When creating a buy, you may want to hold funds in the pool rather than send to IRD after payment date
The first step is to create your purchase for tax - instructions for doing so can be found here.
When creating the purchase, make sure you untick the 'Transfer funds to IRD when order is complete' box when making the 'buy' request.
Then, when the client pays for the order, the funds will remain in the pool until you are ready to transfer to meet a liability at Inland Revenue.
Why would you leave funds in the pool?
Funds would typically be left in the pool when purchases are being made before returns have been filed. When returns are filed, the assessment amount may change at IRD, so leaving funds in the pool ensures that only what is required is transferred to IRD.
If too much tax is purchased, funds can always be swapped forward to later tax dates as required.