Posted: Wed Jan 5, 2022 9:20am
Reading between the lines it sounds like you have a private arrangement with your family but are worried that formalising it with a rental agreement would potentially expose them to tax liabity which they are currently avoiding if not deliberately evading.
When an owner rents out a property then whether it's to a family member or not then they must declare the income. Any tax which may fall due will depend on their circumstances.
What exactly do you mean by 'residency application'?
If you mean via an NLV then for that you are not required to show that you have property or accommodation in place therefore a rental contract will be of no value to you.
If on the other hand you're applying under the Withdrawal Agreement on the basis that you were living in Spain prior to Dec 32st 2020 then in that case yes, you will need to show either property deeds or a rental agreement and very probably also Padron.
I confess that I haven't fully kept up with that scenario so not sure that's even a valid route anymore, wasn't there a Dec 31st 2021 deadline?