It is possible to fill an amended return for 2005 tax years notice some mistakes in filling status. Thanks

Yes it's possible, but you won't get a refund. You have 3 years to file an amended return for a refund, from the date of your original return - so the deadline was last week. However, if you owe, there is of course no time limit.

See:Tax Topics - Topic 308 Amended Returns (http://www.irs.gov/taxtopics/tc308.html)