The "required period" is the period over which the disability conditions must be met in order for an award to be made or for a change in circumstances to lead to a change of award. It does not apply if a claimant is terminally ill.
The meaning of "required period" is defined in regulations.
Regulations 12 and 13 of the main PIP regulations provide that a claimant meets the required period condition for the relevant PIP component where-
- if [the claimant] had been assessed at every time in the period of 3 months ending with the prescribed date, it is likely that the Secretary of State would have determined at that time that [the claimant] had [limited or severely limited] ability to carry out [daily living or mobility] activities; and
- if [the claimant] were to be assessed at every time in the period of 9 months beginning with the day after the prescribed date, it is likely that the Secretary of State would determine at that time that [the claimant] had [limited or severely limited] ability to carry out [daily living or mobility] activities.
NB - the full required period does not have to be met in specified cases relating to a previous claim, and the required period does not apply where the claimant has a terminal illness.
Source: Part 3 of the Social Security (Personal Independence Payment) Regulations 2013 (SI.No.377/2013), and Part 3 of SR.No.217/2016 in Northern Ireland.
NB - in Scotland, adult disability payment is replacing personal independence payment and the meaning of reliably is found in Part 4 of the Disability Assistance for Working Age People (Scotland) Regulations 2022 (SSI.No.54/2022).
See also Social Security Scotland's guidance Backwards and forwards tests for Adult Disability Payment.
Commentary: The definition of ‘prescribed date’, as referred to in regulations 12 and 13 above, is set out in regulation 14 but has been the subject of caselaw – in  UKUT 486 (AAC) Judge Bano finds that, in the case of a new claim, the prescribed date will generally be the date of claim (although it can be later than the date of claim if the three month qualifying period has not been met). However, where a current award is being superseded, the prescribed date can be any date during the period of the current award. | Add commentary or suggest an edit.
‘Prescribed date’ for the purposes of superseding an award can be any date during period of current award
-  UKUT 486 (AAC)
Only disabilities which led to DLA award can be deemed to automatically satisfy the three months retrospective condition under PIP transitional regulations
-  UKUT 311 (AAC)
- Relationship between the ‘required period’ and ‘required period condition’
-  UKUT 115 (AAC)
The required period is made of two periods - a retrospective one and prospective one / an advance claim can only succeed if the 50 per cent rule is met for the retrospective period
-  UKUT 541 (AAC)
Social support does not need to be given at time claimant engages with other people / Tribunal wrong to concentrate on PIP eligibility at date of decision rather than during required period of 12 months
-  UKUT 584 (AAC)