I was aware of the IRGC graft.

I tried to check the amounts normalized for % of GDP.

Conservative estimates put them at half of the 2% GDP military spend. However, the IRGC's tentacles are also estimated to siphon off something like +50% of the GDP.[0]

Not all of that money's going to military hardware, but they have a substantial slush fund and use the Iranian resource base as a military piggy bank.

[0]https://fortune.com/2026/03/02/iran-islamic-revolutionary-gu...