As a workaround for now if you don't feel like deleting the invoice you can always add a line item to your invoice with a negative amount in the "flat fee" box.

Ensure the negative amount is equal to the invoice outstanding amount and it will offset the cost. The final cost will be $0

I'm guessing you track "per day" or something like that, right?

Here's a video preview showing _some_ of the expense tracking features.

http://www.screencast.com/users/subimage/folders/Jing/media/ab9d2373-a79b-44f2-82c3-7ec15cece2ef

We're still working on this, and will be adding vendors to the equation before this gets released to you all.

Thanks for your patience!

Nope, there's not an ability to do that right now.

Colin - you have the right idea. The discount percentage increases the earlier the invoice is paid. It's incentive for your clients to pay you earlier.

However, we're also implementing a "flat" discount, which might be what you're looking for.