A toilet leaking water from the tank down onto the floor is typically caused by deteriorated rubber tank-to-bowl gaskets, corroded metal mounting bolts, or a loose large flush valve locking nut on the underside of the tank. As rubber seals age and harden, they lose their ability to maintain a watertight compression seal against the porcelain tank openings, allowing water stored in the reservoir to seep out. Callout type="warning" title="Hygiene Warning": Shut off the water supply valve and drain the tank completely before replacing gaskets. Verification: Dry the underside of the tank and observe where droplets form during a refill cycle to confirm the exact source.
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