Approximately 72,000 Newfoundlanders and Labradorians made charitable contributions, down from 85,600 in 2008.
The rapid decline in giving means charities are increasingly strapped for resources.
Ontario recorded the largest decrease in the percentage of household income donated over the decade.
In this year's Generosity Index, American states dominate the top of the rankings.
From 2004 to 2014, the percentage of Ontario tax-filers donating to charity fell by 18.7 per cent.