The verdict in three sentences
In a group of 5 companies and 650 employees, re-keying payroll journal entries and their cost center allocations into the ERP every month ties up about 2 days of accounting time and creates posting errors nobody spots before month-end close. A custom payroll to ERP connector costs between 20,000 and 50,000 SGD in Singapore in 2026, is delivered in 6 to 10 weeks and costs 300 to 800 SGD per month to maintain. Payback is fast when the group has several entities, several cost center structures and intercompany recharges.
Why re-keying payroll costs more than you think
In Singapore, many regional groups have stacked their tools: an outsourced or in-house payroll system, an ERP for accounting, sometimes a spreadsheet for allocation keys. Every month, the finance manager exports a payroll journal, reworks it, then keys it in or imports it by hand into each entity.
| Item (2026 order of magnitude) | Manual re-entry | Semi-automated file import | Custom API connector |
|---|---|---|---|
| Monthly time for 5 entities | 2 days (16 h) | 6 to 8 h | Under 1 h of review |
| Cost center posting errors | 3 to 8 per month | 1 to 3 per month | Near zero, blocking rejection |
| Intercompany recharges | Spreadsheet calculation | Spreadsheet calculation | Automatic rules |
| Audit trail for external auditors | Weak | Medium | Time-stamped import log |
| Upfront cost | 0 SGD | 4,000 to 10,000 SGD | 20,000 to 50,000 SGD |
| Recurring cost | 16 h of accountant time per month | 6 to 8 h per month | 300 to 800 SGD per month |
The hidden cost lies in corrections: a CPF contribution posted to the wrong cost center distorts a subsidiary's margin for months, and tracking it down at year-end close sometimes takes longer than the original entry.
What the connector actually does
The connector retrieves the approved payroll journal (via API if the vendor offers one, otherwise through an automatically dropped file), applies the mapping rules to each entity's chart of accounts and cost center structure, checks that entries balance and pushes them into the ERP.
| Function | Detail | Estimated share of budget |
|---|---|---|
| Payroll journal retrieval | Vendor API or automated SFTP drop | 10 to 15% |
| Account mapping table | Pay items to GL accounts, per entity | 15 to 20% |
| Cost center allocation | Keys per employee, department, site or project, with history | 20 to 25% |
| Intercompany recharges | Shared staff, management holding, cost shares | 10 to 20% |
| Checks and rejections | Debit credit balance, missing accounts, closed cost centers | 10 to 15% |
| Monitoring interface | Import dashboard, retry, audit log | 10 to 15% |
The budget depends mainly on three factors: whether APIs exist on the payroll and ERP sides, the number of cost center structures, and the complexity of recharges. A 5-entity group with a management holding usually lands between 30,000 and 40,000 SGD.
Timeline and maintenance
| Phase | Duration | Deliverable |
|---|---|---|
| Scoping | 1 to 2 weeks | Map of pay items, entities and keys |
| Development | 3 to 5 weeks | Connector, rules, checks |
| Parallel testing | 1 to 2 monthly payrolls | Line-by-line comparison with manual entry |
| Go-live | 1 week | Cutover, training, documentation |
| Maintenance | 300 to 800 SGD per month | API updates, pay item changes |
Parallel testing on at least one full payroll is non-negotiable: it is what gives the external accountant and the auditors confidence. Also plan for table updates with every regulatory change (new contribution, rate change), usually covered by maintenance.
Mini case study
Mei Ling, finance manager of a Singapore group of 5 companies and 650 employees, spends 2 days a month posting payroll into the ERP, then about 6 hours a quarter correcting allocation errors. Illustrative scenario: a connector at 35,000 SGD, with maintenance at 600 SGD per month.
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- Time saved: 15 hours a month, or 180 hours a year, plus 24 hours of corrections, so 204 hours valued at 90 SGD loaded, about 18,400 SGD a year.
- First-year cost: 35,000 + 7,200 = 42,200 SGD.
- Following years: 7,200 SGD a year.
The connector pays for itself in about 3 years, then frees up about 11,000 SGD a year. Above all, Mei Ling gains 2 days a month for subsidiary margin analysis, which the CFO had been asking for.
FAQ
Our payroll software has no API, is that a blocker?
No. The connector can read an export file dropped automatically on a secure server. This usually adds 2,000 to 4,000 SGD of development for monitoring the drop.
Payroll data is sensitive, how is it protected?
The connector only carries amounts aggregated by pay item and cost center, not detailed individual payslips. Transfers are encrypted and hosting stays in Singapore, in line with the PDPA.
What happens if a new pay item is created mid-year?
The import is blocked with a clear message, the accountant maps the new item to an account in the interface, then reruns it. No entry lands in a suspense account without review.
How long for a 10-entity group instead of 5?
Cost is not proportional because rules are shared. Expect 20 to 30% more budget and 1 to 2 extra weeks of testing.
Can we add expense claims or leave accruals?
Yes, it is a standard extension. Leave and bonus accruals often add 4,000 to 8,000 SGD.
Let's scope your project. Tell us your payroll software, your ERP, and the number of entities and cost center structures: we will price the connector, an indicative budget and the testing schedule. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
