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Won't the previous return I finished for the most part be filed with the same name? 

The reason I ask is that I think I may have double added some of the information on a sale of mutual funds or information as our taxes owed us seem to jump by $2000 on federal and we owe the state more than $1000 over last years. 

I feel sure I've made an error somewhere so I thought best to just start over clean slate.