The Charity Commission has launched a campaign to reduce the number of Welsh charities that submit their annual accounts late.
According to commission figures for last year, 1,000 of the 9,000 charities in Wales were late in submitting their accounts to the regulator.
Charities that file their financial information late are marked by a red banner on the online register of charities.
As part of the push to ensure prompt compliance, the commission's Newport office will contact charities by phone to remind trustees to file on time and offering help if there are problems.
The campaign will also be publicised through umbrella body the WCVA.
Harry Iles, head of the Charity Commission Wales office, said: "Getting accounts on time has become even more important for charities as funds become harder to find. A red banner may be the deciding factor for someone who wants to support the charity, so we want all Welsh charities to stay out of the red."
Tessa White, grants manager for the WCVA, said: "We always look at the register of charities when allocating grants and we expect charities to be fully compliant."