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Do you receive child tax credits or child benefit or both? Are you the individual with the higher income in your household?
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You need to register for self-assessment which you can do here. Submission of the tax return to HMRC will generate the tax bill for the year and will include the chuild benefit tax.
Based on the information provided and assuming you received child benefit for all three children for the whole of the 2016/17 tax year, you will have to repay £500.00 by 31 January 2018. Use the calculator here to work out the repayment.
I hope this helps but let me know if you have any further questions.
You would normally wait until 31 January 2018 to pay any tax owing for 2016/17 but if you want to pay early, wait until 48 hours after you have submitted the tax return online before you pay it.
When you have completed the data entry and are ready to submit the return, you can print a tax calculation before you submit the return so you can check that it all looks correct.