Hi QB Team, we have a problem with opening the VAT liability report. How we can fix this?

Hello there, @marko-c.

I want to make sure you'll get all the necessary details when accessing the VAT Liability report in QuickBooks Online (QBO). 

For the time being, a few users are getting the same behavior when opening the VAT Liability report. This is already reported as an ongoing issue and our product engineers are actively working to have this resolved as soon as possible. This way, you can get back to business and continue managing your taxes.

In line with this, I encourage you to contact our Customer Care team (via chat). They can add your account to the list of affected users. This ensures you're in the loop about the investigation's status and its fix. You can provide the INV-57948 to our representative as your reference.

In the meantime, I'm adding this article to further guide you in managing your VAT transactions using QBO: QuickBooks Help Articles. It includes topics about VAT feature updates, sales tax agencies, and adjustments, to name a few.

In case you have other VAT concerns in QBO, let me know in the comments below. I'll be glad to help. Take care and stay safe.