Smart Ways to Lower Crypto Tax Costs After a 1099 Form

⭐If you received a Form 1099-DA, you still control your reported cost basis and accounting method for any un-covered lots. Filing straight from the form, matching cost basis by wallet, and harvesting losses before December 31 are the three moves most likely to cut what you owe.⭐

If a 1099-DA landed in your inbox this year, the honor-system era of crypto tax filing is over. Your exchange now sends the IRS the same information it sends you, which means mismatches get flagged faster than they used to. That's not a reason to panic. It's a reason to get specific about the handful of legal choices that still belong to you: which lots you sell, which accounting method you apply, and when you realize a loss.

Starting with the 2025 tax year, brokers such as Coinbase and Kraken began reporting gross proceeds from digital asset sales to the IRS on Form 1099-DA, the crypto equivalent of the 1099-B long used for stocks. For transactions occurring in 2026, reporting expands to include cost basis and acquisition date — but only for "covered" assets, meaning coins bought and held in the same broker account from January 1, 2026, onward. Anything you bought earlier and are selling now arrives on your 1099-DA with proceeds filled in and cost basis left blank. You still have to supply that number, and how you calculate it changes your tax bill.

Why Your 1099-DA Might Overstate What You Owe

The most common and costly mistake this filing season is reporting the 1099-DA's proceeds figure without subtracting your actual cost basis. If your broker didn't report basis — which, for most pre-2026 holdings, it won't — the form can make it look like your entire sale proceeds are taxable, when only the gain above what you paid actually is.

Say you bought one bitcoin for $30,000 in 2021 and sold it in 2026 for $90,000. Your 1099-DA reports $90,000 in gross proceeds. If you file that number as taxable income without applying your $30,000 basis, you'd overpay tax on $30,000 of money that was never a gain. The IRS doesn't automatically calculate your basis for you on uncovered lots — that responsibility sits with you, using your own trading records, exchange statements, or crypto tax software that reconstructs cost basis from wallet history.

Choose Your Accounting Method Before You File, Not After

Once you know your basis, the accounting method you apply to a partial sale determines exactly how much gain you recognize. The IRS permits First-In-First-Out (FIFO), Last-In-First-Out is generally not allowed for securities-style assets, and — critically — Specific Identification, including the Highest-In-First-Out (HIFO) variant, provided you can document which specific units you sold at the time of the transaction.

Method	How it selects lots	Typical tax result	Best fit
FIFO (default)	Sells your oldest coins first	Often the largest taxable gain in a rising market, but more likely to qualify for lower long-term rates	Investors who bought early and held; simplest recordkeeping
Specific Identification	You choose which exact lot to sell	Lets you match a sale to a specific purchase price and holding period	Traders with detailed records across multiple buys
HIFO (a form of Specific ID)	Sells your highest-cost coins first	Minimizes the reported gain in the year of sale	Investors sitting on a mix of high- and low-cost lots who want to reduce this year's bill

Since the IRS finalized Revenue Procedure 2024-28, taxpayers have been required to allocate cost basis on a wallet-by-wallet or account-by-account basis rather than pooling all their holdings across every exchange into one universal basis. If you never made that allocation, your broker likely defaulted you to FIFO, which is not always the most tax-efficient choice. You can still use Specific Identification or HIFO going forward, but only if your records — or your exchange's transaction history — can identify which lot you actually sold at the moment of the trade, not reconstructed afterward.

Worked example: Maria bought crypto in three separate lots — 0.5 BTC at $20,000 in 2020, 0.5 BTC at $45,000 in 2022, and 0.5 BTC at $65,000 in 2024 — all in the same exchange account. In 2026 she sells 0.5 BTC for $85,000.

• Under FIFO, she's deemed to sell the 2020 lot: gain = $85,000 − $20,000 = $65,000, taxed at long-term capital gains rates (held over a year).
• Under HIFO, she sells the 2024 lot: gain = $85,000 − $65,000 = $20,000, but because that lot was held less than a year in this scenario, it would be taxed at her ordinary income rate instead of the lower long-term rate.

The lesson isn't that one method always wins — it's that the smaller gain and the better tax rate don't always live in the same lot. A trader in the 32% federal bracket comparing a $65,000 long-term gain taxed at 15% ($9,750) against a $20,000 short-term gain taxed at 32% ($6,400) would still come out ahead choosing HIFO here, but the margin narrows the longer you've held your oldest coins. Run both numbers before you file; don't assume the smaller headline gain is automatically the smaller tax bill.

Harvest Losses Before the Calendar Year Closes

Crypto is currently not subject to the wash-sale rule that applies to stocks and mutual funds under Internal Revenue Code Section 1091, meaning you can sell a losing position, immediately realize the capital loss, and repurchase the same coin the same day without forfeiting the deduction. This remains one of the more significant, legal timing advantages available to crypto investors, though Congress has proposed closing this gap in prior legislative sessions — a change that hasn't been enacted as of this writing but is worth watching if you plan around it every year.

Realized losses offset realized gains dollar for dollar, and up to $3,000 of net losses beyond that can offset ordinary income each year, with any excess carried forward indefinitely. If you're holding coins below your purchase price alongside coins with gains, selling both in the same December can meaningfully reduce your net taxable amount — and, unlike stock investors, you don't need to wait 31 days to buy back in.

Where the UK Rules Diverge

UK-based investors don't receive a 1099-DA — HMRC's system runs on self-assessment rather than third-party broker forms — but the underlying discipline is the same. HMRC treats crypto as a chargeable asset, so each disposal (a sale, a trade for another token, or spending it) is a capital gains event. For the 2026/27 tax year, individuals have a £3,000 annual exempt amount covering total gains across crypto, shares, and other assets combined; gains above that are taxed at 18% within your remaining basic-rate band and 24% above it. Losses reduce your taxable gain the same way they do in the US, and HMRC allows a form of pooling ("Section 104 pooling") that functions similarly to an average-cost method — a UK investor generally can't cherry-pick specific lots the way a US taxpayer using Specific Identification can, which is a genuine structural difference worth knowing before you assume US strategies translate directly.

Risk and Suitability

Aggressive lot selection only works if your documentation would survive an audit. The IRS has stated that if your self-reported basis doesn't match what a 1099-DA (once basis reporting is mandatory) shows, your return is more likely to be flagged for review. Keep contemporaneous records — trade confirmations, wallet addresses, and timestamps — rather than reconstructing a convenient basis after the fact. None of the strategies above change what you owe on income-classified crypto events, such as staking rewards or mining income, which are taxed as ordinary income when received, separately from capital gains treatment on later disposal.

What Changes Next Filing Season

The 2026 tax year is the transition point, not the finish line. Forms covering 2026 sales — arriving in early 2027 — will include mandatory cost basis for any "covered" digital assets, meaning coins bought and held in that same broker account from January 1, 2026, onward. If you move coins between exchanges or into self-custody and back, you can break that covered status and land right back in the position of calculating your own basis, so the reporting mandate doesn't remove the need for personal recordkeeping — it just narrows where it applies. Expect brokers to push harder for basis-allocation elections on file well before year-end 2026, since an unallocated account defaults to FIFO whether or not that's the outcome you'd choose.

If part of what you're weighing is whether to keep trading in a taxable account at all, it's worth reading When Crypto Belongs in a Roth IRA (and When It Doesn't), which walks through why a standard Roth IRA can't hold coins directly and what a self-directed IRA changes about the tax picture.

Key Takeaways

• Your 1099-DA's proceeds figure is not your taxable gain; subtract your actual cost basis before you file.
• FIFO, Specific Identification, and HIFO can produce materially different tax bills on the same sale — run the comparison, don't default.
• Crypto isn't subject to the wash-sale rule today, so loss harvesting can happen right up to December 31 without a waiting period.
• UK investors work from HMRC's £3,000 annual exempt amount and Section 104 pooling rather than lot-level selection — the two systems aren't interchangeable.

A Pre-Filing Checklist Worth Building

Before you file, pull together: every 1099-DA received across each exchange, a full transaction export from each platform (including transfers between your own wallets, which aren't taxable but need to be reconciled so they aren't mistaken for disposals), your basis-allocation election for 2026 onward under Rev. Proc. 2024-28, and a year-end tally of unrealized losses you could still harvest before December 31. Crypto tax software that ingests exchange CSVs can automate most of this reconciliation, but it's worth spot-checking a handful of transactions by hand against your own records.

FAQ

Does receiving a Form 1099-DA mean I automatically owe more tax? No. It means the IRS now has a copy of your reported proceeds. Whether you owe tax — and how much — still depends on your cost basis, which for most pre-2026 holdings you must calculate and report yourself.

What happens if I don't have records to prove specific identification? Without contemporaneous documentation identifying which lot you sold at the time of the trade, the IRS defaults you to FIFO. You can't apply Specific Identification or HIFO retroactively just because it produces a smaller number.

Can UK investors use HIFO like US taxpayers? Not in the same way. HMRC's Section 104 pooling rules generally require an average-cost approach across most holdings of the same token, rather than letting you select specific high-cost units to dispose of first.

Do crypto-to-crypto trades trigger tax in both countries? Yes. Both the IRS and HMRC treat trading one token for another as a disposal of the token you gave up, triggering a taxable gain or loss even if you never converted to cash.

Will the crypto wash-sale exemption last? It's current law as of this writing, but it has been targeted in past US legislative proposals. Don't build a permanent strategy around a rule that Congress could change; recheck it each filing season.