....but, once completed....if you are due a refund for (say) 2013, do not choose to apply it to the next year's taxes due.
Since 2013, 2014, and 2015 will be processed manually (and that may take several months) there's no telling which will get processed first. So treat each refund or balance due for each as an entirely separate step.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
