Understanding Liquidation Thresholds and LTV in DeFi Lending

If you borrow against crypto, one number decides whether you keep your collateral: the loan-to-value ratio, written LTV.

What LTV means

LTV is your debt divided by the current market value of your collateral, shown as a percentage.

LTV = debt ÷ collateral value × 100

Deposit $10,000 of Bitcoin and borrow $3,000 of stablecoins, and your LTV is 30%. If Bitcoin then falls 40%, your collateral is worth $6,000 while the debt is unchanged at $3,000 — your LTV has jumped to 50%. The debt never shrinks on its own. Only the collateral moves.

What the liquidation threshold is

The liquidation threshold is the LTV at which the protocol stops waiting and sells your collateral to repay the loan. Cross it and the position closes automatically.

Thresholds vary by asset and by protocol. Stable, deep-liquidity collateral like Bitcoin or Ethereum tends to be allowed a higher threshold than a thin, volatile altcoin, because the protocol can sell it without crashing the price.

Why a lower personal limit beats the protocol's limit

A protocol might allow you to run up to 75% LTV. That is the level at which you are liquidated — it is not a target. Setting your own ceiling well below it is what buys you time.

Consider a conservative personal line of 65%:

• At 65% you get a warning while the position is still fully recoverable.
• You have room to add collateral or repay part of the debt.
• A sudden overnight 10% drop does not wipe you out before you wake up.

The gap between your personal line and the protocol's line is your survival margin. Wider is better.

How far can prices fall before you are liquidated?

Useful arithmetic. Your collateral can fall by roughly:

1 − (current LTV ÷ liquidation threshold)

At 30% LTV with a 75% threshold, your collateral can drop about 60% before liquidation. At 60% LTV with the same threshold, it can only drop 20%. Crypto routinely drops 20% in a week. That is why the second position is reckless and the first is not.

Liquidation penalties

Being liquidated is not a clean exit. Most protocols charge a penalty — often 5% to 15% of the liquidated amount — paid to whoever performs the liquidation. You lose the collateral *and* a slice on top, at a price you did not choose.

Practical monitoring

• Track your LTV live, not the coin price. Price is an input; LTV is the answer.
• Set an alert well before the threshold so you have hours, not minutes.
• Remember that adding collateral and repaying debt both lower LTV. Either action works.
• Watch every position separately. Two loans on two platforms have two independent thresholds.

Key takeaway

Liquidation is not bad luck. It is arithmetic that was visible the whole time. Keep LTV low, know exactly how far prices can fall before trouble, and give yourself a warning line far above the protocol's.