That is not how marginal tax rates work. Each income band is taxed at the rate for that band. It’s why it’s called “marginal” - because the rate change happens at the margin between brackets.
You are taxed 0% on your first £12571. You are taxed 20% on your next £37669, or, £7359.80 on £50270 of income. If you then earned one more pound, or £50271, you would owe £0.40 (40%) on that one additional pound only, for a total of £7361.20. There is no income stage where earning more money has you taking home less.
That is not how marginal tax rates work. Each income band is taxed at the rate for that band. It’s why it’s called “marginal” - because the rate change happens at the margin between brackets.
You are taxed 0% on your first £12571. You are taxed 20% on your next £37669, or, £7359.80 on £50270 of income. If you then earned one more pound, or £50271, you would owe £0.40 (40%) on that one additional pound only, for a total of £7361.20. There is no income stage where earning more money has you taking home less.