How do i process a underpayment of .27 cents. its not worth sending a reminder for 27 cents.

Hello there, zoelectricllc.

We can consider the remaining amount as bad debt because your customer will no longer pay it. Here are the steps that we can take:

1. Check your aging accounts receivable.

2. Create a bad debts expense account.

3. Create a bad debt item.

4. Create a credit memo for the bad debt.

5. Apply the credit memo to the invoice.

6. Run a bad debts report.

You can browse this link to see the detailed instructions on every steps: Write off bad debt in QuickBooks Online.

Though that,s how we do it in QuickBooks Online, we'd still recommend reaching out to your accountant. They know what's best for you and your books. 

Keep us posted if you need anything else. Have a great day!

I am not sure if QB online receive payments screen is the same as my version.  In my version of QB when posting a customer payment in the receive payments window and there is a miscellaneous difference, I use the "button" at the top that is marked "discounts and credits".  A two tab box comes up, using the tab marked "discount" just put in the miscellaneous difference amount and choose an account to post it to (I use miscellaneous).   I hope this helps you.