I'm running a limited company and I've made a cock-up with my invoicing. I humbly ask for your advice. I'm sorry that my first post on this forum is of the form "I'm an idiot. Please help."... 
I have just realised that last month I put a timesheet in to the client for 22 days of effort when it should have been only for 20 days (as a result of forgetting about Easter). The client signed this timesheet off, not realising my error. Having got my timesheet signed I then invoiced my agency for 22 days of effort, which they promptly paid. I have also recently paid my VAT online for the quarter ending 30th April (based on the invoices I raised in Feb, Mar and this erroneous April one).
Now that I have noticed the error, my question is: how do I square this best with (1) the client and agency and (2) The Vat Man. Here's my current thinking:
(1) With regard to my agency and client, the easiest way seems to be to speak with them and see if I can simply not bill for 2 days worked in May i.e. if I work 20 days in May, I'll only invoice for 18. Does this sound reasonable? Explaining this cock-up to them without making me/my company look incompetent seems like the harder part.
(2) With regard to the VAT side of things, If I can get the client and agency to agree to (1) above, is this actually a problem? I believe I've read several times on this forum that it's what's in the invoice that counts for VAT, not what is actually paid or not paid? Is that right?
Thanks again for any advice you can offer.
TM

I have just realised that last month I put a timesheet in to the client for 22 days of effort when it should have been only for 20 days (as a result of forgetting about Easter). The client signed this timesheet off, not realising my error. Having got my timesheet signed I then invoiced my agency for 22 days of effort, which they promptly paid. I have also recently paid my VAT online for the quarter ending 30th April (based on the invoices I raised in Feb, Mar and this erroneous April one).
Now that I have noticed the error, my question is: how do I square this best with (1) the client and agency and (2) The Vat Man. Here's my current thinking:
(1) With regard to my agency and client, the easiest way seems to be to speak with them and see if I can simply not bill for 2 days worked in May i.e. if I work 20 days in May, I'll only invoice for 18. Does this sound reasonable? Explaining this cock-up to them without making me/my company look incompetent seems like the harder part.
(2) With regard to the VAT side of things, If I can get the client and agency to agree to (1) above, is this actually a problem? I believe I've read several times on this forum that it's what's in the invoice that counts for VAT, not what is actually paid or not paid? Is that right?
Thanks again for any advice you can offer.
TM

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