The verdict in three sentences
For a practice with 900 small-business clients, document chasing costs more in lost time than any software: 6 hours per week per accountant, close to 6,000 hours a year for 22 people. A document collection SaaS at GBP 7 to 13 per client per year is enough while your processes stay standard, but a custom portal at GBP 26,000 to 47,000 pays off once you need a deep link to your practice management system and reminders tailored to each engagement. Under the assumptions below, payback lands around 14 months.
What manual document chasing really costs
Chasing small clients is invisible work: emails, calls, texts, sorting files sent by WeTransfer or post. In London, an accountant costs between GBP 45,000 and 58,000 fully loaded in 2026, roughly GBP 36 per hour.
| Item (22-person firm, 900 clients) | Annual volume | Estimated 2026 cost |
|---|---|---|
| Chasing missing documents (6 h/week/accountant) | 5,940 hours | GBP 214,000 |
| Manual keying of paper or PDF receipts | 1,800 hours | GBP 65,000 |
| Late accounts caused by missing records (penalties, overtime) | 120 clients | GBP 15,000 |
| Untracked email exchanges (AML, KYC risk) | 900 clients | not quantifiable, regulatory risk |
| Total hidden cost | about GBP 294,000 per year |
Even if software only removes 50 % of that time, the stake exceeds GBP 130,000 a year. That is the baseline that justifies the investment.
Collection SaaS or custom portal: the cost comparison
Market tools (portals bundled with practice software, bookkeeping apps with OCR) are effective and quick to deploy. Their limit shows when the firm wants workflows per engagement type (payroll, company secretarial, tax), a checklist per client, or a connection to a closed practice system.
| Criterion | Collection SaaS | Custom portal |
|---|---|---|
| Upfront cost | GBP 0 to 2,600 setup | GBP 26,000 to 47,000 |
| Recurring cost | GBP 7 to 13 per client per year (6,300 to 11,700) | maintenance GBP 520 to 1,050 per month |
| Go-live time | 2 to 6 weeks | about 4 months |
| Receipt OCR | included, standard categories | included, firm-specific rules |
| Automated reminders | generic templates | scenarios per engagement, per tax deadline, per client |
| Practice system link | vendor API, often partial | full sync of clients and statuses |
| Data and code ownership | vendor | the firm, UK hosting |
| Branding | vendor logo visible | portal in the firm's colours |
Rule of thumb: below 400 clients or with standard processes, SaaS wins. Above 700 clients with several service lines, custom pays back faster than most partners expect.
What a GBP 26,000 to 47,000 custom portal includes
| Module | Function | Share of budget |
|---|---|---|
| Web and mobile client area | photo upload of receipts, history, messaging | 25 % |
| Dynamic checklists | documents expected per engagement and deadline (VAT, year end, payroll) | 15 % |
| Reminder engine | email, SMS, escalation to the responsible accountant | 15 % |
| OCR and pre-coding | invoice reading, duplicate detection | 20 % |
| Practice system connector | sync of clients, statuses, documents | 15 % |
| Security and compliance | strong authentication, access logs, UK GDPR | 10 % |
The low end (GBP 26,000) covers a portal with checklists and reminders. The high end (GBP 47,000) adds advanced OCR and a two-way connector.
Mini case study
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Claire, a partner in a 22-person accounting firm in London, invests GBP 36,000 in a custom portal, plus GBP 780 per month of maintenance. After six months, chasing time drops from 6 to 2.5 hours per week per accountant. Gain: 3.5 hours x 22 x 45 weeks = 3,465 hours, about GBP 125,000 of freed capacity per year. Claire did not cut headcount: she took on 80 new clients without hiring. First-year cost: 36,000 + 9,360 = GBP 45,360. Allowing for gradual client adoption of the portal (40 % in year one), breakeven comes in month 14.
FAQ
How long until small clients adopt the portal?
Allow 6 to 9 months to reach 70 % of documents uploaded through the portal. A mobile app with receipt photos speeds up adoption, especially among tradespeople and retailers.
Can the portal connect to our practice management software?
Yes, if the vendor exposes an API or structured imports, which most do in 2026. The connector represents about 15 % of the budget, GBP 4,300 to 7,000.
Is OCR reliable on till receipts?
On PDF invoices, field accuracy exceeds 95 %. On photographed receipts, expect 80 to 90 %, hence a validation step by the accountant.
Where is the data hosted?
We recommend UK or EU hosting, GBP 70 to 220 per month depending on volume, with daily backups and access logs compliant with UK GDPR.
Can we start small?
Yes: a first version at GBP 22,000 to 26,000 (client area, checklists, reminders) delivered in 10 weeks, then OCR and the connector in a second phase.
Let's scope your project. Send us your client count, practice software and service lines: we will price a portal between GBP 26,000 and 47,000 with a 4-month plan. 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.
