NAMA is in advanced discussions to dispose of €500m worth of properties.
The chief executive of the agency said that the business plan anticipates 25% of outstanding loans will be paid off by 2013.
CEO Brendan McDonagh said that NAMA was determined to meet that target.
Speaking at the Richard Cantillon School of Economics in Tralee, he said the agency was preparing to take enforcement proceedings against defaulting borrowers this year if necessary.
He said if borrowers were incapable or unwilling to repay loans 'we will move quickly to enforcement proceedings'.
The agency has completed tender assessments for solicitors and insolvency practitioners who will execute proceedings.
Mr McDonagh also said that by February of next year, NAMA will have reviewed, valued and bought €81 billion worth of problem loans.