The verdict in three sentences
A 35-person CPA firm in Miami that does not measure engagement profitability usually leaves 5 to 10 margin points on the table, mostly on fixed-fee tax returns and payroll engagements. A custom time and engagement tracking application costs 40,000 to 90,000 USD with a Florida agency (2026 market estimate) and ships in 10 to 14 weeks, versus 30 to 70 USD per user per month for off-the-shelf tools. If your engagement letters, per-client budgets and overrun alerts fit a standard product, stay on the subscription; if not, a custom build often pays for itself in under two years.
Subscription or custom: the numbers for 35 users
A typical Miami firm handles 800 to 1,000 clients: bookkeeping, individual and business returns, audits and reviews, payroll, advisory. Partners know revenue per client, but rarely the real margin per engagement. Here are 2026 orders of magnitude for equipping 35 people.
| Option | Upfront cost | Recurring cost (35 users) | 3-year cost (estimate) | Main limitation |
|---|---|---|---|---|
| Entry-level time tracking tool | 0 to 2,000 USD setup | 35 x 30 USD = 1,050 USD per month | 37,800 to 39,800 USD | Basic engagement budgets |
| Mid-market practice management suite | 3,000 to 8,000 USD | 35 x 50 USD = 1,750 USD per month | 66,000 to 71,000 USD | Fixed reports, spreadsheet exports |
| Premium suite integrated with tax software | 8,000 to 15,000 USD | 35 x 70 USD = 2,450 USD per month | 96,200 to 103,200 USD | Cost grows with every hire |
| Custom build, Miami agency | 40,000 to 90,000 USD | hosting and support 500 to 1,200 USD per month | 58,000 to 133,200 USD | 10 to 14 week lead time |
| Kolonell application (medium complexity) | 4,000,000 to 7,000,000 FCFA (6,100 to 10,670 EUR) | maintenance 75,000 FCFA per month (110 EUR) | 10,060 to 14,630 EUR | Remote team, video workshops |
| Upgraded shared spreadsheet | 0 | 6 to 10 internal hours per month | hidden cost | No alerts, entry errors |
Per-user prices are 2026 orders of magnitude observed among US practice management vendors, excluding billing or document management add-ons sold separately. Agency prices are market estimates, not an official rate card.
The modules that drive the budget
Cost depends less on the number of screens than on the firm's business rules: rate cards by staff level, fixed annual fees, out-of-scope work billed hourly.
| Module | Scope | Share of budget | Indicative timeline |
|---|---|---|---|
| Time entry | Weekly timesheet, mobile entry, allocation by client and task (tax, audit, payroll, advisory) | 15 to 20 % | 2 weeks |
| Engagement letters and budgets | Budget in hours and dollars per engagement, hourly rate by level (staff, senior, manager, partner) | 20 % | 2 to 3 weeks |
| Overrun alerts | Thresholds at 80 % and 100 % of budget, partner notification, mandatory justification | 10 to 15 % | 1 to 2 weeks |
| Profitability dashboards | Margin by engagement, client and staff member, realization rate | 20 % | 2 to 3 weeks |
| Connectors | Client list import from the tax or practice platform, export to billing | 15 % | 2 weeks |
| Capacity planning | Deadlines (April 15, extensions to October 15, quarterly payroll filings), team capacity | 10 to 15 % | 1 to 2 weeks |
Where does margin leak? Three items recur in most firms: fixed-fee returns that overrun their budget by 20 to 40 %, payroll engagements underpriced as the client's headcount grows, and unallocated hours, often 8 to 12 % of total time. A realization rate (billed hours over worked hours) between 75 and 85 % is common, and every point gained goes straight to margin. To scope a custom web application, start by listing your 20 least profitable clients: they are the ones that justify the investment.
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Mini case study
Linda, managing partner of a 35-person CPA firm in Miami (illustrative scenario), generates 4,000,000 USD in revenue with an 18 % operating margin. After three months of time tracking, the profitability dashboard shows that 60 of 900 clients exceed their fixed fee by more than 30 %.
- Recovering 5 margin points would mean 200,000 USD a year.
- Conservative first-year assumption: 2 points, or 80,000 USD, from repricing 60 engagement letters and billing out-of-scope work.
- Investment: 70,000 USD of development plus 900 USD per month of support, or 80,800 USD in year one.
- Payback around 12 months, then an annual run cost of 10,800 USD versus 21,000 USD for a suite at 50 USD per user.
FAQ
How long does it take to deploy custom time tracking software? Plan for 10 to 14 weeks, including 2 weeks of scoping with partners and managers. Migrating 12 months of time history adds 1 to 2 weeks.
Will staff actually log their time? Adoption depends on simplicity: daily entry in under 3 minutes and automatic Friday reminders. As an order of magnitude, the complete timesheet rate moves from about 60 % to over 90 % within two months when partners use the dashboards in meetings.
Can it connect to our tax and accounting platform? Yes, through the vendor API when available or scheduled CSV exports. Budget 3,000 to 8,000 USD per connector depending on API quality.
Where is the data hosted, and what about security? The application can be hosted in US data centers for 50 to 150 USD per month, with access logs, encryption and daily backups. Client data stays under the firm's control, in line with IRS safeguarding requirements for tax preparers.
At what size does custom make sense? Below 15 users, a subscription at 30 or 50 USD per month is usually enough. Beyond 30 staff with complex fixed fees, the 3-year cost gap and the margin gain make custom relevant.
Let's scope your project. Send us your firm size, engagement types and current tools: we will price a time and engagement tracking application within Kolonell's 4,000,000 to 7,000,000 FCFA range (6,100 to 10,670 EUR), delivered in 10 to 14 weeks, through our quote form. 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.
