Can I order RTB anytime? February 28, 2020 02:49 Updated Yes, you may order anytime through the Bureau of Treasury’s website. Related articles How do I avail RTBs? Retail Treasury Bonds Due 2028 (RTB 28) FAQs What will be my proof of ownership for RTB? Where do I get the interest payments of RTBs? How often? Retail Treasury Bonds Tranche 27 (RTB27)