It would be handy if suppliers were given the possibility of having a default expense account set which would be automatically filled in when the supplier is selected for a purchase invoice. A default tax rate that would override the default tax rate of the default account, would also be handy.
Default expense accounts are set according to what you buy, not who you buy from. You can set a default account for both inventory and non-inventory items. Your suggestion would create conflicts within the program.
Really? Three layers of default? Tax codes also depend on what is being bought, not who you are buying from. (Sometimes, they depend on your identity, too, but that is addressed by not applying a tax code on the purchase invoice.) This is why you can define default tax codes for expense (and income) accounts.
I can’t argue about the possible conflicts it would create, but I can only tell you that other accounting software has these options and it can be handy. Of course it is what you buy that defines what tax rate needs to be applied. However, some things one buys always from the same supplier and some suppliers have only one product or service you ever would buy from them. Electricity comes to mind. Now I have to manually select every time an account and a vat rate and that takes time and bears a risk of mistakes.
Have you used the method suggested by @tut. You need to set it on Inventory.
I do for items I stock. But I don’t stock electricity 
I see what you mean now… Electricity could be a non-inventory items that needs to be set in the inventory?
Non inventory items are not Inventory Items - they are just a shortcut used to select account and tax rate automatically
Haven’t worked out how to make a non inventory item 
Thanks! I had just worked it out myself 