The ruling on selling at a price higher than the official price to evade taxes

The questioner : When governments burdened merchants with fines and taxes, merchants began using methods to escape them. For example, a merchant buys goods for twenty dinars, but writes ten dinars on the invoice. So when he sells them, he does the same thing: the same work, selling them for, say, twenty-five dinars, but writing only fifteen dinars on the invoice. Or he buys them at a high price in the black market, while the government forces him to sell them for less than that price. Is it permissible for merchants in this situation to sell at prices higher than those set by the government?

The Shaykh : What we see in this matter, and Allah knows best, is that it is permissible, on the condition that the matter is not discovered by the authorities, so that Muslims are then accused of cheating, treachery, and betrayal. With this condition, it is permissible; otherwise, it is not.