Hi Mustapha
I've never used it but, the main issue here is that the WHT account you have created is in the P&L account and so would indicate that the tax withheld is lost to you, whereas most tax withheld can be offset against your corporation tax liability or refunded to you.
In such a case, when first recorded, the tax is debited to a current asset account, indicating that the tax is due back to you and then when it's offset against the CT liability you can do a journal debiting the CT liability account and crediting the WHT account. The alternative is to stipulate the CT liability account in the last box above in Tommy's screenshot.
It's not clear from Tommy's posts but, you need to set up a revenue account to record all the sales with WHT. In other words, if a sale will be subject to WHT you put it to the new Revenue account and, when the invoice is created, X% of the sale get's debited to the new WHT account or the CT liability account., whatever you stipulated in the last box above.
If you don't want to record any WHT when the invoice is created, because you won't know whether tax is withheld until the cash arrives, then you are probably best not to use CB's WHT feature. Rather, set up a dummy bank account called WHT and create a money in entry to it for the tax and allocate that to part pay the invoice. This will leave you with a balance on the dummy bank account representing what you are owed by HMRC. So, when you come to pay off your CT liability, you could use this balance to part pay it.
Tommy - I can't see a guide to any of this?