* New provision for refunds to hit earnings by A$325 mln

* Total customer-remediation provisions stand at A$1.2 bln

* Board to review dividend policy – analysts expect cut to 90c

* Credit Suisse analysts say more refund charges to come (Adds dividend cut estimate, more provisions to come, former adviser sued by regulator)

By Paulina Duran

SYDNEY, April 18 (Reuters) – National Australia Bank Ltd , the country’s fourth-largest, on Thursday flagged an additional A$749 million ($537.18 million) in charges to refund thousands of wronged customers and said it would review its dividend policy.

Melbourne-based NAB said it has now put aside A$1.10 billion to compensate customers as it speeds up efforts to regain public trust after a damaging misconduct inquiry in the sector.