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You should have provided the IRS with the proof of your deductions when you received the notice from the IRS disallowing them.
If you are due refunds for 2011 through 2015, the IRS will keep the refunds to satisfy the amount that you owe whether your have a payment arrangement in place or not.
My best advice would be to file your 2011 through 2015 tax returns as soon as possible so you will know the exact amount that is owed, if any. If you still owe after filing 2011 through 2015, you can then request a payment plan.
When you send in your tax returns for 2011 through 2015, mail each tax year in a SEPARATE ENVELOPE. Do not mail all of them together. Also mail them by certified mail, return receipt requested and keep copies of the tax returns and the certified mail receipt for your records.
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