Mercury vs Rho 2026: Fees, Cards, Treasury and Which Startup Should Pick Which

Pick Mercury if you want the simplest flat-rate card and one bank login; pick Rho if the treasury and the card cashback matter more than the interface. Both charge nothing for the account, ACH and domestic wires. Mercury's IO card pays a flat 1.5% cashback, and its paid tiers add features for a monthly fee. Rho charges no subscription at all, opens treasury at $50,000 instead of $250,000, and pays up to 2% cashback once you qualify for Rho Platinum.

Prices and rates below were read on Mercury's pricing page, Mercury Treasury, Rho's pricing page, Rho Treasury and Rho's corporate card page on October 26, 2026. Toolradar data: in the catalog of Toolradar, the software directory we run, Mercury is listed as an alternative to 47 other tools, fourth of 89 in expense management, while Rho is listed against 4, as of October 2026. Buyers cross-shop Mercury far more often; Rho is the challenger pitching lower fees.

At a glance

A startup's banking and spend stack, for this comparison, is the account that holds operating cash, the rails that move it, the cards the team spends on, and the place idle cash earns yield. Both companies are fintechs, not banks: Mercury works through Choice Financial Group and Column N.A., Rho through Webster Bank, a division of Santander Bank, N.A., and Lead Bank, all Members FDIC.

The two zero-fee claims, compared honestly

Rho's zero-fee claim is the broader one. Its fee summary lists $0 for subscriptions, checking minimums, per-user fees and its AP, expense and accounting automation. There is no paid tier to grow into, so a 10-person startup and a 200-person company pay the same software bill: nothing.

Mercury's free plan covers the account, not every feature. The base plan includes checking and savings, free ACH, wires, real-time payments and checks in USD, bill pay and the IO card. Plus, at $35 a month on monthly billing or $29.90 a month billed annually, adds ACH debit invoicing at $1 per transaction, recurring invoices, unlimited 1099 filings and priority support. Pro at $350 a month, or $299 billed annually, adds a relationship manager, free ACH debit invoicing and NetSuite categorizations. On annual billing, a year of Plus costs $358.80 and a year of Pro $3,588, our arithmetic from the monthly-equivalent prices.

Most early startups never need Plus. The paid tiers matter only if you invoice customers by ACH debit, file many 1099s or want a named contact, which is the kind of feature Rho bundles at no charge. Mercury also sells add-ons: Mercury Books lists at $35 a month, waived through December 31, 2026 for customers who subscribe by December 1, and Payroll lists at $100 a month plus $50 per person paid, also waived through year-end.

Wires and international payments

Domestic money movement is a tie: both are free. Both send same-day ACH and domestic wires free, and Rho also charges nothing to recall a domestic wire.

International is where the two fee schedules diverge. Mercury charges nothing to send a USD international wire, while Rho lists an optional $15 SWIFT fee and a $30 fee to recall an international wire from checking. Both charge 1% to convert currency. Rho adds that intermediary banks can take their own fees on USD wires, and its international payments run through Wise US Inc.

For a startup paying a few overseas contractors in USD each month, Mercury is cheaper on the rail itself. For one paying suppliers in euros or pounds, the 1% conversion fee is the same on both, so the decision moves to the card and the treasury.

Cards and cashback: flat 1.5% versus conditional 2%

Mercury's IO card is the simpler deal. It pays unlimited 1.5% cashback on all spend, deposited into the linked account, with no personal guarantee, no interest and no annual fee. Limits are based on the balance you hold at Mercury and any external accounts you link. New customers with lower balances start on daily payments and move to monthly payment terms with a $15K balance. Non-USD card transactions carry a 3% currency exchange fee.

Rho's card can pay more, but the rate depends on your terms and your status. Standard cashback is up to 1.25% on Daily Terms and up to 1% on Monthly Terms. Rho Platinum raises those to up to 2% and 1.75%, on up to $1M of eligible annual card spend, and some categories are excluded. Platinum is a status with no fee, granted when payroll is funded from Rho, revenue lands in Rho, at least 50% of company assets sit at Rho and the company has an open Rho card. Monthly Terms opens at $25,000 held at Rho, or $75,000 including linked external accounts.

Here is what that means on $50,000 a month of card spend. Over a year, $600,000 on Mercury IO earns $9,000 in cashback. On Rho, the same spend earns up to $7,500 on standard Daily Terms, up to $6,000 on standard Monthly Terms, up to $12,000 on Platinum Daily Terms and up to $10,500 on Platinum Monthly Terms. Those totals are our arithmetic from the published maximum rates, before any excluded categories. Rho beats Mercury only if you move payroll, revenue and most of your cash to Rho; otherwise Mercury's flat rate wins.

Treasury and yield on a $2M balance

Rho opens treasury to more startups and prints its net yield by tier. The minimum is $50,000, and the management fee is 0.60% a year under $2M, 0.45% from $2M to $5M, 0.35% to $10M, 0.25% to $20M and 0.15% above $20M. Its table shows net yields after that fee. One tier up, for balances of two to five million dollars, Rho listed 3.39% in the JPMorgan Treasury Plus money market fund, 3.58% in a Morgan Stanley ultra-short fund and 3.69% in 13-week Treasury bills, with yields as of October 23 and 24, 2026.

Mercury Treasury needs $250,000 across Mercury accounts before you can use it. Its table shows up to 3.77% net in a government money market fund (MRGXX) with same-day liquidity and up to 4.09% in an ultra-short bond fund (MCRYX) with one-to-two-day liquidity. The footnote adds that the 4.09% figure assumes total Mercury deposits of $20M or more and that treasury carries a 0.15% to 0.60% annual fee based on total balances. Mercury's two pages therefore give a range, not a tier-by-tier fee, so ask Mercury for the net rate at your balance before you compare.

Our scenario: a startup holds $2M, keeps $500,000 in checking and invests $1.5M. On Rho, that $1.5M sits in the lowest fee tier, at 0.60%; in Treasury bills at Rho's printed 3.54% net for that tier, it would earn about $53,100 a year at today's rate, our arithmetic. Yields change daily and none of these figures is guaranteed. The money market and ultra-short funds are investments, not deposits, and carry no FDIC insurance on either platform.

FDIC coverage and where the cash sits

Mercury offers up to $5M of FDIC insurance through its partner banks and their sweep networks, applied to checking and savings. Rho splits the answer. Funds in Rho checking at Lead Bank get pass-through FDIC coverage up to $250,000 per depositor per bank, while Rho Business Savings spreads deposits across 400+ partner banks for up to $75M of coverage per entity. Savings pays up to 1.00% APY, variable as of August 2026, on a $25,000 average monthly balance.

For a startup that just closed a round and wants every dollar insured without buying funds, Rho's savings product offers the higher ceiling. For one that keeps a few million in operating cash and wants one account to manage, Mercury's sweep is simpler. Board memos should name the partner banks either way.

Spend management and the back office

Both include AP, expense management and accounting sync on the free plan. Mercury's base plan covers bill pay, cards with custom limits and merchant locks, and duplicate subscription detection. Rho's fee summary lists AP, expense and accounting automation as free, with no per-user fee, and its treasury syncs with QuickBooks Online, NetSuite and Sage Intacct for reconciliation.

The difference is the upgrade path. A Mercury customer who wants a relationship manager or free ACH debit invoicing pays for Pro. A Rho customer gets the same platform at every size and pays only the treasury fee and the international fees in the table above. For the wider field, see the best spend management platforms, the best corporate cards and the best treasury management software.

Who should pick which

• Pick Mercury if you want one clean bank login, the flat 1.5% IO cashback without moving payroll and revenue, free USD international wires, and the larger FDIC sweep on checking. The Mercury review covers the product in depth, and Mercury vs Brex compares it with a spend-first platform.
• Pick Rho if you hold between $50,000 and $250,000 of idle cash, which Mercury Treasury cannot take yet, if you will run payroll and revenue through Rho to earn Platinum cashback, or if you want AP and expense automation with no subscription at any size. The Rho review covers its full product set.
• Use both if the board wants two banking relationships: operating cash and cards on one, reserves on the other.

Spend-first alternatives are compared in Ramp vs Brex, Brex pricing 2026 and the Brex review, and the wider field of expense tools sits in the best expense management software roundup. To size the cash you can invest, start with a 13-week cash flow forecast.

How we compared

We read Mercury's pricing, treasury and IO credit card pages and Rho's pricing, treasury, corporate card and business savings pages on October 26, 2026. Scenario totals are our arithmetic from published rates: cashback on $600,000 of annual card spend at each maximum rate, and Rho's printed net Treasury bill yield for the lowest fee tier on $1.5M. We did not open accounts or test either product. This page is general information, not personalized financial advice. Confirm fees, yields, cashback terms and FDIC coverage with Mercury and Rho before you move an account.

FAQ

Is Mercury or Rho better for a startup in 2026?

Mercury is the better default for a startup that wants a flat 1.5% card, free USD international wires and a multi-million FDIC sweep in one account. Rho is better for a startup that wants no subscription at any size, treasury from a $50,000 balance and up to 2% cashback after moving payroll, revenue and most of its cash to Rho.

How much does Mercury cost compared with Rho?

Both business accounts cost $0. Mercury sells Plus at $35 a month, or $29.90 billed annually, and Pro at $350 a month, or $299 billed annually. Rho has no paid tier and no per-user fee; its costs are a 0.15% to 0.60% treasury fee, a 1% currency conversion fee and optional international wire fees.

Which has the better treasury yield?

Rho prints net yields by balance tier, from 3.24% to 3.99% depending on balance and product as of October 23 and 24, 2026, and opens treasury at a lower balance. Mercury shows up to 3.77% in a money market fund and up to 4.09% in an ultra-short bond fund, but notes the 4.09% assumes $20M or more in deposits and requires a larger balance to start.

Which card pays more cashback, Mercury IO or Rho?

Mercury IO pays a flat 1.5% on all spend. Rho pays up to 1.25% on Daily Terms or 1% on Monthly Terms, rising to up to 2% or 1.75% with Rho Platinum, which requires payroll, revenue and at least half of company assets at Rho. On $600,000 of annual spend, that is $9,000 on Mercury against $6,000 to $12,000 on Rho, our arithmetic.

Are Mercury and Rho FDIC insured?

Neither is a bank. Mercury offers up to $5M of FDIC insurance through Choice Financial Group, Column N.A. and their sweep networks. Rho checking has pass-through coverage up to $250,000 per depositor at Lead Bank, and Rho Business Savings offers up to $75M per entity across 400+ partner banks. Treasury funds on both platforms are investments and are not FDIC insured.

Cite this: CFOpresso, "Mercury vs Rho 2026: Fees, Cards, Treasury and Which Startup Should Pick Which", November 2026.

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