diff --git a/.github/workflows/push.yaml b/.github/workflows/push.yaml
index f8add96e..9cf4a8cf 100644
--- a/.github/workflows/push.yaml
+++ b/.github/workflows/push.yaml
@@ -43,13 +43,10 @@ jobs:
           author_name: Github Actions[bot]
           message: Update PolicyEngine Core
   Test:
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     if: |
       (github.repository == 'PolicyEngine/policyengine-core')
       && (github.event.head_commit.message == 'Update PolicyEngine Core')
-    strategy:
-      matrix:
-        os: [ubuntu-latest, windows-latest]
     steps:
       - name: Checkout repo
         uses: actions/checkout@v3
diff --git a/test.ipynb b/test.ipynb
new file mode 100644
index 00000000..27c0bb53
--- /dev/null
+++ b/test.ipynb
@@ -0,0 +1,491 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from policyengine_uk import Microsimulation\n",
+    "from policyengine_core.reforms import Reform\n",
+    "\n",
+    "reform = Reform.from_dict({\n",
+    "  \"gov.hmrc.vat.standard_rate\": {\n",
+    "    \"2024-01-01.2100-12-31\": 0.22\n",
+    "  }\n",
+    "}, country_id=\"uk\")\n",
+    "\n",
+    "\n",
+    "baseline = Microsimulation()\n",
+    "reformed = Microsimulation(reform=reform)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div>\n",
+       "<style scoped>\n",
+       "    .dataframe tbody tr th:only-of-type {\n",
+       "        vertical-align: middle;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe tbody tr th {\n",
+       "        vertical-align: top;\n",
+       "    }\n",
+       "\n",
+       "    .dataframe thead th {\n",
+       "        text-align: right;\n",
+       "    }\n",
+       "</style>\n",
+       "<table border=\"1\" class=\"dataframe\">\n",
+       "  <thead>\n",
+       "    <tr style=\"text-align: right;\">\n",
+       "      <th></th>\n",
+       "      <th>age</th>\n",
+       "      <th>vat</th>\n",
+       "      <th>consumption</th>\n",
+       "      <th>full_rate_vat_expenditure_rate</th>\n",
+       "      <th>food_and_non_alcoholic_beverages_consumption</th>\n",
+       "      <th>alcohol_and_tobacco_consumption</th>\n",
+       "      <th>clothing_and_footwear_consumption</th>\n",
+       "      <th>housing_water_and_electricity_consumption</th>\n",
+       "      <th>household_furnishings_consumption</th>\n",
+       "      <th>health_consumption</th>\n",
+       "      <th>transport_consumption</th>\n",
+       "      <th>communication_consumption</th>\n",
+       "      <th>recreation_consumption</th>\n",
+       "      <th>education_consumption</th>\n",
+       "      <th>restaurants_and_hotels_consumption</th>\n",
+       "      <th>miscellaneous_consumption</th>\n",
+       "      <th>petrol_spending</th>\n",
+       "      <th>diesel_spending</th>\n",
+       "      <th>domestic_energy_consumption</th>\n",
+       "    </tr>\n",
+       "  </thead>\n",
+       "  <tbody>\n",
+       "    <tr>\n",
+       "      <th>312</th>\n",
+       "      <td>80.0</td>\n",
+       "      <td>-929.965881</td>\n",
+       "      <td>2118.353027</td>\n",
+       "      <td>-0.841608</td>\n",
+       "      <td>1270.274780</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>614.104309</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.00000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>187.915909</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>46.057823</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>283.716187</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1039</th>\n",
+       "      <td>80.0</td>\n",
+       "      <td>-129.693314</td>\n",
+       "      <td>-1217.768799</td>\n",
+       "      <td>0.194851</td>\n",
+       "      <td>85.360497</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>-1903.723389</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.00000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>291.699554</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>308.894470</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>666.303162</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1040</th>\n",
+       "      <td>52.0</td>\n",
+       "      <td>-129.693314</td>\n",
+       "      <td>-1217.768799</td>\n",
+       "      <td>0.194851</td>\n",
+       "      <td>85.360497</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>-1903.723389</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.00000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>291.699554</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>308.894470</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>666.303162</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1896</th>\n",
+       "      <td>80.0</td>\n",
+       "      <td>-593.512024</td>\n",
+       "      <td>1351.950684</td>\n",
+       "      <td>-0.841608</td>\n",
+       "      <td>461.806427</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>666.917297</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.00000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>187.915909</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>35.310997</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>354.338196</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>2057</th>\n",
+       "      <td>35.0</td>\n",
+       "      <td>-40.791981</td>\n",
+       "      <td>-1168.026367</td>\n",
+       "      <td>0.058855</td>\n",
+       "      <td>692.402588</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>-2319.164795</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>30.09111</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>187.915909</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>240.728882</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>-2926.207031</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>209307</th>\n",
+       "      <td>50.0</td>\n",
+       "      <td>-9.732808</td>\n",
+       "      <td>-125.584320</td>\n",
+       "      <td>0.139750</td>\n",
+       "      <td>131.418320</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>-424.346069</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.00000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.000000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>167.343414</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.000000</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>209308</th>\n",
+       "      <td>49.0</td>\n",
+       "      <td>-9.732808</td>\n",
+       "      <td>-125.584320</td>\n",
+       "      <td>0.139750</td>\n",
+       "      <td>131.418320</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>-424.346069</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.00000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.000000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>167.343414</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.000000</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>209309</th>\n",
+       "      <td>13.0</td>\n",
+       "      <td>-9.732808</td>\n",
+       "      <td>-125.584320</td>\n",
+       "      <td>0.139750</td>\n",
+       "      <td>131.418320</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>-424.346069</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.00000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.000000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>167.343414</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.000000</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>212169</th>\n",
+       "      <td>68.0</td>\n",
+       "      <td>-23.210276</td>\n",
+       "      <td>-378.288330</td>\n",
+       "      <td>0.109076</td>\n",
+       "      <td>1337.519165</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>-1903.723389</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.00000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>187.915909</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.000000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>638.054382</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>212170</th>\n",
+       "      <td>65.0</td>\n",
+       "      <td>-23.210276</td>\n",
+       "      <td>-378.288330</td>\n",
+       "      <td>0.109076</td>\n",
+       "      <td>1337.519165</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>-1903.723389</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.00000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>187.915909</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.000000</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>0.0</td>\n",
+       "      <td>638.054382</td>\n",
+       "    </tr>\n",
+       "  </tbody>\n",
+       "</table>\n",
+       "<p>464 rows × 19 columns</p>\n",
+       "</div>"
+      ],
+      "text/plain": [
+       "         age         vat  consumption  full_rate_vat_expenditure_rate  \\\n",
+       "312     80.0 -929.965881  2118.353027                       -0.841608   \n",
+       "1039    80.0 -129.693314 -1217.768799                        0.194851   \n",
+       "1040    52.0 -129.693314 -1217.768799                        0.194851   \n",
+       "1896    80.0 -593.512024  1351.950684                       -0.841608   \n",
+       "2057    35.0  -40.791981 -1168.026367                        0.058855   \n",
+       "...      ...         ...          ...                             ...   \n",
+       "209307  50.0   -9.732808  -125.584320                        0.139750   \n",
+       "209308  49.0   -9.732808  -125.584320                        0.139750   \n",
+       "209309  13.0   -9.732808  -125.584320                        0.139750   \n",
+       "212169  68.0  -23.210276  -378.288330                        0.109076   \n",
+       "212170  65.0  -23.210276  -378.288330                        0.109076   \n",
+       "\n",
+       "        food_and_non_alcoholic_beverages_consumption  \\\n",
+       "312                                      1270.274780   \n",
+       "1039                                       85.360497   \n",
+       "1040                                       85.360497   \n",
+       "1896                                      461.806427   \n",
+       "2057                                      692.402588   \n",
+       "...                                              ...   \n",
+       "209307                                    131.418320   \n",
+       "209308                                    131.418320   \n",
+       "209309                                    131.418320   \n",
+       "212169                                   1337.519165   \n",
+       "212170                                   1337.519165   \n",
+       "\n",
+       "        alcohol_and_tobacco_consumption  clothing_and_footwear_consumption  \\\n",
+       "312                                 0.0                                0.0   \n",
+       "1039                                0.0                                0.0   \n",
+       "1040                                0.0                                0.0   \n",
+       "1896                                0.0                                0.0   \n",
+       "2057                                0.0                                0.0   \n",
+       "...                                 ...                                ...   \n",
+       "209307                              0.0                                0.0   \n",
+       "209308                              0.0                                0.0   \n",
+       "209309                              0.0                                0.0   \n",
+       "212169                              0.0                                0.0   \n",
+       "212170                              0.0                                0.0   \n",
+       "\n",
+       "        housing_water_and_electricity_consumption  \\\n",
+       "312                                    614.104309   \n",
+       "1039                                 -1903.723389   \n",
+       "1040                                 -1903.723389   \n",
+       "1896                                   666.917297   \n",
+       "2057                                 -2319.164795   \n",
+       "...                                           ...   \n",
+       "209307                                -424.346069   \n",
+       "209308                                -424.346069   \n",
+       "209309                                -424.346069   \n",
+       "212169                               -1903.723389   \n",
+       "212170                               -1903.723389   \n",
+       "\n",
+       "        household_furnishings_consumption  health_consumption  \\\n",
+       "312                                   0.0                 0.0   \n",
+       "1039                                  0.0                 0.0   \n",
+       "1040                                  0.0                 0.0   \n",
+       "1896                                  0.0                 0.0   \n",
+       "2057                                  0.0                 0.0   \n",
+       "...                                   ...                 ...   \n",
+       "209307                                0.0                 0.0   \n",
+       "209308                                0.0                 0.0   \n",
+       "209309                                0.0                 0.0   \n",
+       "212169                                0.0                 0.0   \n",
+       "212170                                0.0                 0.0   \n",
+       "\n",
+       "        transport_consumption  communication_consumption  \\\n",
+       "312                   0.00000                        0.0   \n",
+       "1039                  0.00000                        0.0   \n",
+       "1040                  0.00000                        0.0   \n",
+       "1896                  0.00000                        0.0   \n",
+       "2057                 30.09111                        0.0   \n",
+       "...                       ...                        ...   \n",
+       "209307                0.00000                        0.0   \n",
+       "209308                0.00000                        0.0   \n",
+       "209309                0.00000                        0.0   \n",
+       "212169                0.00000                        0.0   \n",
+       "212170                0.00000                        0.0   \n",
+       "\n",
+       "        recreation_consumption  education_consumption  \\\n",
+       "312                 187.915909                    0.0   \n",
+       "1039                291.699554                    0.0   \n",
+       "1040                291.699554                    0.0   \n",
+       "1896                187.915909                    0.0   \n",
+       "2057                187.915909                    0.0   \n",
+       "...                        ...                    ...   \n",
+       "209307                0.000000                    0.0   \n",
+       "209308                0.000000                    0.0   \n",
+       "209309                0.000000                    0.0   \n",
+       "212169              187.915909                    0.0   \n",
+       "212170              187.915909                    0.0   \n",
+       "\n",
+       "        restaurants_and_hotels_consumption  miscellaneous_consumption  \\\n",
+       "312                                    0.0                  46.057823   \n",
+       "1039                                   0.0                 308.894470   \n",
+       "1040                                   0.0                 308.894470   \n",
+       "1896                                   0.0                  35.310997   \n",
+       "2057                                   0.0                 240.728882   \n",
+       "...                                    ...                        ...   \n",
+       "209307                                 0.0                 167.343414   \n",
+       "209308                                 0.0                 167.343414   \n",
+       "209309                                 0.0                 167.343414   \n",
+       "212169                                 0.0                   0.000000   \n",
+       "212170                                 0.0                   0.000000   \n",
+       "\n",
+       "        petrol_spending  diesel_spending  domestic_energy_consumption  \n",
+       "312                 0.0              0.0                   283.716187  \n",
+       "1039                0.0              0.0                   666.303162  \n",
+       "1040                0.0              0.0                   666.303162  \n",
+       "1896                0.0              0.0                   354.338196  \n",
+       "2057                0.0              0.0                 -2926.207031  \n",
+       "...                 ...              ...                          ...  \n",
+       "209307              0.0              0.0                     0.000000  \n",
+       "209308              0.0              0.0                     0.000000  \n",
+       "209309              0.0              0.0                     0.000000  \n",
+       "212169              0.0              0.0                   638.054382  \n",
+       "212170              0.0              0.0                   638.054382  \n",
+       "\n",
+       "[464 rows x 19 columns]"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "IMPUTATIONS = [\n",
+    "    \"food_and_non_alcoholic_beverages_consumption\",\n",
+    "    \"alcohol_and_tobacco_consumption\",\n",
+    "    \"clothing_and_footwear_consumption\",\n",
+    "    \"housing_water_and_electricity_consumption\",\n",
+    "    \"household_furnishings_consumption\",\n",
+    "    \"health_consumption\",\n",
+    "    \"transport_consumption\",\n",
+    "    \"communication_consumption\",\n",
+    "    \"recreation_consumption\",\n",
+    "    \"education_consumption\",\n",
+    "    \"restaurants_and_hotels_consumption\",\n",
+    "    \"miscellaneous_consumption\",\n",
+    "    \"petrol_spending\",\n",
+    "    \"diesel_spending\",\n",
+    "    \"domestic_energy_consumption\",\n",
+    "]\n",
+    "baseline_income = baseline.calculate(\"household_net_income\", period=2024, map_to=\"person\")\n",
+    "reformed_income = reformed.calculate(\"household_net_income\", period=2024, map_to=\"person\")\n",
+    "difference_income = reformed_income - baseline_income\n",
+    "\n",
+    "baseline.calculate_dataframe([\"age\", \"vat\", \"consumption\", \"full_rate_vat_expenditure_rate\", *IMPUTATIONS])[difference_income > 0]"
+   ]
+  }
+ ],
+ "metadata": {
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+   "name": "python3"
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+}