Posted: Mon Jun 13, 2022 2:38pm
Phil. As you live in Mojacar, call Indalo Partners at the Parque Comercial. You should initially go non-resident in UK to obtain a Zero tax code. Then Indalo will obtain a Fiscal certificate of tax residency in Spain, and process your claim with HMRC. It gets difficult claiming back tax from UK if over 4 years ago. However it is done , you should not be liable for double taxation if you have a TIE in Spain.
If you are still resident in UK, DO NOT sign on to local padron. You will however be liable for a small non-resident tax here if you are on 90-day rule for holiday home owner for example.
Here is a link to calculate your tax liability when resident in Spain. Use the 'advanced' button to input your age, and circumstances, earnings etc. This is quite accurate. For 2021 use £1 = €1.16 exchange
https://www.icalculator.info/spain.html
ll your earnings, even eg if ex-military or govt service pension already taxed in uk MUST be declared in Spain, usually around April/May for previous calendar year. Worldwide assets should also be declared here on a modelo 720 (shares/investments, accounts, or property worth more than €50k each). Failure to do so if you are already registered on local padron, and have NIE & TIE proving Sp residency, can (and does) fall foul of Hacienda rules, resulting in heavy fines. Talk to Indalo Partners they can sort you out.
Hope this helps you get your back-tax like I had to do.