Hello everyone, 
 
Welcome to the 207th edition of The Pattern. 
 
Almost every retail credit decision in India runs through one number: FOIR, the Fixed Obligation to Income Ratio. It's the share of a borrower's gross monthly income already committed to fixed obligations — EMIs, rent, insurance — and lenders use it to judge whether someone can take on more debt. Most banks and NBFCs treat a FOIR between 40% and 60% as acceptable, and applications above 60% face delays or rejection. It is the backbone of Indian retail underwriting. 

It is also, right now, blind to the most important thing happening to borrowers. 

The shock the number can't see 

Start with what's hitting households. Wholesale Price Index (WPI) inflation reached 8.3% in April 2026, a 42-month high — with crude petroleum inflation at 88% and fuel-and-power at 24.71%, driven by the West Asia war and the disruption to India's crude imports through the Strait of Hormuz. After months of oil companies holding the line, retail petrol prices rose sharply in the second half of May, and the fuel shock is now visibly slowing middle-class spending and a fragile consumption recovery. 

Watch how fast buyers reacted. Electric two-wheeler sales jumped 63% year-on-year in May 2026, and the surge was concentrated in the second half of the month — about 66,000 units in the first half against 104,000 in the second — which Autocar attributes directly to the mid-May petrol price hike. That is a household-budget decision made under pressure: when fuel jumps, buyers move to cut their running costs. The sensitivity to the pump is real, and it is immediate. 

FOIR sees none of it. And it misses it in two distinct ways. 

Blind spot one: the denominator 

FOIR is calculated on gross income — the number on the payslip — which lenders treat as the measure of how much disposable income a borrower has for new EMIs. But inflation doesn't cut the payslip; it cuts what the payslip buys. A borrower earning ₹40,000 still enters the calculation as ₹40,000 even after that income has lost a chunk of its real purchasing power to fuel and food. Their true repayment capacity has fallen. The ratio hasn't moved a basis point. 

Blind spot two: the numerator 

FOIR counts only formal obligations — EMIs, rent, insurance — and treats variable costs like fuel as something lenders may weigh informally rather than build into the ratio. But in an oil shock, those "variable" costs are the ones exploding. Everyone buys fuel and food; the difference is that for a low-income borrower they swallow most of the budget. So when prices jump, repayment capacity takes a real hit — and FOIR never sees it. 

Why it threatens some lenders more than others 
Stack the two blind spots together and the exposure isn't evenly spread. A lender whose book skews affluent is largely insulated — for those borrowers, fuel and food are a small share of income, a sharp move at the pump is a rounding error, and the FOIR on file stays honest.  
 
But a lender concentrated in small-ticket, lower-income, new-to-credit borrowers — the two-wheeler financier, the ₹12,000-phone lender — is holding a book where fuel and food dominate the borrower's budget, and where both blind spots fire at once: real income compressed, real costs inflated, none of it visible in the number they underwrote on. The more your portfolio sits at that end, the more your book looks healthier than it is. And it's already showing: CareEdge expects NBFCs' two-wheeler loan books to grow more slowly in FY26, with financiers turning cautious amid rising asset-quality stress in the segment. 

The honest objection 

There's a real counterargument worth taking seriously.Neelkanth Mishra, Axis Bank's chief economist and India's incoming Executive Director at the World Bank, argues the shock is manageable. It’s a modest fuel pass-through, a one-time step-up inflation rather than sticky inflation, and aggregate demand remains strong. He may be right about the average. But the average is the problem. A national figure carried by its healthier top half can look fine while its bottom half erodes — and FOIR, by construction, reads every borrower as if they were the average. The optimistic macro case and the static metric make the same mistake in the same place. 

The lag 

There's also a timing trap. FOIR is a snapshot taken once, at origination, and it is never re-run on a performing loan. Delinquency dashboards, meanwhile, report the past. So even in the benign scenario — a temporary shock that fades by next year — a temporary squeeze on a thin-margin borrower still converts into a missed EMI, and that shows up in the 30-plus-days-overdue data a quarter or two after the borrower's cushion actually gave way. The danger sits where it's hardest to see in advance: thin-file borrowers, of whom nearly half already hold another live retail loan, so a default in one category can cascade into delinquencies across the rest. 

The takeaway 

FOIR was built for a stable-price world — one where the gap between a borrower's gross income and what they can actually spare stays roughly constant. An oil shock prises that gap open at the bottom of the book, and the metric is structurally incapable of registering it. The lenders who come through this well won't be the ones watching the car-sales headline and relaxing. They'll be the ones stress-testing the thin end of their portfolio against fuel and food inflation, and re-underwriting the most exposed borrowers before the delinquency dashboard tells them what they could have known a quarter earlier. The risk isn't in the rate, and it isn't in the headline Consumer Price Index (CPI). It's in the number that can't see the squeeze. 

 
Reading list 

• Priority sector lending must reflect India's changing economy 

• India, Nepal launch UPI-NPI linkage for real-time cross-border remittances 

•  UPI, AI agents and faster scams: Why Indian banks are sounding the fraud alarm 

•  Indian banks likely to see further decline in bad loans despite economic challenges: Report 

Thank you for reading. If you liked this edition, forward it to your friends, peers, and colleagues. You can also connect with me on X here and follow FinBox on LinkedIn to get the latest updates.  
 
Cheers,  
Mayank  
 
All opinions expressed are my own and do not necessarily reflect the views of FinBox or its promoters.