Interest rate risk shows up in the timing mismatch between what
your assets earn and what your funding costs. Four views: the margin itself with yield
and cost on top of it, the maturity and repricing structure of your assets, and how far
each side actually moved when market rates moved. The timing view is asset-side only
— the UBPR treats every non-maturity deposit as short-term, so the funding side of
that picture isn't trustworthy enough to show.
Direct measurement
- Is your margin wider or narrower than a year ago? Than your paired bank's?
- Over the same stretch, did yield or cost do more of the work? Which direction did each move?
- Which maturity or repricing bucket holds the largest share of your assets? Is that where peers sit?
- Slide back through the earlier quarters — has your asset structure shifted, or held steady?
- When prime moved, how far did your loan yield follow? Same question for securities against the 10-year and the 30-year mortgage rate.
- When fed funds moved, how far did your time deposit cost follow? Your savings and MMDA cost?
- Which of your deposit categories moved least? Is that the same category your paired bank was stickiest in?
Further discussion
- Deposit rates are set by somebody at your bank; asset yields reprice through maturities, prepayments and new volume. Which of your two numbers reflects a decision, and which reflects structure?
- If your deposit costs lagged the market on the way up, will they lag on the way down — or is there less room to fall than there was to rise?
- If your assets are concentrated short, what does another rate cut do to your margin? If concentrated long, what did the last rise already do to it?
- Your yield moved less than the market did. Is that fixed-rate structure, competitive pricing, or mix?
- Is your current asset timing an intentional margin position, or the residue of what borrowers wanted?
- Over the past year, did your margin move the way your structure suggested it should? If not, what does that tell you the data isn't showing?
- Between you and your paired bank, who is better positioned for the rate path you actually expect over the next 12–24 months?
The asset yields are tax-equivalent and the deposit costs are not.
Don't subtract one page from the other to build a margin.