The Payments Council intends to phase out cheques by 2018, but the decision has been criticised by charities, who claim it would have an adverse effect on donations.
The Treasury Committee reopened its inquiry in April, after receiving more than 1,200 letters on the subject.
The IoF has stepped up its public affairs campaign to highlight the importance of cheques.
As part of this work, the IoF recently met with Liberal Democrat MP David Ward.
He has agreed to host a parliamentary event for the body during the autumn.
IoF director of marketing and comms Simon Morrison said: 'Cheques remain a crucial income stream for charities. Some receive up to 80 per cent of their funds through this method.
'In light of the Payments Council's plans to abolish the cheque, we are taking a co-ordinated approach including lobbying, media relations work and stakeholder engagement among the IoF's 300-plus organisational members.
'This is to influence decision makers, with a view to saving the cheque until a viable alternative is found.'
The body is lobbying the Payments Council directly by participating in its charity and voluntary sector liaison committee. It also presented evidence to the select committee.