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First of all - you need to prepare schedule A (from 1045) - that is how you calculate 2015 NOL.After 2015 NOL is determined - it must be carried back for two years unless you specifically elected not to carry back and only carry forward.
Form 1045 is used instead of amending 2013 and 2014 tax returns.
That would be more simple to prepare form 1045 with your 2015 tax return and claim refunds for prior two years.
If you are looking for some examples - please take a look into following publication
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