I am working on a project where I and the client agreed on a fixed amount project and some extra buffer amount for any extra work. And I suppose to get paid after the completion of the project.

I completed the project with a 1-day delay. The client was ok with that because it was submitted on weekend. I submitted an Invoice for the complete payment on Monday. I was busy with some other project so didn't bother about the payment.

On Wednesday (2 days after sending the invoice) the client told me to cancel the previous invoice and send one more Invoice with the extra buffer amount. In the old Invoice, the buffer amount was not added.

Now I am confused about how to cancel the old Invoice and send a new one? I submitted the Invoice through email.

  • I did some extra work. The buffer amount was very less only a 2K difference from the agreed amount. Jul 5, 2021 at 14:28

1 Answer 1


On the face of it, your problem is a simple one to solve. Depending on your method of invoicing, you either need to just send a corrected invoice with the new amount (if it was an informal or pro-forma invoice) or issue a credit note to the client (to the value of the old invoice) and raise a new invoice with the corrected amount and a new invoice number if they've already added your invoice to their billing system. If you're not sure, phone or email the client and they'll tell you if you need to raise an entirely new invoice with new number.

Given that the difference is only a few tens of dollars, I'd accede to whatever request they have and send them a corrected invoice. It may be that the client wants to reward you for a job well done, has the money already spent in his budget and can't be bothered to account for it or is under the mistaken impression that you're owed it contractually. Whatever the reason, it's probably better to just go with the flow, since the amounts are so small.

  • I was things I should use the same invoice details like invoice number, and description etc, And only change the date and add a small note that the previously raised Invoice is invalid. The main thing is can the client misuse the invoice and show as if he paid me 2 times? Jul 5, 2021 at 14:32
  • @RajendranNadar - No, he can't misuse the invoice like that. I was initially worried that he was going to pocket the difference between the agreed amount and the invoice amount but that can't be the case if he's paying you the buffer as well.
    – Valorum
    Jul 5, 2021 at 14:42
  • Hey sorry I should have mentioned the currency it is 2K INR = 30$ as a buffer amount. Jul 5, 2021 at 14:50
  • I have a call with the client he told me to drop an email as a reply in which I send the old invoice. And told me to mention that the prev Invoice is cancelled. Jul 5, 2021 at 14:55
  • 1
    Lol. $30 is very different from $2000!
    – Valorum
    Jul 5, 2021 at 15:06

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