Pay Grade Overlap: How to Calculate It and How Much Is Too Much

Pay Grade Overlap: How to Calculate It and How Much Is Too Much

Most comp teams never set pay grade overlap. They set range spread, they set midpoint progression, and overlap shows up as whatever those two choices happen to produce. Then a manager asks why a promotion from Grade 7 to Grade 8 only justifies a 3% raise, or a pay equity analysis flags two people doing different work at identical salaries, and someone finally does the arithmetic. The answer is almost always the same: adjacent ranges share 75% or 80% of their width, so moving up a grade barely moves anything. Overlap is not a byproduct of your structure — it is a design decision you already made without noticing. Here is the formula, the benchmark, and what to do when the number comes back wrong.

TL;DR

• Pay grade overlap = the share of a grade's range that is also covered by the grade above it.
• Formula: (Max of lower grade − Min of higher grade) ÷ (Max of lower grade − Min of lower grade).
• Shortcut: Overlap = 1 − (midpoint progression ÷ range spread). Overlap is fully determined by those two settings.
• Most traditional structures target 50–60%. Above 70% promotions stop meaning anything; below 30% you get pay jumps and compression at the boundary.
• You fix excess overlap by widening midpoint progression or narrowing range spread — usually by removing grades, not by adding them.

What pay grade overlap actually measures

Overlap is the dollar territory two adjacent grades share. If Grade 7 runs $64,000 to $96,000 and Grade 8 runs $70,400 to $105,600, every salary between $70,400 and $96,000 is legal in both grades. That shared band is $25,600 wide. Grade 7's whole range is $32,000 wide. So Grade 7 overlaps Grade 8 by 80%.

Some overlap is deliberate and healthy. A senior, high-performing analyst in Grade 7 should be able to out-earn a brand-new hire in Grade 8, because job level is not the only thing you pay for. Zero overlap only works in step structures, where progression is mechanical and seniority-driven.

Too much overlap is a different animal. It means your grades are not economically distinct, which raises an uncomfortable question: if the pay is the same, why do you have two grades?

The formula

The direct calculation

Overlap % = (Max of lower grade − Min of higher grade) ÷ (Max of lower grade − Min of lower grade) × 100

Using the numbers above: ($96,000 − $70,400) ÷ ($96,000 − $64,000) = $25,600 ÷ $32,000 = 80%.

If the higher grade's minimum sits above the lower grade's maximum, the numerator goes negative and you have a gap, not an overlap.

The shortcut worth memorizing

When your midpoint is the arithmetic midpoint of min and max — which is how the large majority of structures are built — overlap collapses to a two-variable relationship:

Overlap % = 1 − (midpoint progression ÷ range spread)

That is the whole thing. A 50% range spread with 10% midpoint progression gives you 1 − (0.10 ÷ 0.50) = 80% overlap, every time, at every grade, regardless of salary level. You do not need a spreadsheet to know where your structure sits — you need two numbers you already have.

It also explains why overlap problems persist. Teams try to fix an 80% overlap by adjusting individual ranges. That never works, because the ratio is doing the driving.

What different settings produce

Grade 7 midpoint held at $80,000 in every row:

Two rows produce exactly 50% overlap with completely different range widths. That is the point: overlap is a ratio, and you can land on your target from more than one direction.

How much overlap is too much

The working benchmark for a traditional graded structure is 50–60%. That range gives managers room to reward a strong performer without breaking the grade, while keeping a promotion economically meaningful.

Broadband structures are the deliberate exception. When you consolidate twelve grades into four bands, spreads widen to 100% or more and adjacent-band overlap drops sharply — the bands are far apart by design. If you are weighing that trade-off, broadbanding versus traditional structures walks through where each one holds up.

The distinction matters because most organizations are running traditional structures, not bands. Culpepper survey data published by SHRM found that 78% of companies use traditional salary structures and 11% use broadbands, with 9% running a hybrid (SHRM, Salary Range Structure Practices). If you are in the 78%, the 50–60% benchmark applies to you.

Above 70%: promotions stop paying

At 80% overlap with a 10% midpoint progression, the honest promotion increase from Grade 7 to Grade 8 is about 10% if you move the person to the same relative position in the new range — and near zero if you simply confirm they are already inside the new minimum. Managers learn this fast. They stop promoting people and start asking for out-of-cycle equity adjustments instead, which is how pay compression gets built into a structure one exception at a time.

Heavy overlap also creates a pay equity exposure. When two employees in different grades sit at the same salary, you need a documented, job-content reason for the grade difference. If the only difference is a title, that is the kind of pay disparity the EEOC's compliance guidance on compensation discrimination treats as requiring a legitimate, non-discriminatory explanation. "The structure has always looked like this" is not one.

Below 30%: cliffs and compression

Thin overlap causes the opposite failure. A promotion forces a large jump because the new minimum sits well above where the person is paid, so a routine move costs 18% instead of 10%. Managers respond by delaying promotions until budget allows, and strong people leave in the meantime. You also lose the ability to pay an exceptional Grade 7 performer more than a green Grade 8 hire.

If your structure is fighting you, the problem is usually upstream of the ranges. PointFactors scores your jobs against weighted compensable factors and produces the point hierarchy your grades should sit on — so you can see whether you have two real grades or one grade wearing two titles. See how job evaluation feeds your pay structure.

How to fix an overlap problem

1. Count your grades before you touch the ranges. Overlap above 70% almost always means too many grades for the actual job hierarchy. If your point scores show a smooth continuum and you have carved twelve grades out of it, collapsing to eight fixes overlap and the promotion problem in one move.

2. Widen midpoint progression before you narrow spread. Progression is the cheaper lever. Going from 10% to 15% progression at a 50% spread takes overlap from 80% to 70% without changing how much room managers have inside any single grade.

3. Vary progression by level rather than applying one number. Common practice runs progression narrower at the bottom and wider at the top — roughly 8–10% between entry grades and 15–20%+ at senior and executive levels, since market pay differentiates more sharply as scope grows. WorldatWork's salary structure policies and practices research tracks how these settings move by job level.

4. Re-anchor midpoints to market before you re-cut anything. If your midpoints have drifted, you are optimizing a structure that is already wrong. Fix the anchor first — how to set salary range midpoints covers the sequence — then recheck overlap.

Whatever you change, model where current employees land. Run range penetration on the new structure before you approve it. A structure that looks clean on paper but puts 15% of your population below minimum is a budget request, not a structure.

Where job evaluation fits

Overlap is a symptom. The underlying question — how many genuinely distinct levels of work does this organization have? — is a job evaluation question, not a pay structure question.

Point-factor job evaluation answers it by scoring each job against weighted compensable factors (skill, effort, responsibility, working conditions and their sub-factors) and producing a point total. When you plot those totals, natural breaks in the distribution tell you where grade boundaries belong. Grades built that way tend to land at healthy overlap automatically, because the point gaps between them are real. Grades built by counting titles do not. Converting job evaluation points into pay grades covers that step in detail, and salary structure 101 covers building the ranges once the grades exist.

Note the distinction that keeps this defensible: job evaluation measures the job, not the person in it. Internal equity — consistent pay relationships across jobs of comparable value — is what a sound structure delivers. Pay equity, the regulatory standard, is a separate test that a defensible structure makes far easier to pass.

FAQ

What is a good pay grade overlap percentage? For traditional graded structures, 50–60% is the common target. Broadband structures run much lower adjacent overlap because the bands themselves are wide and far apart. Step structures often run at or near zero.

How do I calculate overlap between two pay grades? Subtract the higher grade's minimum from the lower grade's maximum, then divide by the lower grade's full width (max minus min). Multiply by 100.

Why is my overlap the same at every grade? Because you applied one range spread and one midpoint progression across the whole structure. Overlap equals 1 minus progression divided by spread, so a constant pair of settings produces a constant overlap. Varying progression by level is what breaks the pattern.

Does high overlap cause pay compression? It contributes. High overlap makes promotions economically weak, which pushes managers toward off-cycle adjustments for their strongest people, which narrows the gap between levels further. The compression is real; the overlap is what made it rational.

Can two grades legitimately overlap by 80%? At the bottom of a structure, sometimes — entry-level grades often sit close together in the market. Across a whole structure it is a warning sign that you have more grades than levels of work.

Should overlap be the same for exempt and non-exempt populations? Usually not. Non-exempt structures tend to use narrower spreads and smaller progressions; exempt and executive structures use both wider. Run the calculation separately for each structure you maintain.

How often should I check overlap? Whenever you refresh the structure — annually for most organizations. It is a two-minute check once you have the spread and progression in front of you.

Start with the grades, not the ranges

If your overlap number came back above 70%, resist the urge to redraw ranges. Go back and ask whether every grade in your structure represents a real, defensible difference in job content. Most of the time, three or four of them do not — and merging those solves the overlap, the promotion economics, and the equity exposure at once.

PointFactors scores your jobs against a tested point-factor plan and shows you where the real grade boundaries are — in days, not quarters. Book a walkthrough and we will run a handful of your actual jobs through the method so you can see the point hierarchy your structure should be built on, or check pricing if you would rather run it yourself.

Sources: SHRM, Salary Range Structure Practices (Culpepper Salary Range Structure Practices Survey); WorldatWork, Salary Structure Policies and Practices; U.S. EEOC, Compliance Manual Section 10: Compensation Discrimination.

Justin Hampton is founder and CEO of PointFactors.