If you are using XpenseTracker, the answer is not yet. The next update will allow you to sync your devices using iCloud.
If you are using BizXpenseTracker, you have the option to use the Device Sync feature with iCloud. If you have iCloud enabled on your device, then you go into the Prefs screen and scroll to the section named "Sync Services." Then choose iCloud. For further instructions, please visit our Device Sync help page at: http://www.silverwaresoftware.com/DeviceSync.html