Sounds like you need an accountant.
replies(3):
I am looking to learn how others handle their VAT / Sales Tax filing.
I know that the standard answer would be to use Paddle / LemonSqueezy / Polar.sh, but I already have a lot of subscribers on Stripe which makes quick migration non-trivial.
I am especially looking for some reliable accounting companies / accountants that can register and file Sales Tax across US, UK, Canada, Australia, etc. (It does not have to be a global solution).
It's my understanding that solutions like Stripe Tax, Alavara, Quaderno, etc. only help collect the necessary data (which I consider the easier part, at least for digital goods), but do not handle the registration & filing (though I've learned that Quaderno will support filing Sales Tax in the US on your behalf soon).
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Some jurisdictions are relatively easy to handle (for example, one can handle whole EU by uploading a simple CSV [1] once a quarter and the CSV is easy to generate from Stripe's records).
But unfortunately there are tons of others that are much more complicated and scattered -- for example, due to the economic nexus laws in the US, I now have to file Sales Tax in each individual state where I am over the threshold (and many states have thresholds in low hundreds of transactions, so it's not hard to reach).
[1]: https://www.elster.de/bportal/helpGlobal?themaGlobal=osseust_import
[2]: If you do not feel comfortable commenting here, you can also reach out at z2qmk@pekoi.com (temporary email)
Accounting is important, but it's not the solution to the OP's problem. There are also questions of costs and efficiency, especially since we are talking about low-margin B2C sales.
MoR are great if you want absolutely no liability whatsoever, but especially considering there is no way for other countries to check you’re paying the right amount, I think doing it yourself isn’t too risky. (Not doing it is also a possibility.)