The verdict in three sentences
For a New York payroll bureau processing 2,500 pay slips a month for 180 clients, collecting payroll inputs by email is the main source of errors, follow-ups and late nights before each pay date. A custom payroll input portal, connected to your payroll engine, structures time off, bonuses, overtime, new hires and terminations before the specialist even opens the payroll software. New York agencies and integrators quote this project at 20,000 to 45,000 USD (market estimate), while the Kolonell grid puts it at 6,100 to 10,670 EUR excl. VAT, with a 10-week timeline and about 2 days a month of follow-ups saved.
Emails and spreadsheets or an input portal
Payroll engines such as ADP Workforce Now, Paychex or Gusto are excellent at calculation, much less at collecting inputs upstream. Their native employer entry screens exist but stay generic and fit poorly with 180 different client workflows.
| Step | Collection by email and spreadsheets | Custom portal connected to the payroll engine |
|---|---|---|
| Sending inputs | Emails, scanned PDFs, calls | Guided form per client, attachments |
| Consistency checks | Manual review by the specialist | Automatic rules: caps, time off, overtime law |
| Chasing late clients | One by one, 2 days a month | Automatic reminders at D-5, D-2, D-1 |
| Import into payroll | Re-keying, 4 to 8 minutes per pay slip | Structured import, 1 minute of review |
| New hires and terminations | Missing paperwork found at the last minute | Mandatory checklist, new hire reporting prepared |
| Audit trail | Email threads to reconstruct | Timestamped history per input |
| Client satisfaction | Recurring phone questions | Payroll status visible online |
The cost of payroll errors
A payroll error rarely costs only the fix: an off-cycle check, corrected tax filings, possible penalties and, above all, the risk of losing the client.
| Error type | Estimated monthly frequency (2,500 pay slips) | Estimated unit cost | Monthly cost |
|---|---|---|---|
| Time off not reported | 25 | 55 USD | 1,375 USD |
| Missed or wrong bonus | 15 | 50 USD | 750 USD |
| Wrong overtime | 12 | 45 USD | 540 USD |
| Late hire or termination | 6 | 150 USD | 900 USD |
| Re-keying mistake | 20 | 35 USD | 700 USD |
| Total | 78 errors | 4,265 USD a month |
These figures are 2026 orders of magnitude including specialist time at 50 USD loaded per hour. With a portal and automatic checks, a 60 to 70% reduction is a realistic target.
Mini case study
Illustrative example: Michelle, owner of a payroll and HR advisory bureau in New York, 8 payroll specialists, 180 clients, 2,500 pay slips a month.
| Indicator | Before | After 6 months (assumption) |
|---|---|---|
| Client follow-ups | 2 days a month | 2 hours a month |
| Input re-keying | 230 hours a month | 60 hours a month |
| Payroll errors | 78 a month | 25 a month |
| Payroll close | 2 days before pay date | 5 days before pay date |
Calculation: 170 re-keying hours saved at 50 USD is 8,500 USD a month, plus about 2,900 USD of avoided errors. For a project around 9,000 EUR and maintenance at 110 EUR a month, the portal pays back in about one month and frees capacity for 30 to 40 more clients without hiring.
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FAQ
Is the payroll engine connector reliable?
The import uses the input import formats or APIs offered by your payroll engine, tested on a sample of 10 to 20 clients during acceptance. A human review remains before each run.
Will our clients actually use the portal?
A 3 to 5 minute monthly form that works on mobile is typically adopted by 80 to 90% of clients within two cycles. The rest can keep sending a file, imported by the specialist.
Is the data secure?
Yes, US or EU hosting, encryption, per-client access rights and an access log. The setup supports SOC 2 style controls your clients increasingly ask about.
Can we add HR advisory requests?
Yes, an HR request module (offer letters, terminations, compliance questions) can be added in 2 to 3 weeks. It stays within the Kolonell grid range.
How long does rollout take?
Plan 10 weeks of development, then a pilot with 20 clients before opening to all 180. Full cutover takes two payroll cycles.
Let's scope your project. Tell us your pay slip volume, your payroll engine and your main pain points: we price a portal between 6,100 and 10,670 EUR excl. VAT delivered in 10 weeks. 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.
