You can leave it blank. The driver's license number is
an added security measure the IRS and states have put in place for 2016.
Your
return can be filed and will process without your drivers license number.
Please
see FAQ below for more information.
In
an effort to help protect your identity and fight tax Fraud, the IRS and State
tax offices are now asking that tax filers provide their driver’s license or
state issued ID number. This step is not required in order to file your taxes,
for most states, but could help speed up the processing of your return and will
not affect your return’s submission. Omitting any of this information may delay
your return and refund processing.
States
such as Illinois and Alabama do require an ID to be provided in order to e-file
this year.
For
additional information, you can view the IRS information on the New Security Safeguards.
or to see if your state is participating, please contact your state revenue
agency.