Is proof of income required for a soft power visa in Thailand?

A well-structured budget is the foundation of financial independence. By tracking your expenses and prioritizing savings, you can identify areas to cut back and redirect those funds towards investments that will help you reach your Future Savers: Smart Strategies For Post-career phase & Commerce goals sooner.

Didn't ask, no requirement

sometime they just ask for supporting document that you have plan to support your self in thailand.

If you have evidence that you have income from stock dividend, pension or just rich parents you should be prepared to submit those document when asked.

if you do not have such evidence you should have some plan to tell embassy how to support your self for 5 years.

This is not formal requirement but if the embassy just curious and you do not have supporting evidence your visa will be rejected

There is no income requirement

Soft power, not required