Capital Gain on sale of land

Assuming you sold the land for a gain, then yes, you will be subject to long term capital gains on the sale of the land.  

Typically, you will receive IRS Form 1099-S from the sale of the land for the amount of the proceeds on the sale.  This is an IRS form that shows the date of the closing, the gross proceeds from the sale, as well as other information.  See the sample form below.

You will enter this information into TurboTax in the federal interview section as follows:

1. Select Income & Expenses 
2. Scroll down through all income until you see Investment income 
3. Select Stocks, Mutual Funds, Bonds, Other 
4. Select Add more sales 
5. Proceed through the questions and enter the information as prompted