Narrative
No orchestral musician lives on one income line.
Advise an orchestral musician and the first thing to grasp is structural: the UK has roughly 1,000 permanent orchestral positions for several thousand qualified players competing to fill them. Almost nobody walks out of a conservatoire into a permanent seat.
What most working players build instead is a portfolio, a part-time orchestral contract with a regional orchestra, a list of ensembles who call them as a dep, a handful of contacts, and a growing teaching practice. Four income lines, each behaving differently, none sufficient on its own.
To read the accounts for a player like this, you have to read four at once. Start by building the year.