The new federal tax law could be some very good news if you’re thinking about buying a boat for a charter business. Under the new law, if you buy a new or brokerage boat from Jan.1 of this year through 2022 and use it in a charter or other business activity, you can score some significant tax savings. You may even be able to deduct the whole purchase price, plus improvements. According to interpretations of the new law from United Yacht Sales and Bluewater Yacht Sales, it has some fairly dramatic, and lucrative, benefits for boat owners. The details: You…