is it possible that after bank disconnects after 90 days and upon reconnection, bank balances do not match?

Nice to meet you, Mukesh.

I'll be pleased to offer some insights on addressing discrepancies in bank balances in QuickBooks Online (QBO) following reconnection.

Yes, it is possible for bank balances to not match in QuickBooks Online after a bank disconnects and reconnects following 90 days. During the disconnection, any transactions that occurred will not be recorded in QuickBooks, which can lead to discrepancies in balances once the bank is reconnected. Additionally, manual adjustments or changes in the bank's records during the downtime could contribute to the mismatched balances.

To address discrepancies and bank balances in QBO, you'll need to perform manual updates. These updates download any new transactions from the past 90 days, ensuring the most current information is retrieved when you connect to your account, even if there are gaps between updates. To manually update banking transaction information:

1. Go to Transactions and select Bank Transactions.
2. Select Update.
3. If prompted, enter your Multi-Factor Authentication (MFA) credentials and select Continue update. You must enter these credentials within 2 minutes of being prompted. Multi-factor authentication is any security precaution that requests more than a single username and password.

After reconnecting, you'll need to review your bank statements by obtaining them for the period your bank was disconnected and comparing these statements with the transactions recorded in QBO. Identify any transactions that appear on the bank statement in QBO, and manually enter these missing transactions.  Additionally, check for duplicate entries to ensure no duplicate transactions were entered during the manual update or after reconnection.

Following these steps allows you to resolve and rectify any discrepancies in your bank balances following a disconnection period in QuickBooks Online.

Furthermore, you can refer to this article for various steps to resolve issues when downloaded transactions are missing: What to do if you can’t find downloaded bank transactions.

Moreover, you can check on how to categorize and match online bank transactions for accurate financial records. You can also scan this article to find out what to do if QuickBooks can't find the right match or matches the wrong transactions in QuickBooks Online.

If you have other banking concerns, please don't hesitate to reply below, @MUKESH11. I'll be glad to help. Take care always!