Everyone with Guanajuato license plates on any type of vehicle must pay the refrendo, or Mexican road tax, by March 31st, whether you receive a notice or not. Here’s how to pay online, in a series of screen shots. Don’t blow this off! You’ll be fined, and that’s no fun.
Home page for the government site where you can pay your road tax (“refrendo”) online. 
Just say yes. 
Click to start the process. 
Step 1 
Step 2 
Add plate numbers for any additional vehicles. 
Movie’ right along… 
Step 3 
Step 4 
Step 5: Here’s where you actually make your payment. 
Success! Download your receipt and you’re done.
Need more help? Put your question in the comments. Don’t delay!
