The verdict in three sentences
An umbrella company with 300 contractors that runs timesheets, expenses and invoicing in separate tools ties up 5 to 6 administrators on largely automatable work. Market software at EUR 15-30 per contractor per month costs EUR 54,000 to 108,000 a year at this volume, while a custom platform at EUR 40,000-90,000 excl. VAT pays off from year two. The real gain comes from automation: roughly 1 admin FTE saved per 150 contractors.
Daily life at a London umbrella company in 2026
London umbrella companies serve IT contractors, project managers and consultants billing EUR 500 to 900 a day. Every month the cycle repeats: the contractor emails a timesheet, an administrator checks it and gets client approval, the invoice goes out, payment arrives (or not) within 30 to 60 days, then payroll is calculated including expenses and any retained reserve. Each step lives in a different tool: spreadsheet, invoicing software, payroll software, inbox.
The consequences: timesheets received on the 5th of the following month, invoices issued 8 days late, tight cash flow, contractors phoning to ask about their net pay.
| Step | Fragmented process | Unified platform | Monthly gain (300 contractors) |
|---|---|---|---|
| Timesheet entry | Excel file by email | Mobile entry, one-click client approval | 40 h |
| Expenses | Receipt photos, re-keying | Scan with automatic reading, allowance caps | 35 h |
| Client invoicing | Manual creation | Automatic generation on timesheet approval | 30 h |
| Unpaid invoice chasing | Case by case | Automatic sequences at D+5, D+15, D+30 | 15 h |
| Payroll preparation | Re-keying into payroll software | Export of variable items | 25 h |
| Contractor queries | Phone and email | Contractor portal with calculator and history | 20 h |
Market software or custom platform
| Criterion | Market umbrella software | Custom platform |
|---|---|---|
| Entry cost | EUR 2,000 to 8,000 configuration | EUR 40,000 to 90,000 excl. VAT |
| Recurring cost (300 contractors) | EUR 4,500 to 9,000 per month | EUR 600 to 1,500 per month |
| 3-year cost | EUR 164,000 to 332,000 | EUR 62,000 to 144,000 |
| White-label pay calculator | Basic or missing | On your website, lead generator |
| Reserve management | Standard | Rules specific to your contracts |
| Payroll and accounting integration | Fixed connectors | Connectors to your tools |
| Time to go live | 1 to 2 months | 4 to 6 months |
| Roadmap | The vendor's | Yours |
Below 80 contractors, market software remains the best choice. Above 200, the custom platform costs less over three years and becomes a sales argument.
The pay calculator as an acquisition tool
A well-designed take-home pay calculator on your website converts 4 to 8 % of visitors into qualified contacts. From the day rate and number of days, it estimates net pay after the management margin (5 to 10 %), contributions, expenses and reserve. Built into the platform, it creates the future contractor's file directly and cuts onboarding from 10 days to 3. This module alone costs EUR 5,000 to 12,000 excl. VAT.
Mini case study
Sophie, founder of a 300-contractor umbrella company in London, employs 6 administrators at EUR 48,000 fully loaded per year. She also pays EUR 22 per contractor per month for partial software, or EUR 79,200 a year. She invests EUR 72,000 excl. VAT in a custom platform, plus EUR 12,000 annual maintenance. Automation frees 2 FTEs, reassigned to business development, worth EUR 96,000 of capacity. Licence savings: EUR 67,200 a year. Total first-year gain: EUR 163,200 against EUR 84,000 spent. Payback: 6 to 7 months.
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FAQ
Can the platform run payroll?
We recommend keeping certified payroll software and exporting variable items to it. Payroll in this sector is regulated and changes often.
How long to migrate 300 contractors?
Allow 4 to 6 months of development, then a migration in 2 waves over 6 weeks to avoid any payroll incident.
Does the end client need an account?
No. They receive a secure link to approve the timesheet in one click, cutting average approval time from 6 days to under 48 h.
How is data secured?
European hosting, encryption of sensitive data, two-factor authentication for administrators and an access log. This accounts for 8 to 12 % of the budget.
What is the cash flow impact?
Invoicing 8 days earlier on EUR 1.8 million monthly revenue frees around EUR 480,000 of working capital.
Let's scope your project. Umbrella platform with timesheets, expenses, invoicing and pay calculator, EUR 40,000 to 90,000 excl. VAT, delivered in 4 to 6 months. 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.
