Posted: Tue Nov 13, 2018 5:40am
One of my pet peeves is that people refer to 'the SUMA' as though it is a tax, whereas it isn't. SUMA are just a tax collection agency, and collect council tax (IBI), car tax, and in our case taxes for maintaining the irrigation canals and/or use of ground water. As you've surmised, in your case 'SUMA' is IBI.
As a non-resident, you'll also have to pay non-resident tax, which is done annually in arrears. There's lots of information already on the forum so have a browse. Look for e.g. 210 (the tax return) and Spanish Tax Forms (the cheapest way of getting someone to do it).
Non-resident tax isn't very costly. At the moment it's 19% of 1.1% of the catastral value. Post Brexit the 19% will probably change to 24.75%.
If you let out the property, there are a lot of hoops to jump through, and a tax return would be due for every quarter in which it's let out.