Bitcoin-Backed Loans: The 50% LTV Math SALT Leaves Out of the Tweet

A $400,000 Bitcoin position and a $200,000 down payment on a house. On paper, you don't have to choose. Pledge the Bitcoin, take the loan, keep the coins. That's the pitch SALT Lending made in a video on X on October 14, and it's a pitch the crypto lending industry has been making since roughly 2016.

It's also a pitch that lives or dies on one number that never makes the tweet. Loan-to-value.

What SALT Is Actually Selling

The video runs through four uses for the proceeds. Real estate. Business expansion. Portfolio diversification. Tax planning. Each one is real. Each one also carries a completely different risk profile, and grouping them under "liquidity without selling" flattens the exact part where borrowers get hurt.

Start with the tax angle, because that's the strongest argument in the deck. The top federal long-term capital gains rate sits at 20%, plus the 3.8% net investment income tax. So a holder with a $100,000 cost basis who sells $200,000 of Bitcoin to fund a purchase realizes $100,000 of gain and hands roughly $23,800 to the IRS. Borrow the same $200,000 instead and there's no sale, so no tax event. That's a real difference. It's also a deferral, not an exemption. The bill doesn't vanish. It waits, and it grows if the asset grows.

Now the cost side. Bitcoin-backed credit has generally priced somewhere between high single digits and the mid teens in annual percentage rate, depending on term, LTV, and lender. Call it 10% on that $200,000. That's $20,000 a year in interest, plus origination fees, plus the operational hassle of managing collateral in a market that moves 8% on a slow Tuesday.

So the borrower's actual bet isn't "I like Bitcoin." It's "my after-tax return on the borrowed capital, plus the tax I deferred, beats 10% a year compounded." Frame it that way and the real estate example gets a lot less comfortable.

The Margin Call Nobody Models

Here's the arithmetic that matters. $400,000 of Bitcoin pledged against a $200,000 loan is a 50% LTV. Comfortable. Most lenders will happily underwrite it, with margin call triggers typically landing somewhere in the 70% to 80% range.

Bitcoin drops 35%. That's not a catastrophe in this asset class. That's a normal spring. Your collateral is now $260,000 against a $200,000 balance. LTV is 77%. You're in the notification zone, and depending on the terms you're either wiring more Bitcoin, posting cash, or watching the lender sell your coins at the worst possible moment.

And here's the ugly part. The drop doesn't touch your loan balance. It doesn't care that you were up 300% on the position in 2024. It only cares about the ratio today. So why does every Bitcoin loan pitch lead with real estate? Because property feels safe to a holder who's already taken risk. That doesn't make the collateral any less volatile.

Compare that to the borrower who actually should be taking these loans. A freight forwarder waits 90 days on payment against a bill of lading. A supplier needs to fund a purchase order before the buyer settles. Those are businesses where borrowed capital buys inventory or bridges a receivable, and the cash flow services the debt on a schedule. Trade finance is a $5 trillion market running on fax machines and PDF attachments, and plenty of small operators in it can't get a bank line at any reasonable price. For them, pledging Bitcoin at 10% beats losing the contract.

For the guy borrowing against his stack to buy a second home? That's not a financing decision. That's a directional bet with a liquidation clause attached.

The Takeaway

SALT isn't doing anything wrong here. The product is legitimate, the use cases are real, and the company has been underwriting this credit for roughly a decade, which is longer than most of its competitors survived. But sponsored video content has a way of presenting the upside of a loan and the mechanics of a loan without ever sitting the viewer down with the downside.

So run one test before you sign anything. Write down your exit. Not the plan for the money. The exit. It's one of three things: you refinance when the loan matures, you repay from cash flow you can point to today, or you sell Bitcoin at a price higher than the balance plus interest plus fees. If you can't name which one and show the numbers, you're not accessing liquidity. You're delaying a sale and paying 10% a year for the privilege.

Bitcoin-backed lending will keep growing, and it should. Credit against productive assets is how capital markets work, and this asset class is now big enough and liquid enough to support it. But the borrowers who win are the ones who treat the loan as a tool with a repayment plan, not as a way to avoid making a decision.

The container doesn't care about your consensus mechanism. Neither does your lender's margin desk.