`TaxCalculator`

Contracts/src/contracts/TaxCalculator.sol
Interface: Contracts/src/interfaces/ITaxCalculator.sol

Pure tax-curve resolver consumed by Listings to size up-front Harberger tax for liquid + dutch listings. The default calculator is shared across all collections; per-collection overrides can be installed via Listings.setCollectionTaxCalculator(_collection, _taxCalculator) for collections that need a different curve.

Public surface

interface ITaxCalculator {
  function calculateTax(
    address _collection,
    uint _floorMultiple,
    uint _duration
  ) external view returns (uint);
}

Param	Meaning
`_collection`	ERC-721 contract — included so the calculator can branch per-collection if it wants to
`_floorMultiple`	2dp price (`100 = 1.00x`)
`_duration`	Listing duration in seconds

Returns the tax in nativeToken units required to register the listing.

Implementation notes

The default calculator is parameter-light (floorMultiple ^ k * duration-style) and doesn’t read storage. Overrides are free to be heavier — gas cost surfaces directly in Listings.createListings / modifyListings receipts.
Listings always queries via Listings.taxCalculator(_collection) rather than calling the calculator directly; that read applies the override-or-default fallback.

Inherited surface

None — TaxCalculator is a stateless view-only contract.

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