I have some donations that I made in 2015 which I didn't include in my 2015 filing. Can I include it in my 2016?

[Carl]

No. You'd have to file an amended 2015 return, and you can't do that with the online version of the program. Also, donations are itemized deductions. If the total of your itemized deductions does not exceed your standard deduction, it will make no difference in your tax liability either. In such a case, filing an amended return would be a waste of time.

For single, the standard deduction for 2015 was $6200
For Married Filing Joint, $12,400
For head of household, $9200