That depends on what version of the software you use. it could be anywhere from free to several hundred dollars. And there is online software or desktop (CD/download) software to choose from. Do you want a web-based software or do you want to install it to your own hard drive?
Online software versions:
Online software with live help from a CPA
Desktop software (CD/download to your own computer)
When you use Online TurboTax, you get one return per fee. Each return needs its own account and user ID. If you use the same account and user ID for a second return, you overwrite the first one and lose it forever.
When you use Desktop TurboTax, which you install from a CD or download to your own hard drive, you can prepare and e-file multiple returns for the cost of the software. You can e-file up to 5 Federal returns—more if you mail the additional ones. If you have multiple returns to prepare for family members, Desktop is more cost effective.
Desktop --unless you specifically buy federal Deluxe only from a retailer-- will include the software for one specific state. You can prepare as many returns for that state as the number of federal returns you prepare. E-filing state returns is an extra fee which can be avoided by printing and mailing the states. Additional--other--state software is an additional fee for the software.
There is also The Turbo Tax Free File program which is free for federal and state. And has more forms than the Federal Free Edition, like Schedules A, B, C , D, E, F, EIC, H, K-1, SE, etc.
To qualify for the Free File website you just need to meet one of these 3 things.
AGI $36,000 or less.
Active duty military with AGI of $69,000 or less
OR qualify for EIC (earned income credit.)
In order to use the Free File program, you have to start it at a special website. Click on Sign in at the top right. It may let you continue your return so you don't have to start over.