Reverse Charge VAT... ugh.

As a building company we  are now liable to pay  the VAT  to HMRC on our supplier invoices. We often get these invoices about 4 - 6 weeks before payment from the customer, and we often use these invoices to actually bill the customer. if the time between the two coincides with a VAT return, we can have serious cash flow issues. Also we often have suppliers who ask for more money than we are due to pay them ( retentions and monthly valuations) so often the money is committed to the project, but it is not paid exactly the same as the invoice value. 

So i am not putting the supplier invoices into sage until i pay them. This means however that they are not appearing in the project costing prior to payment so making project analysis very difficult. 

Can you please include a way to put supplier invoices into project costs without committing them to the accounts.  There could then be a way to commit them to the ledgers in the same was as you do with stock allocation - 

I am aware that we can do this as a project charge, but then when we put them in as a supplier invoice there have to be credits etc on the project - this completely messes up all the reports, and takes lots of time... 

thanks