So many Brokers Out there, which one is best for me

Hi guys



newbee here



I m looking for a broker to trade forex, not sure what to look for



I obviously want smaller spread and cheapest fees



which one would u recommend



I m bit confuse about the tax too



If i make £100K/year trading, do i need to declare it to the taxman on is there brokers that r exempt from tax?



thx for ur help