MEV
MEV (maximum extractable value) is extra income that comes from choosing and ordering the transactions in a block, for example when traders race to profit from a price gap. On Solana it is paid as tips through Jito's auctions. A validator running Jito shares those tips with its stakers after taking its cut, called the MEV commission.
Why it matters to you
MEV tips are a second stream of rewards on top of regular staking rewards. Whether you get any depends on two things. First, the validator has to run Jito; if it doesn't, there are no MEV tips to share. Second, its MEV commission decides how much it keeps. At 10% you get 90% of your share of the tips; at 100% you get none.
This is why a single "commission" figure can mislead. A validator can have a low inflation commission and still keep most of the MEV. Check both numbers.
MEV tips change from one epoch (about 1–2 days) to the next, so treat them as variable, not as a fixed extra.
Where you see it on this site
The fees card on each validator page and the Fees column in the list show the MEV commission as the second number in "rewards / MEV", for example 0% / 5%. A dash in its place means the validator doesn't run Jito. That also costs it the MEV part of our Score, so the most it can reach is about 82.5 out of 100.
Questions
Only if your validator runs Jito. You then receive your share of the tips minus its MEV commission, on top of regular staking rewards. If the validator doesn't run Jito, or sets its MEV commission at 100%, you get no MEV rewards. Your regular staking rewards are paid either way.