Nice, invented business name which blends in the words "certify" and "tax".
The name "Certaxa" has seven characters and three syllables. Successful brands using three syllable names include McDonald's, Sainsbury's and KFC.
This domain was first registered in January 2018. Older domains have an advantage when ranking in search engines.
Certaxa.com is a .com domain. Dot com domains are the most valuable top-level-domain in the world, famously used by websites like youtube.com. Once secured, a .com all but guarantees no-one else can outrank you for your own name in the long run.