The question used to be simple: hold bitcoin on an exchange or in your own wallet? For most of crypto’s history the answer was framed entirely around security, meaning who can lose your coins and how. Starting with the 2026 tax year, the same choice also changes what appears on your tax paperwork, because brokers now report cost basis only for assets they actually held in custody for you.
The distinction that drives everything is the private key. In a self-custody wallet you control the key that moves the coins, and the SEC’s investor bulletin on crypto custody states the trade-off plainly: if you lose the key, you permanently lose access, with no company to call to restore it. On an exchange the company holds the key and your balance is an obligation it owes you, so your exposure is the custodian itself being hacked, shut down, or going bankrupt. The same bulletin notes practices some custodians use, such as lending customer assets and pooling them together.
Neither arrangement carries the safety nets that cover bank or brokerage accounts. The FDIC said in 2022 that deposit insurance does not apply to crypto assets or to the failure of a non-bank such as a crypto company; it protects deposits only when an insured bank fails. SIPC likewise states that it does not protect crypto that does not qualify as a security, even at a member brokerage. Some exchanges hold customers’ dollar balances at insured banks, but that covers the cash, not the coins. The FTX collapse shows the stakes: the Justice Department reports that Samuel Bankman-Fried was sentenced to 25 years for stealing more than $8 billion in customer funds.
Since 2026 the custody choice also changes your tax records. Under the IRS instructions for Form 1099-DA, an asset is “covered”, meaning the broker reports its basis, only if it was acquired in an account the broker held in custody for you and stayed there until sale. Coins bought elsewhere and transferred in are “noncovered”: the form shows proceeds without basis, and you must supply the basis from your own records. Moving coins between wallets or accounts you own is itself a non-taxable event under IRS FAQ 81, apart from any crypto spent on transaction fees. The result is a real asymmetry: identical bitcoin can reach the same exchange with its basis already reported, or with none, depending on where it lived in between.
None of this makes one option universally safer. Holding on an exchange fits small balances, frequent trading, and people who are not prepared to protect a seed phrase, and it preserves the broker’s basis reporting for coins bought there. Self-custody fits larger, long-term holdings where a custodian’s failure, lending, or commingling would be the larger exposure, provided you can secure the seed phrase and keep your own purchase records. The two can be combined, but the IRS default rules then apply account by account, so transfers and basis need tracking in each.
Two things are worth rechecking every year rather than memorizing once: the IRS’s Form 1099-DA instructions and the custody terms in an exchange’s user agreement, both of which change. This is educational background, not tax or legal advice, and specific decisions belong with a qualified professional.
Source: BTCUSA.