stupidity tax 

Noun: The UK National Lottery.

"God! Is that the time? Got to get to the shop and pay my stupidity tax."
"You'd be better off putting it on the 2nd favourite of the first horse race of every Saturday; buying premium bonds or even sticking the pound coins in a biscuit tin under the bed."
"I know, I know but I've been playing these same numbers for years now and if they came up I'd kick myself."
"I logged on to this website that explained how Lotto is a big swindle controlled by Freemasons who are anti-gambling and the number ball machine is rigged to give certain numbers."
"AAAGH! You bastard! You've made me late now! You wait, I bet my bloody numbers come up."

stupidity tax by McCririck's unlucky Laundress October 2, 2005

Stupidity Tax 

The cost to fix an error that was easily avoidable, often costs such as parking of postage incurred when forgetting to make a purchase at a more convenient time or with sufficient foresight.

Example 1: I forgot to put the beer on the shop, so I'm gonna have to order it by itself and pay the stupidity tax.
Example 2: I forgot to get her present last week so now I'm gonna have to pay the stupidity tax to get it next day delivered.

Stupidity Tax by Ragaja October 12, 2018

Excess tax on stupidity 

noun - the lottery. Some consider it the tax on stupidity because the proceeds go to the state, and only the stupid pay it.

John: I got to buy my big lotto ticket!
Jack: Oh, you have to pay your excess tax on stupidity!

Excess tax on stupidity by Corn Flake December 6, 2006