More than 100 MPs have come out in support of a move to push the Government to address the massive VAT burden on charities.
The MPs have all signed an Early Day Motion tabled by Liberal Democrat MP Bob Russell at the end of January, which asks the Government to "introduce measures to reduce or remove this crippling financial burden on charities", estimated at between £400 million and £1 billion.
It also urges the Government to compensate charities for the increase in national insurance contributions which come into force in April.
Fifty-four Labour MPs, 29 Liberal Democrats and 17 Conservatives have signed up.
A number of government ministers have also written to the Charity Finance Directors' Group (CFDG) to express their support for the campaign. Ministers are not allowed to sign Early Day Motions.
CFDG is urging the Chancellor to consider MPs' concerns as he prepares for the Budget in April.