Tether Turns to Big Four for First Full USDT Reserve Audit

Key Takeaways

Tether said on March 24 that it had engaged a Big Four accounting firm for its first independent financial statement audit.
The stablecoin company did not name the auditor or disclose when it would complete or publish the audit.
Tether has long relied on periodic attestations and faced years of scrutiny over the reserves backing USDT.

After years of questions over the reserves backing USDT, Tether says it has engaged a Big Four accounting firm for its first independent financial statement audit. The company announced the move on March 24 but did not name the firm or say when the review would be completed.

Tether said the engagement followed onboarding reviews of its systems, internal controls and financial reporting.

Tether Escalates Transparency Push

The stablecoin giant has spent years defending the composition and quality of the assets backing USDT, the world’s largest stablecoin.

Scrutiny has often focused on the liquidity, makeup and risk profile of those reserves.

Tether has said its reserves include the U.S. Treasurys and other assets, while prior assurance reports also showed exposure to Bitcoin, gold and secured loans.

Its current disclosure model centers on periodic attestations rather than a published audit, a distinction critics have often pointed to when questioning the company’s transparency.

The company has been laying the groundwork for a broader review for some time.

In March 2025, Tether appointed Simon McWilliams as chief financial officer and said he would help lead the company toward a full audit.

Later that month, CEO Paolo Ardoino said Tether was already in talks with a Big Four firm.

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What Tether Said and What Remains Unclear

Tether said the engagement marks its first independent financial statement audit and framed it as a broader transparency milestone for the stablecoin sector.

The company also indicated that the review would cover its financial statements rather than provide another limited reserve snapshot.

Major details remain unresolved.

Tether did not disclose which Big Four firm it hired, when it will publish audited statements, or how long the engagement will take.

The term refers to Deloitte, PwC, EY and KPMG.

That leaves a familiar question hanging over the market: when will the audit be completed and made public?

The review may also carry broader significance for Tether’s business plans.

Reports that Tether has explored raising as much as $20 billion increase the stakes around when the company completes and publishes audited financial statements.

Why It Matters for Crypto Markets

USDT plays a central role in crypto trading and settlement.

That gives Tether an outsized role in how liquidity moves across the market.

Any change in how the company reports its reserves will draw attention well beyond the stablecoin issuer itself.

Tether had more than $140 billion in dollar-pegged tokens in circulation last year and was already signaling a stronger audit push as U.S. rules around stablecoins became clearer.

If the audit is completed and published, it would be the most extensive outside review yet of the reserves behind crypto’s largest stablecoin.

Audit Lands in a Tense Stablecoin Moment

The timing gives Tether’s announcement a wider market context.

The company’s audit push landed as U.S. lawmakers remain deadlocked over crypto market-structure legislation and as the latest Senate compromise on the CLARITY Act rattled stablecoin-linked stocks, including Circle.

Against that backdrop, Tether’s decision to pursue a full audit appears to be a bid to strengthen credibility at a time when both regulation and competition are putting fresh pressure on the stablecoin sector.