Can I apply for a new 1-year retirement visa in Thailand if my current passport and visa are about to expire?

Get your passport renewal done in August or September, you will thank me later.

@Lucas *********

renew your passport around ( if it's same European Passport) October , then go immigration to transfer visa on new passport. Then 45 days or less , befoe via expires, renew your visa

You can request to renew your passport earlier to.. depends how you want to go about it ..

Yes, you can apply for an extension. But your extension will only be granted until the expiration date of your passport if it's less than 1-year, so your extension will end on April 6th, 2026. Once you renew your passport, and get your extension moved to your new passport, all of your yearly extensions from that point forward will be on April 6th. If you find that of benefit to you then you can do it that way, otherwise you should renew your passport before your apply for your next extension so you do not lose any time from it.