I am an Indian citizen, considered a resident in Singapore and tax payer thereof for the last 3 years (4 years inclusive of this years filing). I am relocating to the US on a work permit.
1. The financial year in SG and US is the same - Jan - Feb. I expect to file taxes here before leaving. So will I be taxed only for the time I actually stay in the US?
2. I believe US has a double taxation treaty with India, but I haven’t paid taxes in India for the income I earn in Singapore given I am a resident here. So how will this be taken into account while filing taxes
3. Worldwide taxation - I have no income from any other source apart from my employment but I retain a bank account in India to send money to - so yes do earn a little from the interest. Does that need to be declared while filing US Taxes?

Please advice.

Have a question, if we have spent substantial time on a B1 and thereby qualify the 183 day criterion as provided here - then, does that mean we qualify as a resident alien for that year

Publication 519 (2011), U.S. Tax Guide for Aliens

No, it means that, in the FIRST year, you meet the Substantial Presence Test, you qialify to file as a dual-status alien.

In order to file as a resident in the FIRST year, you must spend EVERY day of the year in the United States.

As a dual status alien are we taxed like this
.Alien status - income from time spent outside US not taxed
Resident alien status - income from time spent in the US taxed

At what rates?

Tax rates depend on level of income.

It starts at 10%, then 15%, then 25%, then 28%. There ARE higher rates, but that is for income in excess of $150K.

Oh OK. I understand.
So for the time spent in the US and income acrued thereof, say the amount totals to 10k.
One will be taxed at resident rates for 10k.
Please advice.