How much is an average 27-year-old's annual salary? How do I know if I am lagging behind?

Some people here seemed to answer for the sake of answering. I won't ask you to go refer to figures from recruitment companies, heck knows how they get their stats. I for one highly doubt those figures. I'm a more straightforward person and will say in my humble opinion if you're 27 and don't earn at least 4k per month, it is time you looked elsewhere, assuming you've had 4-5 years work experience under your belt.

One very good source is to have a look at what people are earning on the HWZ forum.

Depends on industries and also qualification. Working should be for more than the salary. If you are working only for salary, then it is time to go.

Just my 2 cents.