It won't affect your customers as long as they can get updated tax tables every year.

>Sage Software, the purchaser of ACCPAC, the purchaser of SBT, announced this week that it is "retiring" Sage Pro, the current iteration of SBT's 1995 smash VFP hit, Pro Series.
>Among other things, Sage cited Microsoft's plan to stop supporting VFP as a reason.
>
>Between 1995 and 2000 many of us were keeping large staffs busy selling and supporting Pro Series. It was, and still is, one of the most versatile accounting systems ever developed, principally because Bob Davies, SBT's founder, had the vision to supply source code with the product.
>
>Because our clients have the source code, Sage's decision will have little impact on our clients and as long as VFP runs Pro Series will be a viable product.
>
>The last I heard Bob has retired and was sailing in Caribbean.
>Pro Series can now join him.
>
>Under the "What will these guys stoop to next" heading the announcement from Sage urged Pro Series customers not to drop their annual support payments although Sage will not longer be selling or supporting the product.
>
>Huh???