How can you claim tax relief on an avc not deducted at source and medical expenses if you are a low income worker and with tax credits (single parent tax credit) already pay only a tiny amount of tax(good complaint). Surely you’d have to pay more tax than you can claim back? If this is true then super low income workers can’t avail of the tax advantages of avcs for example. Am I correct or not with this? I wouldn’t mind being wrong with this.