If you had four jobs last year what tax form do you use?

You need the W2s from all the jobs.

Just use H&R block. If you're income is low enought you can do it online for cheap or free. If higher income buy TaxCut. It's only about $20, and well worth it. Online or with TaxCut it's very user-friendly and they have good support. http://www.hrblock.com/ My wife and I did it online, they set us up with direct deposit. We already got our return, and it was more than we expected. My dad has used TaxCut for years.

the same as if you had 1 job ... depends if you itemize deductions or not. If you use standard deductions ... it's 1040A. If you itemize ... it's the long form - 1040

all of them