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The "Kosher tax" (or "Jewish tax") is the idea that food companies and unwitting consumers are forced to pay money to support Judaism or Zionist causes and Israel through the costs of kosher certification. The claim is a conspiracy theory, antisemitic canard, or urban legend.
Common refutations include that 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 and that extra business generated by the voluntary certification process more than makes up for the cost of supervision and so the certification does not necessarily increase the price of products and may, in fact, result in per item cost savings.