Self-employment Income Support Scheme: What is it? It’s a taxable grant which will be 80% of the average profits from the tax years (where applicable): · 2016/2017 · 2017/2018 · 2018/2019 The average: Total trading profit for the 3 tax years (where applicable) divided by 3 (where applicable), divided by 12 to calculate a monthly amount. […]