diff --git a/account_tax_balance/__init__.py b/account_tax_balance/__init__.py
index 4d7a49b5..ffc9ac9c 100644
--- a/account_tax_balance/__init__.py
+++ b/account_tax_balance/__init__.py
@@ -2,3 +2,4 @@
 
 from . import models
 from . import wizard
+from .hooks import pre_init_hook
diff --git a/account_tax_balance/__manifest__.py b/account_tax_balance/__manifest__.py
index abea8ccd..7ff7567a 100644
--- a/account_tax_balance/__manifest__.py
+++ b/account_tax_balance/__manifest__.py
@@ -20,4 +20,5 @@
         "views/account_tax_view.xml",
     ],
     "images": ["images/tax_balance.png"],
+    "pre_init_hook": "pre_init_hook",
 }
diff --git a/account_tax_balance/hooks.py b/account_tax_balance/hooks.py
new file mode 100644
index 00000000..2fa89e8e
--- /dev/null
+++ b/account_tax_balance/hooks.py
@@ -0,0 +1,75 @@
+# © 2020 Opener B.V. <https://opener.amsterdam>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+import logging
+
+
+def pre_init_hook(cr):
+    """ Precreate move_type and fill with appropriate values to prevent
+    a MemoryError when the ORM attempts to call its compute method on a large
+    amount of preexisting moves. Note that the order of the mapping is
+    important as one move can have move lines on accounts of multiple types
+    and the move type is set in the order of precedence. """
+    logger = logging.getLogger(__name__)
+    logger.info('Add account_move.move_type column if it does not yet exist')
+    cr.execute(
+        "ALTER TABLE account_move ADD COLUMN IF NOT EXISTS move_type VARCHAR")
+    cr.execute(
+        """
+        UPDATE account_move am SET move_type = 'liquidity'
+        FROM account_move_line aml
+        WHERE aml.account_id IN (
+            SELECT id FROM account_account
+            WHERE internal_type = 'liquidity')
+        AND aml.move_id = am.id AND am.move_type IS NULL
+        """)
+    logger.info('%s move set to type liquidity', cr.rowcount)
+    cr.execute(
+        """
+        UPDATE account_move am SET move_type = 'payable'
+        FROM account_move_line aml
+        WHERE aml.account_id IN (
+            SELECT id FROM account_account
+            WHERE internal_type = 'payable')
+        AND aml.move_id = am.id AND am.move_type IS NULL
+        AND aml.balance < 0
+        """)
+    logger.info('%s move set to type payable', cr.rowcount)
+    cr.execute(
+        """
+        UPDATE account_move am SET move_type = 'payable_refund'
+        FROM account_move_line aml
+        WHERE aml.account_id IN (
+            SELECT id FROM account_account
+            WHERE internal_type = 'payable')
+        AND aml.move_id = am.id AND am.move_type IS NULL
+        AND aml.balance >= 0
+        """)
+    logger.info('%s move set to type payable_refund', cr.rowcount)
+    cr.execute(
+        """
+        UPDATE account_move am SET move_type = 'receivable'
+        FROM account_move_line aml
+        WHERE aml.account_id IN (
+            SELECT id FROM account_account
+            WHERE internal_type = 'receivable')
+        AND aml.move_id = am.id AND am.move_type IS NULL
+        AND aml.balance > 0
+        """)
+    logger.info('%s move set to type receivable', cr.rowcount)
+    cr.execute(
+        """
+        UPDATE account_move am SET move_type = 'receivable_refund'
+        FROM account_move_line aml
+        WHERE aml.account_id IN (
+            SELECT id FROM account_account
+            WHERE internal_type = 'receivable')
+        AND aml.move_id = am.id AND am.move_type IS NULL
+        AND aml.balance <= 0
+        """)
+    logger.info('%s move set to type receivable_refund', cr.rowcount)
+    cr.execute(
+        """
+        UPDATE account_move am SET move_type = 'other'
+        WHERE am.move_type IS NULL
+        """)
+    logger.info('%s move set to type other', cr.rowcount)