Can the VAT still be adjusted after the sale of the first ticket?

No, once the first ticket has been sold, the VAT rate can no longer be adjusted. You can see which changes you can still make after the first ticket sale in this list: Possible adjustments after publication, the first ticket sale or after blocking tickets >

Why is it not possible to adjust the VAT afterwards?

Once the first ticket purchase has taken place, the tax rate is binding for all sales and ticket sales are based on a contractual agreement between the organiser and the buyer. The agreed VAT is part of this contract and changes could lead to legal problems.

Therefore, this tax rate can no longer be adjusted on the platform.

For all future events where tickets have not yet been sold, the tax rate can be adjusted.