Money coming into my account

[Josh167]

Hello, 

So alongside my job i work saturdays to have a little more income, this is just sent to me through paypal, 

should i be doing tax on this, its roughly a £100 a week, 

ive been reading some bits on aslong as its under $20000/£15000 and 200 transactions ?? but then read this is due to change. 

Im uk based will this even effect me ?

thank you