There is not a function in QuickBooks to unvoid a voided invoice. I suggest you re-enter it, using the exact information from the original invoice, including the date and invoice number. Then delete the voided one.
If there was a customer payment applied to the original invoice, you will need to re-apply it to the new invoice.
I hope this answers your question about a voided invoice. Take care and thanks for writing.
My name is Jennifer Johnson and I’ve worked in the accounting industry since 1992, mostly as a freelance bookkeeper and QuickBooks consultant for small, privately-held firms. I had clients across the country and was certified in QuickBooks from about 2004 to 2011. I wrote a number of ebooks about QuickBooks during that time. In 2011 I accepted a full-time staff position with my largest client, and sold my bookkeeping practice. I finished my undergraduate degree in accounting in 2016, and then my masters in accountancy in 2018. I now teach accounting at the University of Illinois Urbana-Champaign, one of the top accountancy programs in the United States, if not the world. AMDG
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