It is US$1000 a month if from a pension (including social security) or an annuity, and US$2000 if from investments where the return is not guaranteed and may vary.
1) Many people with US$2000+ in investment income could buy a short-term annuity with a little of that capital and qualify under the US$1000 a month rule.
2) The BTB wants retirees and Belize needs US$, so the BTB is flexible.
3) As a practical matter, retirees are telling me that they only have to deposit US$12000 a year in a Belize bank, even if they qualified under the investment angle.
Belize books and publications by Lan Sluder:
Belize First Magazine (http://www.belizefirst.com
Fodor's Belize & Guatemala Guide
Belize First Guide to Mainland Belize
Adapter Kit: Belize (the first and only comprehensive guide to living, retiring, working and investing in Belize -- a best-seller on Amazon.com)
UpClose Central America
San Pedro Cool (coming soon)