Bit don't forget that at the time of renewing it has to have been in your account for 3 months.
Recommend you say at least 90 days, not 3 months. I had the baht in the bank for 85 days spanning 4 months and they denied it (this is even after I could show where the baht and been sitting in another account and transferred at the same bank for 6 months before that).
It is also my understanding that you can use a mix of pension funds and baht in the bank. For example showing a pension of 30,000 baht a month and having 500,000 baht in the bank (for 90 days) should work.
And dimple joe is correct, income is not part of the 90 day report criteria.