Tether's USDT has maintained its $1 peg for over a decade across $189 billion in circulation, making it the dominant stablecoin for global trading and emerging-market payments, even though it has never undergone a full Big Four audit. Instead, the company publishes quarterly attestation reports from BDO Italia, a point-in-time verification that differs significantly from a comprehensive audit. This distinction matters because attestations confirm reserve figures on a single day but do not test internal controls, custody arrangements, or whether reserves were borrowed or rehypothecated during the rest of the quarter.

What Actually Backs USDT in 2026?

According to Tether's most recent quarterly attestation, USDT reserves are dominated by conservative, low-risk assets. The composition reflects a shift toward stability over the past several years, particularly after regulatory enforcement actions in 2021.

• US Treasury Bills: Roughly 80 to 84 percent of reserves, held directly or indirectly through money-market funds and repurchase agreements
• Secured Loans: Approximately 4 to 6 percent, collateralized by liquid assets to reduce counterparty risk
• Bitcoin: Around 4 to 5 percent, held as a strategic reserve rather than for operational backing
• Precious Metals: Approximately 3 to 4 percent in gold and other metals
• Other Investments: Corporate bonds and miscellaneous assets making up the remainder

Tether reports "excess reserves" of $5 billion to $7 billion across recent attestations, meaning the company holds assets above the dollar value of USDT in circulation. This cushion is designed to absorb losses, though it remains smaller than the excess reserves some competitors maintain.

Why Doesn't Tether Have a Full Audit?

The distinction between attestation and audit is the single biggest point of confusion in USDT coverage. An attestation is a snapshot on a single day; an audit is a continuous opinion over a full fiscal year that tests controls, samples transactions, and verifies custody arrangements. Tether has publicly stated that Big Four firms, including Deloitte, EY, KPMG, and PwC, have been reluctant to take on the company because of perceived reputational and regulatory risk in the broader crypto sector.

By contrast, Circle, the issuer of USDC, publishes monthly attestations from Deloitte and is moving toward a full annual audit as part of its post-IPO reporting cycle. This difference in transparency standards has become a competitive advantage for USDC in regulated markets, particularly in the United States and European Union.

How Did Tether's Regulatory Past Shape Today's Oversight?

Tether's current quarterly attestation program was not a voluntary disclosure but rather a settlement requirement. In October 2021, the US Commodity Futures Trading Commission (CFTC) fined Tether $41 million for making "untrue or misleading statements" about its reserves between June 2016 and February 2019. During that period, the company had claimed USDT was fully backed by US dollars when reserves actually included unsecured receivables and non-cash assets.

Earlier that same year, the New York Attorney General settled a separate investigation with Tether and Bitfinex for $18.5 million, covering the same time window. The settlement additionally barred Tether and Bitfinex from doing business with New York residents going forward. Tether did not admit wrongdoing in either settlement but agreed to publish quarterly reserve breakdowns, which remains the regime in place today.

What Regulatory Headwinds Is USDT Facing Now?

Tether's dominance is being tested by new regulatory frameworks in major markets. In 2025, the European Securities and Markets Authority (ESMA) finalized stablecoin rules under MiCA, the Markets in Crypto-Assets regulation. Tether did not pursue an EU e-money or asset-referenced token license, and as a result, European exchanges including Binance, Kraken, Coinbase EU, and Crypto.com began delisting USDT spot pairs for EU users through late 2024 and 2025.

In the United States, the GENIUS Act of 2025 created a federal framework for "payment stablecoins" requiring 1:1 reserve backing in highly liquid assets, monthly attestations, and either federal or state regulator oversight. Tether has not signaled it intends to register as a US payment stablecoin issuer under this framework. The practical effect is that USDT remains the dominant offshore stablecoin while USDC and PYUSD operate inside the US regulatory perimeter.

How Stable Is the USDT Peg?

USDT has held its $1 peg for over a decade across multiple market crashes, exchange collapses, and regulatory turmoil. The most notable exception occurred in May 2022 during the Terra and Luna collapse, when USDT briefly traded as low as roughly $0.95 on some venues for several hours before snapping back to $1. CoinDesk and Kaiko both documented the dislocation at the time.

Smaller intraday wobbles of a few cents have appeared during exchange outages and crypto-wide deleveraging events, but these have been temporary. Across ten-plus years, the peg has held in aggregate, though holders should not assume zero volatility, particularly during stress events when redemption queues lengthen.

What Are the Main Risks to USDT Going Forward?

While USDT's track record is strong, several structural risk categories could challenge the stablecoin in the coming years. Understanding these risks helps explain why regulatory clarity and audit transparency matter to the broader stablecoin market.

• Regional Regulatory Bans: If a large jurisdiction fully blocks USDT from exchanges, secondary-market liquidity could contract and the peg could wobble during the adjustment period, as is currently happening in the European Union
• Reserve Mark-to-Market Losses: Tether's reserves include Bitcoin and secured loans, both of which carry market risk; a sharp Bitcoin drawdown combined with loan losses could erode the excess-reserve cushion, though the base Treasury bill book is short-duration and low-volatility
• Redemption Runs: Tether only redeems directly with verified institutional counterparties with minimums historically around $100,000; a coordinated institutional redemption wave could stress liquidity even if reserves are ultimately sufficient
• Audit-Driven Confidence Shocks: Any future enforcement action or attestation discrepancy could trigger a peg break similar to USDC's March 2023 wobble after Silicon Valley Bank, even if reserves are ultimately fine

How Does USDT Compare to USDC?

Neither stablecoin is risk-free, but they carry different risk profiles. USDC carries banking-rail risk, as demonstrated by the Silicon Valley Bank episode in March 2023, which was a US banking failure rather than a USDC failure. USDT carries regulatory-tail risk and the attestation-versus-audit gap.

For US and EU users with regulatory exposure, USDC is the cleaner choice because it operates within the GENIUS Act framework in the United States and holds an EU e-money token license under MiCA. For global trading and emerging-market dollar access, USDT remains the dominant rail, with roughly $189.5 billion in circulation compared to USDC's $78.1 billion.

The material risks facing USDT are regulatory rather than reserve-based. EU delistings under MiCA, US treatment under the GENIUS Act, and the lingering question of why Tether has never produced a full Big Four audit remain the key uncertainties for long-term holders and institutional users evaluating stablecoin exposure.