This is a great idea. I think your future idea will be a one stop shop app for all the needs of a small business regarding managing receipts and tax return. If this is not the on the roadmap please can you take this as a suggestion?
Absolutely a winning feature ... ability to photo a receipt or invoice and attach to the payment is surely waking up in freelancer heaven :-)
This idea has just gone live. Click on a transaction to upload or take a picture of a receipt and attach it to a transaction.
@Tim Fouracre: This is excellent! Can we please get it to support PDF attachments as well as images?
This feature looks great, wish it was available a few months earlier as I could have put my company expenses in there. Excellent work!