Turbotax is asking Rent Tax I.D. and Business Tax I.D. but we do not have either, trying to check the box to indicate it's not available but the system doesn't let me.

[htm_asano-yahoo-]

I cannot proceed to e-file state tax. Do I need to mail it?

[RobertB4444]

If you have not established a business to manage your rental property then the tax ID number that you would use for your rental would be your social security number.

However, some localities require you to obtain a tax ID number if you are a landlord and to provide it to your tenants for use for tax credits and the like.  If you are a landlord in one of those locales you may need to apply for a tax ID number.  And if you are a tenant in one of those locales then your landlord will provide you with their tax ID number.

@htm_asano-yahoo- 

[Carl]

What state? It matters. If I were to venture a wild guess, I would guess you're dealing with Hawaii state taxes, as landlords are required to be registered as such in that state.

[htm_asano-yahoo-]

You guessed it right! We live in Hawaii and have one rental property... 

[Carl]

You guessed it right! We live in Hawaii and have one rental property...

If that rental property is located in Hawaii or not, be aware that you are required to be registered with the HI state taxing authority, as you have to issue your tenants a tax certificate, as they get to deduct a portion of their rent payments to you, from their HI state taxable income.(If the property being rented is in Hawaii.)  Additionally, you as a landlord are required to pay the GET tax (General Excise Tax).
I would suggest you start reading at https://files.hawaii.gov/tax/legal/brochures/Res_RP_brochure-23.pdf and seek the services of a local tax pro to help you with reducing any fines and penalties I'm fully expecting to be imposed on you for not making quarterly GET payments.
I suggest a pro, because I left HI over 20 years ago, and I'm sure a few things on this front may have changed.