That does not seem to account for all their revenue, it does not say what percentage of all revenue comes from tax money.
The Guardian US expects to hit $44 million in voluntary reader donations in the U.S. and Canada this year, up 33 percent over last year [..].
These contributions account for more than 60 percent of the American operation’s total revenue, which last year exceeded costs by $16 million
(the rest of its revenue comes from advertising and philanthropic support from foundations).
By my reckoning "more than 60 percent of the American operation’s total revenue" + "the rest of its revenue comes from" adds up to 100 percent.Can you expand on what it is that you feel is not accounted for?
… Wait, what makes you think the Guardian is government funded? Which government?