The "Kosher tax" (or "Jewish tax") is the idea that unwilling food companies and unwitting consumers are forced to pay money to support the Jewish religion or Zionist causes and Israel through the costs of kosher certification. This claim is generally considered a conspiracy theory, antisemitic canard, or urban legend and is mainly spread by antisemitic, white supremacist, and other extremist organizations.
Common refutations include: because consumers who prefer kosher foods include not only Jews, but also Muslims, Seventh-day Adventists, and others, food companies actively seek kosher certification to increase market share and profitability; the fees collected support the certifying organizations themselves; extra business generated by the voluntary certification process more than makes up for the cost of supervision, hence the certification does not necessarily increase the price of products, and may in fact result in per item cost savings.
The kosher tax conspiracy theory states that the kosher certification of products (typically food) is an extra tax collected from unwitting consumers for the benefit of Jewish organizations. It is mainly spread by Antisemitic, white supremacist, and other extremist organizations, and is considered a canard or urban legend. Similar claims are made that this "Kosher tax" (or "Jewish tax") is "extorted" from food companies wishing to avoid a boycott, and used to support Zionist causes or the state of Israel.