Thanks for getting back to us, @abides.
Allow me to chime in for a moment and share some additional insights about recording security deposit payments in QuickBooks Online (QBO).
Since those payments are already in your bank account already, you can use the Transfer feature. This will help you transfer funds from your one account to another. Here's how:
1. On your QBO, go to the Plus icon at the top, then pick Transfer under Other column.
2. Select your bank account on the Transfer Funds From drop-down.
3. On the Transfer Funds To, pick Other Current Liability, then enter the Transfer Amount, Memo, and Date.
4. Click Save and close.
For your reference, you can also check out this article for more information: Transfer funds between accounts.
That should do it. Please let me know how it goes by leaving a comment on this thread. I'd be glad to answer if you have any follow-up questions or concerns. Wishing you and your business continued success!