Mercury Treasury AI
Automated high-yield treasury for startups with $250K+
Best-in-class yield for Mercury customers who park $250K+ idle cash. Same-day liquidity and auto-transfers beat most business savings accounts. The high minimum and US-only eligibility limit reach, but for eligible startups it's a no-brainer addition to Mercury's ecosystem.
- Growth-stage startups with $250K+ in cash reserves wanting automated yield
- Mercury business banking customers seeking to maximize idle cash returns
- Companies needing same-day liquidity alongside high-yield investment
- Founders who want a unified financial platform (banking + treasury + AI)
- Businesses without a Mercury account or below $250K in Mercury deposits
- Non-US entities or LLCs taxed as sole proprietorships
- Nonprofits, registered investment advisers, or securities brokers/dealers
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Skip Mercury Treasury if you don't have a Mercury account or have less than $250K in total Mercury deposits.
Monthly fee of 0.15%–0.6% on Treasury positions (included in net yield)
Mercury Treasury itself has no separate subscription fee—just a transparent 0.15%-0.6% monthly fee embedded in the yield. The minimum $250K balance is high, but for qualifying startups, the automated yield is a good deal compared to Brex Cash (which offers lower APY on idle cash) or Rho (which requires a separate treasury account).
In short
Mercury Treasury AI — Automated high-yield treasury for startups with $250K+. Best for Growth-stage startups with $250K+ in cash reserves wanting automated yield, Mercury business banking customers seeking to maximize idle cash returns, Companies needing same-day liquidity alongside high-yield investment. Free to start; paid plans from $29.9/mo.
What's new in Mercury Treasury AI
Checked 15 days agoAcross the latest 3 updates: 2 feature updates and 1 news mention.
Introducing Mercury Command AI for finances, built directly into your account.
Mercury launched Command AI, an AI assistant for financial management integrated directly into accounts.
Mercury enters payroll
Mercury launched a payroll service, expanding its product suite for business banking.
Mercury applies for OCC national bank charter to become the bank for builders
Mercury filed for a national bank charter with the OCC to operate as a full bank.
Viability Score
How likely is Mercury Treasury AI to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
Last calculated: July 2026
How we score →Key Features
- Earn up to 3.61% net yield on idle cash
- Same-day withdrawals from Treasury Money Market fund
- Auto-transfer rules between operating and investment accounts
- Custom portfolio allocation across JPM and Morgan Stanley funds
- No account opening or transaction fees
- Transparent fee structure (0.15%–0.6% monthly)
- Minimum $250K balance requirement across Mercury accounts
- Personalized portfolio management for $25M+ (by Morgan Stanley)
- FDIC insurance up to $5M on checking/savings
- Command AI assistant for financial management
- Payroll service (launched May 2026)
- SAFE creation and management
- Working capital loans and venture debt
- IO Mastercard with 1.5% cashback
- Accounting automations and invoicing
About Mercury Treasury AI
Mercury Treasury AI is a cash management service for high-growth companies, offering automated investing in lower-risk mutual funds with net yields up to 3.61% (as of 05/31/2026). Exclusively for Mercury account holders with at least $250K in total Mercury deposits, it provides same-day liquidity and customizable portfolio allocation across top-tier funds like J.P. Morgan U.S. Treasury Plus Money Market Fund and Morgan Stanley Ultra-Short Income Portfolio. Key features include auto-transfer rules between operating and investment accounts, no account opening or transaction fees, and an upgrade to personalized portfolio management (Mercury Treasury Solutions by Morgan Stanley) for balances of $25M+. Unlike traditional high-yield accounts that lock up funds, Mercury Treasury keeps money accessible while earning competitive net yields. It's ideal for startups and scale-ups that want to maximize idle cash returns without sacrificing liquidity or incurring extra administrative overhead. Mercury Treasury AI distinguishes itself by integrating seamlessly with Mercury's business banking ecosystem, offering a unified platform for checking, savings, expense management, venture debt, payroll, and the new Command AI assistant.
Behind the Verdict
Mercury Treasury AI is a compelling option for startups already using Mercury for banking. If you're sitting on $250K+ in deposits, the automated yield (up to 3.61% net) is hard to beat — especially with same-day liquidity on the Treasury Money Market fund. The auto-transfer rules let you set and forget, sweeping idle cash into investments and pulling it back when needed. Compared to Brex Cash or Rho, Mercury Treasury offers a tighter integration with your operating account and a broader suite of financial tools (payroll, cards, venture debt). But the $250K minimum is steep — smaller startups can't access it. Also, it's only for US entities; international companies are out. Where it bites: the ultra-short bond fund takes 1-2 days to withdraw, and the fee tiers (0.15%–0.6% monthly) can eat into yield at lower balances. Still, for Mercury loyalists with cash to spare, this is a solid, low-hassle way to earn more than a typical business savings account.
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Real-world workflow fit
Concrete scenarios for the personas Mercury Treasury AI actually fits — and what changes day-one when you adopt it.
Set up auto-transfer rules to sweep anything above $500K into Treasury Money Market fund
Outcome: Earns ~3.15% net yield on $2.5M idle cash while retaining same-day access
One-time allocation of funds to JPM Treasury Plus fund
Outcome: Yields 3.00% net with ability to withdraw same-day
Use Cases
- Automate weekly transfers from checking to Treasury investment accounts based on cash flow forecasts.
- Earn up to 3.66% APY on idle cash while retaining same-day access for unexpected expenses.
- Use AI cash flow predictions to optimize runway and make informed spending decisions.
- Set up custom auto-transfer rules to maintain target balances in operating and investment accounts.
- Monitor treasury performance and rebalance portfolio allocation across mutual funds via the dashboard.
- Integrate treasury data with QuickBooks or Xero for seamless accounting reconciliation.
Models Under the Hood
as of 2026-07-05
Limitations
- Requires a Mercury business account and at least $250K aggregate balance to unlock Treasury.
- Funds are invested in mutual funds rather than FDIC-insured accounts, introducing market risk.
- Higher-yield options may exist for larger balances through separate platforms.
as of 2026-06-24
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published Mercury Treasury AI tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Mercury
$0/mo
Ideal for
Startups that only need basic banking and Treasury access without advanced invoicing or API features
What this tier adds
Free tier; includes banking, Treasury access with $250K balance, company cards, expense management, basic invoicing (no ACH debit), bill pay, and accounting integrations
Mercury Plus
$29.90/mo
Ideal for
Growing businesses that need recurring invoices, invoicing API up to 500/mo, and reimbursements for up to 20 users
What this tier adds
Adds recurring invoices, ACH debit at $1/transaction, invoicing API (500/mo), 1099 tax filings, and $50 off LegalZoom Compliance Plans
Mercury Pro
$299/mo
Ideal for
Complex operations needing a relationship manager, unlimited invoicing API, NetSuite integrations, and larger reimbursement limits
What this tier adds
Adds relationship manager, $0 ACH debit per transaction, unlimited invoicing API, NetSuite categorizations, and up to 250 reimbursable users
Where the pricing makes sense
The company stage and team size where Mercury Treasury AI's pricing actually pencils out — and where peers do it cheaper.
Mercury Treasury itself has no separate subscription fee—just a transparent 0.15%-0.6% monthly fee embedded in the yield. The minimum $250K balance is high, but for qualifying startups, the automated yield is a good deal compared to Brex Cash (which offers lower APY on idle cash) or Rho (which requires a separate treasury account).
Setup time & first value
How long it actually takes to get something useful out of Mercury Treasury AI — broken out by persona, not the marketing-page minute.
For existing Mercury customers: enable Treasury via settings, then allocate funds—takes under 10 minutes. Custom auto-transfer rules add ~30 minutes to configure. No separate underwriting or approval needed if you already meet the $250K balance.
Switching to or from Mercury Treasury AI
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From Brex Cash: Close Brex account, open Mercury account, transfer funds, enable Treasury
- →From Rho: Close Rho account, open Mercury account, transfer funds, set up auto-transfers
- ↗To Brex Cash: Close Mercury Treasury positions, transfer funds to Brex
- ↗To Rho: Close Mercury Treasury positions, transfer funds to Rho
Integrations
Resources & Guides
- Resourcemercury.com
Mercury Treasury | Automatic Cash Management for High Growth Companies
Automated cash management with Mercury Treasury. Earn improved yields with lower-risk, high-liquidity mutual funds. Powered by J.P. Morgan & Morgan Stanley. Apply here.
- Resourcemercury.com
Explore Pricing | Mercury
Our pricing works with your business, whether you’re bootstrapped or venture-backed. Think about something other than fees.
- Resourcemercury.com
Mercury Release Notes | Latest Features & Product Updates
Stay up to date with Mercury’s latest product releases, feature updates, and improvements. See what’s new and how it helps your business scale.
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Mercury Blog | Insights, Inside Mercury & Meridian
Explore practical resources and inspiration for ambitious founders.
- Resourcemercury.com
Help
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