Would it? Seems like a conflict of interest to me. Down the road the government might be tempted to abuse its control of both tax laws and ubiquitous tax preparation software.
I think it would be better if:
- Tax laws and tax law updates are required to be released in machine-readable format (i.e. JSON) using a machine-parsable protocol (i.e. converted from "English" to "Tax Grammar")
- IRS was required to maintain a public API for submitting returns
This would lower barrier-to-entry of tax filing software and weaken incumbents' (i.e. Intuit's) lobbying power. Furthermore, IRS is free to build a tool if they want, so long as it is both open source and dogfoods the public API and public tax law data that everyone else has access to.