If you have claimed a relevant disability benefit that will give you entitlement to WTC (including the disability element) you need to make your claim for WTC within 31 days of the decision on your disability benefit.If you make the claim within 31 days, your WTC will be backdated to the start date of your disability benefit (as long as you met the other qualifying conditions for WTC during that period) or, if later, the date you started to meet the other qualifying conditions for WTC.If you met the rules for the new elements before you told HMRC about the change, they can backdate the change to your award up to 1 month, but you will need to ask for this.Back to the top Some claims (and changes of circumstances) can be backdated longer than 31 days.
In certain circumstances, it may be possible to award benefit / reduction from an earlier date. The maximum amount of time that your claim can be backdated is different for Housing Benefit and Council Tax Reduction claims.
If you have had to wait to hear about getting a disability benefit paid, you might want to have your tax credits backdated to the date you claimed it.
Some people may only qualify for WTC if they meet the criteria for the disability element of WTC.
If she does not make the claim within those 31 days, she can still claim WTC but will only receive 31 days' backdating.
If you now qualify for extra elements to be included because you (or someone in your family) start getting a qualifying benefit, you should contact HMRC straight away so they can be added to your claim.