To structure this debate, these are the titles during your 4 first years post-mba at BCG:
Year 1-2: Consultant, USD 140K package
Year 3-4: Project Leader, no idea on exact number
Year 5-...: Principal, than partner after at least 3, mostly 5 years.
Note: A career isn't 100% predefined, but the time spans given are good guidelines imho.
So, after 4 years, you are either a 2nd year PL or a 1st year principal.
Fact: BCG raises your salary by 5% every 6 months. The 5% is confirmed for the lower ranks at least - let's assume the exact percentage stays like this throughout the ranks.
Fact: Big raise every promotion.
Estimate: 25% raise consultant => PL and PL=> Principal (This 25% includes the 5% 'standard' raise.)
This yields the following guesstimate for your BCG package 4 years out of your MBA:
(Every line is 6 months of time.)
Package Raise in %
234516,7371 25 <= 2nd year PL
293145,9214 5 <= First year principal
There you have it, my best guess is USD 235-295K.
Note: Bonus becomes more significant as well as variable as you move up. Guarantueed part of package will rise slower, expected bonus quicker over time.
Hope it helps.
Reflection: In reality it might be a bit more lucrative, since the principal-partner pay gap with my numbers.