diff --git a/frontend/src/pages/Monthly.tsx b/frontend/src/pages/Monthly.tsx
index 709f646..f232613 100644
--- a/frontend/src/pages/Monthly.tsx
+++ b/frontend/src/pages/Monthly.tsx
@@ -153,9 +153,10 @@ export default function Monthly() {
     }
   }).sort((a, b) => b.forecast_eom - a.forecast_eom)
 
-  const totalActual   = deptSummary.reduce((s, d) => s + d.actual_mtd, 0)
-  const totalForecast = deptSummary.reduce((s, d) => s + d.forecast_eom, 0)
-  const pyTotalWages  = pyDepts.reduce((s, d) => s + d.cost, 0)
+  const totalActual      = deptSummary.reduce((s, d) => s + d.actual_mtd, 0)
+  const totalForecast    = deptSummary.reduce((s, d) => s + d.forecast_eom, 0)
+  const pyTotalWages     = pyDepts.reduce((s, d) => s + d.cost, 0)
+  const pyTotalWagesFull = pyDepts.reduce((s, d) => s + d.costFull, 0)
 
   // MTD row: pro-rata budget to yesterday
   const yDay         = isCurrentMonth ? parseInt(yesterdayStr.slice(8)) : dim
@@ -349,6 +350,7 @@ export default function Monthly() {
                   <th className="right">{isCurrentMonth ? 'Actual MTD' : 'Actual'}</th>
                   {isCurrentMonth && <th className="right">Forecast → EOM</th>}
                   <th className="right">% of Total</th>
+                  <th className="right">vs PY</th>
                   <th className="right">Budget</th>
                   <th className="right">% Budget</th>
                   <th className="right">Variance</th>
@@ -364,6 +366,10 @@ export default function Monthly() {
                   const dp         = depBudg != null && depBudg > 0 ? (displayCost / depBudg) * 100 : null
                   const dv         = depBudg != null ? displayCost - depBudg : null
                   const depOfTotal = totalDisplay > 0 ? (displayCost / totalDisplay) * 100 : null
+                  // PY: compare actual_mtd vs PY MTD for current month; actual vs PY full for past months
+                  const pyDept   = pyDepts.find(p => p.id === dep.department_id)
+                  const pyCost   = pyDept ? (isCurrentMonth ? pyDept.cost : pyDept.costFull) : null
+                  const pyDelta  = pyCost != null && pyCost > 0 ? ((dep.actual_mtd - pyCost) / pyCost) * 100 : null
                   return (
                     <tr key={dep.department_id} style={{ cursor: 'pointer' }}
                         onClick={() => setModal({ deptId: dep.department_id, deptName: dep.department_name })}>
@@ -376,6 +382,11 @@ export default function Monthly() {
                       <td className="right" style={{ color: 'var(--text-muted)' }}>
                         {depOfTotal != null ? `${depOfTotal.toFixed(1)}%` : '—'}
                       </td>
+                      <td className="right">
+                        {pyDelta != null
+                          ? <span className={pyDelta > 0 ? 'variance-over' : 'variance-under'}>{pyDelta > 0 ? '+' : ''}{pyDelta.toFixed(1)}%</span>
+                          : '—'}
+                      </td>
                       <td className="right">{depBudg != null ? fmtMoney(depBudg) : '—'}</td>
                       <td className="right">
                         {dp != null ? <span className={`pct-badge ${pctClass(dp)}`}>{fmtDelta(dp)}</span> : '—'}
@@ -391,6 +402,14 @@ export default function Monthly() {
                   <td className="right">{fmtMoney(totalActual)}</td>
                   {isCurrentMonth && <td className="right">{fmtMoney(totalForecast)}</td>}
                   <td className="right">100%</td>
+                  <td className="right">
+                    {(() => {
+                      const pyBase = isCurrentMonth ? pyTotalWages : pyTotalWagesFull
+                      if (pyBase <= 0) return '—'
+                      const d = ((totalActual - pyBase) / pyBase) * 100
+                      return <span className={d > 0 ? 'variance-over' : 'variance-under'}>{d > 0 ? '+' : ''}{d.toFixed(1)}%</span>
+                    })()}
+                  </td>
                   <td className="right">{budget != null ? fmtMoney(budget) : '—'}</td>
                   <td className="right">
                     {pctBudgFull != null ? <span className={`pct-badge ${pctClass(pctBudgFull)}`}>{fmtDelta(pctBudgFull)}</span> : '—'}