From page 75 of the above report:-

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5.18. Earlier in this chapter we recommended that the income threshold to sponsor a spouse/partner be set within a range of £18,600 to £25,700. According to Figure 3.10, at the lower bound of this range, 45 per cent of applicants would not meet this level of income threshold, while

64 per cent would not be able to meet the upper bound of this range.....