diff --git a/pitch-deck/components/slides/FinanzplanSlide.tsx b/pitch-deck/components/slides/FinanzplanSlide.tsx
index 0e1527e..4b64c53 100644
--- a/pitch-deck/components/slides/FinanzplanSlide.tsx
+++ b/pitch-deck/components/slides/FinanzplanSlide.tsx
@@ -39,6 +39,7 @@ interface SheetRow {
   position?: string
   start_date?: string
   purchase_amount?: number
+  [key: string]: unknown
 }
 
 const MONTH_LABELS = [
@@ -575,7 +576,50 @@ export default function FinanzplanSlide({ lang, investorId, preferredScenarioId,
               </tr>
             </thead>
             <tbody>
-              {rows.map(row => {
+              {(() => {
+                // Live-compute sum rows from detail rows (like Excel formulas)
+                const computedRows = rows.map(row => {
+                  const label = getLabel(row)
+                  const cat = (row as Record<string, unknown>).category as string || ''
+                  if (!row.is_sum_row) return row
+
+                  // Find detail rows for this category
+                  const detailRows = rows.filter(r => {
+                    const rCat = (r as Record<string, unknown>).category as string || ''
+                    return rCat === cat && !r.is_sum_row
+                  })
+
+                  // For "Summe sonstige" or "SUMME Betriebliche" — sum all non-sum, non-personal, non-abschreibung
+                  let sourceRows = detailRows
+                  if (label.includes('Summe sonstige') || label.includes('SUMME Betriebliche')) {
+                    sourceRows = rows.filter(r => {
+                      const rCat = (r as Record<string, unknown>).category as string || ''
+                      const rLabel = getLabel(r)
+                      if (r.is_sum_row) return false
+                      if (label.includes('Summe sonstige')) {
+                        return rCat !== 'personal' && rCat !== 'abschreibungen' && !rLabel.includes('Personalkosten') && !rLabel.includes('Abschreibungen')
+                      }
+                      // SUMME Betriebliche = everything including personal + abschreibungen
+                      return true
+                    })
+                  }
+
+                  if (sourceRows.length === 0) return row
+
+                  const computed: Record<string, number> = {}
+                  for (let m = 1; m <= 60; m++) {
+                    const key = `m${m}`
+                    computed[key] = sourceRows.reduce((sum, r) => {
+                      const v = getValues(r)
+                      return sum + (v[key] || 0)
+                    }, 0)
+                  }
+
+                  return { ...row, values: computed, values_total: computed }
+                })
+
+                return computedRows
+              })().map(row => {
                 const values = getValues(row)
                 const label = getLabel(row)
                 const isSumRow = row.is_sum_row || label.includes('GESAMT') || label.includes('Summe') || label.includes('ÜBERSCHUSS') || label.includes('LIQUIDITÄT') || label.includes('UEBERSCHUSS') || label.includes('LIQUIDITAET')