I have done tax refund estimates in with other tax agencies and they come up more than with turbo. Why is that?

You have to compare the Form 1040 from TurboTax and the Form 1040 from the other software line by line to see where the difference is.

Please double check your information. You will not receive an increase on another tax software. It will be the same as long as the information is input correctly. 

Also, please do not rely on tax refund estimator as everyone who files has different circumstances. 

Hope this helps!