A new government guide sets out the tax incentives for corporate giving.
A Guide to Giving for Business, published last week, explains how the private sector can contribute money, shares and equipment, and work with charities through employee volunteering or secondments.
Belinda Pratten, head of policy at the NCVO, welcomed the document but said it was important for businesses to remember the other benefits of working with charities.
"They are not only eligible for tax benefits but can also increase their brand value and access the different skills and knowledge offered by the voluntary sector," she said.
Mike Kelly, head of corporate social responsibility at professional services firm KPMG, which was consulted for the guide, said it would be "as useful to the third sector as to business".