Module: EuVatRatesData

Defined in:
lib/eu_vat_rates_data.rb,
lib/eu_vat_rates_data/version.rb

Overview

VAT rates for 44 European countries (EU-27 + 17 non-EU).

EU rates sourced from the European Commission TEDB (Taxes in Europe Database), checked daily. Non-EU rates maintained manually.

Usage:

require "eu_vat_rates_data"

EuVatRatesData.get_rate("FI")
# => {"country"=>"Finland", "currency"=>"EUR", "eu_member"=>true,
#     "standard"=>25.5, "reduced"=>[10.0, 13.5], "super_reduced"=>nil, "parking"=>nil}

EuVatRatesData.get_standard_rate("DE")  # => 19.0
EuVatRatesData.eu_member?("NO")         # => false
EuVatRatesData.eu_member?("FR")         # => true
EuVatRatesData.data_version             # => "2026-03-18"
EuVatRatesData.flag("FI")              # => "🇫🇮"

Constant Summary collapse

DATA_FILE = 
File.expand_path("../data/eu-vat-rates-data.json", __dir__)
VERSION = 
"2026.4.25"

Class Method Summary collapse

Class Method Details

.all_rates ⇒ Hash{String => Hash}

Return all 44 country rate hashes keyed by ISO country code.

Returns:

  • (Hash{String => Hash}) 


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# File 'lib/eu_vat_rates_data.rb', line 51

def self.all_rates
  rates.dup
end

.data_version ⇒ String

Return the ISO 8601 date when EU data was last fetched from EC TEDB.

Returns:

  • (String) —

    e.g. “2026-03-18”



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# File 'lib/eu_vat_rates_data.rb', line 87

def self.data_version
  dataset["version"]
end

.dataset ⇒ Object 



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# File 'lib/eu_vat_rates_data.rb', line 26

def self.dataset
  @dataset ||= JSON.parse(File.read(DATA_FILE, encoding: "utf-8"))
end

.eu_member?(country_code) ⇒ Boolean

Return true if the country is an EU-27 member state. Returns false for non-EU countries (GB, NO, CH, etc.) and unknown codes.

Parameters:

  • country_code (String) —

    ISO 3166-1 alpha-2 code

Returns:

  • (Boolean) 


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# File 'lib/eu_vat_rates_data.rb', line 59

def self.eu_member?(country_code)
  rate = get_rate(country_code)
  rate ? rate["eu_member"] == true : false
end

.flag(country_code) ⇒ String

Return the flag emoji for a 2-letter ISO 3166-1 alpha-2 country code. Computed from regional indicator symbols — no lookup table needed. Returns an empty string if the input is not exactly 2 ASCII letters.

Examples:

EuVatRatesData.flag("FI")  # => "🇫🇮"
EuVatRatesData.flag("DE")  # => "🇩🇪"
EuVatRatesData.flag("GB")  # => "🇬🇧"

Parameters:

  • country_code (String) —

    ISO 3166-1 alpha-2 code (e.g. “FI”, “DE”)

Returns:

  • (String) —

    flag emoji (e.g. “🇫🇮”), or “” if invalid



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# File 'lib/eu_vat_rates_data.rb', line 102

def self.flag(country_code)
  code = country_code.upcase
  return "" unless code.length == 2 && code.match?(/\A[A-Z]{2}\z/)
  base = 0x1F1E6
  [base + code.ord - 65, base + code[-1].ord - 65].pack("U*")
end

.get_rate(country_code) ⇒ Hash?

Return the full rate hash for a country, or nil if not found.

Parameters:

  • country_code (String) —

    ISO 3166-1 alpha-2 code (e.g. “FI”, “DE”, “NO”)

Returns:

  • (Hash, nil) 


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# File 'lib/eu_vat_rates_data.rb', line 37

def self.get_rate(country_code)
  rates[country_code.upcase]
end

.get_standard_rate(country_code) ⇒ Float?

Return the standard VAT rate for a country, or nil if not found.

Parameters:

  • country_code (String) —

    ISO 3166-1 alpha-2 code

Returns:

  • (Float, nil) 


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# File 'lib/eu_vat_rates_data.rb', line 44

def self.get_standard_rate(country_code)
  rate = get_rate(country_code)
  rate&.fetch("standard")
end

.has_rate?(country_code) ⇒ Boolean

Return true if the country code is present in the dataset (all 44 countries). Use eu_member? to check EU membership specifically.

Parameters:

  • country_code (String) —

    ISO 3166-1 alpha-2 code

Returns:

  • (Boolean) 


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# File 'lib/eu_vat_rates_data.rb', line 68

def self.has_rate?(country_code)
  rates.key?(country_code.upcase)
end

.rates ⇒ Object 



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# File 'lib/eu_vat_rates_data.rb', line 30

def self.rates
  dataset["rates"]
end

.valid_format?(vat_id) ⇒ Boolean

Return true if vat_id matches the expected format for its country. Input must include the country code prefix (e.g. “ATU12345678”). Returns false when the country has no standardised format or the ID does not match. Note: Greece uses the “EL” prefix, not “GR”.

Parameters:

  • vat_id (String) —

    VAT number string including country code prefix

Returns:

  • (Boolean) 


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# File 'lib/eu_vat_rates_data.rb', line 78

def self.valid_format?(vat_id)
  code = vat_id[0, 2].upcase
  rate = get_rate(code)
  return false unless rate && rate["pattern"]
  !!(vat_id.upcase =~ /\A#{rate["pattern"]}\z/)
end