[GNC] How to deal with income and invoices (at the end of the year)?

[Jan Vlug]

I do work in December. I think the Income should be booked in December 
for taxes.
But, I cannot send the invoice in December yet (because of specific 
procedures with the customer).

1. When I set the post date of the Invoice after 31 December (when I 
really sent the invoice) the date of the Income and Accounts Receivable 
transactions will be booked in the new month (January). But I want the 
income to be in the actual month of the work (December).

2. When I set the post date of the invoice on 31 December (which does 
not corresponds with the real date when I sent the invoice), the Income 
and Accounts Receivable transactions will be booked in the month when 
the work was done (December), which from a tax perspective seems more 
correct to me.

I tend to go for option 2. But the invoice date in GnuCash is not 
correct in that approach.

How would you recommend to handle this situation?