Was under a small bit of pressure to get some returns in and made the mistake of filing a form 11 for the wrong tax period. can i amend this online using ROS......
yes, FORM11 for 2011 will be rejected as tax year 2011 not finished yet. You can also contact Revenue if you wish to explain, its a simple mistake, and it will be sorted quickly.
I was assuming the OP meant they submitted a 2010 Form 11, and they meant "this year" as in the tax return that's due this October, as opposed to "last year" being the 2009 tax return, the one that was due last October...
Either way, it's a problem that can be fixed easily enough by phoning the tax office.