Hi i want to use a default vat code for cash transactions as i have to input it on all sales

Hello Dobys, 

Welcome to the Community page, 

If you click on accounting on the main left hand navigation bar> then select chart of accounts> find that cash account> click on the little drop down arrow under action on the right hand side> select edit> a box will then pop up for you to then enter in the default VAT code you want> save and close so then every time you use that account it will automatically put that default VAT code on for you going forward.