All GI Bill education benefits
(including the Montgomery GI Bill - Selected Reserve), are not taxable and not reported on your tax return.
From the IRS Publication 970:
"Payments you receive for education, training, or subsistence under any law administered by the Department of Veterans Affairs (VA) are tax free. Do not include these payments as income on your federal tax return.
If you qualify for one or more of the education benefits discussed in chapters 2 through 13*, you may have to reduce the amount of education expenses qualifying for a specific benefit by part or all of your VA payments. This applies only to the part of your VA payments that is required to be used for education expenses.
