30 hour childcare and salary

[xyz123]

Hi-we used 30 hour free childcare earlier in the year and we qualified as none of us earned more than £100,000. We stopped taking benefit in August as son started school. Since then I have changed my job and looking at current projections I will exceed 100,000 net adjusted income. I am looking to see how can I come under the income by increasing pension but does anyone know if qualification for free childcare is based in salary at time of getting benefit or is it based on whole tax year?

Thanks