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Good evening, if he has been working in employment less than 6 months then he would need to show income for last 12 months to meet the £18,600 per annum then you can apply as a dependent partner.
They would basis the financial requirement on you the British citizen not him sorry computer typo.
Ok under these circumstances he would need to work for at least 6 months before you apply on the partner basis to meet the financial requirement.
You can look at apply for human rights application for private and family life however if you do wait a couple of months it will be a stronger application with the partner visa.
It was a pleasure assisting you today.