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Self Assessment UK - Goods and services for your own use
The problem with your profession is that it is hard to distinguish those activities as 'services rendered' or just a 'pastime hobby'. If you believe that both of those activities constitutes a 'service rendered in a professional capacity', then you should include it into the 'Goods and services for your own use' field. However, should you believe that those services rendered was not in a professional capacity and it was in a personal one (i.e. helping out), you need not include it in the field. In addition, should you feel that the pro-bono services rendered overlaps with your professional freelance work in any way, you might want to consider the service rendered to your dad and yourself as a 'professional service' and include it in Goods and services for your own use. Such examples include (but not limited to): It might be wise to call up the HMRC to clarify on your particular situation. But what I know is, this box was created to ensure that such services rendered should be considered a profit (i.e. an advantage, adds value) and not a loss (or no value).