How do the 3rd party SA software solutions (TaxCalc, ABC SA, etc) calculate tax liability? Do they have logic built into the system or do they query HMRC to get the tax calculations? I'm asking because I noticed that HMRC publishes an interface to get a tax calculation: https://github.com/hmrc/self-assessment-api
If the logic is built in, how do providers test that their calculation is correct? Does HMRC provide a set of "test cases" with solutions to test against?
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