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diff --git a/models/pos_session.py b/models/pos_session.py
index 409bb07..2e8e9f6 100644
--- a/models/pos_session.py
+++ b/models/pos_session.py
@@ -1,6 +1,10 @@
 # -*- coding: utf-8 -*-
+import logging
+
 from odoo import api, fields, models
 
+_logger = logging.getLogger(__name__)
+
 
 class PosSession(models.Model):
     _inherit = "pos.session"
@@ -48,11 +52,25 @@ class PosSession(models.Model):
         return res
 
     def set_cashbox_pos(self, cashbox_value: int, notes: str):
+        _logger.debug(
+            "POS cash opening adjustment: set_cashbox_pos called for session_ids=%s, cashbox_value=%s, notes=%s",
+            self.ids,
+            cashbox_value,
+            notes,
+        )
         for session in self:
             expected = session.opening_cash_expected if session.config_id.cash_control else 0.0
             if not session.config_id.cash_control:
                 expected = session.cash_register_balance_start or 0.0
             difference = cashbox_value - (expected or 0.0)
+            _logger.debug(
+                "POS cash opening adjustment: session=%s expected=%s counted=%s difference=%s cash_control=%s",
+                session.id,
+                expected,
+                cashbox_value,
+                difference,
+                session.config_id.cash_control,
+            )
             session.write({
                 "state": "opened",
                 "opening_notes": notes,
@@ -63,6 +81,31 @@ class PosSession(models.Model):
             session._post_cash_details_message("Opening", difference, notes)
         return True
 
+    def _get_opening_float_amount(self):
+        self.ensure_one()
+        if not self.config_id.cash_control:
+            return 0.0
+        opening_amount = self.opening_cash_counted
+        if self.currency_id.is_zero(opening_amount or 0.0):
+            opening_amount = self.opening_cash_expected
+        return opening_amount or 0.0
+
+    def _post_statement_difference(self, amount, is_opening):
+        for session in self:
+            session_amount = amount
+            if not is_opening and session.config_id.cash_control:
+                opening_float = session._get_opening_float_amount()
+                if opening_float and session.currency_id.is_zero(session_amount + opening_float):
+                    _logger.debug(
+                        "POS cash opening adjustment: skipping difference posting for session %s "
+                        "because it solely matches the opening float (amount=%s, opening_float=%s).",
+                        session.id,
+                        session_amount,
+                        opening_float,
+                    )
+                    continue
+            super(PosSession, session)._post_statement_difference(session_amount, is_opening)
+
     @api.depends("payment_method_ids", "order_ids", "cash_register_balance_start", "cash_real_transaction", "statement_line_ids")
     def _compute_cash_balance(self):
         for session in self: