What it comes down to is

= The main point is.

Or you can use the verb "boil" instead of "come". In this case, we say "what it comes down to is...".

A: Why did you quit the project? Can't you find enough members?
B: Actually, yes. However, what it comes down to is the lack of budget.

Refs

• All Clear 3, Helen Kalkstein Fragiadakis

idiom, 14-06-01 23:48, 14-06-01 23:48, Yosei