What alternatives exist for proving an income of 40,000 baht per month for a Non-O marriage visa in Thailand instead of depositing 400,000 baht in a bank?

To prove the required income for a NON-O marriage visa, you can use a work permit to validate your income if you're employed in Thailand. Some immigration offices may accept income from abroad, but this typically requires an affidavit letter from your embassy. However, many embassies do not provide such services, making the 400,000 baht in a Thai bank account the more reliable option. If your embassy won't issue an affidavit, you will likely need to comply with the bank deposit method initially, then transfer 40,000 baht monthly for subsequent extensions.