Retirement tax questions

Most responses indicate that 50% of the Teacher Retirement Pension income is not taxable (assuming AGI is less than $75k for a single person), however TT is only reducing income by  50%.  TT is NOT treating teacher's pensions correctly.  I have talked with reps from AARP who are doing taxes for the elderly in CT and they have confirmed that the reduction should be 100%.  The 50% reduction applied to last year's taxes.