RTGS Explained: How CHATS, FPS & SWIFT Work in HK

Moving money in Hong Kong doesn't have to be a guessing game between CHATS, FPS, and RTGS. Whether you're making a high-stakes property down payment or just splitting a dinner bill, choosing the right transfer method is the key to avoiding hidden fees and unnecessary delays.

This guide breaks down how Hong Kong's financial plumbing works, comparing speed, costs, and limits to help you move your funds with total confidence.

What Is RTGS (Real-Time Gross Settlement)?

RTGS (Real-Time Gross Settlement) is one of the core infrastructural components of the modern banking system. To understand its importance, it helps to break down the term literally.

1. Real-time — transfer instructions are processed immediately upon receipt without any waiting period, unlike traditional batch processing.
2. Gross — each transaction is settled individually. It is not bundled with other transactions or subjected to "netting" (totalling all receivables and subtracting payables).
3. Settlement — the settlement is final and irrevocable. Once funds are credited to the receiving bank's account, the transaction is considered complete.

Why the Banking System Needs RTGS

The banking system needs RTGS for 3 primary reasons.

1. Safety. Traditional netting systems carry "settlement risk" — if a bank fails before the end of the day and cannot pay its debts, it could trigger a domino effect, leading to a collapse across the wider financial system. RTGS settles transaction by transaction in real time, so once funds arrive, the settlement is final, eliminating this credit risk.
2. Immediacy. For high-value or time-sensitive transactions — financial market trades, real estate — RTGS ensures that funds move from 1 party to another almost instantly.
3. Handling large transactions. RTGS systems are specifically designed to handle large-value payments between banks, large corporations, and financial institutions, typically without a low maximum limit.

A Concrete Example of the Risk RTGS Solves

Imagine 2 banks exchange HKD 500 million in payments throughout the day under a net settlement system, planning to settle only the difference at 5pm.

If 1 bank becomes insolvent at 4pm, before that final settlement happens, the other bank could be left holding payments it already processed in good faith, with no guarantee of receiving what it's owed.

Under RTGS, this scenario simply can't occur in the same way. Each of those payments would have already settled individually and irrevocably throughout the day, so a bank failure late in the day doesn't unwind transactions that already cleared.

This is precisely why large-value, systemically important payments now run through RTGS almost everywhere in the world.

Gross Settlement vs Net Settlement

To understand why RTGS matters, it helps to understand what it replaced.

Before RTGS became standard, most interbank payment systems used net settlement (also called Deferred Net Settlement, or DNS) — batching transactions together throughout the day and settling only the net difference between banks at a fixed cut-off point, often once or a few times daily.

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Net settlement isn't obsolete — it's still used for high-volume, lower-value payments where processing efficiency matters more than instant finality. RTGS exists specifically for the payments where waiting for a batch cycle, and the settlement risk that comes with it, isn't acceptable.

Who Operates RTGS Systems?

RTGS systems are almost always operated by, or under the direct oversight of, a jurisdiction's central bank or monetary authority. This isn't incidental — settling large-value interbank payments is considered core financial infrastructure, comparable to a country's currency itself, which is why central banks rather than private companies typically run or closely supervise these systems.

Most major economies operate their own RTGS system, each with its own name: Fedwire in the United States, CHAPS in the United Kingdom, TARGET2 across the eurozone, and CHATS here in Hong Kong.

The underlying principle — real-time, gross, final settlement — is the same across all of them, even though the specific rules, operating hours, and participating institutions differ by jurisdiction.

RTGS vs CHATS: Two of Hong Kong's Real-Time Payment Systems

So what's the relationship between RTGS and "CHATS," which you'll often hear about locally?

Simply put, RTGS is an international systemic concept and standard, while CHATS is the specific name of the RTGS system implemented in Hong Kong. CHATS (Clearing House Automated Transfer System) is the local RTGS system operated by Hong Kong Interbank Clearing Limited (HKICL) and regulated by the Hong Kong Monetary Authority (HKMA).

In Hong Kong, when you need to make a large local transfer — a property down payment, a large corporate invoice — the system you use is CHATS. It supports real-time settlement for 4 currencies: HKD, USD, RMB, and EUR.

Comparing Hong Kong's 3 Major Transfer Systems: CHATS vs FPS vs SWIFT

After understanding CHATS (RTGS), it's worth comparing the 3 most common transfer methods used in Hong Kong side by side.

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Local Transfers: Should You Choose CHATS or FPS?

For local transfers in Hong Kong, the choice mainly comes down to CHATS or FPS.

When You Must Use CHATS

Despite the convenience of FPS, you must use CHATS — your bank's "Local Transfer" or "Transfer to Other Bank" function, rather than "FPS" — in the following scenarios.

1. Your transfer amount exceeds your bank's daily FPS limit. For example, if you need to pay a HKD 3,000,000 property deposit but your FPS limit is only HKD 1,000,000, you must use CHATS.
2. You're making a local interbank foreign currency transfer. This is a common misconception — FPS only supports HKD and RMB. If you want to transfer USD from Bank A to a USD account at Bank B (for example, to earn higher interest on a fixed deposit), you must use CHATS.

When You Should Use FPS

1. Daily small payments. For almost all everyday payments — splitting dinner bills, online shopping, paying rent or tuition — prioritise FPS as long as the amount is within your limit.
2. You need a 24/7 instant transfer. If you need to send money urgently during weekends, public holidays, or after bank cut-off times, FPS is your only option, since CHATS only operates on banking business days.

For businesses specifically wanting to receive customer payments via FPS, our guide on setting up business FPS covers the process, and our guide on cross-border FPS between Hong Kong and China covers the specific mechanics for that corridor.

How to Make a Local CHATS Transfer: Online Banking Steps

Steps to use CHATS vary slightly by bank, but the general process is similar across providers.

1. Log in to online banking — access your personal or business account.
2. Select the correct transfer type. Look for "Transfer" or "Payment," and do not select "FPS." Choose "Transfer to other local bank" or a similar option.
3. Enter recipient details — the recipient's bank name, bank code (e.g. 004), full account number, and account name.
4. Select currency and amount — choose HKD, USD, EUR, or CNY, and enter the amount.
5. Select the processing method. The system may let you choose between "CHATS" (immediate processing) or "Electronic Clearing (ECG)" (1 to 2 days, lower or no fee). For instant arrival, select CHATS specifically.
6. Confirm and submit — double-check all details, enter your security code (e.g. OTP), and confirm.
7. Note the cut-off time. Complete the transaction before your bank's CHATS cut-off time, or the funds will be processed the next working day.

Why a Multi-Currency Account Changes Both Local and International Payments

So far, this guide has covered CHATS, FPS, and SWIFT as separate systems you choose between transaction by transaction. A multi-currency account (MCA) changes that picture.

It lets a business hold, send, and receive several currencies from 1 account structure, reducing how often you need to think about which system to use at all.

For Local Payments

An MCA doesn't replace CHATS or FPS locally — it sits on top of them. A Hong Kong business holding HKD in a multi-currency account still uses FPS for everyday small payments and CHATS for larger local transfers, exactly as covered earlier in this guide.

What changes is that the same account also holds other currencies alongside HKD, so a business isn't forced into a separate local-only account just to manage its home-currency operations.

For International Payments

This is where an MCA meaningfully changes the picture covered earlier around SWIFT. Rather than converting to a foreign currency and sending every international payment through the SWIFT correspondent banking chain, an MCA lets a business hold foreign currency balances directly, and often send payments through local payment rails in the destination country instead.

A payment to a US supplier, for example, can settle through the US's own domestic payment network rather than travelling through SWIFT and its intermediary banks at all, provided the account provider has the infrastructure to connect to that network directly.

This avoids the correspondent bank fees and multi-day settlement times that make traditional SWIFT transfers slower and more expensive.

Receiving international payments works the same way in reverse. Instead of a client sending funds via SWIFT into a single HKD account, an MCA can provide local receiving details in the client's own currency, letting them pay as if paying a local recipient in their own country.

Our guide on multi-currency accounts for Hong Kong businesses covers the full comparison of providers, fees, and features in depth.

Overview of Major Bank Transfer Fees

Fees are a major consideration when choosing between these systems. Here's a comparison of major Hong Kong banks based on published rates — always confirm current fees with your bank before transacting, since these change over time and vary by account tier.

Local CHATS Fee Comparison

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These figures reflect published rates for local CHATS transfers and may vary by account tier. For international payment costs specifically, the fee structure looks quite different depending on whether you route through SWIFT or a local-rail multi-currency account — our guide on multi-currency accounts for Hong Kong businesses breaks this down with real provider comparisons.

How to Save on Transfer Fees

A handful of practical habits meaningfully reduce what you pay across CHATS, FPS, and SWIFT.

1. Prioritise online banking over branches. As the tables above show, branch processing fees are often several times higher than online banking.
2. Use FPS for small transfers. All local HKD and RMB small-value transfers should go through FPS, which is typically free.
3. Choose a higher account tier for fee waivers. If you frequently make SWIFT or local foreign currency transfers, a priority banking tier (e.g. HSBC Premier, Citi Gold) often waives CHATS and SWIFT fees despite requiring a minimum balance — worth it if the volume justifies it.
4. Consider a local transfer network for international payments, which can bypass the correspondent bank fees that make SWIFT expensive in the first place, covered further below.

Common Mistakes People Make With These Systems

A few recurring errors show up regularly when businesses and individuals choose between CHATS, FPS, and SWIFT.

1. Selecting FPS for foreign currency transfers. Since FPS only supports HKD and RMB, this fails outright — CHATS is required for other currencies, even between 2 Hong Kong accounts.
2. Missing the CHATS cut-off time. Submitting a transfer even a few minutes late pushes settlement to the next working day, which matters for time-sensitive payments like property deposits.
3. Assuming SWIFT is the only option for international payments. Some providers now route payments through local networks in the destination country instead, avoiding SWIFT's intermediary chain entirely.
4. Not accounting for correspondent bank fees when budgeting a SWIFT payment. These are deducted from the principal along the route, meaning the recipient can receive noticeably less than what was sent.

Why Hong Kong Businesses Choose Aspire

Understanding CHATS, FPS, and SWIFT is one part of moving money confidently — Aspire is built to make the international side just as efficient.

💱 FX spreads from 0.18%, up to 3x cheaper than traditional banks. This applies across 130+ countries and 40+ currencies through Aspire's multi-currency account. It's useful for anything from paying overseas suppliers to settling international payments without losing margin to markup.

💰 1.2% unlimited cashback applies on every corporate card transaction, with no monthly cap. It kicks in automatically on eligible spend, with no minimum threshold to hit first. Over time, it quietly turns routine business spend into working capital.

🌐 Local transfer network, not multi-hop SWIFT chains, is how Aspire routes most payments. This means faster settlement and fewer intermediary fees eating into your payment before it reaches the recipient. It also reduces the chance of funds being held up for review at a correspondent bank along the way.

💸 Fixed USD 8 inbound SWIFT fee, tracked end-to-end with SWIFT GPI, applies when SWIFT is the right rail for your payment. There are no surprise deductions from correspondent banks along the way, so the amount you're quoted is the amount that arrives. You can also download payment confirmation instantly from the app, without calling the bank.

⚡ Approved in as little as 1 business day, with no branch visits and no paperwork stacks. Applications are completed entirely online, from document upload to approval. There's no waiting weeks on a relationship manager to call you back.

Open a free multi-currency business account built for Hong Kong SMEs, or explore how Aspire's corporate card fits into your day-to-day spend.

Frequently Asked Questions

What's the difference between RTGS and CHATS?

RTGS is the international systemic concept, while CHATS is the specific RTGS system implemented in Hong Kong, operated by Hong Kong Interbank Clearing Limited and regulated by the HKMA.

Can I use FPS to send USD?

No. FPS only supports HKD and RMB. Transferring USD or other foreign currencies between Hong Kong bank accounts requires CHATS instead.

Why did my CHATS transfer not arrive the same day?

This is usually because the transfer was submitted after your bank's CHATS cut-off time, typically around 5:00pm to 5:30pm on business days, pushing settlement to the next working day.

Can a multi-currency account replace CHATS or FPS for local payments?

No, not entirely. A multi-currency account typically still uses FPS and CHATS for local HKD payments — its main advantage is holding multiple currencies in the same account and routing international payments more efficiently.

How does a multi-currency account make international payments cheaper?

By holding foreign currency directly and routing payments through local payment networks in the destination country where possible, rather than converting through SWIFT's correspondent banking chain on every transaction.