If you are a former employee of Sainsbury’s and would like to get a copy of your P60, you will have to contact the HR department for that purpose. Since there is no option available to get your P60 online using Oursainsburys portal, try to reach out the support via their employee helpline. As you might know, an employer isn’t obligated to give you a copy of the P60, so in case the HR department refuses to issue the report, you will have another option to claim the P60 certificate from HMRC.