I never filed form 8606 for non deductible IRA contributions. Since I never deducted any of the contributions Can I enter the taxable amount as zero and file 8606?

[DavidD66]

Form 8606 does not have to be filed with a tax return.  It is a "signature" form.  You can complete a Form 8606 for each year you should have filed one and mail them in now.  Then you can properly complete your current Form 8606.

[mc_1127]

Does it matter that the prior year 8606 forms will be filed late? One of the forms relates to a contribution that was made for 2015 tax year which would be out of statute for amending returns.  

[JamesG1]

The 8606 should be filed to 'prove' the cost basis of your IRA.  Please see When and where to file on page 2 of the IRS instructions.

2015 form 8606 is here. If you were able to file the 2015 tax return, and the entry on form 8606 generated a refund, you would not be eligible for that refund.