diff --git a/src/mongo/db/query/cost_based_ranker/cardinality_estimator.cpp b/src/mongo/db/query/cost_based_ranker/cardinality_estimator.cpp
index d421dfdff57..97169272eaf 100644
--- a/src/mongo/db/query/cost_based_ranker/cardinality_estimator.cpp
+++ b/src/mongo/db/query/cost_based_ranker/cardinality_estimator.cpp
@@ -70,9 +70,13 @@ CEResult CardinalityEstimator::estimate(const QuerySolutionNode* node) {
             break;
         case STAGE_SORT_DEFAULT:
         case STAGE_SORT_SIMPLE:
-            ceRes = _inputCard;
+        case STAGE_PROJECTION_DEFAULT:
+        case STAGE_PROJECTION_COVERED:
+        case STAGE_PROJECTION_SIMPLE: {
+            ceRes = estimate(node->children[0].get());
             isConjunctionBreaker = true;
             break;
+        }
         default:
             MONGO_UNIMPLEMENTED_TASSERT(9586709);
     } diff --git a/src/mongo/db/query/cost_based_ranker/cost_estimator.cpp b/src/mongo/db/query/cost_based_ranker/cost_estimator.cpp
index 4aae1562848..4beacc02845 100644
--- a/src/mongo/db/query/cost_based_ranker/cost_estimator.cpp
+++ b/src/mongo/db/query/cost_based_ranker/cost_estimator.cpp
@@ -132,6 +132,12 @@ CostEstimate CostEstimator::costNode(const QuerySolutionNode* node,
             }
             break;
         }
+        case STAGE_PROJECTION_DEFAULT:
+        case STAGE_PROJECTION_COVERED:
+        case STAGE_PROJECTION_SIMPLE: {
+            nodeCost = projectionStartup * oneCE + projectionIncrement * ce;
+            break;
+        }
         default:
             MONGO_UNIMPLEMENTED_TASSERT(9695102);
     }
@@ -192,4 +198,7 @@ const CostCoefficient CostEstimator::sortedMergeStartup = minCC;
 const CostCoefficient CostEstimator::sortedMergeIncrement =
     CostCoefficient{CostCoefficientType{100.0_ms}};
 
+const CostCoefficient CostEstimator::projectionStartup = minCC;
+const CostCoefficient CostEstimator::projectionIncrement = minCC;
+
 }  // namespace mongo::cost_based_ranker
diff --git a/src/mongo/db/query/cost_based_ranker/cost_estimator.h b/src/mongo/db/query/cost_based_ranker/cost_estimator.h
index ac7a2c6312d..5196eedf9f0 100644
--- a/src/mongo/db/query/cost_based_ranker/cost_estimator.h
+++ b/src/mongo/db/query/cost_based_ranker/cost_estimator.h
@@ -84,6 +84,9 @@ private:
     static const CostCoefficient sortedMergeStartup;
     static const CostCoefficient sortedMergeIncrement;
 
+    static const CostCoefficient projectionStartup;
+    static const CostCoefficient projectionIncrement;
+
     EstimateMap& _estimateMap;
 };