I am looking for a way to simplify and make more convenient my maintaining the required documents and tax cert for my motorbike. Currently, I have both my compulsory insurance policy by Viriyah and tax certificates needing renewal next month, the insurance on the 19th and the tax on the 25th. I also carry a voluntary policy with Viriyah that I had to renew two months ago which is out of step with expiry of compulsory and tax. I am not sure how/why but Viriyah billed me for both voluntary and compulsory two months ago which I paid, they called and credited me the compulsory not due yet. But it seems theirhead office is capable of merging the billing for both. But if I were to try to achieve that, I would want to make both policies expire the same date as the tax certificate. The compulsory I have always purchased at Nong Hoi as I pay the tax so know you need to present the compulsory insurance receipt in order to pay the tax. I am about to depart on a motorbike trip this week and may well still be traveling when this is due, so can I attend to it before I go? Will Nong Hoi accept payments but date the new policy and tax certificate upon expiry of the old one or as of the date I make the transaction? Why do the compulsory policy and tax cert not expire together as they are linked?