How to account for usage by renter

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Hello,

I am setting up Sage for the first time and have a question about an invoice I send to a tenant.

We are a charity supporting a local building, which is split into two parts, the main part of the building is let to a tenant, the rest of the building is available to hire for anyone to hire out (sort of a village hall).  It is not possible (financially it's out of the question) for the tenant to be invoiced directly for the services they use.

The charity receives  four invoices a month - gas, electricity, water and refuse.  For the first three the tenant is invoiced on a pro-rata basis, the refuse charge is 90% of the total invoice, this may change if the  rental of the village hall area increases.  

The trust pays the invoices received in full through Direct debit.  Once a month we invoice the tenant for their proportion of the usage.  Do I record the invoice payment as income or expenditure? Last month the cafe proportion of the total invoices was 94.5%.

Thank you

Sandie