What Is AGI (Adjusted Gross Income, Agency Finance)?

Total billings overstate what an agency actually took home the moment media spend is involved. An agency that manages a $500,000 media budget for a client and keeps a 15% fee has not "earned" $500,000, it earned $75,000, and every internal economics calculation, overhead as a percentage of revenue, profit margin, revenue per employee, gets distorted if it is run against the gross figure instead of AGI.

This distinction matters more than most agencies act on it. TMetric's 2025 benchmark study of 250-plus agencies found that only 20% of agencies track profitability by client, project, or service line at all, and separately found that 47% of firms lose up to $500,000 a year on untracked billable hours, with 23% of billable time never invoiced. Neither of those numbers is possible to fix without first knowing the real revenue base, AGI, that overhead and profitability calculations should be measured against.

The same benchmark put industry-average staff utilization at 60%, with the optimal, peak-profit range running 65% to 80%. Utilization rate is itself a ratio measured against available capacity, and capacity planning only makes sense once revenue is counted correctly. An agency calculating overhead against gross billings that include a large media pass-through will consistently understate its own overhead burden relative to what it actually earned.