diff --git a/src/components/HistoryChart/HistoryChart.adapter.ts b/src/components/HistoryChart/HistoryChart.adapter.ts
new file mode 100644
index 0000000..8f17dca
--- /dev/null
+++ b/src/components/HistoryChart/HistoryChart.adapter.ts
@@ -0,0 +1,75 @@
+import { ReportData } from "../../features/report";
+import {
+  mergeBucketPeriods,
+  getAmount,
+  PeriodKey,
+} from "../report.helpers";
+import { ChartDataPoint } from "./HistoryChart.models";
+
+// ─── Tab → PeriodKey ─────────────────────────────────────────
+
+const TAB_TO_KEY: Record<string, PeriodKey> = {
+  Weekly: "weekly",
+  Monthly: "monthly",
+  Yearly: "yearly",
+  "Financial Year": "fyly",
+  "All Time": "full",
+};
+
+export function tabToKey(tab: string): PeriodKey {
+  return TAB_TO_KEY[tab] ?? "full";
+}
+
+// ─── Comparison ──────────────────────────────────────────────
+
+function attachComparison(
+  points: ChartDataPoint[],
+  key: PeriodKey
+): ChartDataPoint[] {
+  const getCompareIndex = (i: number) => {
+    if (key === "weekly") return i - 4;
+    if (key === "monthly") return i - 12;
+    if (key === "yearly") return i - 1;
+    if (key === "fyly") return i - 1;
+    return -1;
+  };
+
+  return points.map((p, i) => {
+    const ci = getCompareIndex(i);
+
+    return {
+      ...p,
+      compare:
+        ci >= 0 && points[ci]
+          ? {
+              id: points[ci].id,
+              label: points[ci].label,
+              amount: points[ci].amount,
+            }
+          : undefined,
+    };
+  });
+}
+
+// ─── Main adapter ────────────────────────────────────────────
+
+export function buildChartData(
+  reportData: ReportData,
+  key: PeriodKey,
+  mode: "expense" | "income",
+  comparison: boolean
+): ChartDataPoint[] {
+  const merged = mergeBucketPeriods(reportData.buckets, key);
+
+  let points: ChartDataPoint[] = merged.map((p) => ({
+    id: p.id,
+    label: p.label,
+    amount: getAmount(p, mode),
+  }));
+
+  if (comparison) {
+    points = attachComparison(points, key);
+  }
+
+  return points;
+}
diff --git a/src/components/LatestItems/LatestItems.adapter.ts b/src/components/LatestItems/LatestItems.adapter.ts
new file mode 100644
index 0000000..df36795
--- /dev/null
+++ b/src/components/LatestItems/LatestItems.adapter.ts
@@ -0,0 +1,62 @@
+import { ReportData, Transaction } from "../../features/report";
+import {
+  mergeBucketPeriods,
+  periodIdToKey,
+  formatCurrency,
+} from "../report.helpers";
+import { LatestItem } from "./LatestItems.models";
+
+// ─── Transaction extraction ─────────────────────────────────
+
+function extractTransactions(
+  reportData: ReportData,
+  selectedPeriodId: string | null,
+  mode: "expense" | "income"
+): Transaction[] {
+  if (selectedPeriodId) {
+    const key = periodIdToKey(selectedPeriodId);
+    const periods = mergeBucketPeriods(reportData.buckets, key);
+    const selected = periods.find((p) => p.id === selectedPeriodId);
+
+    if (!selected) return [];
+
+    return mode === "expense"
+      ? (selected.expenses.transactions || [])
+      : (selected.incomes.transactions || []);
+  }
+
+  const periods = mergeBucketPeriods(reportData.buckets, "full");
+
+  if (!periods.length) return [];
+
+  const full = periods[0];
+
+  return mode === "expense"
+    ? (full.expenses.transactions || [])
+    : (full.incomes.transactions || []);
+}
+
+// ─── Main adapter ────────────────────────────────────────────
+
+export function buildLatestItems(
+  reportData: ReportData,
+  selectedPeriodId: string | null,
+  mode: "expense" | "income"
+): LatestItem[] {
+  const txns = extractTransactions(reportData, selectedPeriodId, mode);
+
+  return txns
+    .filter((t) => (mode === "expense" ? t.amount < 0 : t.amount >= 0))
+    .sort(
+      (a, b) =>
+        new Date(b.occurred_at).getTime() -
+        new Date(a.occurred_at).getTime()
+    )
+    .map((t, index) => ({
+      id: index + 1,
+      title: t.payee.name,
+      subtitle: t.tags.map((tag) => tag.name).join(", "),
+      amount: formatCurrency(t.amount),
+      timeAgo: new Date(t.occurred_at).toLocaleDateString("en-IN"),
+    }));
+}
diff --git a/src/components/ProgressCard/TopTags.adapter.ts b/src/components/ProgressCard/TopTags.adapter.ts
new file mode 100644
index 0000000..ea0eb63
--- /dev/null
+++ b/src/components/ProgressCard/TopTags.adapter.ts
@@ -0,0 +1,74 @@
+import { ReportData } from "../../features/report";
+import {
+  getAmount,
+  DecoratedPeriod,
+} from "../report.helpers";
+
+// ─── Helpers ─────────────────────────────────────────────────
+
+function findPeriod(
+  periods: DecoratedPeriod[],
+  selectedPeriodId?: string | null
+) {
+  if (!periods.length) return null;
+
+  if (selectedPeriodId) {
+    const match = periods.find((p) => p.id === selectedPeriodId);
+    if (match) return match;
+  }
+
+  // fallback → latest
+  return periods.reduce((latest, p) =>
+    new Date(p.start).getTime() > new Date(latest.start).getTime()
+      ? p
+      : latest
+  );
+}
+
+// ─── Main adapter ────────────────────────────────────────────
+
+export interface TagItem {
+  tag: string;
+  amount: number;
+}
+
+export function extractTopTags(
+  reportData: ReportData,
+  mode: "expense" | "income",
+  selectedPeriodId?: string | null
+): { items: TagItem[]; total: number } {
+  const tagMap = new Map<string, number>();
+
+  for (const bucket of reportData.buckets) {
+    const tags = bucket.group_key.tags;
+    if (!tags || tags.length === 0) continue;
+
+    // Prefer FULL if available
+    const fullPeriods = (bucket.periods.full || []) as DecoratedPeriod[];
+
+    const periodsToUse = selectedPeriodId
+      ? (Object.values(bucket.periods).flat() as DecoratedPeriod[])
+      : fullPeriods;
+
+    const period = findPeriod(periodsToUse, selectedPeriodId);
+    if (!period) continue;
+
+    const amount = getAmount(period, mode);
+
+    for (const tag of tags) {
+      tagMap.set(tag, (tagMap.get(tag) || 0) + amount);
+    }
+  }
+
+  const arr = Array.from(tagMap.entries()).map(([tag, amount]) => ({
+    tag,
+    amount,
+  }));
+
+  arr.sort((a, b) => b.amount - a.amount);
+
+  const top = arr.slice(0, 4);
+  const total = top.reduce((sum, t) => sum + t.amount, 0);
+
+  return { items: top, total };
+}
diff --git a/src/components/report.helpers.ts b/src/components/report.helpers.ts
new file mode 100644
index 0000000..eb003fd
--- /dev/null
+++ b/src/components/report.helpers.ts
@@ -0,0 +1,114 @@
+import {
+  ReportPeriod,
+  ReportBucket,
+} from "../features/report";
+
+// ─── Types ────────────────────────────────────────────────────
+
+export type PeriodKey = "weekly" | "monthly" | "yearly" | "fyly" | "full";
+
+export type DecoratedPeriod = ReportPeriod & {
+  id: string;
+  label: string;
+};
+
+// ─── Period helpers ───────────────────────────────────────────
+
+const PREFIX_TO_KEY: Record<string, PeriodKey> = {
+  W: "weekly",
+  M: "monthly",
+  Y: "yearly",
+  FY: "fyly",
+  FULL: "full",
+};
+
+/**
+ * Derive the period key from a decorated-period id.
+ * E.g. `"W:2026-04-28_2026-05-04"` → `"weekly"`
+ */
+export function periodIdToKey(periodId: string): PeriodKey {
+  const prefix = periodId.split(":")[0];
+  return PREFIX_TO_KEY[prefix] ?? "full";
+}
+
+// ─── Metric helpers ───────────────────────────────────────────
+
+export function getAmount(
+  period: ReportPeriod,
+  mode: "expense" | "income"
+): number {
+  return mode === "expense" ? period.expenses.sum : period.incomes.sum;
+}
+
+function mergeMetric(a: ReportPeriod["expenses"], b: ReportPeriod["expenses"]) {
+  const sum = a.sum + b.sum;
+  const count = a.count + b.count;
+
+  return {
+    ...a,
+    sum,
+    count,
+    average: count > 0 ? sum / count : 0,
+    transactions:
+      a.transactions || b.transactions
+        ? [...(a.transactions || []), ...(b.transactions || [])]
+        : undefined,
+  };
+}
+
+/**
+ * Merge periods with the same id across all buckets, summing
+ * their metrics and concatenating transactions.
+ *
+ * Returns sorted by start date ascending.
+ */
+export function mergeBucketPeriods(
+  buckets: ReportBucket[],
+  key: PeriodKey
+): DecoratedPeriod[] {
+  const map = new Map<string, DecoratedPeriod>();
+
+  for (const bucket of buckets) {
+    const periods = (bucket.periods[key] || []) as DecoratedPeriod[];
+
+    for (const p of periods) {
+      const existing = map.get(p.id);
+
+      if (!existing) {
+        map.set(p.id, {
+          ...p,
+          expenses: { ...p.expenses },
+          incomes: { ...p.incomes },
+        });
+      } else {
+        map.set(p.id, {
+          ...existing,
+          expenses: mergeMetric(existing.expenses, p.expenses),
+          incomes: mergeMetric(existing.incomes, p.incomes),
+        });
+      }
+    }
+  }
+
+  return Array.from(map.values()).sort(
+    (a, b) => new Date(a.start).getTime() - new Date(b.start).getTime()
+  );
+}
+
+// ─── Formatting ───────────────────────────────────────────────
+
+export const formatCurrency = (val: number) => {
+  const absVal = Math.abs(val);
+  if (absVal >= 100000) {
+    return `₹ ${(val / 100000).toFixed(2)}L`;
+  }
+  if (absVal >= 1000) {
+    return `₹ ${(val / 1000).toFixed(2)}k`;
+  }
+  return `₹ ${val.toFixed(2)}`;
+};
+
+export const getPercentage = (progressAmount: number, totalAmount: number) => {
+  if (!totalAmount) return 0;
+  return Math.min(100, Math.max(0, (progressAmount / totalAmount) * 100));
+};