When can i file my taxes for a refund advance

 One of the options you can select when you are ready to file is to get a refund advance loan,    You do not receive any money until your e-file has been accepted by the IRS—-and the IRS will not begin to accept e-files until January 29.

https://turbotax.intuit.com/refund-advance/

If you are eligible for the refund advance you can file your tax return at any time after you have received all the forms necessary to report your income on the tax return.

See this TurboTax support FAQ for the refund advance - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-refund/refund-advance/L52Mg0G5u_US_en_US?uid=lrxmn1au