passthrough

• passthru (US), pass-through

Deverbal from pass through.

passthrough (countable and uncountable, plural passthroughs)

1. The act or process of passing through.
   1. as of a signal through a device or network.
   2. as of increased costs through a business entity to its customers through increased prices.

      The airlines called the fuel surcharge a passthrough, but did not rescind it until well after fuel prices had returned to previous levels.

2. A wall opening intended to allow something to be passed through it.
3. (taxation) A legal entity intended to not incur (income) taxation at the entity, but solely at the beneficiaries.

   Partnerships, limited-liability companies, and Subchapter S corporations are the main US passthroughs.

   Synonym: flowthrough