A survey of institute members, conducted towards the end of the tsunami appeal, put the take-up of Gift Aid as a top concern for fundraisers.
Gift Aid on donations to charities in 2003/4 was worth £586m, but could have been up to £900m more if all donations had been Gift Aided.
Institute chief executive Lindsay Boswell said promoting Gift Aid was one way to offset any negative impact on donations to individual organisations as a result of the prodigious flow of money to tsunami-related appeals.
A spokeswoman for the institute said the campaign would target both charities and donors.
The Treasury published a corporate tax guide in January to promote tax-efficient giving by business, and for the past two years the Inland Revenue's self-assessment tax return has included an insert explaining the tax advantages of Gift Aid. Since the tsunami appeal, the Inland Revenue's website has posted guidance on giving tax-efficiently.
A Treasury spokesman said efforts by the Government and charities to encourage tax-efficient giving had already paid off, in that more than 60 per cent of donations made to the tsunami appeal made use of Gift Aid, a significant increase on the average for charity donations.