Format rate-type validation rows as percentages

frontend/components/populace/populace-reforms-view.tsx

@@ -3,7 +3,7 @@
 import { Fragment, useEffect, useMemo, useState } from "react";
 
 import { EmptyState } from "@/components/shared/empty-state";
-import { fmt, fmtMoney, releaseLabel } from "@/components/shared/format";
+import { fmt, fmtMoney, fmtUnitValue, releaseLabel } from "@/components/shared/format";
 import { KpiCard } from "@/components/shared/kpi-card";
 import { LoadingBlock } from "@/components/shared/LoadingBlock";
 import { PageHeader } from "@/components/shared/page-header";
@@ -253,10 +253,10 @@ function ReformTable({
                     </div>
                   </td>
                   <td className="whitespace-nowrap px-3 py-1.5 text-right tabular-nums">
-                    {fmtMoney(row.jct_score)}
+                    {fmtUnitValue(row.jct_score, row.unit)}
                   </td>
                   <td className="whitespace-nowrap px-3 py-1.5 text-right tabular-nums">
-                    {fmtMoney(row.populace_estimate)}
+                    {fmtUnitValue(row.populace_estimate, row.unit)}
                   </td>
                   <td className="whitespace-nowrap px-3 py-1.5">
                     <ErrorCell absRel={row.abs_relative_error} />

frontend/components/populace/populace-staging-view.tsx

@@ -4,6 +4,7 @@ import { useEffect, useMemo, useState } from "react";
 
 import { EmptyState } from "@/components/shared/empty-state";
 import {
+  fmtUnitValue,
   fmt,
   fmtCompact,
   fmtMoney,
@@ -245,10 +246,10 @@ function ReformValidationTable({
                   </div>
                 </td>
                 <td className="whitespace-nowrap px-3 py-2 text-right tabular-nums">
-                  {fmtMoney(row.jct_score)}
+                  {fmtUnitValue(row.jct_score, row.unit)}
                 </td>
                 <td className="whitespace-nowrap px-3 py-2 text-right tabular-nums">
-                  {fmtMoney(row.populace_estimate)}
+                  {fmtUnitValue(row.populace_estimate, row.unit)}
                 </td>
                 <td
                   className={`whitespace-nowrap px-3 py-2 text-right tabular-nums ${

frontend/components/shared/format.ts

@@ -73,6 +73,20 @@ export function fmtCompact(value: number | null | undefined): string {
   return `${sign}${abs.toFixed(0)}`;
 }
 
+/** Format a validation value by its payload unit: "percent" rows hold
+ *  decimal fractions (0.134 -> "13.4%"); everything else is USD. */
+export function fmtUnitValue(
+  value: number | null | undefined,
+  unit: string | null | undefined,
+): string {
+  if (unit === "percent") {
+    return value == null || !Number.isFinite(value)
+      ? "—"
+      : `${(value * 100).toFixed(1)}%`;
+  }
+  return fmtMoney(value);
+}
+
 export function fmtMoney(value: number | null | undefined): string {
   if (value == null || !Number.isFinite(value)) return "—";
   const abs = Math.abs(value);

frontend/lib/api/hooks/use-populace.ts

@@ -489,6 +489,8 @@ export interface ReformValidationRow {
   populace_estimate?: number | null;
   populace_window?: string | null;
   populace_annual?: Record<string, number> | null;
+  /** "percent" for rate backtests (decimal fractions); USD otherwise. */
+  unit?: "currency-USD" | "percent" | null;
   abs_error?: number | null;
   relative_error?: number | null;
   abs_relative_error?: number | null;

frontend/lib/populace/reforms.ts

@@ -93,6 +93,10 @@ export interface ReformValidationRow {
   populace_estimate: number | null;
   populace_window: string | null;
   populace_annual: Record<string, number> | null;
+  // Value unit: "currency-USD" (default) or "percent" for rate backtests
+  // (e.g. Census state SPM poverty rates, where the values are decimal
+  // fractions like 0.134 rather than dollars).
+  unit: "currency-USD" | "percent";
   // Derived (relative to jct_score, i.e. the FY2027 benchmark where available).
   abs_error: number | null; // populace − jct (USD)
   relative_error: number | null; // (populace − jct) / |jct|
@@ -157,6 +161,7 @@ function enrichReform(raw: JsonObject): ReformValidationRow {
     description: stringOrNull(raw.description),
     in_sample: raw.in_sample === true,
     period: numberOrNull(raw.period),
+    unit: raw.unit === "percent" ? "percent" : "currency-USD",
     jct_score: benchmark,
     jct_score_fy2026: jctFy2026,
     jct_score_type: stringOrNull(jct.score_type),