--- sorry i am probably being a little dense here --- but does this actually mean that 50% tax is actually paid by the Trustees before being paid out to other beneficiaries ? or there is no tax paid if the seetlor is a non-tax payer?
1. The trustees pay out income tax at the 50% rate on the trust income.
2. The settlor is assessed at his marginal rate say 40% on the trust income. He is entitled to offset the 50% paid by trustees. He then reclaims the 10% from HMRC but has then to hand it over to the trustees (thus only 40% tax has been paid).
3. If settlor is a nil taxpayer then he reclaims the whole of the 50% tax paid by trustees from HMRC and then hands it over to the trustees; in effect no income tax is paid on the trust income.
4. If trustees pay out say £150 cash to a beneficiary, the beneficiary is not liable to income tax thereon (as the settlor was liable even if at 0%).