This tax is only used on purchases to monotributistas or exentos but it's not used on sales. We deactivate to avoid confusions and will be removed in next version. closes odoo/odoo#47554 X-original-commit: aaa066d43e6c697cb91714fdc65ee7a18e5a53e5 Signed-off-by: Josse Colpaert <jco@openerp.com>