Hi there, we bought a house in January and I've

You need an F24 semplificato, which you complete with your anagrpahical details.

In the boxes below check EL, , the tribute code which if its just a house will be 3918, put in your ISTAT code for your comune,  check the S box, the number of buildings you are paying IMU for, the year, and the amount.   Thats all. 

As to the calculation, it depends on your comune, the catastal value of your property, and the aliquota the comune has set.  I would call the IMU office of your comune and ask them for help.

As a further note - not all land is exempt.  You are at sea level so I presume you would pay on land unless it is exempt for some reason. 

Thanks for your message. I did ring the comune to ask about this but we have to do everything by email because they're working from home due to Covid.

They emailed me the Dichiarazione form to complete, and I have got back to them with some questions, but I wondered if anyone knew the answers in the meantime as they have never been that quick to respond!

They also sent me the document with the rates in, and I will complete the calculation as I think it should be done, but I am keen at some point to get a definitive way of doing it so I know that I am doing it right!

You could also get in touch with your local CAF who will calculate it for you for a small fee.  OTherwise pay what you think is right, and then you can always make up any difference next year, once the comune offices are open again.  

I'm surprised the comune has not simply told you how much you need to pay. I would have a look on their website for future information. You can use this calculator here, but as Modi has said CAF will cost little.

Thank you all. This morning I did eventually manage to speak to someone at the comune, I have emailed him with further information and fingers crossed he will be able to give me a figure. Thanks again for taking the time to reply. ?