**What**
- Adds a TaxRegion entity.
**For context: High-level design of the Tax module**
- A TaxRegion scopes tax rates to a geographical place.
- You can define tax regions on two levels: country-level, province-level (this corresponds to state in US contexts)
- Each Tax Region can have a default Tax Rate.
- [not yet done] - Each Tax Region can also have granularly defined tax rates for different products and shipping rates. For example, California can have a base rate for default products, but a reduced rate for groceries.
- Tax Rates specify if they can be combined with other rates - it's always the lowest level rate that wins.
The above allows a merchant to define their tax settings along the lines of this:
- Denmark (Region)
- Default rate: 25% (TaxRate)
- Germany (Region)
- Default rate: 19% (TaxRate)
- Reduced rate (books): 9% (TaxRate w. rule)
- United States (Region)
- Default rate: 0% (TaxRate)
- California: (Region)
- Default rate: 7.25% (TaxRate)
- Arkansas: (Region)
- Default rate: 6.5%
- Reduced rate (groceries): 0.125% (TaxRate w. rule)
The TaxModule can then receive a list of products and the shipping address to determine what tax rates apply to the line items.
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