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Try below formula, it adds one year:
=DATE(YEAR(A2)+1,MONTH(A2),DAY(A2))
Another option is to add 12 months:
=EDATE(A2,12)
Difference between the above formulas is that if date in A2 = 29th Feb 2016 (leap year), then the first formula returns 1st March 2017 while the second formula returns 28th Feb 2017.
Regards,
Amit Tandon