diff --git a/src/model/Category.hpp b/src/model/Category.hpp
index 2c17377..ead5511 100644
--- a/src/model/Category.hpp
+++ b/src/model/Category.hpp
@@ -33,6 +33,14 @@ struct Category
     QString font;
     bool fix_cost;
 
+    bool operator() (const Category& cat1, const Category& cat2) const
+    {
+        if (cat1.fix_cost) return true;
+        if (cat2.fix_cost) return false;
+
+        return cat1.name < cat2.name;
+    }
+
     bool operator == (int catId)
     {
         return id == catId;
diff --git a/src/model/User.cpp b/src/model/User.cpp
index dd6fa5d..76468f4 100644
--- a/src/model/User.cpp
+++ b/src/model/User.cpp
@@ -45,6 +45,9 @@ void User::InvalidateOperations()
     }
 
     _operations.clear();
+
+    std::sort(_accounts.begin(), _accounts.end(), Account());
+    std::sort(_categories.begin(), _categories.end(), Category());
 }
 
 Category User::GetCategory(int catId)