@classmethod
def get_default_tax(cls):
    issuer_country_code = cls.get_issuer_country_code()
    try:
        return cls.EU_COUNTRIES_VAT[issuer_country_code]
    except KeyError:
        raise ImproperlyConfigured('EUTaxationPolicy requires that issuer country is in EU')
@classmethod
def get_default_tax(cls):
    issuer_country_code = cls.get_issuer_country_code()
    try:
        return cls.EU_COUNTRIES_VAT[issuer_country_code]
    except KeyError:
        raise ImproperlyConfigured('EUTaxationPolicy requires that issuer country is in EU')