PolicyEngine · MaxGhenis · Apr 17, 2026 · Apr 17, 2026
diff --git a/changelog.d/migrate-utils-spm-to-spm-calculator.fixed.md b/changelog.d/migrate-utils-spm-to-spm-calculator.fixed.md
@@ -0,0 +1 @@
+Bump `spm-calculator` dependency from `>=0.1.0` to `>=0.2.1` so the SPM thresholds computed for the CPS input dataset use the Betson three-parameter equivalence scale (with the 0.7 exponent) published by Census, not the linear OECD-modified scale shipped in `spm-calculator==0.1.0`. Also picks up tenure-specific GEOADJ shares (renter 0.443, owner-with-mortgage 0.434, owner-without-mortgage 0.323) and the BLS-fidelity improvements in the CE recomputation path. For a 2-adult 2-child reference family the threshold is unchanged; non-reference families shift materially (1 adult / 2 children owner-with-mortgage: $29,767 -> $32,437, +9.0%; 2 adults / 0 children owner-with-mortgage: $27,906 -> $25,530, -8.5%). No code changes in `policyengine_us_data/utils/spm.py`; the package-level API is unchanged across the version bump.
diff --git a/pyproject.toml b/pyproject.toml
@@ -42,7 +42,7 @@ dependencies = [
     "sqlalchemy>=2.0.41",
     "sqlmodel>=0.0.24",
     "xlrd>=2.0.2",
-    "spm-calculator>=0.1.0",
+    "spm-calculator>=0.2.1",
     "tenacity>=8.0.0",
 ]
 

diff --git a/uv.lock b/uv.lock
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Bump `spm-calculator` dependency from `>=0.1.0` to `>=0.2.1` so the SPM thresholds computed for the CPS input dataset use the Betson three-parameter equivalence scale (with the 0.7 exponent) published by Census, not the linear OECD-modified scale shipped in `spm-calculator==0.1.0`. Also picks up tenure-specific GEOADJ shares (renter 0.443, owner-with-mortgage 0.434, owner-without-mortgage 0.323) and the BLS-fidelity improvements in the CE recomputation path. For a 2-adult 2-child reference family the threshold is unchanged; non-reference families shift materially (1 adult / 2 children owner-with-mortgage: $29,767 -> $32,437, +9.0%; 2 adults / 0 children owner-with-mortgage: $27,906 -> $25,530, -8.5%). No code changes in `policyengine_us_data/utils/spm.py`; the package-level API is unchanged across the version bump.