Can I save and return later to finish

You can certainly save and come back to it later. 

To save your data using the TurboTax Online version follow these steps:

1. Click on 'My Account' (that's located in the upper right-hand corner.)
2. Next, click 'Save and Sign Out.'
3. When you sign back in, click on 'Take me to my return.'
4. Then, click 'Pick up where I left off.'
   

To save your data using TurboTax Desktop version follow these steps:

1. Click on 'File' (in the far left-hand corner.)
2. Next, click 'Save'. (The first time you save it will ask you where you'd like to save it and what you'd like to name the file.)
3. When you re-open the program, just click on 'continue' and it will take you to where you left off.