I only have one price, i used to get about 75% cash from my domestic customers, i bet its down to under 25% since C19
Though i would often ( as i always had a fair bit of cash in the house ) if i was having work done ask for a " cash price " if it was cheaper then great, , it was not upto me to make the moral call if the person / company were declaring it, I have recently had a gas engineer move a gas pipe when i fitted a new hob, Ł100 was the price or Ł65 for cash, will he declare the 30 mins work ? ? ?