Call the Tax Credit Helpline straight away to correct a mistake on your claim form.
If you don’t call you may receive tax credits you’re not entitled to - this is called an overpayment.
You must repay any overpaid money and you may receive a penalty.
You could be fined up to £3,000 if you give wrong information carelessly or on purpose.
Don’t include personal or financial information like your National Insurance number or credit card details.