When I enter a payment the system is automatically applying it to the wrong invoice. It is wreaking havoc in my accounts

My main goal is to ensure the payments are applied to the correct invoices, Jess. I'm here to share the cause of the issue and the steps to prevent this.

First, let's verify if the Automatically apply credits feature is turned off.  It'll help us determine if this is the cause of why the system is automatically applying the payments to the wrong invoices.

Here's how:

1. Go to the Gear icon and select Account and settings.
2. Choose the Advanced tab.
3. Select Edit in the Automation section.
4. Turn off the option (if on) to decide which open invoices you wish to apply credit memos to.
5. Select Save, then Done.

To remove the credit and ensure the correct payment is applied to the invoice, I suggest following the steps below:

1. Open the invoice that has the incorrect credits applied. 
2. Select More and then Delete.
3. Hit Yes to confirm.
4. Once done, go to the Receive payment, select the correct invoice, and enter the amount.

If the option is off, I recommend accessing your QuickBooks Online account via the private window. Doing so will help us check if this is a cache-related issue. Excessive cache or saved data can cause system issues or affect the program's performance.

When using incognito mode, it'll assist us in determining its exact cause since this doesn't save your browsing history and doesn't accumulate cache. Here are the keyboard shortcuts: 

• Safari: Command + Shift + N 
• Google Chrome: CTRL + Shift + N
• Mozilla Firefox or Microsoft Edge: CTRL + Shift + N

Once logged in, enter a payment again. If it applies to the correct invoice, clear the browser's cache. Doing so improves system performance, fixes program problems, and frees storage space. Using other supported browsers also helps us verify if this is a browser-specific problem. 

To rectify the previous transaction, please see this article: Fix a payment applied to the wrong invoice in QuickBooks Online.

Additionally, I've added these resources to help you view your customers' outstanding balances to know who is falling behind their payments and send reminders about their due dates:

• Run an accounts receivable aging report
• Send invoice reminders automatically or manually

If you need additional assistance receiving payments and creating an invoice or credit memo, please don't hesitate to get back on this thread. My team and I are always ready to help you.