Thanks Menka and rpsarangi,
According to my accountant, net profit is calculated as: income-(expences, class 2 NI+income tax + class 4 NI). But he agrees that for home office it could be income - expenses. he is gong to clarify it with HO.
According to policy guidance this is the part applicable for sole trader.
If the applicant is a contractor who does not operate either through his/her own company or as an employee, he/she may provide:
•an accountant’s letter confirming a breakdown of his/her gross and net
earnings for the period claimed; and
Only issue is it does not say how the net is calculated.
Other confusing thing is the this website:
Where the earnings are the profits of a business derived through self-employment or other business activities:
the earnings that will be assessed are the profits of the business before tax. Where the applicant only has a share of the business, the earnings that will be assessed are the profits of the business before tax to which the applicant is entitled
This is from Attributes for Tier 1 (Exceptional Talent) Migrants.
Opinion of more senior members with solid experience would be rally helpful to rest this for once and for all.
Many thanks.