The phrase "cent tax" refers to a tax that is charged or added to the cost or price of a product, service, or item, typically in increments of one cent. Full definition
There will also be a one off 50 per cent tax on banks on bonuses higher than # 25,000. (channel4.com)
No one wants to read comments complaining about a 3 cent tax on plastic bags — or how one party has made you energy bill $ 3 higher than you want. (nystateofpolitics.com)
His argument is that at both 0 per cent and 100 per cent tax rates, revenue would be zero. (nextleft.org)