diff --git a/changelog.d/618.changed.md b/changelog.d/618.changed.md
new file mode 100644
index 00000000..cf52e674
--- /dev/null
+++ b/changelog.d/618.changed.md
@@ -0,0 +1 @@
+Document and test the 2022–2036 SPM forecast horizon: 2036 joins the supported household years and 2037 becomes the out-of-horizon example.
diff --git a/docs/households.md b/docs/households.md
index f83e3fc7..4b776231 100644
--- a/docs/households.md
+++ b/docs/households.md
@@ -70,7 +70,7 @@ set of keys is:
 | `as_of` | Optional information-date cutoff accepted by the pinned artifact. |
 
 Forecast paths, provider objects and fallback policies are not settings. The
-canonical artifact covers 2022–2035. Its receipt distinguishes published
+canonical artifact covers 2022–2036. Its receipt distinguishes published
 national inputs from forecast components and research geography; an unsupported
 year fails instead of being extrapolated by the wrapper. Scenario forecasts
 are conditional research estimates, not agency forecasts or uncertainty bounds.
diff --git a/docs/microsim.md b/docs/microsim.md
index 98dd0244..6a8047e1 100644
--- a/docs/microsim.md
+++ b/docs/microsim.md
@@ -64,7 +64,7 @@ The same `spm=` selection is accepted by
 `pe.us.managed_microsimulation`; its returned country simulation exposes
 `spm_config` and `spm_provenance()` too. See the [household SPM
 contract](households.md#spm-geography-and-measurement-selection) for exact keys,
-the 2022–2035 artifact horizon and explicit geography errors. No provider or
+the 2022–2036 artifact horizon and explicit geography errors. No provider or
 forecast-file path can replace the bundle's pinned artifact.
 
 For a small local development dataset, explicitly opt out of managed data
diff --git a/tests/test_spm_household.py b/tests/test_spm_household.py
index 5e63ca8e..03401682 100644
--- a/tests/test_spm_household.py
+++ b/tests/test_spm_household.py
@@ -62,7 +62,7 @@ def household_inputs(**overrides):
     return values
 
 
-@pytest.mark.parametrize("year", [2024, 2026, 2035])
+@pytest.mark.parametrize("year", [2024, 2026, 2035, 2036])
 def test_explicit_national_amounts_and_component_provenance(year, tmp_path):
     result = pe.us.calculate_household(
         **household_inputs(year=year),
@@ -390,7 +390,7 @@ def test_axes_reforms_and_scenarios_keep_detached_receipts():
     assert selection == {"geography_kind": "national", "scenario": "ce_trend"}
 
 
-@pytest.mark.parametrize("year", [2021, 2036])
+@pytest.mark.parametrize("year", [2021, 2037])
 def test_year_outside_canonical_horizon_is_not_silently_extrapolated(year):
     with pytest.raises(ValueError, match="no entry|unavailable|not available"):
         pe.us.calculate_household(