Self employed Austria tax number problem

[Cadams]

Hi

Please can anyone help me with this.
I am self employed in the uk and working for one month in Austria, I have invoiced the company and at their request given them my uk schedule d tax reference and my vat number. They are saying that I haven't given them the right number and they will have to with hold a large amount in tax.
Can anyone help me to understand what number they are looking for?

Any help would be much appreciated , thanks

[GlobalTaxAdviser]

I think since you are self employed and actually working in Austria even though its only a month. They may expect you to register with the Austrian Tax Authorities and file a tax return there. When you register you will be given a tax number

Kind regards

GTA

[bd6759]

Read this

https://english.bmf.gv.at/taxation/Reli ... trian.html