Trading via an umbrella?
Traditional lenders will want to treat you as a permanent member of staff. They will use payslips to assess income, meaning holiday pay, bonuses, commissions, expenses and other non-standard income amounts will end up being ignored.
Running your own limited company?
Traditional lenders will require anywhere from 1 to 3 years of company accounts and, even then, the definition of “income” can vary wildly. Running your affairs tax-efficiently could mean a reduction in the level of borrowing available to you.
In both situations, your mortgage options could be severely restricted.