Mentally Impaired backdate

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DO the council have to backdate a mentally impaired discount ? Just claimed now but should have qualified for the last few years so can they backdate it ?

The criteria I have read do apply for the time I want to backdate it.

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Backdating of the SMI disregard (and any associated discount and exemption) can certainly occur. The council should look at awarding any reduction for the period they know that a person qualifies.

If the backdating is for more than 6 years then there may be further issues that have to be considered.