Can I get a patent for an innovative financial advisory software?

Yes you can. You might look at both software claims and business method claims.

My advice is re the US only.

I have to provide a cautionary word here as opposed to Mark's positive statement - over recent years, both software and business methods have been under attack, so obtaining a patent for such is in no way a sure thing.

The answer is yes. Both software and business methods are patentable subject matter in the U.S. However, the U.S. patent laws are strict as to scope and coverage granted for such patents. It is becoming very difficult to receive a patent on a business method, and while the press may make it seem the same software patents, such is not the case. Patenting software is very much possible, as in the past. The strategies have changed over time though, and I'd recommend consulting a patent attorney.