There have been a lot of confusion about interstate shipping of wine recently. There have been some various positive court rulings in the recent past but the laws are state specific and since there are lots of small businesses involves, it takes a lot of time for this information to get widely distributed. I would think there would be some wine maker trade association that would push this information out proactively to all its members, but prehaps there isn't one unifing body that represents everyone.
In any case, this issue came to the forefront because my friend James was looking into getting some Sebastiani 2003 Sonoma Valley "Old Vines" Zinfandel shipped here to Ohio. I briefly wrote about that wine before in my little synopsis of our wine country trip. (Here's a hint...its heavenly). Anyway, James got word from the winery saying that they don't ship to Ohio. That set me off to do some searching to find out if this was because they legally can't, the process is cumbersome for the shipper or if they are just missing out on a market for their wines.
What I found is that they are missing out on a market. The Ohio Department of Commerce's Board of Liquor Control has defined the process for citizens to import wine. The document suggests that all the process is foisted upon the consumer by the regulation that the consumer fill out this form (PDF) and pay the required excise and sales tax. Also, the form says you have 30 days until after the importation to pay the taxes, so there shouldn't be anything that the shipper has to do regarding confirmation of paperwork filings or anything like that.
Also from the PDF Form is a listing of the actual excise tax rates. For wines up to 14% alcohol/volume the rate is $0.32/gallon or $0.76/case. Wines over 14% the rates are $1.00/gallon and $2.38/case. If you have a taste for the bubbly, then you will be paying $1.50/gallon or $3.57/case. Lastly, if you are importing Vermouth (and I am not sure why you would be), you must pay $1.10/gallon or $2.62/case.
Hopefully this sheds some light on the issue and the state web site can convince more wineries to direct ship.