Double the Donation estimates that $2 to $3 billion is donated to charity through matching gift programs annually. But billions more go unclaimed every year. Is your not-for-profit doing everything it can to claim its share of corporate gifts? To encourage increased matching gifts, draw up a list of companies in your area that offer them and post it on your website. Also, all solicitations should encourage donors to check with their employers. You might further create your own matching pool with pledges from major donors and board members. Or check with foundations that match gifts to jump start a campaign