Traditional 401k to Roth IRA Rollover

I rolled over a traditional 401k (pre-tax) from a former employer to a Roth IRA (post-tax). This was done as a "direct rollover" (Charles Schwab to Fidelity). As I understand it, I will need to pay income taxes on the rolled over amount because it’s being moved from a pre-tax account to a post-tax account. A 1099-R form was issued to me from the payer. When I file my taxes with TurboTax online, enter the 1099-R form, and answer all the relevant questions, I don't see any additional taxes being withheld. I suspect it has something to do with Box 2a being $0.00. I am almost positive that the 401k funds are all pre-tax dollars, and thus taxable when being rolled over to a Roth IRA. Could the 1099-R form be incorrect?

 

1099-R Form Details:

  • Box 1 (Gross distribution): ~$25k
  • Box 2a (Taxable amount): $0.00
  • Box 2b:
    • Taxable amount not determined - UNCHECKED
    • Total distribution - UNCHECKED
  • Box 7:
    • Distribution code(s): G
    • IRA/SEP/SIMPLE - UNCHECKED