Vendor payment management: How to automate AP in Singapore (2026 guide)

Key takeaways:

• Automating accounts payable in Singapore can cut AP processing costs by up to 60%, according to Forrester research on AI-driven AP automation.¹

• The World Bank puts the average global cost of sending remittances at 6.26% of the amount sent.² Fintech platforms that route payments through local rails bypass correspondent bank fees entirely.

• Airwallex Bill Pay lets Singapore businesses automate the full AP cycle, from invoice capture to cross-border payment execution in 90+ currencies, with no subscription fee.

Vendor payment management covers everything your finance team does to process, approve, and settle what your business owes, from the moment a supplier invoice arrives to the point payment clears.

For Singapore businesses, that lifecycle spans both domestic rails like FAST and PayNow, and cross-border transfers to suppliers across Asia and beyond.

This guide explains how to build a vendor payment management system that handles local and international disbursements automatically, and what to look for when choosing a platform to support it.

Why manual AP processes cost Singapore businesses thousands annually

Handling vendor payments manually costs more than most finance teams account for. The drag shows up in three places: staff time, payment fees, and GST you may be leaving on the table.

Staff time adds up faster than you think

A SAP Concur survey found that most AP teams spend over 13 hours a week on manual invoice processing.³ That’s more than half a working week spent on data entry, approval chasing, and reconciliation, before you even get to exceptions and month-end close.

The cost per invoice makes this concrete. Ardent Partners puts the average cost of processing a single invoice manually at over S$13, covering data entry, routing, exception handling, and reconciliation.⁴

If your business processes 500 invoices a month, that’s over S$78,000 in annual processing overhead — not counting late fees or missed early payment discounts.

The cost difference between payment methods in Singapore

The method you use to pay a supplier changes what that payment actually costs you.

Take a S$10,000 invoice, for example.

• Pay it by credit card at a typical rate of 3.3% plus S$0.50, and the transaction costs you S$330.50 in processing fees on top of the invoice amount.⁵

• Pay the same invoice via PayNow Corporate, which runs on FAST rails and carries minimal or no per-transaction fees, and you pay close to nothing in fees.⁶

One more thing worth checking: card processing fees attract 9% GST.⁷ If you are GST-registered, you can claim this back as an input tax credit, but your records need to be clean enough to support it. Manual AP processes make that harder than it needs to be.

Navigating Singapore's domestic payment architecture

Singapore has one of the most developed domestic payment infrastructures in Southeast Asia. For finance teams managing vendor disbursements, understanding which rail to use directly affects settlement speed, cost, and reconciliation effort.

FAST, GIRO, and MEPS

These three rails handle the bulk of domestic B2B payments in Singapore. Here’s a quick overview:

FAST (Fast and Secure Transfers) settles in near real-time, 24/7. There is no transaction cap for corporate payments, and most banks charge minimal fees. It is the default choice for time-sensitive supplier payments.

GIRO (General Interbank Recurring Order) is a batch processing system that runs on scheduled clearing cycles.

Settlement typically takes one to three business days.⁸ It suits recurring, predictable payments (such as standing orders to landlords, utilities, or regular suppliers) where same-day settlement is not critical.

MEPS+ (MAS Electronic Payment System) is the high-value, same-day settlement rail operated by the Monetary Authority of Singapore. It handles large-value interbank transfers and is typically used by financial institutions rather than SMEs for day-to-day vendor payments.

PayNow Corporate

PayNow Corporate lets your business send and receive SGD payments instantly using your Unique Entity Number (UEN), without needing to share bank account details.

It runs on FAST rails, which means settlement is near-immediate and fees at most major banks are minimal or waived entirely.⁶

For local B2B payments, PayNow removes the percentage-based fees that card processing charges. If you are paying a Singapore-based supplier regularly, linking your business account to PayNow Corporate is one of the simplest ways to cut domestic AP costs.

eGIRO

Setting up a direct debit mandate with a supplier traditionally required paperwork and a waiting period of several weeks. eGIRO, introduced by the Association of Banks in Singapore, digitises that process. Corporate registration now completes in under 48 hours in most cases.⁹

For finance teams managing multiple recurring vendor payments, faster mandate setup means less lag between onboarding a new supplier and getting payments on a predictable schedule — which makes cash flow planning and reconciliation easier.

Managing cross-border vendor payments from Singapore

Singapore businesses rarely pay suppliers in SGD alone. If you source from China, Indonesia, Malaysia, or further afield, your AP process needs to handle foreign currencies efficiently.

Traditional SWIFT vs. local payout rails

When you send an international payment through a traditional bank, it typically travels through the SWIFT network via one or more correspondent banks. Each intermediary can deduct its own fee from the transfer amount, meaning your supplier may receive less than you sent.

On top of that, your bank applies an FX markup: industry research puts this at 2–5% of the transfer amount on top of the exchange rate.¹⁰ SWIFT transfers can also take two to five business days to settle.¹¹

Fintech platforms that use local payout rails work differently. Instead of routing through a chain of correspondent banks, they settle payments locally on both ends. The result is faster settlement and lower fees.

Case in point: Airwallex gives you free transfers to 120+ countries via local rails. 93% of our transfers arrive on the same day, and 45% arrive immediately.

Multi-currency wallets: avoiding double conversions

A common and avoidable cost in cross-border AP is double conversion.

For example, you might receive USD from a US customer, but your payment provider automatically converts it into SGD when it settles into your account. Later, when you need to pay a USD supplier, you convert that SGD back into USD.

The same money gets converted twice, and you pay FX fees both times.

A multi-currency wallet helps you avoid this loop. Instead of forcing everything into SGD on receipt, you can hold USD in your account and use it directly for USD expenses when they come up.

With Airwallex, you can hold 20+ currencies in one account, so incoming payments and outgoing bills can be matched in the same currency without unnecessary conversions.

FX markups: how to save up to 80% on FX fees

The rate you convert at matters as much as the fees you can see. Banks typically apply FX markups of 2–5% on cross-border conversions.¹²

In contrast, fintech platforms that route through local rails charge significantly less. Airwallex, for example, charges 0.4% on major currency pairs, letting you save up to 80% on FX fees as compared to traditional banks.

Learn more about Airwallex Transfers or sign up for an account to unlock up to 80% savings on FX fees.

ASEAN payment corridors

For Singapore businesses with suppliers across Southeast Asia, local rail availability varies by corridor but has improved significantly.

• Malaysia (MYR) and Thailand (THB) are both connected to PayNow via cross-border linkages with DuitNow and PromptPay respectively, enabling near-instant transfers.¹⁴

• Indonesia (IDR), the Philippines (PHP), and Vietnam (VND) do not yet have direct PayNow linkages, but fintech platforms with local payout networks can still route payments through in-country rails rather than SWIFT.

How to automate vendor payments: A step-by-step guide

Automating your accounts payable process does not require replacing your accounting software or overhauling your finance team. It means connecting the right tools to handle each stage of the invoice lifecycle, from the moment a bill arrives to the point it clears your bank.

Here is how a modern AP automation system works in practice:

Step 1: Capture and digitise invoices with AI OCR

When a supplier sends an invoice, the system reads it automatically using optical character recognition (OCR). It extracts the supplier name, invoice number, amount, due date, and line items — without anyone keying data in manually.

Modern OCR handles invoices in multiple languages and formats, which matters if your suppliers send documents in Mandarin, Bahasa Indonesia, Thai, or Vietnamese.

Granular line-item extraction also keeps your records IRAS audit-ready and aligned with PINT-SG requirements for InvoiceNow compliance.

Step 2: Automated three-way matching

Once captured, the system matches the invoice against the corresponding purchase order and goods receipt. If the numbers line up, the invoice moves forward automatically. If they do not, it gets flagged for review.

This catches duplicate invoices before they reach payment and reduces the risk of paying for goods or services that were never received.

Step 3: Rule-based approval routing

Not every invoice needs the same approval chain.

You set the rules. For example: auto-approve invoices below S$500, require a single approver between S$500 and S$5,000, require dual approval above S$5,000. The system routes each invoice accordingly and sends mobile notifications to approvers.

The result is a shorter approval cycle.

Step 4: Straight-through payment execution across local and global rails

Once approved, payments go out automatically. Domestic vendors are paid via FAST, GIRO, or PayNow. International vendors are paid through local payout rails where available, avoiding SWIFT fees entirely.

Airwallex Bill Pay supports batch processing, so you can execute payments to dozens of vendors across multiple currencies in a single run — all from one dashboard, with real-time status tracking per vendor.¹⁵

Step 5: Real-time reconciliation and ERP sync

After payment, the system matches each transaction back to the corresponding invoice and pushes the data to your accounting software. Bills, payments, and reconciliation entries sync automatically to Xero, QuickBooks, or NetSuite — in both directions.

Your books stay current without manual exports or re-keying. For more on how this fits into a broader AP automation strategy, see our guide to accounts payable automation.

Comparing vendor payment management platforms in Singapore

Several platforms handle vendor payment management in Singapore, each with different strengths on local rails, FX pricing, and ERP integrations.

For a detailed side-by-side across nine options, see our guide to the best accounts payable software in Singapore.

Regulatory compliance and government funding

Four areas matter for Singapore finance teams managing vendor payments: MAS licensing, InvoiceNow, Section 45 withholding tax, and PSG funding.

Payment Services Act: check your provider is licensed

Any platform that executes payments on your behalf must hold a Major Payment Institution licence from MAS. Licensed providers are required to hold client funds in segregated accounts; those funds cannot be lent out or commingled with the provider's own capital.¹¹

Before committing to an AP platform, verify its licence on the MAS Financial Institutions Directory.

GST InvoiceNow: staged deadlines by revenue tier

InvoiceNow is Singapore's Peppol-based e-invoicing network. GST-registered businesses must transmit invoice data directly to IRAS via an accredited solution, rolling out in phases:¹⁹

IRAS will notify pre-2026 registrants of their specific deadline by mid-2026.

Section 45 withholding tax: Payments to non-resident vendors

If you pay a non-resident vendor for services, royalties, interest, or management fees, you may need to withhold tax before releasing payment. The obligation falls on you as the payer.²⁰

Key rates in the absence of a Double Tax Agreement:

• Service fees (work performed in Singapore): 17%

• Royalties: 10% for now, being phased out from YA 2027

• Interest: 15%

File and pay via myTax Portal by the 15th of the second month after the payment date. Missing the deadline triggers an automatic 5% late penalty.¹³

Note: Section 45 does not apply to payments for goods, dividends, or services performed entirely outside Singapore.

Productivity Solutions Grant: Up to 50% co-funding for AP automation

PSG co-funds up to 50% of qualifying costs for pre-approved AP automation solutions, capped at S$30,000 per year.¹⁴ Your business must be Singapore-registered, have at least 30% local shareholding, and have group turnover under S$100 million or fewer than 200 employees.

One rule catches most rejections: do not pay the vendor or sign any contract before your grant is approved.²¹

For InvoiceNow adoption, SMEs with annual supplies up to S$4 million can also claim up to S$1,000 via a separate transition grant, disbursed via PayNow Corporate. Larger businesses can claim up to S$5,000.¹²

Why Singapore businesses choose Airwallex for vendor payment management

Most AP platforms solve one part of the problem. They handle invoice capture, or approval workflows, or cross-border payments — but rarely all three in a way that works for a Singapore business paying suppliers across multiple markets.

In contrast, Airwallex Bill Pay covers the full cycle in one place: invoice capture via OCR, rule-based approval workflows, payment execution across local and global rails, and two-way ERP sync. There is no subscription fee; you pay per transaction.

Here’s what you get with Airwallex Bill Pay:

• Invoice capture: Upload or email a bill and OCR extracts the supplier name, amount, line items, and due date automatically.

• Approval workflows: Set rules by amount, currency, or vendor.

• Payment execution: Pay domestic vendors via FAST, GIRO, or PayNow. Pay overseas suppliers in 90+ currencies, with no SWIFT fees on local rails.

• ERP sync: Bills, payments, and reconciliation entries push automatically to Xero, QuickBooks, or NetSuite in both directions.

• Single dashboard: AP, corporate cards, and expense management sit in one platform, so your finance team has a real-time view of all company spend in one place.

Love, Bonito, a Singapore-headquartered womenswear brand, switched to Airwallex to manage their overseas supplier payments. With Airwallex, the brand now saves around 25% on cross-border transfer fees, with 95% of payments arriving the same day.

Frequently asked questions (FAQs)

What is the most cost-effective way to pay international suppliers from Singapore?

Use a platform that routes payments through local rails rather than SWIFT. Local rail transfers to markets like the US, EU, China, Malaysia, and Thailand avoid correspondent bank fees and typically settle faster. Fintech platforms generally offer better FX markups. For example, Airwallex charges 0.4% to 0.6% above interbank, letting you save up to 80% on FX fees.

Is my money safe with a non-bank payment provider in Singapore?

MAS-licensed Major Payment Institutions are required to hold client funds in segregated accounts at approved financial institutions. Those funds cannot be lent out. Check any provider's licence status on the MAS Financial Institutions Directory before signing up.

Does my business qualify for the GST InvoiceNow Transition Grant?

If your business is GST-registered with annual supplies of S$4 million or less, you can claim up to S$1,000 after successfully transmitting invoice data to IRAS via an accredited solution. Larger businesses can claim up to S$5,000.¹⁹

How does eGIRO speed up accounts payable reconciliation?

Traditional GIRO mandate setup required paper forms and could take up to 21 working days. eGIRO completes the process digitally in under 48 hours for corporate accounts.⁹ That means recurring vendor payment arrangements are active faster, reducing gaps in your AP schedule.

What are the PSG-approved accounts payable automation tools in Singapore?

PSG-approved AP solutions are listed on the GoBusiness Tech Depot. Xero and QuickBooks are both on the approved list. Check the Tech Depot directly for the current list, as it is updated periodically and tool eligibility can change.

What triggers Section 45 withholding tax on vendor payments?

Section 45 applies when you pay a non-resident vendor for services performed in Singapore, royalties, interest, or management fees. It does not apply to payments for goods or services performed entirely outside Singapore. File and pay via myTax Portal by the 15th of the second month after the payment date.¹³

Sources:

1. https://www.highradius.com/resources/Blog/accounts-payable-transformation/

2. https://diversification.com/term/international-wire-transfer

3. https://blog.symtrax.com/why-manual-invoice-processing-is-costing-your-business-more-than-you-think/

4. https://www.bottomline.com/resources/the-cost-of-manual-accounts-payable

5. https://www.airwallex.com/en-sg/blog/wise-vs-airwallex

6. https://www.mas.gov.sg/news/parliamentary-replies/2025/written-reply-on-paynow-surcharges

7. https://www.iras.gov.sg/taxes/goods-services-tax-(gst)/gst-rates

8. https://razorpay.com/sg/blog/what-is-giro-in-singapore-a-guide-to-automated-business-payments/

9. https://aspireapp.com/blog/a-comprehensive-guide-to-giro-payments-and-transfers-in-singapore

10. https://bancoli.com/blog/fx-markup

11. https://www.mas.gov.sg/regulation/payments/payment-service-providers

12. https://www.iras.gov.sg/news-events/newsroom/committee-of-supply-2026--extension-of-gst-invoicenow-requirement-to-all-gst-registered-businesses-by-april-2031

13. https://www.iras.gov.sg/taxes/withholding-tax/payments-to-non-resident-company/payments-that-are-subject-to-withholding-tax

14. https://www.enterprisesg.gov.sg/financial-support/productivity-solutions-grant

This publication does not constitute legal, tax, or professional advice from Airwallex, nor does it substitute seeking such advice, and makes no express or implied representations / warranties / guarantees regarding content accuracy, completeness, or currency. If you would like to request an update, feel free to contact us at [[email protected]]. Airwallex (Singapore) Pte. Ltd. (201626561Z) is licensed as a Major Payment Institution and regulated by the Monetary Authority of Singapore.