Charities should take care as they may need to be VAT registered. Often grants (which are not subject to VAT) are actually more like supplies of services (which are subject to VAT). Key things to consider are whether you have signed a Service Level Agreement, which contains restrictions on how the money is used and obligations that the charity must meet in order to continue to receive the money. If you breach the agreement, can you be sued?
If, on the other hand, the money is for a pre-existing activity or the charity has defined the activities it will deliver and how the money will be spent, then it is likely to be considered as a grant.
Not sure whether your income is actually making you liable to be VAT registered? Look at the Service Level Agreements or contracts and see if there is a clause that specifically mentions VAT.
About to sign a contract – remember to get it checked over first so that any clauses that won’t be beneficial for your charity can be reworded. Need help then please ask!