~ Monthly
    Expenses:Phone            10.00 GBP
    Expenses:Rent            550.00 GBP
    Assets

2012-02-28 * Phone expense
    Expenses:Phone            20.00 GBP
    Assets:Cash              -20.00 GBP

2012-02-29 * Rent expense
    Expenses:Rent            530.00 GBP
    Assets:Cash             -530.00 GBP

test budget --now 2012-02-29 --budget-format "%(justify(scrub(display_total), 0))\n"
(-550.00 GBP, 560.00 GBP)
(550.00 GBP, -560.00 GBP)
(20.00 GBP, -10.00 GBP)
(530.00 GBP, -550.00 GBP)
(0, 0)
end test