Most founders open a Mercury or Brex account on day one without comparing the actual differences — and that decision matters more at $2M in the bank than it did at $20K.
Mercury, Brex, Arc, and Relay are the four accounts that dominate the venture-backed startup banking landscape in 2026. Each targets a different stage and use case: Mercury is the default for early-stage, Brex is the institutional standard for high-growth companies, Arc is the yield optimizer, and Relay is the team controls specialist. The right choice depends on your current ARR, headcount, monthly burn, and what you are actually optimizing for.
Here is a direct ranked comparison of all four — with real pricing, real pros and cons, and a clear verdict for each founder type. You can also benchmark your financial operations against peers on the Startup Benchmarking Dashboard.
Mercury vs Brex vs Arc vs Relay: Ranked for 2026
Quick Comparison: Mercury vs Brex vs Arc vs Relay
| Feature | Mercury | Brex | Arc | Relay |
|---|---|---|---|---|
| Monthly fee | Free | Free / $12–15/user | Free | Free / $30/mo |
| FDIC coverage | Up to $5M (sweep) | $250K standard | $250K standard | Up to $3M (IntraFi) |
| Yield on cash | ~4.9% APY (Treasury) | ~5.0% APY (Cash) | ~5.1–5.3% APY | None |
| Corporate card | Mercury Debit / Credit (limited) | Yes (high limits) | Arc Card (1.5% cashback) | Debit per sub-account |
| Sub-accounts | Yes (unlimited) | Limited | Limited | Up to 20 (free) / 50 (Pro) |
| Expense mgmt | Basic | Full (AI-powered) | Basic | Basic |
| Best stage | Pre-seed → Series A | Series A → growth | Any (yield focus) | Pre-seed → seed |
How to Choose: Which Startup Bank Is Right for Your Stage
Pre-seed / Bootstrapped
Mercury
Zero fees, extended FDIC coverage, and Mercury Treasury for yield on any amount — even $50K in the bank earns real money at 4.9% APY. The UX is clean enough that non-finance founders can run their full financial operations without a CFO.
Seed ($1M–$5M raised)
Mercury + Arc
Use Mercury for day-to-day operations and Arc Treasury for idle runway. A $2M seed round held for 18 months at 5.2% APY generates ~$186K in interest — materially extending your runway without touching the business. Arc is worth setting up alongside Mercury at this stage.
Series A ($5M–$20M raised)
Brex (or Mercury + Brex)
At Series A you have enough headcount that expense management starts mattering. Brex's integrated card, automated expense reporting, and ERP integrations save your finance team real hours. Many companies run Mercury for operations and Brex for the card program — you do not have to choose one.
Team with budget controls need
Relay
If your primary pain is allocating budget across departments or contractors — marketing gets $10K/month, paid ads get $5K, contractors get $3K — Relay's 20 sub-account structure solves this without building a full spend management stack. Best combined with Mercury or Brex for the main operating account.
The Yield Math Nobody Talks About
Most founders treat their bank account as a place to store cash. The best founders treat it as a yield-generating asset. A startup that raises $3M and holds it in a standard checking account at 0.01% APY earns $300/year. The same $3M in Mercury Treasury at 4.9% APY earns approximately $147,000/year — nearly 50 months of a junior hire at $75K fully loaded.
| Balance | Standard Checking (0.01%) | Mercury Treasury (4.9%) | Arc Treasury (5.2%) |
|---|---|---|---|
| $500K | $50/yr | $24,500/yr | $26,000/yr |
| $1M | $100/yr | $49,000/yr | $52,000/yr |
| $3M | $300/yr | $147,000/yr | $156,000/yr |
| $5M | $500/yr | $245,000/yr | $260,000/yr |
APY rates as of May 2026. Rates vary and are not guaranteed. FDIC coverage limits apply — use sweep accounts for balances above $250K.
The bank account decision is not just about fees — it is about yield, coverage, and not leaving $100K+ per year on the table.
Mercury for most. Add Arc Treasury when your balance justifies it. Move to Brex when your team does.
Track startup financial benchmarks and burn rate data on the Startup Benchmarking Dashboard at Value Add VC. Originally published in the Trace Cohen newsletter.