Glossary · Banking
What is ACH (Automated Clearing House)?
The US bank-to-bank electronic transfer network. Slow (1–3 business days) but free or very cheap; the underlying rail for direct deposit, bill pay, Venmo cashouts, and most non-card US digital payments.
Last updated April 30, 2026
How it works
ACH is operated by the National Automated Clearing House Association (Nacha) and runs as batches throughout the business day. When you initiate an ACH transfer:
- Your bank packages the request with hundreds of others into a batch
- Batch goes to an ACH operator (Federal Reserve or The Clearing House)
- The receiving bank gets the batch, processes credits/debits
- Settlement happens 1–3 business days later
Two flavors:
- ACH Credit (push) — you tell your bank "send $X to that account." Used for direct deposit (employer pushes salary to you), Zelle, paying bills.
- ACH Debit (pull) — you authorize someone to pull from your account. Used for autopay (utility bill pulls from you), Venmo cashouts, brokerage bank-link funding.
Same-Day ACH was introduced in 2016 and now handles a meaningful share of urgent payments — settlement within hours instead of days, with a small fee.
Example
Common ACH-routed flows:
| Flow | Direction | Typical settlement |
|---|---|---|
| Salary direct deposit | Employer → you | 1–2 business days |
| Coinbase USD deposit | Your bank → Coinbase | 4–5 business days (security holds) |
| Coinbase USD withdrawal | Coinbase → your bank | 1–3 business days |
| Venmo cashout to bank | Venmo → your bank | 1–3 business days (free) or instant for 1.75% fee |
| Pay your electricity bill | Utility pulls from your bank | Same day (debit) |
| Send money via Zelle | Bank → bank via Zelle network | Minutes (Zelle is built on enhanced ACH-style rails) |
Crypto exchanges introduce extra delays beyond the ACH itself — Coinbase puts a 4-day hold on first deposits to defend against fraud and reverse charges. Withdrawals are usually the standard 1–3 days.
Why it matters
ACH is the workhorse of US digital banking — most "free transfer" experiences run on it under the hood:
- Why crypto deposits take days. ACH is reversible for ~60 days under Reg E; exchanges hold funds during that window in case the originating bank yanks the transfer back.
- Why wire transfers exist. Wires settle same-day and are irreversible — that's what costs $25–50. For amounts above ~$10k or time-sensitive transfers, the fee is worth it.
- Why Zelle and Venmo feel instant. They're crediting your in-app balance immediately while ACH settlement happens in the background. The "instant" cashout to bank is them fronting you the money in exchange for a fee (typically 1.75%).
- No protection equivalent for crypto. Once a crypto transaction confirms, it's irreversible. ACH's reversibility is what enables the "I sent it to the wrong person" recovery path that doesn't exist on-chain.
Practical points:
- For routine bank transfers, free ACH is fine. Don't pay $25 for a wire if you can wait two days.
- For first crypto exchange deposit, expect 4-7 day hold. Subsequent deposits may settle faster as the relationship matures.
- Wires for >$10k transfers are usually worth the fee — irreversibility cuts the risk window for both sides.
- FedNow (US instant-payment system launched 2023) is an emerging alternative to ACH for instant settlement, but adoption is still partial.