How to Borrow USDC Against ETH Without Selling It

Educational content only, not financial, investment, tax, or legal advice. DeFi and borrowing involve risk, including loss of capital. Income and appreciation are not guaranteed.

Isometric ETH collateral and USDC borrowing concept

Picture this: you bought ETH years ago, it’s up a lot, and now a real expense shows up. A tuition bill, a home project, a tax payment. Selling feels wrong, partly because you believe in the asset and partly because of the tax bill the sale would create. So you start wondering whether you can borrow dollars against it instead.

You can. In DeFi, you lock ETH into a lending protocol as collateral and borrow USDC, a dollar stablecoin, against it. You keep ownership of the ETH, you pay interest on the loan, and you get liquidated if ETH falls too far. This guide walks through each of those pieces, with numbers, so you know what you’re signing up for.

TL;DR

Borrowing USDC against ETH means depositing ETH as collateral and taking out a smaller amount of USDC. Most DeFi loans are overcollateralized, so you always borrow less than your deposit is worth.
Your loan-to-value (LTV) ratio and the protocol’s liquidation threshold decide how much you can borrow and how much price drop you can survive.
Rates are variable on most pooled lending markets and move with supply and demand, so the rate you see today isn’t the rate you’ll pay next month.
Liquidation is the main risk. A conservative LTV, a monitored health factor and a repayment plan matter more than squeezing out the biggest loan.
Check the tax side with a qualified US tax professional before you act. A loan and what you do with the cash can be treated differently.

How borrowing USDC against ETH works
How much USDC can you borrow?
What does an ETH-backed USDC loan cost?
What happens to your ETH while the loan is open
Liquidation: the risk that matters most
Can you earn daily income with the borrowed USDC?
Taxes and eligibility: what to check first
Where we fit in
FAQ
Sources

How borrowing USDC against ETH works

Think of it like a pawn shop that never closes and never asks your name. You hand over something valuable, you get cash, and when you pay the cash back plus interest, you get your item back. The difference is that a smart contract holds the collateral, not a person.

On a protocol like Aave, users supply assets and borrow against them, and interest rates, collateral checks and liquidations all run onchain. There’s no loan officer and no credit check. That also means nobody is judging whether you can afford the loan, so the safety margin is entirely about the collateral.

That’s why these loans are overcollateralized. Circle’s documentation explains that most DeFi loans require a deposit worth more than the loan, because the collateral is volatile and lenders have no credit scores or identity checks to lean on.

The basic sequence looks like this:

Move ETH into a wallet you control and connect it to the lending market.
Supply ETH as collateral.
Borrow USDC, up to the limit the protocol allows (and ideally well under it).
Use the USDC, then repay principal plus interest whenever you choose.
Withdraw your ETH once the debt is cleared.

If you want the step-by-step version on one specific protocol, we’ve written a practical guide to borrowing on Aave safely. For the broader picture of why people borrow instead of sell, see our walkthrough on borrowing against Ethereum.

How much USDC can you borrow?

Two numbers control this: LTV and the liquidation threshold. LTV is the loan divided by the collateral value. The liquidation threshold is the LTV at which your position can be liquidated. The gap between them is your cushion.

These parameters differ by protocol and change over time. Some real examples, each specific to its own product and date:

Market	ETH-related parameters	Date of the figures
ether.fi, Optimism market	55% product LTV, 75% collateral factor	August 2026
Aave V3, Ethereum Core (WETH)	80.5% max LTV, 83% liquidation threshold	Mid-2026 (changes proposed)
Fixed-term loan product	Fixed 50% LTV with one-time term fees	Current docs

An Aave governance proposal has sought to raise Ethereum Core WETH to 81% max LTV and an 84% liquidation threshold. Whether or not it has taken effect, it shows how these limits can change. Check the live app before borrowing.

Don’t read the highest number as a target. A maximum LTV of 80% means the protocol will let you borrow that much, not that you should. At the maximum, a modest dip in ETH can put you at the liquidation line.

A worked example with round numbers

Say you deposit 10 ETH and ETH is priced at $3,000, so your collateral is worth $30,000. These numbers are illustrative, not a forecast.

Borrowing $9,000 is a 30% LTV.
Borrowing $18,000 is a 60% LTV.
Borrowing $24,000 is an 80% LTV.

If the liquidation threshold were 83%, the $24,000 loan would be liquidated once your collateral dropped to about $28,900, a fall of roughly 4%. The $9,000 loan would hold until collateral fell to about $10,800, a drop of roughly 64%. The difference between those two outcomes is the whole game.

We go deeper on picking a safe number in our guide to sizing BTC and ETH income positions.

What does an ETH-backed USDC loan cost?

There are two broad pricing styles: variable and fixed.

Variable rates. On pooled markets, the rate moves with supply and demand. Jumper notes that rates accrue every block and there’s normally no fixed repayment schedule. The Bank Policy Institute describes how yield is set mechanically by pool utilization: as more of the pool is borrowed, rates climb, and past a certain kink point they rise faster to pull in lenders and push borrowers to repay.

Here’s how much that can swing. On-chain data for Compound V3’s USDC market on Ethereum showed a borrow rate of 3.98% on November 5, 2026, with values between 3.93% and 10.39% over the prior week. One rate tracker reported 5.28% for Aave V3 on Ethereum the same day. Those are snapshots, not promises.

Fixed-term pricing. Some products charge an upfront fee instead. One fixed-rate guide says an entry fee equals 8% of the total interest owed at maturity, and an early-exit fee may apply. That product may no longer be open to new loans, so treat it as an example of how upfront fees can be structured, not as a live offer. Another documents one-time term fees of 2.5% for 15 days, 5.0% for 30 days and 7.5% for 45 days, plus a protocol fee.

Its worked example is useful for seeing how fees stack. Deposit $1,000 of ETH, borrow $500 for 30 days, and the buyback cost comes to $525 after the 5% term fee of $25, with a separate 2.49% protocol fee of $12.45 taken from the USDC you receive. Notice the second-order effect: you receive a bit less than $500 but repay $525. Always compare the all-in cost, not just the headline rate.

Worked example of loan fees and net proceeds

On top of interest, remember gas fees for every transaction: supplying, borrowing, repaying and withdrawing.

What happens to your ETH while the loan is open

Your ETH is locked. On Aave, for example, collateral can’t be transferred or withdrawn until the borrow is repaid. Repayment is principal plus accrued interest, and once you repay fully, the collateral is released.

That has a practical implication. You can’t, say, sell that ETH quickly on a price spike while it backs a loan. You’d repay first. If you think you might want that flexibility, borrow less, or keep part of your ETH outside the loan.

Two habits help here. First, track the position, not just the price. Our guide to crypto portfolio tracking for DeFi borrowers covers what to watch. Second, think about your collateral management before you need it, such as how you’d top up collateral or repay part of the loan in a fast drop.

Liquidation: the risk that matters most

A position becomes liquidatable when its health factor falls below 1. The standard relationship is collateral value times liquidation threshold, divided by debt. Using our earlier example at an 83% threshold, $30,000 of collateral against $18,000 of debt gives a health factor of about 1.38. Against $24,000 it’s about 1.04, which is nervous territory.

When liquidation happens, a liquidator repays part of your debt and receives your collateral at a discount. Aave explains that this incentive keeps the system overcollateralized. For you, it means you lose ETH at a worse price than the market, and a liquidation penalty comes out of your collateral.

Academic research backs up how sensitive these systems are. A study of several major lending platforms found that liquidation designs can sell excessive discounted collateral at the borrower’s expense and that platforms are sensitive to ETH price drops. Its historical scenario, published in 2021, showed that a sudden 43% ETH decline could make up to $1.07 billion of MakerDAO’s collateral liquidatable at the time. That’s a study result, not a forecast, but it shows why a fast drop is the thing to plan for.

Other ways the loan can go wrong

Oracle problems. Lending protocols depend on price feeds. OWASP lists oracle manipulation, stale data and low-liquidity pricing among the risks to collateral valuation and liquidation. We cover this in more depth in our piece on DeFi oracle risk.
Smart contract risk. Code can have bugs, however well audited.
Stablecoin risk. USDC has mostly held its peg, but it briefly traded well below $1 in March 2023, and any stablecoin can depart from its peg. That affects what your debt is worth to you in practice.
Your own mistakes. Wrong network, wrong address, an approval you didn’t understand. These are easy to make and hard to undo.

A short risk routine

Borrow well under the maximum, and choose a health-factor buffer you could live with through a sharp, fast drop in ETH.
Set alerts on your health factor and ETH price.
Decide in advance what you’ll do at each trigger: add ETH, repay some USDC, or close out.
Keep some USDC or cash outside the loan to repay quickly.
Read our guide on how crypto loan liquidation works and how to avoid it, and know your exit strategy before you borrow.

Can you earn daily income with the borrowed USDC?

People often ask this next, and it’s where the risk goes up. Stablecoins sitting in a wallet don’t earn anything. StableRail explains that yield comes from an underlying activity, such as lending to collateralized borrowers or providing trading liquidity, and that the return compensates for risks like smart-contract failure, delayed withdrawals, depegging and loss of principal.

Translate that into your situation. You’d be paying a borrow rate on the loan, and you’d need whatever you deploy USDC into to out-earn that cost after fees, and to do so reliably, with additional risks stacked on the liquidation risk you already have. Some months the math may not work. We teach wallet security first, before any income strategy, and only then look at whether a strategy’s net result, after borrowing costs and fees, is worth the combined risks. If you’re thinking about putting borrowed funds into a pool, read our 15-minute pre-deposit check for liquidity pools first. For the bigger framework, see our framework for daily crypto income.

Nothing here is a promised return. Anyone who guarantees you a yield on borrowed money is selling something.

Taxes and eligibility: what to check first

The tax question is the reason many US holders look at borrowing in the first place, so it deserves care. The IRS says digital assets are treated as property, and general property tax rules apply. Selling or exchanging ETH can create a gain or loss. Taking a loan isn’t a sale by itself under that framework, but the details depend on the structure and on what happens next.

Three situations to raise with a CPA who knows crypto:

Liquidation. If your collateral is sold to repay the debt, that’s a disposal of ETH, and it can create a taxable gain.
Swapping assets. Converting ETH or other tokens along the way can be a taxable exchange.
Income from deploying the USDC. Rewards and fees you earn may be taxed as income when received. Our guide on US crypto income and gains at sale explains the mechanics, and accessing cash without selling BTC or ETH covers the capital-gains side.

Rules vary outside the US, and some products aren’t available in every state or country. Check eligibility on the protocol’s own front end and your local rules. Keep records of every transaction, including gas fees, from day one.

Where we fit in

We built OverseasDeFi for people who already hold BTC and ETH and want to understand this properly before they act. We provide education, tools and coaching. We don’t hold your funds or manage investments for you, and you make your own decisions.

Community and Accelerator offer different levels of support, combining portfolio tools, a portfolio-aware AI coach and live human guidance. The tools can help you look at holdings, debt and health factor together and think through adverse-price scenarios. They can’t prevent liquidation or make decisions for you. You can see both plans on our main site.

If you’re not sure yet, start with the free guides in our learning library. No pressure. Read a few, see whether our way of thinking about risk matches yours.

FAQ

Is borrowing USDC against ETH a taxable event?

The IRS treats digital assets as property, and a loan isn’t a sale on its face. But a liquidation, a swap or income earned from deploying the USDC can create tax. Talk to a CPA who handles crypto before borrowing.

What LTV should I use?

There’s no universal answer, and protocols set their own maximums. A lower LTV gives you a bigger cushion against price drops, so many borrowers stay far below the maximum. Pick the number you could live with if ETH fell sharply overnight.

Is the interest rate fixed?

On pooled markets, usually not. Rates move with supply and demand and accrue every block. Some fixed-term products exist, with upfront fees instead. Compare total cost, including fees and gas.

Can I lose my ETH if the price drops?

Yes. If your health factor falls below 1, a liquidator can repay part of your debt and take your collateral at a discount. Borrowing conservatively, monitoring your position and having a repayment plan reduce that risk.

How do I get my ETH back?

Repay the USDC plus accrued interest. Once the debt is fully repaid, the collateral is released and you can withdraw it.