Ha yes I almost edited my comment earlier to mention that calculating tax is probably something most people should just outsource to a third party. I also have

Ha yes I almost edited my comment earlier to mention that calculating tax is probably something most people should just outsource to a third party. I also have experience with wage tax calculation systems, and the solution we went with was browser automation that used a third party wage tax calculator. That stuff can be impossibly complicated -- and with many governments it changes every year too!