Tax liability?

A tax liability is based on taxable income and possible credits that may be applied. And taxable income is based on all sorts of different income, possible deductions, itemizing, exemptions, etc, etc.

And all of that is based on gazillions of pages of tax code. Which is different for every country.

Meaning there are infinite possibilities of what this tax liability could be.

I'm not sure how you think someone can just simply answer this.