OpEx-to-Gross-Profit / SG&A Leverage

Why this comes up

Operating expense as a share of gross profit, sometimes called SG&A leverage, is one of the clearest single signals of whether the agency's overhead is scaling with its GP or outrunning it. A ratio that's drifting up over time, even while GP itself is growing, means overhead is growing faster, and that's a trend worth catching before it shows up as a shrinking bottom line. This engine gives you the current ratio and, if you have a target, exactly how far current OpEx or current GP is from clearing it.

How we calculated this

Current Ratio = Operating Expense / Gross Profit
GP Needed at Current OpEx = Operating Expense / Target Ratio
OpEx Supported at Current GP = Gross Profit x Target Ratio

Worked example, using the calculator's own defaults: $220,000 operating expense, $400,000 gross profit, and a 45% target ratio.

Current ratio = 220,000 / 400,000 = 55.0%
GP needed at current OpEx = 220,000 / 0.45 = $488,889
OpEx supported at current GP = 400,000 x 0.45 = $180,000

At 55%, current OpEx is running well above the 45% target. Either GP needs to grow to $488,889 to bring the ratio down at the current spend level, or OpEx needs to come down to $180,000 to hit the target ratio at the current GP level, whichever is the more realistic lever in the near term.

What this means

• A ratio above your target means overhead is heavy relative to GP right now; the two "needed" figures show the two independent ways to close that gap, grow GP or cut OpEx, not a blend of both.
• Growing into the target (raising GP rather than cutting OpEx) is usually the healthier path if the agency is still building toward scale, since a lot of agency overhead is genuinely fixed and gets easier to cover as GP rises.
• A ratio trending in the wrong direction over several periods, even without a formal target, is worth investigating before it becomes a larger problem; check Staffing Sales Hire Break-Even or Back-Office Hire Break-Even before assuming the fix is a straight cost cut.

Limitations

Benchmark target ratios, if you use one, are dated context, not a target this engine assumes is right for your agency's stage or specialization. A young or fast-growing agency often runs a structurally higher ratio than a mature one, and a highly specialized niche agency may carry more overhead per dollar of GP than a high-volume generalist. Use a target ratio you've set deliberately for your own agency, not a generic industry figure.

Common mistakes

• Treating a single period's ratio as the full picture instead of tracking it over several periods to see the actual trend.
• Applying a generic industry benchmark ratio without adjusting for the agency's own stage, size, or specialization.
• Reaching straight for a cost cut when growing GP would close the same gap without shrinking the team or capability.

Frequently asked questions

What counts as "operating expense" here?

The agency's SG&A-style overhead: office, back-office and leadership compensation, systems, insurance, and similar costs, the same figure used as fixed operating expense elsewhere in these engines.

Is a lower ratio always better?

Generally, but not without limit; a ratio so low that it reflects understaffed back-office or sales functions can create its own risk elsewhere, like slower fills or weaker account management.

Where do I get a sensible target ratio?

From your own historical trend at a period the agency was performing well, or from a deliberately chosen benchmark for your segment and size, not a generic staffing-industry average applied without adjustment.

Next decision

• Check whether a sales hire would improve this ratio
• Check whether a back-office hire would improve this ratio