected {len(expected)}, got {len(actual)}"
+        for a, e in zip(actual, expected):
+            assert abs(a - e) < tolerance, f"Expected {e}, got {a}"
+    else:
+        assert abs(actual - expected) < tolerance, f"Expected {expected}, got {actual}"
+
+yaml_file_path = "policyengine/tests/economic_impact/winners_and_losers/test_by_income_decile/by_income_decile.yaml"
+
+# Check if the file exists
+if not os.path.exists(yaml_file_path):
+    raise FileNotFoundError(f"The YAML file does not exist at: {yaml_file_path}")
+
+with open(yaml_file_path, 'r') as file:
+    test_cases = yaml.safe_load(file)
+
+@pytest.mark.parametrize("test_case", test_cases)
+def test_economic_impact(test_case):
+    test_name = list(test_case.keys())[0]
+    test_data = test_case[test_name]
+    
+    if test_name != 'income_impact_test':
+        pytest.skip(f"Skipping non-income test: {test_name}")
+    
+    economic_impact = EconomicImpact(test_data['reform'], test_data['country'])
+    result = economic_impact.calculate("winners_and_losers/by_income_decile")
+
+    assert_dict_approx_equal(result['result'], test_data['expected'])
+
+if __name__ == "__main__":
+    pytest.main([__file__])
\ No newline at end of file
diff --git a/policyengine/tests/economic_impact/winners_and_losers/test_by_wealth_decile/by_wealth_decile.yaml b/policyengine/tests/economic_impact/winners_and_losers/test_by_wealth_decile/by_wealth_decile.yaml
new file mode 100644
index 0000000..7c004e1
--- /dev/null
+++ b/policyengine/tests/economic_impact/winners_and_losers/test_by_wealth_decile/by_wealth_decile.yaml
@@ -0,0 +1,18 @@
+- wealth_impact_test:
+    reform:
+      gov.hmrc.income_tax.rates.uk[0].rate:
+        "2024-01-01.2100-12-31": 0.55
+    country: uk
+    expected:
+      deciles:
+        Lose more than 5%: [21.1, 31.6, 59.2, 64.3, 67.1, 80.1, 81.1, 82.6, 84.5, 86.4]
+        Lose less than 5%: [6.5, 9.7, 2.4, 2.0, 3.8, 0.8, 0.4, 2.6, 0.2, 1.2]
+        No change: [72.4, 58.7, 38.4, 33.6, 29.1, 19.1, 18.4, 14.8, 15.3, 12.4]
+        Gain less than 5%: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
+        Gain more than 5%: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
+      all:
+        Lose more than 5%: 65.8
+        Lose less than 5%: 3.0
+        No change: 31.2
+        Gain less than 5%: 0.0
+        Gain more than 5%: 0.0
\ No newline at end of file
diff --git a/policyengine/tests/economic_impact/winners_and_losers/test_by_wealth_decile/test_by_wealth_decile.py b/policyengine/tests/economic_impact/winners_and_losers/test_by_wealth_decile/test_by_wealth_decile.py
new file mode 100644
index 0000000..4c94bc3
--- /dev/null
+++ b/policyengine/tests/economic_impact/winners_and_losers/test_by_wealth_decile/test_by_wealth_decile.py
@@ -0,0 +1,40 @@
+import pytest
+import yaml
+import os
+from policyengine import EconomicImpact
+
+def assert_dict_approx_equal(actual, expected, tolerance=5e-2):
+    if isinstance(expected, dict):
+        for key in expected:
+            assert_dict_approx_equal(actual[key], expected[key], tolerance)
+    elif isinstance(expected, list):
+        assert len(actual) == len(expected), f"List length mismatch: expected {len(expected)}, got {len(actual)}"
+        for a, e in zip(actual, expected):
+            assert abs(a - e) < tolerance, f"Expected {e}, got {a}"
+    else:
+        assert abs(actual - expected) < tolerance, f"Expected {expected}, got {actual}"
+
+yaml_file_path = "policyengine/tests/economic_impact/winners_and_losers/test_by_wealth_decile/by_wealth_decile.yaml"
+
+# Check if the file exists
+if not os.path.exists(yaml_file_path):
+    raise FileNotFoundError(f"The YAML file does not exist at: {yaml_file_path}")
+
+with open(yaml_file_path, 'r') as file:
+    test_cases = yaml.safe_load(file)
+
+@pytest.mark.parametrize("test_case", test_cases)
+def test_economic_impact(test_case):
+    test_name = list(test_case.keys())[0]
+    test_data = test_case[test_name]
+    
+    if test_name != 'wealth_impact_test':
+        pytest.skip(f"Skipping non-wealth test: {test_name}")
+    
+    economic_impact = EconomicImpact(test_data['reform'], test_data['country'])
+    result = economic_impact.calculate("winners_and_losers/by_wealth_decile")
+
+    assert_dict_approx_equal(result['result'], test_data['expected'])
+
+if __name__ == "__main__":
+    pytest.main([__file__])
\ No newline at end of file