diff --git a/hub/services/templates/calculator/csp_roi_calculator.html b/hub/services/templates/calculator/csp_roi_calculator.html
index 7bc156e..1f7667b 100644
--- a/hub/services/templates/calculator/csp_roi_calculator.html
+++ b/hub/services/templates/calculator/csp_roi_calculator.html
@@ -353,7 +353,14 @@
                 <h4><i class="bi bi-cash-coin"></i> Investment Settings</h4>
                 
                 <div class="input-group-custom">
-                    <label for="investment-amount">Investment Amount</label>
+                    <label for="investment-amount">
+                        Investment Amount
+                        <i class="bi bi-question-circle-fill text-muted ms-1" 
+                           data-bs-toggle="tooltip" 
+                           data-bs-placement="top" 
+                           title="Higher investments enable better growth through increased marketing, infrastructure, and customer success capabilities."
+                           style="cursor: help; font-size: 0.8rem;"></i>
+                    </label>
                     <div class="input-group">
                         <span class="input-group-text currency-symbol">CHF</span>
                         <input type="text" class="form-control" id="investment-amount" 
@@ -367,6 +374,30 @@
                                onchange="updateInvestmentAmount(this.value)">
                     </div>
                     <small class="text-muted">CHF 100,000 - CHF 2,000,000</small>
+                    
+                    <!-- Investment Impact Details -->
+                    <div class="collapsible-section mt-2">
+                        <div class="collapsible-header" onclick="toggleCollapsible('investment-impact')" style="padding: 0.5rem; font-size: 0.9rem;">
+                            <h6 class="mb-0">
+                                <i class="bi bi-info-circle"></i> Investment Impact
+                                <i class="bi bi-chevron-down float-end"></i>
+                            </h6>
+                        </div>
+                        <div class="collapsible-content" id="investment-impact" style="padding: 0.75rem; font-size: 0.85rem;">
+                            <p class="mb-2"><strong>How Investment Amount Affects Growth</strong></p>
+                            <p class="mb-2">Higher investments enable better growth through increased marketing, infrastructure, and customer success capabilities. This affects instance acquisition rates and reduces churn.</p>
+                            
+                            <p class="mb-2"><strong>Mathematical Impact</strong></p>
+                            <ul class="mb-2" style="font-size: 0.8rem;">
+                                <li><strong>Instance Scaling Factor</strong> = √(Investment Amount / CHF 500,000)</li>
+                                <li><strong>Churn Reduction Factor</strong> = max(0.7, 1 - (Investment - CHF 500,000) / CHF 2,000,000 × 0.3)</li>
+                                <li><strong>New Instances per Month</strong> = Base Rate × Scaling Factor</li>
+                                <li><strong>Adjusted Churn Rate</strong> = Base Churn × Reduction Factor</li>
+                            </ul>
+                            
+                            <p class="mb-0 text-info" style="font-size: 0.8rem;"><strong>Example:</strong> CHF 1M investment = 1.41× more instances + 25% lower churn than CHF 500K base.</p>
+                        </div>
+                    </div>
                 </div>
 
                 <div class="input-group-custom">
@@ -879,6 +910,19 @@ class ROICalculator {
         const scenario = this.scenarios[scenarioKey];
         if (!scenario.enabled) return null;
         
+        // Calculate investment scaling factor
+        // Base investment of CHF 500,000 = 1.0x multiplier
+        // Higher investments get multiplicative benefits for instance acquisition
+        const baseInvestment = 500000;
+        const investmentScaleFactor = Math.sqrt(inputs.investmentAmount / baseInvestment);
+        
+        // Calculate churn reduction factor based on investment
+        // Higher investment = better customer success = lower churn
+        const churnReductionFactor = Math.max(0.7, 1 - (inputs.investmentAmount - baseInvestment) / 2000000 * 0.3);
+        
+        // Calculate adjusted churn rate with investment-based reduction
+        const adjustedChurnRate = scenario.churnRate * churnReductionFactor;
+        
         const totalMonths = inputs.timeframe * 12;
         const monthlyData = [];
         let currentInstances = 0;
@@ -902,11 +946,12 @@ class ROICalculator {
                 monthsInCurrentPhase = 0;
             }
             
-            // Calculate new instances for this month
-            const newInstances = scenario.phases[currentPhase].newInstancesPerMonth;
+            // Calculate new instances for this month with investment scaling
+            const baseNewInstances = scenario.phases[currentPhase].newInstancesPerMonth;
+            const newInstances = Math.floor(baseNewInstances * investmentScaleFactor);
             
-            // Calculate churn
-            const churnedInstances = Math.floor(currentInstances * scenario.churnRate);
+            // Calculate churn using the pre-calculated adjusted churn rate
+            const churnedInstances = Math.floor(currentInstances * adjustedChurnRate);
             
             // Update total instances
             currentInstances = currentInstances + newInstances - churnedInstances;
@@ -954,7 +999,9 @@ class ROICalculator {
                 cumulativeCSPRevenue,
                 cumulativeServalaRevenue,
                 discountedCashFlow,
-                totalDiscountedCashFlow: totalDiscountedCashFlow + inputs.investmentAmount
+                totalDiscountedCashFlow: totalDiscountedCashFlow + inputs.investmentAmount,
+                investmentScaleFactor: investmentScaleFactor,
+                adjustedChurnRate: adjustedChurnRate
             });
             
             monthsInCurrentPhase++;
@@ -975,7 +1022,9 @@ class ROICalculator {
             npv,
             breakEvenMonth,
             npvBreakEvenMonth,
-            monthlyData
+            monthlyData,
+            investmentScaleFactor: investmentScaleFactor,
+            adjustedChurnRate: adjustedChurnRate * 100
         };
     }