I have an abn number that i used last year proberbly made 2500 in 3months whats my deadline for doing my tax?

Australian Business Numbers (ABN) When you are filing the 1040 federal income tax return for the tax year 2009 the return and any taxes that were due were supposed to postmarked before midnight April 15 2010.

You can still file the tax return before October 15 2010.