I've only done my taxes with FreeTaxUSA, but I think I'll have to pay up for TaxSlayer for this year's taxes because FreeTaxUSA don't support a specific state form I need to file to save me money (Annualized income installment method for calculating estimated taxes). I did message FreeTaxUSA about supporting that about 2 years ago because I knew I was going to need it at some point.
That's too bad. State tax return forms are the worst. A lot of states don't have the resources to fine-tune their form design, and the instructions are often poorly written.
