If the type of IRA is taxable upon contribution (and not taxable upon distribution), then you would enter any/all of the total of the IRA/Keogh contributions you are referencing that you contributed that you've already been previously taxed on. This way, the system does not "double tax" you on these contributions. You would need prior years' returns for this information unless you have kept track of this elsewhere. Or, you could ask this of your financial institution. Whichever gets you the quickest AND most accurate result.