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A hiring manager has just replied to an application I sent by asking me to clarify my desired and current salary. My issue is with the second part - at present I don't have a steady salary. I am currently working as a freelancer (with an hourly rate) and I also have a part-time job as an in-house developer elsewhere. The in-house job is a zero-hours contract - my hours are very variable month to month and the rate is significantly lower than my freelance rate.
How do I communicate my 'current salary' to the hiring manager? I can't calculate my expected yearly earnings as my hours are too variable and I've only been in this situation for a few months so I'm not sure I can extrapolate much from that either.