Can I retrieve old invoices from a previous account? I have upgraded.

It's my pleasure to help share some insights, @info494.

Upgrading to a different plan won't affect the data created in your company. Your previous transactions from the previous plan will still be in your account after the upgrade.

However, if your previous company account was cancelled, your data will only be available in read-only access. You can refer to this article for more details: What happens to my QuickBooks Online data after I cancel?

If you've migrated from Desktop to Online, you can check out this link about the data changes: What data doesn't convert from QuickBooks Desktop to QuickBooks Online?

Let me know which scenario applies to you. I'll be here to help you further with your historical transactions.