bitwarden/src/Core/Models/Business/TaxInfo.cs

namespace Bit.Core.Models.Business
{
    public class TaxInfo
    {
        private string _taxIdNumber = null;
        private string _taxIdType = null;

        public string TaxIdNumber
        {
            get => _taxIdNumber;
            set
            {
                _taxIdNumber = value;
                _taxIdType = null;
            }
        }
        public string StripeTaxRateId { get; set; }
        public string BillingAddressLine1 { get; set; }
        public string BillingAddressLine2 { get; set; }
        public string BillingAddressCity { get; set; }
        public string BillingAddressState { get; set; }
        public string BillingAddressPostalCode { get; set; }
        public string BillingAddressCountry { get; set; } = "US";
        public string TaxIdType
        {
            get
            {
                if (string.IsNullOrWhiteSpace(BillingAddressCountry) ||
                    string.IsNullOrWhiteSpace(TaxIdNumber))
                {
                    return null;
                }
                if (!string.IsNullOrWhiteSpace(_taxIdType))
                {
                    return _taxIdType;
                }

                switch (BillingAddressCountry)
                {
                    case "AE":
                        _taxIdType = "ae_trn";
                        break;
                    case "AU":
                        _taxIdType = "au_abn";
                        break;
                    case "BR":
                        _taxIdType = "br_cnpj";
                        break;
                    case "CA":
                        // May break for those in Québec given the assumption of QST
                        if (BillingAddressState?.Contains("bec") ?? false)
                        {
                            _taxIdType = "ca_qst";
                            break;
                        }
                        _taxIdType = "ca_bn";
                        break;
                    case "CL":
                        _taxIdType = "cl_tin";
                        break;
                    case "AT":
                    case "BE":
                    case "BG":
                    case "CY":
                    case "CZ":
                    case "DE":
                    case "DK":
                    case "EE":
                    case "ES":
                    case "FI":
                    case "FR":
                    case "GB":
                    case "GR":
                    case "HR":
                    case "HU":
                    case "IE":
                    case "IT":
                    case "LT":
                    case "LU":
                    case "LV":
                    case "MT":
                    case "NL":
                    case "PL":
                    case "PT":
                    case "RO":
                    case "SE":
                    case "SI":
                    case "SK":
                        _taxIdType = "eu_vat";
                        break;
                    case "HK":
                        _taxIdType = "hk_br";
                        break;
                    case "IN":
                        _taxIdType = "in_gst";
                        break;
                    case "JP":
                        _taxIdType = "jp_cn";
                        break;
                    case "KR":
                        _taxIdType = "kr_brn";
                        break;
                    case "LI":
                        _taxIdType = "li_uid";
                        break;
                    case "MX":
                        _taxIdType = "mx_rfc";
                        break;
                    case "MY":
                        _taxIdType = "my_sst";
                        break;
                    case "NO":
                        _taxIdType = "no_vat";
                        break;
                    case "NZ":
                        _taxIdType = "nz_gst";
                        break;
                    case "RU":
                        _taxIdType = "ru_inn";
                        break;
                    case "SA":
                        _taxIdType = "sa_vat";
                        break;
                    case "SG":
                        _taxIdType = "sg_gst";
                        break;
                    case "TH":
                        _taxIdType = "th_vat";
                        break;
                    case "TW":
                        _taxIdType = "tw_vat";
                        break;
                    case "US":
                        _taxIdType = "us_ein";
                        break;
                    case "ZA":
                        _taxIdType = "za_vat";
                        break;
                    default:
                        _taxIdType = null;
                        break;
                }

                return _taxIdType;
            }
        }

        public bool HasTaxId
        {
            get => !string.IsNullOrWhiteSpace(TaxIdNumber) &&
                !string.IsNullOrWhiteSpace(TaxIdType);
        }
    }
}