Ask HN: Computing and comparing salary

A recent discussion about $100K salaries was drawing a lot of attention. However, it isn't clear how should such sum ($100k) be counted and compared?

Do you take a company car into account?

Bonuses?

Yearly stock grants?

Employer deductions into pension?

Or is it just the base salary?

Because all of this can make a big difference. Consider someone with a base salary of $100K. A company car for which he pays nothing but taxes is about another $5K in yearly value. Bonuses of 20% is another $20K. Let's say another $10K yearly bonus grants, and without counting pensions we get to $135K. So is this considered a $100K salary or a $135K salary, or something in between?

P.S. Surely this also differs between countries.