Ash-Shaykh Abdul-Muhsin al-Abbaad, hafidaho-Allah, said:

… لا يجوز للتاجر أن يكذب على أصحاب الضرائب، ولكنه إذا استعمل التورية فلا شك أن هذا سائغ…

“It is not permissible for a tradesman to lie to the tax collectors. However, if he were to use tawriyah then with no doubt this is allowable.”

[Sharh Sunan Abu Dawud #346]

A Side Note: The definition of tawriyah and its details can be found here.