Change of circumstances
There are some changes in your circumstances which you must report, or you could be overpaid and even have to pay a penalty. For example, if a child is no longer living with you or leaves school when they are over 16, you must report it as you would be overpaid Child Tax Credit. It is important to report changes like this as soon as possible, and within one month, to avoid problems. Another change which you must report is if you split up with a partner or start living with someone as a partner – in this case you will also need to make a new claim.
There are other changes which could increase the amount of tax credits you get. For example, if you have a new baby, you could get more Child Tax Credit. You should report these changes within one month to make sure you get as much extra money as possible (going back to the date of the change). If you report these changes after more than one month, any increase in your payments can normally only be backdated by one month.
Finally there are changes in income. You don’t always have to tell the Revenue about these, but it is a good idea to report most changes if you are not sure.
There is more information on the GOV.UK website about which changes you must report.
Every time you contact the Revenue, it is a good idea to make a note of the date and time of your call, and what you told them, in case there are any problems later.