I did a rollover from my pension to a Roth IRA but forgot to take taxes out

Hi, 

I hope someone can help me here. I did a direct rollover from my defined pension plan but forgot to give the instruction to withhold taxes before going into a Roth IRA account. I got the 1099-R form with only the gross distribution amount and no taxable amount. How do I pay the taxes? Do I just say the taxable amount is also the same for the gross distribution? They are not going to give me a updated 1099-R with taxable amount on it since it was done last year in March. Any feedback is much appreciated.

 

Thanks,

 

Wade