The NCVO has expressed disappointment after it gained no concessions from talks with music licensing authorities over the proposed removal of the charity exemption from licensing fees.
The sector umbrella body met representatives from Phonographic Performance Limited and the Performing Right Society on Monday to discuss plans to end the exemption for charities from fees to play recorded music.
The exemption enjoyed by charities is expected to end in April, costing the sector an estimated £20m.
Belinda Pratten, head of policy at the NCVO, said: "We put forward some sensible options, which included exempting the smallest organisations from any fee, but this was flatly refused by PPL.
"We are extremely disappointed at PPL's lack of flexibility and understanding. This could be a huge financial burden on some of the smallest organisations in the sector."
Pratten said the organisation would continue to put pressure on politicians from both major parties to try to gain concessions for the voluntary sector.
A PPL spokesman said: "Today's meeting, which the NCVO unfortunately left early, was attended by a number of representative organisations in the charity sector and steady progress was made."