Last year's tax return

[melbogia]

Hello, I have been using gnucash for a little over a year, and I have set
up taxes like so

Expenses:Taxes:Federal
Expenses:taxes:State

When I filed tax return for 2014, I owed some taxes so I filed them under
the above categories. So a sample ledger looks like so:

Expenses:Taxes:Federal (Expenses:Taxes:State looks similar)
3/30/15   pay check federal tax   200.00
4/15/15   2014 federal tax           500.00
4/30/15   pay check federal tax   200.00

The problem is that when I run an expense report, it includes the 2014
federal taxes, so the taxes I paid this year looks inflated. Technically I
did pay the 2014 taxes this year but those taxes were for last year. How
are folks handling this? Is there a better way? Should I just "back date"
the 2014 taxes to 12/31/14 so it doesn't show up in my expense report for
this year?

mel