Form 8915b is not ready, but I am no longer getting the error that the form has not been finalized. Should I file or do I still need to wait for form 8915b to be ready?

[macuser_22]

You can file an extension that gives you until Oct 15 to file, but sill pay any tax due but April 17.

https://ttlc.intuit.com/questions/1900551-can-irs-extensions-be-e-filed

The "Relief for hurricane distributions" Requires forms 8915A/B that now has a 3/22/18 target date.

The IRS only released the paper/pdf for the new 2017 8915A and 8915B forms on 3/6/18 and the electronic schema specification are usually released by the IRS about 2 weeks after the pdf version. E-file providers must comply with the IRS schema rules to e-file.

After the IRS provides the electronic "schema" for the form, both the IRS and e-file providers must apply those new schemas to their software and conduct compatibility tests. Only after the IRS approves the test results can the forms be released in an update.