After the panic of thinking you don't have enough to cover your tax bill, because you had forgotten about that deduction.
Every. Fucking. Year.
One year I not only panicked but paid the full amount. Ooops.
@Brommers started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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After the panic of thinking you don't have enough to cover your tax bill, because you had forgotten about that deduction.
Every. Fucking. Year.