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The F24 is a form to pay imposte (IMu, TASI, TARI etc) to government agencies.   It can be paid in any bank or post office.  It is free to pay - either with cash, or directly from your bank account in your bank. 

Thanks. I understand that these taxes are self-assessed, and that part of the calculation involves the "cadastral value" of the property. I don't know what that value is, and am having no success in discovering it. Without it I can't pay the commune the (unknown) amounts that they require. Is there some kind of register that I can consult?

It should be on your house deeds when buying. Alternatively get in touch with the commune who should be able to access the details.

The cadastral valueis on your act of sale, unless the rate has been adjusted following restoration work.   I would suggest that you visit a CAF or go to the comune to sort out what you owe as there are also amounts to add for late payment etc.  Then once you are up to date with your payments you can start to use the online tools to calculate what you owe. 

Using the above website will, apart from calculating amount due, will also calculate interest for late payment. If you want details about how to fill in, once you have established valore catestale and the categoria usually Cat A (tranne 10) for most dwellings then let me know 

Its a good site, but you need to know your comunes rates, and it wont do arrears of more than 1 yearr.