How much you can get depends on your income, the number of children you have, and whether any of your children are disabled.
To get the maximum amount of child tax credit, you need to have annual income of £16,105 or less in the 2017-18.
So, if you and your child's parent have split up, the main carer will be the one who can receive child tax credits.
If you can't decide, the Tax Credit Office can decide for you.
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If you have children, you'll be entitled to the childcare element of working tax credit as well.
If you're a disabled worker you may qualify for the disability element working tax credit.
Tax credits are made up of a number of different 'elements' or payments.
You may be eligible for just the family element and child element or for a few different elements, depending on your family circumstances.
However, be careful not to overestimate the fall in your income, otherwise you may be overpaid tax credits which you'll have to pay back at the end of the year.