Hi arrissing, apologies for missing your topic here on the Support Forum, the Taxable Amount column isn’t supported in the latest WP e-Commerce release, I’ll be overhauling this in the 3.1.9 Plugin update as WP e-Commerce has changed the way they manage per-Product taxes in 3.8.8.5.
Taxable Amount should accept the name of the Tax Band, previously you could set the integer value (e.g. 10.00 or 20.00).
