Unfortunately, for Category A, if he is salaried (fixed annual salary), and he earned less than £1,550 before tax on ANY payslip from the last 6 months, then the visa will be refused.
The reason is because for salaried employment, they calculate whether or not you meet the requirement by taking the LOWEST payslip from the last 6 months and multiplying it by 12. So, if his lowest payslip was £1,525, they will calculate the salary that can be used for the visa as £1,525 x 12 = £18,300. As this is lower than £18,600, you will not qualify.
One alternative would be to apply for the visa under Category B, using the last 12 months of his income... if he can show TOTAL pre-tax earnings of £18,600 from the last 12 months AND he shows that he is guaranteed to earn at least £18,600 in the NEXT 12 months, then you might qualify
HOWEVER, overtime can only be used for previous income and not future income, so if his base salary is only £18,200, his income won't qualify for the visa anyway UNLESS his employer can guarantee in writing that he will also earn the overtime in the future, thereby bringing his future earnings up above £18,600 over the next 12 months.
So, in summary, for salaried employment:
Category A:
- his lowest payslip from the last 6 months MUST be at least £1,525 before tax
AND
- his employer must be able to guarantee in writing that the overtime will continue so that he will earn at least £18,600 (£1,550 per month) in the next 12 months as well
Category B:
- his total earnings from the last 12 months MUST be at least £18,600 before tax
AND
- his employer must be able to guarantee in writing that the overtime will continue so that he will earn at least £18,600 (£1,550 per month) in the next 12 months as well