Any expenses you had because of the sale plus add improvements made to your basis.
I can post items that would be deductible were it a rental home. You can see if any apply to you.
A boat slip would not fall under any regular investment classification. You may enter it as "Everything Else". Note that any gain or loss would be reported as Long-Term or Short-Term Capital Gain/Loss and taxed as such.
Can expenses such as Property Tax, Loan interest, insurance, or slip rental be included in the cost basis when determining capital gains from the sale of the boat? I am selling a boat for more than I paid for it, and the capital gains tax may be very high.
No. The expenses you describe are all ordinary and necessary personal expenses for owning and using/operating the boat but do not improve or increase the value of the boat itself. Only expenses that are capital improvements to the boat itself are considered part of the cost basis.
You can include any expenses paid to make and close the sale of the boat.
You stated below that "You can include any expenses paid to make and close the sale of the boat." We sold our charter boat this year and incurred expenses to fix some items the buyer wanted in order to close the sale, as well as expenses just to get the boat ready to sale. For example, we hauled the boat and had the bottom painted (approx. $2,000) prior to listing it. If these kinds of expenses are deductible, how do we enter them in TT?