Leaving Spain, tax deregistration form 030.

Hola

I am planning to leave Spain for good  in the next month or two.  I've searched previous expat threads and it looks like the deregistration with police, padron and medical card is quite easy. The problem may come up with the deregistration for tax in hacienda. I've read that I will need to provide a residency certificate from another country for them to deregister me and get it translated etc. In my case I'm not going straight back to UK, but planning to spend some time with friends in France and then maybe go to Asia travelling but I'm not really decided.

So how do you fill in the form if you don't know?
What would happen if I just didn't do it?

I'd prefer to do it properly and get off the Spanish system rather than just clearing off and leave it hanging, but they don't make it easy for you tbh.

thanks for any advice.

The fact is in the present day you have to be registered somewhere for tax. You cannot simply drop off the radar. What would happen in practice is you would end up getting a back tax bill from the last known place of registration.. It depends of course on your liability for income tax. You could register with the HMRC and obtain a certificate to send on to the Hacienda which is the usual practice. However you would need a UK address. Or just leave things as they are and submit an annual tax return in Spain if your liability exceeds the allowances.