What amount of an IRA is tax deductable?

[jamiesanin]

If I open up an IRA and deposit money into it, is that entire deposited amount tax deductable?

[Hal_Al]

Simple answer: yes.

There are limits on how much you can contribute (deposit) and limits on deductability based on your income and whether you, or your spouse have a retirement plan at your job.  Details at https://www.irs.gov/retirement-plans/ira-deduction-limits