diff --git a/policyengine/constants.py b/policyengine/constants.py
index c6bca554..43351271 100644
--- a/policyengine/constants.py
+++ b/policyengine/constants.py
@@ -4,7 +4,6 @@
 from policyengine.utils.data_download import download
 
 # Datasets
-
 ENHANCED_FRS = "hf://policyengine/policyengine-uk-data/enhanced_frs_2022_23.h5"
 FRS = "hf://policyengine/policyengine-uk-data/frs_2022_23.h5"
 ENHANCED_CPS = "hf://policyengine/policyengine-us-data/enhanced_cps_2024.h5"
diff --git a/policyengine/outputs/macro/comparison/calculate_economy_comparison.py b/policyengine/outputs/macro/comparison/calculate_economy_comparison.py
index 6592c305..f53691f9 100644
--- a/policyengine/outputs/macro/comparison/calculate_economy_comparison.py
+++ b/policyengine/outputs/macro/comparison/calculate_economy_comparison.py
@@ -10,6 +10,7 @@
 from policyengine.outputs.macro.single.calculate_single_economy import (
     SingleEconomy,
 )
+from policyengine.utils.packages import get_country_package_version
 from typing import List, Dict
 
 
@@ -775,6 +776,7 @@ def uk_constituency_breakdown(
 
 
 class EconomyComparison(BaseModel):
+    country_package_version: str
     budget: BudgetaryImpact
     detailed_budget: DetailedBudgetaryImpact
     decile: DecileImpact
@@ -823,6 +825,7 @@ def calculate_economy_comparison(
         )
 
         return EconomyComparison(
+            country_package_version=get_country_package_version(country_id),
             budget=budgetary_impact_data,
             detailed_budget=detailed_budgetary_impact_data,
             decile=decile_impact_data,
diff --git a/policyengine/simulation.py b/policyengine/simulation.py
index 61f00acb..ecb794fc 100644
--- a/policyengine/simulation.py
+++ b/policyengine/simulation.py
@@ -181,7 +181,7 @@ def _initialise_simulation(
         time_period: TimePeriodType,
         region: RegionType,
         subsample: SubsampleType,
-    ):
+    ) -> CountrySimulation:
         macro = scope == "macro"
         _simulation_type: Type[CountrySimulation] = {
             "uk": {
diff --git a/policyengine/utils/packages.py b/policyengine/utils/packages.py
new file mode 100644
index 00000000..78a254f2
--- /dev/null
+++ b/policyengine/utils/packages.py
@@ -0,0 +1,28 @@
+from importlib.metadata import version
+
+
+def get_country_package_name(country_id: str) -> str:
+    if country_id in NON_STANDARD_COUNTRY_CODES:
+        return f"policyengine_{NON_STANDARD_COUNTRY_CODES[country_id]}"
+    if country_id in COUNTRY_IDS:
+        return f"policyengine_{country_id}"
+    raise ValueError(
+        f"Unsupported country ID: {country_id}. Supported IDs are: {COUNTRY_IDS}"
+    )
+
+
+def get_country_package_version(country_id: str) -> str:
+
+    package_name = get_country_package_name(country_id)
+    return version(package_name)
+
+
+COUNTRY_IDS = ["us", "uk", "ca", "il", "ng"]
+
+NON_STANDARD_COUNTRY_CODES = {
+    "ca": "canada",
+}
+
+COUNTRY_PACKAGES = [
+    get_country_package_name(country) for country in COUNTRY_IDS
+]
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/fixtures/utils/__init__.py b/tests/fixtures/utils/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/fixtures/utils/packages.py b/tests/fixtures/utils/packages.py
new file mode 100644
index 00000000..2877aef7
--- /dev/null
+++ b/tests/fixtures/utils/packages.py
@@ -0,0 +1,19 @@
+from policyengine.utils.packages import COUNTRY_PACKAGES
+import pytest
+from unittest.mock import patch
+
+MOCK_VERSION = "MOCK_VERSION"
+
+
+@pytest.fixture
+def patch_importlib_version():
+    def mock_version(package_name):
+        if package_name in COUNTRY_PACKAGES:
+            return MOCK_VERSION
+        else:
+            raise Exception(f"Package {package_name} not found")
+
+    with patch(
+        "policyengine.utils.packages.version", side_effect=mock_version
+    ) as mock:
+        yield mock
diff --git a/tests/utils/__init__.py b/tests/utils/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/utils/test_packages.py b/tests/utils/test_packages.py
new file mode 100644
index 00000000..822377b0
--- /dev/null
+++ b/tests/utils/test_packages.py
@@ -0,0 +1,54 @@
+import pytest
+from policyengine.utils.packages import (
+    get_country_package_name,
+    get_country_package_version,
+)
+from tests.fixtures.utils.packages import (
+    patch_importlib_version,
+    MOCK_VERSION,
+)
+
+
+class TestGetCountryPackageName:
+    def test__given_country_id__then_return_package_name(self):
+        test_country = "us"
+
+        test_package_name = get_country_package_name(test_country)
+
+        assert test_package_name == "policyengine_us"
+
+    def test__given_non_standard_country_id__then_return_package_name(self):
+        test_country = "ca"
+
+        test_package_name = get_country_package_name(test_country)
+
+        assert test_package_name == "policyengine_canada"
+
+    def test__given_unsupported_country_id__then_return_package_name(self):
+        test_country = "zz"
+
+        with pytest.raises(Exception, match="Unsupported country ID: zz"):
+            get_country_package_name(test_country)
+
+
+class TestGetCountryPackageVersion:
+    def test__given_package_exists__then_return_version(
+        self, patch_importlib_version
+    ):
+        test_country = "us"
+
+        test_version = get_country_package_version(test_country)
+
+        # Version number defined by mock
+        assert test_version == MOCK_VERSION
+
+    def test__given_package_does_not_exist__then_raise_exception(
+        self, patch_importlib_version
+    ):
+        test_country = "zz"
+
+        with pytest.raises(
+            Exception,
+            match=f"Unsupported country ID: {test_country}. Supported IDs are: ",
+        ):
+            get_country_package_version(test_country)