I am currently employed full-time in the UK as a graphic designer, I have a salary of £30K, I have also registered myself as a sole trader as I occasionally take on freelance work in my spare time (designing logos and artwork for print and web) I bring in no more than £3K a year from this extra work, this work is completed from a room in my house using my own equipment.
Currently 20% of the £3K income is deducted as tax, am I legally allowed to offset this against anything related to this work? For example Electricity bills or equipment?
Thanks you for your time.