I don't use Sage, but just post as a normal Invoice with the money received into the bank including CIS, the VAT will go to the output and then transfer the CIS to CIS suffered in the BS, Invoice for the retention when it is due (most never pay it anyway) if you do want to account for it then just transfer it onto the BS as Retention Debtor until paid
Don't forget if Invoice is after 1st March VAT may come under the DRC
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Doug
These are only my opinions of how I see things and therefore should not be taken as advice