The most recent BIS commissioned research (Walker and Zhu, 2013) shows that, on average, a male graduate will earn £168,000 more, and a female graduate £252,000 more, over their lifetime than someone without a degree but with 2 or more A-levels, net of income tax, VAT, National Insurance and student repayments (2012 prices).
Walker & Zhu (2013) also provide a breakdown of these figures across the graduate earnings distribution, as set out in Table 1.
Table 1: Graduate premiums from completion of a first degree for individuals by gender across earnings deciles
Individual Net Present Value
Graduate earnings deciles
Measurement unit £1,000
 As before, these estimates are net of tax and other costs, but also vary due to effect of income tax thresholds and the progressive nature of the student loan repayment model. For example you can see male graduates in the 1st and 2nd earnings deciles have higher graduate premiums than those between the 3rd and 8th earnings deciles as they are less likely to repay all of their student loan and will pay proportionately less income tax, National Insurance and VAT.