diff --git a/quacc/method/base.py b/quacc/method/base.py
index dcc19f8..b31c039 100644
--- a/quacc/method/base.py
+++ b/quacc/method/base.py
@@ -17,11 +17,10 @@ class BaseAccuracyEstimator(BaseQuantifier):
         self,
         classifier: BaseEstimator,
         quantifier: BaseQuantifier,
-        collapse_false=False,
     ):
         self.__check_classifier(classifier)
         self.quantifier = quantifier
-        self.extpol = ExtensionPolicy(collapse_false=collapse_false)
+        self.extpol = ExtensionPolicy()
 
     def __check_classifier(self, classifier):
         if not hasattr(classifier, "predict_proba"):
@@ -50,23 +49,17 @@ class BaseAccuracyEstimator(BaseQuantifier):
     def estimate(self, instances, ext=False) -> np.ndarray:
         ...
 
-    @property
-    def collapse_false(self):
-        return self.extpol.collapse_false
-
 
 class ConfidenceBasedAccuracyEstimator(BaseAccuracyEstimator):
     def __init__(
         self,
         classifier: BaseEstimator,
         quantifier: BaseQuantifier,
-        collapse_false=False,
         confidence=None,
     ):
         super().__init__(
             classifier=classifier,
             quantifier=quantifier,
-            collapse_false=collapse_false,
         )
         self.__check_confidence(confidence)
         self.calibrator = None
@@ -137,8 +130,8 @@ class MultiClassAccuracyEstimator(ConfidenceBasedAccuracyEstimator):
             classifier=classifier,
             quantifier=quantifier,
             confidence=confidence,
-            collapse_false=collapse_false,
         )
+        self.extpol = ExtensionPolicy(collapse_false=collapse_false)
         self.e_train = None
 
     def _get_pred_ext(self, pred_proba: np.ndarray):
@@ -176,6 +169,10 @@ class MultiClassAccuracyEstimator(ConfidenceBasedAccuracyEstimator):
                 estim_prev = np.insert(estim_prev, _cls, [0.0], axis=0)
         return estim_prev
 
+    @property
+    def collapse_false(self):
+        return self.extpol.collapse_false
+
 
 class BinaryQuantifierAccuracyEstimator(ConfidenceBasedAccuracyEstimator):
     def __init__(
@@ -183,7 +180,6 @@ class BinaryQuantifierAccuracyEstimator(ConfidenceBasedAccuracyEstimator):
         classifier: BaseEstimator,
         quantifier: BaseAccuracyEstimator,
         confidence: str = None,
-        collapse_false=False,
     ):
         super().__init__(
             classifier=classifier,