I am in the process of purchasing my first home. What is the deadline to purchase ? In order for me to claim on my 2016 taxes

[Texas Roger]

Since the deductible items are generally paid at closing, you must take ownership (close) on the home by Dec. 31. However, see bwa's answer below about whether it would help you on your tax return or not.

[bwa]

If you're asking about the first time homebuyer's credit, it hasn't existed for almost 10 years.  Other than that, interest, real estate taxes, points and MIP may be deductible but if you purchase it this year you may have no benefit.  Reason:  If you can't itemize now, adding only a small amount of interest, taxes, etc. for what is paid between now and the end of the year may not raise your deductions enough to itemize.