One thing to consider, not sure if it will be an issue
When I applied for my wife's visa, they wanted my existing earnings as well as my job offer letter - so she got in on the strength of my SA salary together with my job offer.
www.gov.uk
Category B: Less than 6 months with current employer or variable income – overseas sponsor returning to the UK
Where the applicant’s partner is returning with the applicant to the UK to work, they do not have to be in employment at the date of application to rely on Category B. Instead, the financial requirement must be met and evidenced in 2 parts in the following way.
First, the applicant’s partner must have a confirmed offer of salaried or non-salaried employment to return to in the UK (starting within 3 months of their return). This must have a gross annual starting salary (or in non-salaried employment a gross annual income from that employment, based on the rate or amount of pay and the standard or core hours to be worked provided by the employer in evidence) sufficient to meet the financial requirement, alone or in combination with any or all the sources at section (
Category C: non-employment income,
Category D: cash savings and Category E: pension).
Second, the couple returning to the UK must in addition have received in the 12 months prior to the date of application the level of income required to meet the financial requirement, based on:
- the gross amount of salaried or non-salaried employment income overseas of the applicant’s partner
- the gross amount of any specified non-employment income received by the applicant’s partner, the applicant or both jointly, provided they continue to own the relevant asset (for example, property, interest from shares) at the date of application
- the gross amount of any State (UK or foreign), occupational or private pension received by the applicant’s partner or the applicant
Under Category B, the assessment of the financial requirement will be based on both:
- the gross annual salary or income of the applicant’s partner’s confirmed offer of salaried or non-salaried employment in the UK. This source can be combined with Category C: non-employment income, Category D: cash savings and Category E: pension
- the actual amount of gross income received from the applicant’s partner’s salaried or non-salaried employment overseas in the 12 months prior to the date of application. This can be combined with the actual gross income the couple received from Category C: non-employment income and Category E: pension over the same 12-month period. Category D: cash savings cannot be used under (2)
Note that a shortfall in your wife's UK salary can be made up with cash savings according to a formula - but it seems that your past 12 months salary can't be topped up, and it's just her salary.