@roscr in the US the pension plans often have a contributory portion either tax deferred or after tax monies. The after tax contribution is amortized over the life of the pension distribution/ beneficiary. Thus all distributions are broken into two parts --- portion that has already been taxed ( i.e. allocated portion of the pre-taxed contribution based on amortization schedule ) and portion that is now taxable consisting of the employer contribution, growth etc.. Thus total distribution is the total monies distributed ( for the tax year ) of which taxable portion is Total LESS allocated individual's contribution. Thus when you are recognizing a pension distribution from any source ( qualified pension schemes ), Turbo is asking to fill in the 1099-R information i.e. total amount distributed and the allocated taxable portion ( i.e. Total less allocated after tax contributory portion ).
Does this make sense ?
Is there more I can do for you ?
pk