This Practice Note covers the key methods of valuing defined benefit liabilities, including the scheme-specific funding basis, the solvency basis, the s 143 basis, the s 179 basis, the neutral (or best estimate) basis, the IAS19 basis and UK GAAP. This Practice Note also explains the difference between valuing past service benefits and future service benefits, as well as related funding concepts, eg share of fund, actuarial factors and funding risks.