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Yes if your partner does join then you would loose your disability premium as your partner would not be in receipt of this premium.
Good Afternoon, thank you for your enquiry and patience. I am sorry you did not feel previous expert did not answer your enquiry. I will revert to you shortly having reviewed what you have exchanged so far. I am a solicitor in England and Wales.
Your question is a valid question because usually you cannot have anyone aged 18 or over living with you, unless they are in one of these situations:
Your spouse is coming under the EEA regulations as opposed to the standard immigration route. They will therefore not be subject to immigration control and will not have a bar at having recourse to public funds so as a relative who will be above 18 years of age and living in the same home yes the premium will be lost as soon as the DWP are aware of his moving in.
I hope this answers your question. All the best.
If your spouse is only coming to visit temporarily and has no plans to remain past the 6 months limited time to be in the UK then there is no reason you would declare him as living with you because he is akin a visitor under the standard immigration rules and visitors do not affect British citizens rights to benefits in the UK. If he applies for the settle status whilst here and gets his pre-settled status (which if this question was not solely about benefits he would be best advised to do given Brexit and the complications to return after Dec 2020) then it will not be easy to argue that he was not ordinarily resident with you.
You are welcome, I am glad I could help. All the best.