Self employed

Yes, you can claim your self-employment expenses up to the time you ended your business.  If you want to include expenses for a conference you attended,  you may want to state the business closing date as occurring after the conference, if you have related travel expenses.  

TurboTax will automatically put Medicare premiums on Schedule A unless you enter them on Schedule C as a business expense. The premiums can't exceed your net business income, so if you had a loss, stick to Schedule A. 

If you had a Net Operating Loss, you need to enter the amount yourself; TurboTax does not calculate it for you, but does calculate it in your return when you enter it.  You can carry forward your loss until it is used up. NOL is limited to 80% of the taxable income that year. 

Type 'NOL' in the Search area to get to this section of the program.  You may want to go back to the year you first had an NOL and Amend to add it, then you can carry forward from there.

See IRS Publication 536 for details.