Workflow and engagement letter software for an accounting practice: custom cost

The verdict in three sentences

An accounting practice with 35 staff running 1,100 client files and its tax deadlines on spreadsheets does not know its real profitability per engagement. Off-the-shelf practice management software covers 70 to 80% of the need for EUR 25 to 60 (about USD 30 to 70) per user per month, but struggles with each firm's own rules (payroll, legal secretarial, advisory work). A custom tool connected to your production software pays off once unbilled time exceeds 5% of revenue, which is the case for most firms of this size.

What spreadsheet management really costs

In a 35-person practice, the spreadsheet does everything: year-end planning, VAT or sales tax return tracking, client reminders, timesheets. The problem is not the tool, it is the missing link between three pieces of information: what was sold in the engagement letter, the time actually spent and what was invoiced. Without that link, a partner finds out at year end that a small property holding company consumed 14 hours for EUR 900 in fees.

For a firm billing EUR 3.2 million (about USD 3.5 million) in fees, every point of unbilled time recovered is worth EUR 32,000 a year. That is the starting point for any software business case.

Off-the-shelf software or custom tool: comparison

Practice management products for accountants in Europe and North America are mature. They handle timesheets, billing and often standard engagement letter templates. Their limit shows when the firm wants its own rules: mixed fixed fees, one-off assignments, budgets per staff member, overrun alerts.

At Kolonell, a business application of this kind falls into the medium application band, 4,000,000 to 7,000,000 FCFA (EUR 6,100 to 10,670), or complex, 7,000,000 to 15,000,000+ FCFA (EUR 10,670 to 22,870+) if you add a client portal with document upload. Maintenance ranges from 35,000 to 120,000 FCFA per month (EUR 53 to 183) depending on the service level. Development is run remotely, with weekly video check-ins with the lead partner.

The modules that make the difference

Three building blocks deliver most of the gain. The first is the engagement letter generator: the staff member picks the client type, ticks the services, and the document is assembled from your fee schedules, ready for e-signature. The second is production tracking: each file shows its hour budget, time consumed and upcoming deadlines (annual accounts, VAT, payroll filings), with an alert at 80% of budget. The third is the profitability dashboard per engagement, client, staff member and partner.

Synchronisation with the production software uses its API when the vendor provides one, otherwise a scheduled import of timesheet files. Data stays hosted in the European Union or your own jurisdiction, in line with GDPR and professional secrecy obligations.

Mini case study

Claire, partner in a 35-person accounting firm, bills EUR 3.2 million in fees and estimates her unbilled time at 7%, or EUR 224,000. The custom tool brings that rate down to 3% within 12 months: a 4-point gain worth EUR 128,000 a year. Preparing the 180 annual engagement letters drops from 50 to 8 minutes, freeing 126 hours valued at EUR 75 per hour: EUR 9,450. With a EUR 60,000 project and EUR 8,000 of annual maintenance, payback comes in under 6 months.

FAQ

Do we need to replace our accounting production software?

No. The custom tool plugs into your existing production software and pulls files and time entries through an API or import. In 90% of projects, no accounting data migration is needed.

Are the generated engagement letters compliant with professional standards?

Templates are built from your current letters, approved by your partners and aligned with your professional body's guidance. The generator only assembles clauses and fees you have approved, in 5 to 10 minutes instead of 45.

How long does the project take?

Allow 3 to 5 months for a firm of 30 to 50 staff: 4 weeks of scoping, 8 to 12 weeks of development, then 4 weeks of acceptance testing on 50 pilot files.

Where is client data hosted?

On servers in the European Union or your chosen region, encrypted and backed up daily. Access is logged per user, which simplifies quality reviews and audits.

Isn't off-the-shelf software enough for a 15-person firm?

Often yes. Below 20 staff and 500 files, a subscription at EUR 25 to 40 per user per month is usually more cost-effective than custom development.

Let's scope your project. We define production tracking, engagement letters and profitability dashboards with you, on a 3 to 5 month schedule. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.