Cash Money. It is the legal tender of the country and you can buy whatever you want with it from anyone but the Candadian government:

Cash no longer accepted for paying taxes

Ottawa will no longer accept cash payments from people paying their taxes at service counters across the country.

The Canada Revenue Agency says it will still accept cash payments made through banks, however. Service counters will continue to accept cheque and debit payments.

Apparently it's too inconvenient....

The agency says it made the change because the amount of people who pay by cash is so small.

Of the seven per cent of taxpayers who make payments at the service counters, less than one per cent pay by cash, said Revenue Canada spokesperson Heather Cameron.

"It comes down to the fact … that there's so few people that are actually making their payments in cash now," said Cameron.

And here I was thinking that it was legal tender and if you tendered it on the government in payment, the government is to accept the same. A refusal to accept would certainly give rise to the question of whether penalties or interest would accrue.

(also at The London Fog)