How do I correctly post payment by check for an invoice? It shows up as "cash" when I look for it even though I posted it as income.

Hi, peggyglaub. 

Let me get the help you need about Invoices in QuickBooks Self-Employed.

 When marking the Invoice as Paid, it will not automatically tag this as income since the Invoices are for tracking purposes only.

If your bank account is connected where the payment is deposited, all you need to do is to categorize the transaction as income. Otherwise, you can assign the created invoices as an income by manually adding and categorizing the payment inside QBSE.

Let me show you how: 

1. Go to the Transactions from the left panel.
2. Click the Add transaction button.
3. Enter the date of the payment under DATE.
4. Fill in a brief description of the transaction. 
5. Type the amount under AMOUNT. 
6. Choose a category for the transaction (in this particular case, we want to select Income). 
7. Click Save. 

You can browse this article to learn more about categorizing your transaction as Business Income in QuickBooks Self-Employed: Manually add transactions in QuickBooks Self-Employed.

Note: Make sure to select the correct date range when running a report. 

If the issue still persists,  let’s perform some basic troubleshooting steps to make sure the issue isn’t browser-related. It’s possible that local internet cache files are the reason for this unexpected behavior. 

Let’s start logging in to QuickBooks using a private window. Here’s how:

•    Ctrl + Shift + P (Internet Explorer)
•    Command + Shift + N (Safari)
•    Ctrl+ Shift + N (Google Chrome)
•    Ctrl + Shift + P (Mozilla Firefox)

When that works, delete or disable cache and temporary internet files to boost browser-related issues. Some stored data can impact the information being transmitted, thus causing the error to show up when uploading the forms.

As an alternative, make sure to use other supported browsers to get the best out of your QuickBooks experience.

To know more on how the Invoice feature works in QuickBooks Self-Employed, visit these articles: 

• Create an invoice in QuickBooks Self-Employed
• What's new with QuickBooks Self-Employed Invoicing?

Please let us know if you need further assistance in managing your invoices in QuickBooks Self-Employed. I'm always here to help you in any way I can. Have a wonderful day.