How a Consulting Firm Freed Up 15 Hours a Month After a Back-Office Restructure
Sam's List Editorial | 2026-06-06
The managing principal of a 12-person consulting firm was spending 15 hours a month on financial administration. He knew it was too much. He couldn't figure out where to cut.
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The problem wasn't that he was doing things that shouldn't be done — it was that his back office had been built for a five-person firm and never scaled. Two billing systems running in parallel. No project-level P&L. Time entries that had to be manually matched to invoices every billing cycle because the systems didn't talk to each other.
After System Six restructured the back office, the same work that had taken 15 hours took under two hours. The time savings were significant. The strategic insight that came with it was more valuable.
The Client and the Situation
The firm was a 12-person management consulting practice at $3.2 million in annual revenue. It had grown organically from a solo practice, adding staff as client demand grew, and the back-office infrastructure had been added reactively rather than designed intentionally.
The team was talented at client delivery. The business operations were a patchwork. A solo bookkeeper handled accounts payable and payroll. The managing principal personally reviewed billing, handled client billing disputes, ran the month-end close, and produced P&L reports from a combination of QuickBooks exports and manually updated spreadsheets.
The 15+ hours per month estimate was conservative. During peak billing cycles — end of quarter, project closeouts, renewal negotiations — it ran higher.
There was no CFO. The managing principal served that function, on top of leading client engagements, managing staff, and handling business development. The math on his time was unsustainable.
What System Six Found
The diagnostic phase took three weeks and involved a full review of the chart of accounts, billing workflow, time-tracking setup, and month-end close process.
Two Billing Systems, Neither Tied to the GL
The firm was running two billing software platforms simultaneously. The first had been implemented three years earlier. The second was added when a client required a specific invoice format that the first platform couldn't produce. Over time, different clients ended up on different systems, and no one wanted to migrate the relationship-sensitive billing history.
Neither system fed directly into QuickBooks. Revenue was entered manually into the GL from PDF invoices after the fact — typically two to three weeks after billing, creating a persistent lag between when work was done and when it appeared in the financials.
The manual entry process was where most of the managing principal's billing administration time disappeared. Every month-end required reconciling the two billing system outputs against bank deposits and then against the GL. Discrepancies appeared regularly because invoices sometimes got updated after initial entry. Tracking those changes back through three systems was a multi-hour exercise every cycle.
No Project-Level Cost Tracking
The chart of accounts tracked revenue by client. It did not track cost by engagement.
Consulting firms deliver value through people's time. The cost of delivering a project is primarily labor — specific employees, at their fully loaded cost, working specific hours on specific engagements. Without that information mapped to the GL, the firm had no way to calculate per-engagement margin.
They knew total revenue. They knew total cost. They did not know whether a given retainer client was profitable after fully loaded delivery cost. That gap was about to become consequential.
What Changed
System Six's engagement had four components.
First, they standardized the chart of accounts to support project-level tracking — adding engagement codes as cost centers within the GL so that labor and direct project expenses could be mapped to specific client relationships.
Second, they integrated the firm's time-tracking tool directly into QuickBooks, eliminating the manual reconciliation step entirely. Time entries approved in the time-tracking system fed directly into the GL as labor cost, mapped to the correct engagement code.
Third, they eliminated the parallel billing system. Existing client billing history was migrated to a single platform — a process that took six weeks and was done in parallel with live billing so no client experienced a disruption. The surviving platform connected directly to QuickBooks through an integration that eliminated manual revenue entry.
Fourth, they established a monthly close calendar with defined owner responsibilities and automated P&L consolidation. The managing principal received a complete P&L — by client and in aggregate — within five business days of each period end, without manually producing it.
The Strategic Finding: Two Major Clients Were Losing Money
The per-engagement margin visibility produced an immediate finding.
Two retainer clients represented 35% of the firm's revenue. Both relationships were long-standing. Both had been considered stable, profitable anchors of the business.
When System Six produced the first engagement-level P&L — factoring in the fully loaded labor cost of the specific employees delivering those engagements, plus direct project expenses — both retainers showed margins below 30% after delivery cost. One was at 22%. The fee structures hadn't been adjusted in two years while staff salaries had increased. The work scope had expanded informally through client requests without formal contract amendments.
At the firm's overall cost structure, engagement margins below 30% meant those clients were being subsidized by the more profitable project work. The managing principal hadn't known. The aggregate P&L looked fine because the higher-margin project engagements masked the retainer economics.
The finding led to two actions: renegotiation of one retainer relationship at a higher monthly fee (the client agreed without significant friction — they valued the relationship and the work), and a structured exit from the other client over a 90-day transition period.
The exits and renegotiations improved overall firm margin by approximately 8 percentage points. (Figures are illustrative — verify with System Six before publishing.)
The Outcome
After the engagement, the managing principal's time on financial administration dropped from 15+ hours per month to under two hours — a review of the automated close output, approval of the reconciliation summary, and any exception items that required judgment.
Per-engagement P&L is now available within five business days of each period close. The firm can identify margin compression in any client relationship before it becomes a structural problem.
The two billing systems are gone. The manual reconciliation work is gone. The month-end spreadsheet is gone.
What replaced them was a back office that the firm had outgrown the need to manage. The managing principal's 15 hours went back to client work and business development — where his time is worth considerably more than the financial administration it was spent on.
Professional Services Firms Outgrow Their Back Office Without Noticing
The pattern here is not unusual. Consulting firms, agencies, and professional services operators grow from small practices into midsize businesses while their financial infrastructure stays configured for the earlier version of the company.
The back office that worked at $500K doesn't work at $3M. The same manual processes that took one person two hours at small scale take a managing principal 15 hours at scale — because the volume is higher, the complexity is higher, and the stakes of getting it wrong are higher.
System Six specializes in back-office restructuring for professional services firms — bookkeeping, financial operations, and fractional CFO services built for consulting and agency models. If you're a firm principal spending meaningful time on financial administration, their profile on Sam's List is worth a look.
Figures in this case study are illustrative. Verify all details with the featured firm before publishing.
General information only, not legal or tax advice. Consult a qualified professional for your specific situation.