Thank you for posting here, @la123.
Let me share my ideas about assisting your client's company using QuickBooks Desktop (QBDT).
Fiat Lux – ASIA is correct about purchasing or managing the two companies under one license. Since QBDT allows multiple companies under one license, you can create another company in your application for the other one. Nonetheless, you can add numerous companies with different EINs separately to record the taxes correctly.
To do that, you can follow the steps below:
- Open your QBDT company file.
- Select Create a new company in the No Company Open window.
- Choose the option you want when setting up the company. You can either Express Start/Start Setup or Detailed Start.
- Follow the onscreen steps to finish the setup and select Start Working.
On the other hand, regarding your option of backing up your company file. If you feel confident with this process, you can also opt for that one. Additionally, if you're the only one accessing the company, you can purchase a single license QBDT. Otherwise, you can opt for a multi-user company.
Take a look at this article for more information: Create QuickBooks Desktop Company file: Overview.
I've also got an article for your reference about creating a new company file to replace your existing company file: Create a new company file from an existing one.
If you have more questions about managing multiple companies in QuickBooks Desktop, click the Reply button. I'm always here to help.
