Hypothetical situation.
As a single working parent of one child, I can claim child tax credit, and the childcare element of working tax credit, but no further working tax credit. This adds up to c. £5K, which all goes on childcare expenses.
If I were to move in with a new partner who is a higher-earner tax payer, not the father of the child and therefore with no financial responsibility for it, would I lose the child tax credit?
Trying to understand how the system works.