I entered my real estate taxes and it didnt reduce my taxes

[Mohan]

Real estate taxes are part of Itemized Deductions - Schedule A. If you elected to use Standard Deduction instead of Itemized Deduction, then the real estate taxes will not make a difference to the taxes.

Some itemized deductions - real estate taxes included - are limited for high income earners. From Pub 17 for 2016:
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You are subject to the limit on certain itemized deductions if your adjusted gross income (AGI)
is more than $311,300 if married filing jointly or qualifying widow(er), $285,350 if head of household, $259,400 if single, or $155,650 if married filing separately. Your AGI is the amount on Form 1040, line 38
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Check if your itemized deduction amount was limited due to your AGI.