diff --git a/fe-user/src/components/pe/PeDetailTabs.tsx b/fe-user/src/components/pe/PeDetailTabs.tsx
index e23ad51..233c7ce 100644
--- a/fe-user/src/components/pe/PeDetailTabs.tsx
+++ b/fe-user/src/components/pe/PeDetailTabs.tsx
@@ -32,7 +32,8 @@ import {
   type PeQuote,
   type PeSupplier,
 } from '@/types/purchaseEvaluation'
-import type { Supplier } from '@/types/master'
+import { BudgetPhase, type BudgetListItem } from '@/types/budget'
+import type { Paged, Supplier } from '@/types/master'
 
 const fmtMoney = (v: number) => v.toLocaleString('vi-VN')
 
@@ -306,6 +307,158 @@ function InfoTab({ ev }: { ev: PeDetailBundle }) {
   )
 }
 
+// ===== b. Ngân sách inline editor (Mig 17) =====
+// Hiển thị + edit budget link / manual fields ngay trong Section 2 — KHÔNG cần
+// đi tới "Sửa header" page. Visible trong cả 3 view (Workspace / Danh sách /
+// Duyệt). Edit chỉ enable khi !readOnly + isDraft (Drafter sửa). Read-only
+// khi pendingMe=1 hoặc phase đã chuyển khỏi DangSoanThao. Empty values hiển
+// thị empty (per user 2026-05-07).
+function BudgetFieldRow({ ev, readOnly }: { ev: PeDetailBundle; readOnly: boolean }) {
+  const isDraft = ev.phase === PurchaseEvaluationPhase.DangSoanThao
+  const canEdit = !readOnly && isDraft
+  const qc = useQueryClient()
+
+  // Detect mode khi mount/refresh: prefer manual mode nếu đã có data manual + ko link
+  const initialManual = (ev.budgetManualName !== null || ev.budgetManualAmount !== null) && !ev.budgetId
+  const [manualMode, setManualMode] = useState(initialManual)
+  const [budgetId, setBudgetId] = useState(ev.budgetId ?? '')
+  const [manualName, setManualName] = useState(ev.budgetManualName ?? '')
+  const [manualAmount, setManualAmount] = useState(ev.budgetManualAmount ?? 0)
+
+  // Eligible budgets — chỉ fetch khi user có khả năng edit
+  const eligibleBudgets = useQuery({
+    queryKey: ['eligible-budgets', ev.projectId],
+    queryFn: async () => (await api.get<Paged<BudgetListItem>>('/budgets', {
+      params: { pageSize: 100, projectId: ev.projectId, phase: BudgetPhase.DaDuyet },
+    })).data.items,
+    enabled: canEdit,
+  })
+
+  // Dirty detect — compare current state vs ev original
+  const dirty = manualMode !== initialManual
+    || (manualMode && (manualName !== (ev.budgetManualName ?? '') || manualAmount !== (ev.budgetManualAmount ?? 0)))
+    || (!manualMode && budgetId !== (ev.budgetId ?? ''))
+
+  const save = useMutation({
+    mutationFn: async () => {
+      const payload = manualMode
+        ? { budgetId: null, budgetManualName: manualName || null, budgetManualAmount: manualAmount > 0 ? manualAmount : null }
+        : { budgetId: budgetId || null, budgetManualName: null, budgetManualAmount: null }
+      await api.put(`/purchase-evaluations/${ev.id}`, {
+        id: ev.id,
+        tenGoiThau: ev.tenGoiThau,
+        diaDiem: ev.diaDiem,
+        moTa: ev.moTa,
+        paymentTerms: ev.paymentTerms,
+        ...payload,
+      })
+    },
+    onSuccess: () => {
+      toast.success('Đã cập nhật ngân sách')
+      qc.invalidateQueries({ queryKey: ['pe-detail', ev.id] })
+      qc.invalidateQueries({ queryKey: ['pe-list'] })
+    },
+    onError: e => toast.error(getErrorMessage(e)),
+  })
+
+  // Read-only mode: chỉ display (không toggle, không edit)
+  if (!canEdit) {
+    return (
+      <FormRow
+        label="b. Ngân sách"
+        value={ev.budget ? (
+          <a href={`/budgets?id=${ev.budget.id}`} className="text-brand-600 hover:underline">
+            <span className="font-mono text-[11px]">{ev.budget.maNganSach ?? '—'}</span>
+            {' · '}{ev.budget.tenNganSach}
+            {' · '}<span className="text-slate-500">{ev.budget.tongNganSach.toLocaleString('vi-VN')} đ</span>
+          </a>
+        ) : ev.budgetManualAmount != null || ev.budgetManualName ? (
+          <span className="text-slate-700">
+            {ev.budgetManualName && <span>{ev.budgetManualName}</span>}
+            {ev.budgetManualName && ev.budgetManualAmount != null && ' · '}
+            {ev.budgetManualAmount != null && (
+              <span className="font-semibold text-slate-900">{ev.budgetManualAmount.toLocaleString('vi-VN')} đ</span>
+            )}
+            <span className="ml-2 rounded bg-slate-100 px-1.5 py-0.5 text-[10px] text-slate-500">nhập tay</span>
+          </span>
+        ) : <span className="text-slate-400">—</span>}
+      />
+    )
+  }
+
+  // Editable mode (canEdit=true)
+  return (
+    <div className="flex gap-3">
+      <span className="w-44 shrink-0 pt-1.5 text-[12px] text-slate-500">b. Ngân sách</span>
+      <div className="min-w-0 flex-1 space-y-2">
+        <label className="inline-flex cursor-pointer items-center gap-1.5 text-[11px] text-slate-600">
+          <input
+            type="checkbox"
+            checked={manualMode}
+            onChange={e => setManualMode(e.target.checked)}
+            className="h-3.5 w-3.5 rounded border-slate-300"
+          />
+          Nhập tay (không link)
+        </label>
+        {!manualMode ? (
+          <Select
+            value={budgetId}
+            onChange={e => setBudgetId(e.target.value)}
+            className="text-sm"
+          >
+            <option value="">—</option>
+            {eligibleBudgets.data?.map(b => (
+              <option key={b.id} value={b.id}>
+                {b.maNganSach ?? '—'} · {b.tenNganSach} · {b.tongNganSach.toLocaleString('vi-VN')} đ
+              </option>
+            ))}
+          </Select>
+        ) : (
+          <div className="grid grid-cols-1 gap-2 md:grid-cols-2">
+            <Input
+              value={manualName}
+              onChange={e => setManualName(e.target.value)}
+              placeholder="Tên ngân sách (vd Tạm tính T11/2025)"
+              maxLength={200}
+              className="text-sm"
+            />
+            <Input
+              type="number"
+              min={0}
+              value={manualAmount || ''}
+              onChange={e => setManualAmount(Number(e.target.value))}
+              placeholder="Số tiền (đ)"
+              className="text-sm"
+            />
+          </div>
+        )}
+        {dirty && (
+          <div className="flex items-center gap-2">
+            <Button
+              onClick={() => save.mutate()}
+              disabled={save.isPending}
+              className="h-7 px-3 text-xs"
+            >
+              {save.isPending ? 'Đang lưu…' : 'Lưu ngân sách'}
+            </Button>
+            <button
+              onClick={() => {
+                setManualMode(initialManual)
+                setBudgetId(ev.budgetId ?? '')
+                setManualName(ev.budgetManualName ?? '')
+                setManualAmount(ev.budgetManualAmount ?? 0)
+              }}
+              className="text-[11px] text-slate-500 hover:text-slate-700"
+            >
+              Hủy thay đổi
+            </button>
+          </div>
+        )}
+      </div>
+    </div>
+  )
+}
+
 // ===== Section 2 — Chọn NCC/TP (spec: a/b/c/d) =====
 function ChonNccSection({ ev, readOnly = false }: { ev: PeDetailBundle; readOnly?: boolean }) {
   const canCreateContract = !readOnly && ev.phase === PurchaseEvaluationPhase.DaDuyet && !ev.contractId && ev.selectedSupplierId
@@ -335,27 +488,7 @@ function ChonNccSection({ ev, readOnly = false }: { ev: PeDetailBundle; readOnly
           <span className="font-medium text-emerald-700">✓ {ev.selectedSupplierName}</span>
         ) : <span className="text-slate-400">— (chưa chọn)</span>}
       />
-      <FormRow
-        label="b. Ngân sách"
-        value={ev.budget ? (
-          <a href={`/budgets?id=${ev.budget.id}`} className="text-brand-600 hover:underline">
-            <span className="font-mono text-[11px]">{ev.budget.maNganSach ?? '—'}</span>
-            {' · '}{ev.budget.tenNganSach}
-            {' · '}<span className="text-slate-500">{ev.budget.tongNganSach.toLocaleString('vi-VN')} đ</span>
-          </a>
-        ) : ev.budgetManualAmount != null || ev.budgetManualName ? (
-          // Mig 17 — manual budget fallback: hiển thị tên + số tiền nhập tay,
-          // không phải link vào /budgets/{id} (không có Budget entity).
-          <span className="text-slate-700">
-            {ev.budgetManualName && <span>{ev.budgetManualName}</span>}
-            {ev.budgetManualName && ev.budgetManualAmount != null && ' · '}
-            {ev.budgetManualAmount != null && (
-              <span className="font-semibold text-slate-900">{ev.budgetManualAmount.toLocaleString('vi-VN')} đ</span>
-            )}
-            <span className="ml-2 rounded bg-slate-100 px-1.5 py-0.5 text-[10px] text-slate-500">nhập tay</span>
-          </span>
-        ) : <span className="text-slate-400">— (chưa link)</span>}
-      />
+      <BudgetFieldRow ev={ev} readOnly={readOnly} />
       <FormRow
         label="c. Giá chào thầu"
         value={giaChaoThau != null ? (