What's the difference between FedNow, RTP, and ACH?

FedNow is the Federal Reserve's instant payment rail (launched 2023, settles in <20 sec, 24/7). RTP (Real-Time Payments) is The Clearing House's instant rail (launched 2017 by big banks, also <20 sec settlement). ACH (Automated Clearing House) is the legacy batch rail (1970s, 1-3 business day settlement, banker's hours). FedNow and RTP do NOT interoperate yet — both banks must be on the same network for instant settlement to work. ACH is universal across all US banks.

FedNow vs RTP — which one should I pick for my business?

You don't pick — your bank does, behind the scenes. Most large banks (Chase, Wells, Citi, US Bank) support BOTH defensively, and the bank's routing logic chooses based on the receiving bank's capabilities. For small businesses: pick a bank that supports BOTH rails (most major banks do by 2026), then stop worrying about which rail any specific transaction uses. The user experience is identical.

When should I use ACH instead of an instant rail?

ACH still wins when: (1) you're doing payroll — most payroll providers (Gusto, ADP, Rippling) haven't moved off ACH, and the 2-3 day settlement is fine. (2) Recurring batched payments where speed doesn't matter. (3) Cost matters more than speed (ACH is cheaper per transaction). (4) You need pull-based debit (vendor pulls from your account) — both FedNow and RTP are push-only. (5) Both parties haven't confirmed instant-rail enablement.

Is RTP being replaced by FedNow?

No — both rails are growing in parallel. RTP has bigger initial coverage (launched 6 years earlier, dominated by big banks). FedNow has Fed backing (more political/regulatory durability) and faster small-bank adoption (1,400+ participating banks by mid-2026). Most banks now support BOTH rails defensively. The two networks may eventually interoperate, but as of 2026, no announced timeline.

Which payment rail is cheapest for small business?

ACH is still the cheapest per-transaction ($0.20-1.50 send, $0.20-1.00 receive). FedNow and RTP are 2-5x more expensive per transaction but settle in seconds vs 1-3 days. The decision isn't 'which rail is cheapest' — it's 'is the cash-flow speed worth the per-transaction cost premium for THIS use case'. For payroll: ACH wins (volume + speed not critical). For receivables from clients you want paid faster: FedNow/RTP wins (cash-flow value > $2-5 per transaction).

Does Stripe support FedNow and RTP for instant payouts?

Stripe added FedNow as a payout option in 2024 (free for Standard accounts and above, opt in via Dashboard → Payouts → Schedule). RTP support is more limited — Stripe routes some instant payouts through Visa Direct (1% fee on top of regular processing) instead of RTP. If instant payouts matter to your business, FedNow is the cheaper Stripe path in 2026. Square uses Visa Direct (1.75% fee), not FedNow or RTP. Shopify Payments has FedNow on the 2026 roadmap but not yet shipped.

What's the maximum transaction limit on FedNow vs RTP vs ACH?

FedNow: $1M per transaction (raised from $500K in 2024). RTP: $1M per transaction (raised from $100K in 2022). ACH: technically no per-transaction limit, but most banks set $10K-1M caps for risk reasons. Wire transfer (separate rail): no practical cap, used for $1M+ transfers. For $1M+ payments: still wire or split into multiple instant payments.

Can I refund or reverse an instant payment on FedNow or RTP?

No — both FedNow and RTP are push-only and final on settlement. There's no chargeback, no reversal, no recall. If you sent to the wrong account, you can ASK the receiver to send it back, but you cannot force it. ACH has 60-day reversal windows for unauthorized transactions. This irreversibility is why instant rails are best for trusted B2B (paying known vendors) and worse for first-time strangers (where chargeback protection matters).

⚡ Payment Rails · Operator Comparison

FedNow vs RTP vs ACH (2026): Which Payment Rail Should Your Small Business Actually Use?

Q: FedNow vs RTP — which one should I pick for my business?

You don't pick — your bank does, behind the scenes. Most large banks (Chase, Wells, Citi, US Bank) support BOTH defensively, and the bank's routing logic chooses based on the receiving bank's capabilities. For small businesses: pick a bank that supports BOTH rails (most major banks do by 2026), then stop worrying about which rail any specific transaction uses. The user experience is identical.

Q: When should I use ACH instead of an instant rail?

ACH still wins when: (1) you're doing payroll — most payroll providers (Gusto, ADP, Rippling) haven't moved off ACH, and the 2-3 day settlement is fine. (2) Recurring batched payments where speed doesn't matter. (3) Cost matters more than speed (ACH is cheaper per transaction). (4) You need pull-based debit (vendor pulls from your account) — both FedNow and RTP are push-only. (5) Both parties haven't confirmed instant-rail enablement.

Q: Is RTP being replaced by FedNow?

No — both rails are growing in parallel. RTP has bigger initial coverage (launched 6 years earlier, dominated by big banks). FedNow has Fed backing (more political/regulatory durability) and faster small-bank adoption (1,400+ participating banks by mid-2026). Most banks now support BOTH rails defensively. The two networks may eventually interoperate, but as of 2026, no announced timeline.

Q: Which payment rail is cheapest for small business?

ACH is still the cheapest per-transaction ($0.20-1.50 send, $0.20-1.00 receive). FedNow and RTP are 2-5x more expensive per transaction but settle in seconds vs 1-3 days. The decision isn't 'which rail is cheapest' — it's 'is the cash-flow speed worth the per-transaction cost premium for THIS use case'. For payroll: ACH wins (volume + speed not critical). For receivables from clients you want paid faster: FedNow/RTP wins (cash-flow value > $2-5 per transaction).

Three US payment rails. Two of them are instant. One is universal but slow. They don't all interoperate. Here's the head-to-head — when each one wins, when each one loses, and why most small businesses don't actually pick (their bank does it for them).

📅 Last reviewed: 2026-05-06. Coverage + per-transaction limits + bank participation verified against the Federal Reserve + The Clearing House live participant directories this week. Companion: FedNow for small business — honest setup guide →

Quick Answer (60-second read)

FedNow: Fed-operated instant rail. Settles in <20 sec, 24/7/365. 1,400+ banks (mid-2026). Push-only, irrevocable. $1M per-transaction limit.
RTP: Bank-consortium instant rail (The Clearing House). Settles in <20 sec, 24/7. Larger initial coverage at big banks. Push-only, irrevocable. $1M limit.
ACH: Legacy batch rail (1970s). 1-3 business day settlement, banker's hours. Universal across all US banks. Reversible up to 60 days. Cheapest per transaction.
FedNow ↔ RTP: Don't interoperate yet. Both banks must be on the same instant network. Most large banks support BOTH defensively.
You don't pick — your bank does, behind the scenes, based on the receiver's capabilities.
Confused? Text PJ at 858-461-8054. Most "which rail" decisions get answered in one text exchange.

The three rails at a glance

Dimension	FedNow	RTP	ACH
Operator	Federal Reserve	The Clearing House (bank consortium)	NACHA (industry org)
Launched	July 2023	November 2017	1970s
Settlement time	< 20 seconds	< 20 seconds	1–3 business days
Operating hours	24/7/365	24/7/365	Business hours, weekdays
Per-transaction limit	$1M	$1M	$1M+ (bank-set)
Bank coverage (2026)	1,400+ banks	~600 banks (big-bank dominant)	All US banks (universal)
Cost (receive)	$0–2	$0–2	$0.20–1.00
Cost (send)	$0.50–5	$0.50–5	$0.20–1.50
Reversibility	Push only — final + irrevocable	Push only — final + irrevocable	60-day unauthorized reversal
Interop with the others	No (yet)	No (yet)	Universal

When each rail wins

⚡ FedNow wins when

Fed-aligned operations + bank flexibility

You bank with a small/regional bank (faster FedNow adoption than RTP)
Receiving from federal disbursements (some IRS/SBA flows route FedNow first)
Future-proofing for the rail with the most regulatory backing
Cross-bank receivables where small banks are the receiver

⚡ RTP wins when

Big-bank-to-big-bank flows

Both you and your counterparty bank with Chase/Wells/Citi/BofA
You're already integrated with TCH's Real-Time Payments (legacy)
Your payment processor (Stripe/Plaid) defaults to RTP for your account
You need the most established instant rail (6 years more production data)

📅 ACH wins when

Speed isn't the bottleneck

Payroll (Gusto/ADP/Rippling all default ACH)
Recurring batched payments (subscriptions, vendor payments)
You need pull-based debit (vendor pulls from your account)
Cost is the dominant constraint (cheapest per transaction)
Counterparty is on a tiny credit union not yet on instant rails

The actual decision framework

For most small businesses, the question isn't "which rail" — it's "is this transaction worth the cost premium for instant settlement?" Three lenses:

1. Cash-flow value of receiving in seconds vs days. If you're a contractor waiting on a $10K client payment, getting it in 20 seconds vs 3 days is worth $2-5 in extra fees easily. Your cash conversion cycle just collapsed by 99%.

2. Counterparty trust. Instant rails are irrevocable. If you're paying a known vendor for an invoice you've vetted, instant is fine. If you're paying a stranger on the internet, the 60-day ACH reversal window is real protection.

3. Volume and operational cadence. One-off high-stakes payment: instant rail. Batched recurring at scale (payroll, subscriptions): ACH. Low-volume B2B receivables: instant if your customers' banks support it.

Trying to decide which rail for a specific use case?

Text the use case (e.g. "client invoices $5-50K, currently 3-day ACH, want faster"). Most rail-selection questions get answered in one text exchange. No funnel either way — just operator-translation in plain English.

Text PJ · 858-461-8054