Hi,

In Odoo 11, the field taxes_id exists on account.invoice.line and sale.order.line as the Many2many tax field.

In Odoo 12, Odoo removed account.invoice and replaced the entire accounting flow with account.move and account.move.line.

Because of this rewrite, the old field taxes_id no longer exists in Odoo 13 on invoice lines.

The new equivalent field in Odoo 13 is tax_ids on the new model account.move.line.

So the correct replacement for Odoo 11 > Odoo 13 is: invoice_line.taxes_id > move_line.tax_ids.

On sales order lines, the field still exists as tax_id (singular) in Odoo 13, not taxes_id.

Therefore the mapping is: sale.order.line: taxes_id > tax_id; account.move.line: taxes_id > tax_ids.

If you migrated custom code, update all references from taxes_id to tax_id (for SO lines) or tax_ids (for invoice lines) depending on the model.

Hope it helps.