The odd one out is Customs.
Customs is a tax on goods imported into a country. The other three options are taxes on goods and services produced and sold within a country.
Customs duties are levied on goods imported into a country in order to protect domestic industries from foreign competition. They are also used to raise revenue for the government.
Service taxes are levied on services provided in a country. They are used to raise revenue for the government and to regulate the service sector.
Income taxes are levied on the income of individuals and businesses. They are used to raise revenue for the government and to redistribute income.
Sales taxes are levied on the sale of goods and services. They are used to raise revenue for the government and to regulate the economy.