The Institute of Fundraising is launching a door-drop campaign to persuade individuals and companies to sign up to payroll giving.
A leaflet will be delivered to three million household and business addresses across the UK. It will explain what payroll giving is, how it benefits charities and how people and firms can get started.
Payroll giving allows employees to donate to any UK charity from their gross salaries. The Payroll Giving Grants programme, which is set to end in December, rewards organisations with fewer than 500 staff with a grant of up to £500 for signing up.
For the first six months of donations, the programme matches every donation pound for pound up to the first £10.
The programme is funded by the Active Communities Directorate.