Single claim to a joint claim

Hello,

So as I'm pregnant and things are getting harder with my health and needing support, my partner and I are talking about him moving in with me. We are both on UC separately and he lives with his parents and I live with my child. Please don't judge as he is currently out of work due to a bad injury where he is having to have ops and physiotherapy, on waiting lists.

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My assessment period was 10th May - 9th June.

His assessment period is 20th May - 19th June.

My payment date is 16th June.

His payment date is 26th June.

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When is the best time for him to move in without being without money? We want to do this ASAP. We have a close family wedding, where I am a bridesmaid, to attend on the 20th July, and have the hotel to pay for on arrival, so if I made a joint claim at the end of his assessment period on 20th June and he moves in on that date, would the new joint payment still be paid on the 16th July?

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I am already repaying an advance loan from last year so that probably isn't an option.

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I wouldn't be bothered if it wasn't for the wedding. Everything's paid for by family but the hotel room and with it being across the country, I wouldn't be able to attend and my family would lose a lot of money.

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Thanks.