Charities who don't report face the chop

The charities watchdog has warned up to 6000 registered charities they'll be struck off if they don't meet reporting obligations for 2013 and 2014.

That means they'll lose their registration and their access to tax concessions.

Charities at risk are so-called double defaulters that have failed to meet their reporting obligations by submitting annual information statements for two consecutive years.

Australian Charities and Not-for-profits Commission commissioner Susan Pascoe said this followed the revocation of registration of 1300 double defaulters at the end of last month.

Ms Pascoe said the Commission had numerous attempts to contact the defaulters. She said the due date had been extended a number of times but not any more.

"If double defaulter charities do not file within 28 days, they will have their charity status revoked," she said in a statement.

"Many of these charities may no longer be operating but others may be deliberately non-complying."