If you reported your IRA contribution on your tax return, it should be deductible to the extent allowed by law. If the contribution was made before the deadline, and you can submit proof that you in fact made the contribution before the deadline, then the IRS should allow the contribution to count for 2016. If the contribution is considered late because the bank failed to send it on time, it should be considered an error on the bank's end, and in the worst-case scenario, you may be able to file an amended return, (Form 1040-X) to claim the contributions. However, as long as you have proof that you made the contributions on time, the bank should be responsible for any error in processing your contribution, and you should speak with a bank representative about how to correct the error. If problems with your tax return arise, it would be a good idea to speak with a CPA. Additionally, a CPA could advise you how to make the contributions for 2016 if it is at all possible.