Hi Ender
Yes, there is an easier method in SalesAnalysis. You should add the Amount field as a selected field 12 times, each time changing the Field Title, specifying "MTD" as the Date Range, and changing the Interval from 0 to 11 for each instance. Then when you view the inquiry, choose the ending date. It will put all 12 months side-by-side.
You should post the tax question as a different topic. It's best not to combine two unrelated subjects in one topic (by the way, I don't know that answer to that one)
Steve