Hello Simon-burles-bti, thanks for posting on the Community page, You can add a minus figure on the second line to deduct the total of the invoice, but you will get an error if you are putting a minus figure for the entire invoice or on the first entry line. 

Thanks Ashleigh, I was trying to do exactly that, add a deduction to the second line but there’s no option to do it.

(my client wants me to subtract a cost from my bill) I need to minus some €uros from my invoice in £ GBP! I can put an explanation in notes but not the subtraction in the figures column!

Any further tips would be gratefully received.

kind regards,

Simon

Thanks for getting back to us Simon.

Are you entering a minus symbol (-) in the amount field in front of the cost, and do you receive any error when entering or saving this?