"You would be best off recording this as a journal entry, as you can use the journal to move money around without it appearing on your tax reports. Create a liability account in Settings > Chart of Accounts and call it Director's Loan
Then go to Account Manager > Journal > Add Journal and enter the following transactions
Line 1 Account Directors Loan -- Credit Amount
Line 2 Account Bank -- Debit Amount
You do not need to select a property when doing this."