Dh and I earned a but more than expected this year. It's about £700 so I assumed we'd owe done tax credits back. We only get the family bit (not childcare or working as we earn above the thresholds). So I'm rather surprised to receive an additional £23 as a one off payment. If we told them a lower amount originally, how have they under paid us? Feels like a lottery draw each year and completely unpredictable add the calculator never comes out the same as the reality. Baffling.