Use of passports

[cross]

I am planning to move to Singapore shortly. My question concerns immigration and passports. I have 2 passports one as a US citizen, the other an EU passport as a citizen of England. Whilst living in Singapore I will have to continue to file US taxes. Therefore under my request for a work permit I was planning to declare my US citizenship. My question regards Singapore immigration policy. When in Singapore I will prefer to travel to certain countries under an EU passport. So whilst living in Singapore can I travel in and out on either passports or do I need to always arrive under the same passport?
Your help will be much appreciated.

[jpatokal]

Your EP will be stamped into one of your passports, so yes, you should always use that when moving in or out of the country. Otherwise, if spotted (which is actually fairly unlikely), you may have a little explaining to do... although AFAIK there's nothing actually illegal about re-entering the country with a different passport.

[yoongf]

Entering with a diff passport, especially on the passport that does not have the EP stamp.. runs a great risk of overstaying as entry with the other passport is treated as a short term social visit.

Overstaying in Sg.. is a big OB marker best to avoid.