Recurring billing for maintenance contracts in Singapore: cost in 2026

The verdict in three sentences

For an HVAC contractor in Singapore managing 3,200 servicing contracts billed monthly and annually, the real cost of manual billing lies in forgotten price revisions, wrong proration and customers paying in 50 days. Stripe Billing charges 0.7% of billed volume on top of card fees of about 3.4% plus 0.50 SGD, a billing platform such as Chargebee starts at a few hundred USD per month, and a custom module tied to your ERP costs 17,000 to 40,000 USD with very low GIRO bank fees afterwards. Over 3 years the choice depends on how you collect (cards or GIRO) and on InvoiceNow e-invoicing readiness, with a 2 to 4 month timeline.

What maintenance contract billing has to automate

An aircon or chiller servicing contract is not a software subscription. It starts mid-month, changes plan after an equipment replacement, gets an annual price revision and ends with a notice period. On the compliance side, IRAS is phasing in InvoiceNow (the Peppol e-invoicing network) for GST reporting from November 2025, starting with new voluntary GST registrants, and established GST-registered firms should plan for it. Your billing tool must therefore produce invoices in the right format with 9% GST and send them through an access point.

3-year simulation for 3,200 contracts

Assumptions: 1,900 monthly contracts at 37 USD and 1,300 annual contracts at 540 USD, or 1,545,600 USD billed per year and 24,100 collections. Figures are 2026 estimates in USD, before negotiated rates.

Card-based billing is very expensive at this volume in Singapore. A billing platform with PayNow invoices is the cheapest on paper, but customers still choose when to pay, so the cash benefit is smaller. The custom GIRO module costs a little more over 3 years and is the only option that both pulls payments automatically and keeps revision rules and InvoiceNow inside the ERP.

Mini case study

Wei Ling, CFO of an HVAC contractor in Singapore, sees two admin staff each spending 3 days a month on revisions, proration and reminders, or 72 days a year. Customers pay on average in 52 days.

• Admin time: 72 days x 7 h x 35 USD fully loaded = 17,640 USD per year, 75% of it recoverable with automatic debit.
• Payment delay: from 52 to 18 days with GIRO, or 1,545,600 USD / 365 x 34 days = 144,000 USD of cash freed.
• Late revision: a 3.5% increase applied 2 months late on 40% of contracts costs about 3,600 USD a year.
• Investment: custom module at 28,000 USD, then 12,730 USD a year all-in.

Against card billing, the custom module saves about 59,800 USD a year from year one. Against the PayNow platform it costs about 17,700 USD more over 3 years, which faster collection easily offsets: 34 fewer days of payment delay on 1.5 M USD is worth about 144,000 USD of working capital.

FAQ

Is GIRO suitable for business customers?

Yes, most Singapore companies already pay utilities and suppliers by GIRO, and eGIRO lets customers sign the mandate online in minutes. Rejection rates usually stay around 1 to 2%, against 5 to 8% late payments on manual transfers.

Does Stripe Billing handle annual price revisions?

It handles subscription price changes, but not an indexed formula specific to your trade. You compute it in the ERP or via a script, adding 2,300 to 5,700 USD of integration.

Do we need InvoiceNow now?

It depends on your GST status: new voluntary registrants are already in scope since late 2025, and IRAS plans to extend it. Including the access point connector in the billing project avoids paying for two integrations.

How long does an eGIRO mandate take?

With eGIRO, approval takes a few days instead of 2 to 3 weeks for paper forms. An email campaign with a signing link usually gets 60 to 75% of mandates signed within a month.

How long to migrate 3,200 contracts?

Plan 2 to 4 months, including 4 to 6 weeks of mandate collection. Annual contracts can switch at renewal to spread the workload.

Let's scope your project. We frame your recurring billing (contracts, revisions, proration, GIRO, InvoiceNow) with an indicative budget and a mandate migration plan. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.