Selling Bitcoin to raise cash realizes a capital gain or loss. Borrowing against it, in most cases, does not. That difference is the entire reason Bitcoin-backed loans exist as a strategy for long-term holders. But the details matter, and "generally not taxable" is not the same as "never taxable."
Why a loan isn't a sale
Under current US tax treatment, pledging Bitcoin as collateral for a loan is handled much like pledging any other property as collateral: you receive loan proceeds, you still own the asset, and there is no disposition. Because you haven't sold or exchanged the Bitcoin, there is generally no realization event, and therefore no capital gain to report when the loan is originated. The IRS treats Bitcoin as property (Notice 2014-21), so the ordinary rule for property applies: gain is realized only on a sale or exchange (IRC §1001; Treasury Regulation §1.1001-1(a)), and posting collateral is neither.
The loan proceeds themselves are not income, either. A loan is money you have to pay back, not money you've earned.
What selling triggers instead
Selling is the opposite. The moment you sell Bitcoin, you realize the difference between your sale price and your cost basis as a capital gain (or loss) in that tax year (IRC §1001). If the Bitcoin has appreciated significantly and you've held it less than a year, that gain can be taxed at ordinary income rates; held longer, at long-term capital-gains rates. For a holder sitting on large unrealized gains, that single event can be the most expensive part of raising cash.
Borrowing defers that reckoning. The trade-off is that you take on interest cost and margin-call risk instead. That is exactly the comparison our sell vs. borrow framework and calculator are built to make concrete.
The rehypothecation gray area
There is one structural wrinkle worth understanding. If your lender rehypothecates your collateral, meaning it re-lends or reuses your pledged Bitcoin for its own purposes, some tax practitioners have questioned whether that changes the character of the arrangement, since your specific coins may no longer be sitting untouched. This is an unsettled area rather than a clear rule, and it is one more reason to prefer lenders that hold collateral in segregated or collaborative-custody arrangements where rehypothecation is disclosed or structurally impossible.
What turns the corner from "loan" to "sale" is control. Courts look at whether you keep the right to get your specific asset back. In Samueli v. Commissioner (132 T.C. 4, 2009), the Tax Court denied tax-free treatment to a securities loan precisely because the lender could not recall the same securities on short notice and had surrendered the economic benefits of ownership. That case turned on a securities-lending rule (IRC §1058), but the principle carries over: if a lender rehypothecates your Bitcoin and you can no longer be sure of reclaiming the same coins, the IRS could argue you have effectively disposed of the property under IRC §1001, even though it was framed as a loan.
A forced liquidation is a different story. If your collateral is sold to satisfy the loan, that sale is a disposition and does realize a gain or loss, just as a voluntary sale would.
What this means in practice
- Originating a Bitcoin-backed loan is generally not a taxable event.
- The cash you borrow is not taxable income.
- Selling Bitcoin, or having it liquidated, is a realization event that triggers capital gains.
- Rehypothecation introduces uncertainty; favor lenders that don't do it.
Primary sources
The general rules here are well established, even though the IRS has not issued crypto-specific guidance on collateralized loans:
- IRS Notice 2014-21 (2014-16 I.R.B. 938): virtual currency is treated as property, so the general tax principles for property transactions apply.
- IRC §1001 and Treasury Regulation §1.1001-1(a): gain or loss is realized on the sale or exchange of property, including an exchange for property that differs materially in kind or extent.
- IRC §1058 and Samueli v. Commissioner, 132 T.C. 4 (2009): a transfer styled as a loan can still be a taxable disposition when the owner gives up the right to recall the same property and the economic benefits of ownership.
For a fuller treatment, see our Bitcoin tax considerations whitepaper.
This is not tax advice
borrow/on/bitcoin is a comparison publisher, not a tax advisor, and tax treatment depends on your specific situation and on rules that can change. Confirm anything here with a CPA who is familiar with digital assets before acting on it.