TaxJar might be a bit more popular than Open Tax Solver. We know about 1 link to it since March 2021 and only 1 link to Open Tax Solver. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
There is open source software that one can use for the main flows and forms: https://sourceforge.net/projects/opentaxsolver/ It seems to work and will produce PDF of the forms with data filled in for one. I appreciated it. It will also handle some of the states. It took a while, but I did find how to check out via subversion: svn checkout 'https://svn.code.sf.net/p/opentaxsolver/SrcCodeRepo' I use subversion so... - Source: Hacker News / about 2 years ago
Might want to check out taxjar.com, I haven't used it but one thing they claim to do is help with this compliance. Source: almost 2 years ago
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