H&R Block Online
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VisitFree Online may suit people with simple tax situations that fit its Form 1040 and limited-schedule support. Other listed plans address homeowners, investors, rental income, and self-employment.
OpenTax may suit tax and accounting firms, freelancers with S-corp clients, advisory engagements, and financial planners seeking computation beneath AI workflows. It also fits developers looking for hosted or self-hosted interfaces to tax computations.