The wage 18.600£ for FLR Spouse visa UK

[Detta]

Hello everyone, i am on Leave To Enter visa now, and i am working at the moment and I am making that wage, i have made that wage for 6 months, and i got a letter from my employer saying that i have earned more 9500£ before tax, and i got payslips and bank statements proving that i earned it, if i change my job and if my wage go down to less than 18.600£ a year, will that effect my FLR visa decision, or do i need to keep that wage during all lengh of my visa, thank you!

[Casa]

You are required to show earnings of at least £9,300 for the 6 month period prior to submitting the FLR(M) application.