Is it possible to create a mock return? I have real estate that I am thinking of selling and would like to see/understand the tax implications. Thanks.

[mesquitebean]

To create a mock return in Online TurboTax you would have to set up a second online account to use as a "test account".     It won't charge you unless you decide to print.

Do NOT experiment in your current account with your already-filed return.    TurboTax saves your return after each screen, so you would overwrite your current return.

People using desktop software (CD/download) can prepare as many test returns as they want, or can use the "What-if" worksheet to compare situations.   That feature is not available in Online TurboTax.