Not known. Probably.
Any that I have to pay.
Harold, thank you prompt reply.If your Austrian client is VAT registered than you can zero-rate the supply.If your customer is not then the supply of service would be vatable and you should charge VAT at standard rate.There are rules governing the place of supply and these are covered here
You can only recover VAT in Austria if you are registerd there.
I hope this is helpful and answers your question.
If you have any other questions, please ask me before you rate my service – I’ll be happy to respond.