Engagement Economics: Budget vs Actual Hours, Write-Offs and Scope Control

A firm can be busy and unprofitable at once. The cause is usually found in the engagement, where the hours planned and the hours spent drift apart and nobody looks until the invoice goes out. Engagement economics is the discipline of budgeting hours before the work, comparing them to actuals while there is still time to act and learning from the difference. This article sets out the method, using the firm's own data.

What to measure

Four measures cover most of what a partner needs:

• Budgeted hours by task and by staff level, set before fieldwork.
• Actual hours recorded daily or weekly, by the same task and level categories.
• Fee agreed with the client, and the amount billed.
• Write-off or write-down, the difference between standard value of time and what the client paid.

From those, compute the effective price per hour: fee divided by actual hours. Compare it with the standard rate. The glossary entry on realization and utilization defines the related terms, and the companion article on realization rates and billing write-downs covers billing.

Building the budget

1. Start from the prior period's actuals. For a repeat engagement, the prior period's hours by task are the best base. For a new one, use similar engagements and the firm's standard programs.
2. Break it into tasks. Planning, risk assessment, cash, receivables, inventory, payables, payroll, equity, financial statement preparation, review, reporting and administration for an audit. Equivalent task lists for tax and advisory work.
3. Assign levels. Each task is split by who should do it: staff, senior, manager, partner. A budget that puts too many hours at the top is a pricing problem, and one that puts too few at the top is a quality problem.
4. Add review and communication time. Review is the most commonly under-budgeted task.
5. Record the assumptions. Client records ready by a date, the number of locations, prior-year adjustments, and use of client-prepared schedules.
6. Compare to the fee. If the budget at standard rates exceeds the fee by more than the firm accepts, decide before the engagement starts whether to reprice, scope down or accept it.

For audit engagements, the budget should follow the audit plan. See audit planning memo guide and audit busy-season capacity planning.

Tracking during the engagement

Set check points rather than waiting for the end:

• After planning. Compare actual planning hours with budget, and adjust the remaining budget if risk assessment changed scope.
• Mid-fieldwork. Compare hours to the percentage of procedures complete. If the share of hours spent is well ahead of the share of procedures complete, the overrun is visible while it can still be addressed.
• Before review. Hours to date, estimate to complete and projected total.
• Before billing. Final comparison and a decision on any billing adjustment.

The tracker should show budget, actual, estimate to complete and variance by task. Reports should reach the manager weekly during busy periods.

Classifying overruns

Not every overrun means the same thing. Classify each one so the response fits:

Record the category on each overrun. After a season, the totals by cause show where the firm loses money.

Scope control

Scope creep begins with a small favor. Controls that work:

• A written scope in the engagement letter with listed assumptions.
• A change-order form that any team member can raise and the manager approves, with the client's written agreement before the work.
• A rule that out-of-scope work is logged under a separate task code, even when it is not billed.
• A conversation with the client about changes at the time, not at invoicing.

Include the process in the engagement letter. See audit engagement letter and CPA firm pricing models.

Write-offs and what they teach

A write-off is a signal. Track write-offs by client, partner, service line and cause. A client with repeated write-offs is a candidate for repricing or dismissal. See client acceptance and continuance for small CPA firms. A partner whose engagements are consistently written off needs a conversation about scoping. A service line with systematic write-offs has a pricing or process problem.

Using the data to price next year

At the close of each engagement, record final hours by task and level next to the budget and the fee. Use the actuals as the base for next year's budget, remove one-time causes, add known changes and compare to the fee. The loop of budget, track, learn and reprice is what turns time records into pricing power.

Quality is not a variable

Budget pressure must not reduce necessary procedures, review or documentation. Engagement-level quality management requires that the engagement team has the time and resources to perform the work. See SAS 146 quality management at the engagement level and engagement quality review. An overrun explained by a shortcut is not an economy.

FAQ

How detailed should the task budget be?

Detailed enough that an overrun can be traced to a task. Overly fine budgets add timekeeping burden without insight.

Should staff see the budget?

Yes. Staff who know the budget manage their own time, and they flag problems early.

Do fixed-fee engagements still need timesheets?

Yes. The hours drive the next price and show where scope grew.

CORAA prepares ready-to-review audit files for US CPA firms; see /us.

Sources

• AICPA, Statement on Auditing Standards No. 146, Quality Management for an Engagement Conducted in Accordance With GAAS: https://a-us.storyblok.com/f/1015104/x/32853782b6/aicpa-sas-146.pdf

AU-C references are to AICPA Professional Standards, paraphrased here; read the standard itself before relying on a requirement. This page is guidance, not professional advice. Report an error