The simple version

Most ratios look better when the figure is bigger. This one does not, because it puts cost on top and income underneath, so the better reading is the smaller one.

That is the whole trick of it. A headline saying the figure came down is usually good news rather than bad.

What it will not tell you is scale. The reading can be identical across two quarters that were nothing alike.

The numbers

• The line labelled "Efficiency (d)": 60% for the second quarter of 2026 and 60% for the second quarter of 2025 (PNC Financial Services Group, Form 8-K Exhibit 99.1, second quarter 2026 financial highlights, Consolidated Financial Highlights table)
• Footnote (d) states the figure is calculated as noninterest expense divided by total revenue (same release)
• Total noninterest expense: $4,098 million against $3,383 million a year earlier (same release)
• Total revenue: $6,875 million against $5,661 million a year earlier (same release)
• The release's front-page Selected Ratios table labels net interest margin "(non-GAAP)". The efficiency line, two rows below it, carries no such label (same release)
• In the Consolidated Financial Highlights table, the footnote to net interest margin says an adjustment it uses is not permitted under generally accepted accounting principles. Footnote (d) on the efficiency line says nothing of the kind (same release)
• The release's Selected Ratios table prints the figure as 60 with no percent sign, while the Consolidated Financial Highlights table prints 60% (same release)

Why down is the good direction

Cost sits on top of the fraction. Anything that raises cost raises the reading, and anything that raises income pushes the reading down.

So the figure improves in two completely different ways. The firm can spend less, or it can take in more while spending the same.

Those are not the same achievement and the reading does not separate them. Someone seeing an improvement cannot tell from the figure alone which one happened.

The actual math on 60 and 60

Put the cost line over the income line. $4,098 million over $6,875 million is 59.6%, and a year earlier $3,383 million over $5,661 million was 59.8%.

Both print as 60%, so on this measure the two quarters are indistinguishable. Underneath, cost was up about 21% and income was up about 21%.

That is the limit of a scale-free reading. It exists to compare firms of different sizes, which makes it deliberately blind to one firm getting larger.

What this means

When a release says the efficiency reading came down, the firm is saying it got better at turning spending into income. The question worth asking is which half moved.

Where the definition lives is worth noting too. Here it is one line in a footnote, and in the release's front-page ratio table the net interest margin line, two rows up, carries a non-standard-measure label that the efficiency line does not.

Two firms can both report 60 and be run entirely differently. The reading is the start of a question rather than an answer.

What this is NOT

This article explains what a lender's efficiency ratio measures, why a lower reading is the better one, and what the figure cannot tell you, using PNC Financial Services Group's second quarter 2026 financial highlights, filed on Form 8-K, as the example. It is not a recommendation to buy, sell, or hold PNC Financial Services Group or any security, and it takes no view on the company's results, its costs, or how it is run. It is not a comparison with any other institution, and it is not a claim that 60 is a good or a bad reading. It does not predict future results. Every figure above is taken from the release's own tables and footnotes, and none of them is drawn from the quotation attributed to a named executive in that release, which was checked and contains no figures. The two arithmetic steps are ours on the release's numbers: the division producing 59.6% and 59.8%, and the year-over-year percentages for cost and income, which match the 21% the release prints for each. Several rows elsewhere in the release use a dash as a placeholder, and none of them is quoted or relied on here. This is not a political endorsement or criticism of anyone.

Sources

• PNC Financial Services Group, Inc., Form 8-K Exhibit 99.1, second quarter 2026 financial highlights, accession 0001628280-26-048244, filed July 15, 2026, Consolidated Financial Highlights and Selected Ratios tables and footnote (d)