The main proposal for simplification and cost reduction would be a single agency with just 'one form for all benefits and a single website'. Any change for the better can't come soon enough, let's hope it's not just more thinking the unthinkable and then not getting the chance to do it!
"[He] illustrates the complexity showing how marginal withdrawal rates can be as high as 95.5%. For example, a single woman who works 30 hours per week, for every extra pound that she earns she pays a further 20p in income tax, 11p in NICs, and loses 39p in Working Tax Credit, a total of 70p. The extra net income of 30p (after these deductions from the extra pound) reduces her Housing Benefit and Council Tax Benefit by 85% of 30p, or 25.5p. Her marginal deduction rate is therefore 95.5% (70% + 25.5%)."
H/T Conservative Home.