Part 08 — Credit Risk Deep Dive
Cash Flow Assessment
Cash-flow assessment answers one question: after normal business expenses, household drawings, taxes and existing obligations, how much predictable cash remains for the proposed loan? In Indian SME lending the answer is rarely taken directly from audited profit. Lenders use assessed-income methods, banking surrogates, GST surrogates, settlement-data surrogates and, for secured loans, collateral-backed judgement. This page focuses on the first three because they drive unsecured business loans and small-ticket working-capital products.
The assessment must tie back to SME financial analysis and feed into underwriting decisioning. A program policy should define data hierarchy: statutory financials first for larger tickets, verified surrogate for smaller tickets, and manual credit judgement only within deviation authority.
For a worked case that places FOIR, DSCR, turnover and MPBF eligibility side by side, see The Credit Appraisal Package.
Assessed-Income Logic
Section titled “Assessed-Income Logic”Assessed income is not declared income. It is the lender’s estimate of sustainable monthly surplus. A common sequence is:
- Determine operating turnover from GST, banking, invoices or books.
- Apply an accepted margin by industry and borrower evidence.
- Remove fixed operating expenses, rent and salary.
- Remove proprietor drawings or minimum household expense.
- Remove tax and existing debt obligations.
- Apply a fixed obligation to income ratio (FOIR) cap or debt service coverage ratio (DSCR) cap.
For micro traders, lenders often use industry margin tables. A kirana store may get a lower net margin than a tailoring unit; a metal fabricator has raw-material volatility; a restaurant may have high gross margin but high rent, staff and wastage. The danger is false precision. If a lender says “8.5% net margin for all traders”, it will over-lend to low-margin wholesalers and under-lend to specialty retailers.
Banking-Surrogate Program
Section titled “Banking-Surrogate Program”A banking-surrogate program uses current-account and savings-account credits as the primary income proxy. It works best where sales are mostly banked: distributors, B2B suppliers, clinics, schools, small manufacturers, contractors receiving account transfers, and merchants with card or UPI settlement trails. It is weaker for cash-heavy retail, multi-account borrowers and businesses where credits include loans or circular transfers.
Program design should specify eligibility:
| Rule | Illustrative policy |
|---|---|
| Business vintage | Minimum 24 months; 12 months with deviation for same-location family business |
| Banking vintage | Main operating account active for 12 months |
| Minimum credits | At least ₹6 lakh credits in last 12 months for a micro ticket; higher by product |
| Bounce discipline | No more than 2 EMI/NACH bounces in last 6 months; no unpaid statutory dues visible |
| Credit concentration | Top 3 non-related credits not above 60% unless anchor-backed |
| Exclusions | Cash deposits above 40% of credits without field validation; circular transfers; loan disbursals |
| Bureau | No current 30 or more days past due; commercial rank within policy |
Worked example:
| Banking item, last 12 months | Amount |
|---|---|
| Total credits across submitted accounts | ₹1.62 crore |
| Less inter-account transfers | ₹18 lakh |
| Less loan disbursals and reversals | ₹10 lakh |
| Less cash deposits not explained by sales | ₹14 lakh |
| Eligible operating credits | ₹1.20 crore |
The borrower is a wholesale packaging trader. Policy accepts net business surplus at 9% of eligible operating credits for this sub-sector where GST and purchase bills broadly support the flow. Annual assessed surplus is ₹10.8 lakh; monthly assessed surplus is ₹90,000. Existing EMIs are ₹22,000. Policy FOIR cap is 60%, so maximum total EMI is ₹54,000 and incremental EMI capacity is ₹32,000. At 21% for 30 months, EMI per ₹1 lakh is roughly ₹3,770. Indicative loan amount is ₹8.5 lakh before ticket caps and risk cuts.
Now apply program caps:
- Maximum loan-to-annual eligible credits: 10%, so ₹12 lakh.
- Minimum average bank balance (ABB): last 6 months ABB ₹2.4 lakh, cap at 5 times ABB = ₹12 lakh.
- Bureau/risk band cap: medium-risk band maximum ₹10 lakh.
- EMI capacity cap: ₹8.5 lakh.
Final program eligibility is the lowest binding cap: ₹8.5 lakh. A credit manager may round to ₹8 lakh to leave bounce buffer.
GST-Surrogate Program
Section titled “GST-Surrogate Program”A GST-surrogate program uses GST returns, invoice data and filing behaviour. It is stronger for registered B2B businesses and weaker where turnover is exempt, cash retail, or split across multiple GSTINs. GST data must be borrower-consented and handled under the lender’s data policy; the RBI’s Digital Lending Directions emphasise borrower consent, purpose limitation and regulated-entity responsibility where lending service providers handle digital data (RBI Digital Lending Directions, 2025).
GST e-invoicing adds quality where applicable. GSTN explains that e-invoicing means reporting specified GST documents to a notified portal and obtaining an Invoice Reference Number, not generating invoices on the government portal (GSTN e-invoicing overview). Since the threshold has been reduced in phases, a lender should check whether the borrower is required to generate e-invoices and whether reported invoices are consistent with returns.
Illustrative GST program:
| Rule | Illustrative policy |
|---|---|
| GST vintage | Minimum 12 monthly returns, or 4 quarterly returns for QRMP taxpayer |
| Filing discipline | No more than 1 delayed GSTR-3B in last 6 periods |
| Turnover stability | Latest 3-month annualised turnover not below 60% of last 12-month average without explanation |
| ITC reasonableness | Input tax credit pattern consistent with industry; sudden spike triggers manual review |
| E-way/e-invoice checks | Required where applicable; missing IRN for covered B2B invoices is a red flag |
| Bank tie-back | Bank credits at least 70% of accepted GST turnover for unsecured lending, unless credit sales are verified |
Worked example:
| GST item | Amount |
|---|---|
| GSTR-1 outward taxable supplies, 12 months | ₹2.40 crore |
| Less sales to related GSTIN | ₹18 lakh |
| Less one-off machinery sale | ₹12 lakh |
| Accepted operating GST turnover | ₹2.10 crore |
| Bank-supported collections | ₹1.72 crore |
Policy says eligible turnover is the lower of accepted GST turnover and bank-supported collections divided by the expected collection ratio. If this segment normally has 45-day credit and policy accepts bank tie-back at 80%, eligible turnover = ₹1.72 crore / 0.80 = ₹2.15 crore, capped at GST operating turnover ₹2.10 crore.
Net margin is assessed at 7% because this is a B2B electrical goods distributor. Annual surplus = ₹14.7 lakh. After minimum proprietor drawings of ₹4.8 lakh and existing annual EMI of ₹3.0 lakh, free cash for new EMI is ₹6.9 lakh per year or ₹57,500 per month. At a conservative FOIR, the lender may cap new EMI at ₹45,000. At 20% for 36 months, EMI per ₹1 lakh is about ₹3,716, so cash-flow eligibility is ₹12.1 lakh. If policy caps exposure at 8% of GST turnover, turnover cap is ₹16.8 lakh. Final eligibility is ₹12 lakh.
Hybrid Surrogate
Section titled “Hybrid Surrogate”The best programs combine banking and GST rather than choosing one blindly. A simple hybrid rule:
eligible turnover = lower of banking operating credits adjusted for credit-sales lag, GST operating turnover adjusted for related-party and one-off invoices
Then apply:
assessed annual surplus = eligible turnover x approved net margin
incremental EMI capacity = assessed monthly surplus x FOIR cap - existing monthly obligations
This is conservative, but it protects against two common frauds: inflated GST invoices without collections, and borrowed money routed through bank accounts to create artificial credits.
Product Structure Matters
Section titled “Product Structure Matters”Cash-flow assessment should shape the loan, not merely decide yes or no. If monthly EMI capacity is weak but receivables are strong, an overdraft, invoice discounting line or supply-chain product may be better than an amortising business loan. If seasonality is high, monthly EMI may be replaced by step-up EMI or quarterly bullet interest only where policy and systems support it. If the borrower has high daily settlement visibility, a merchant cash advance can collect daily, but the annual percentage rate and charges must still be disclosed where applicable. RBI’s KFS circular applies to new retail and MSME term loans sanctioned from 1 October 2024 and requires annual percentage rate disclosure including charges (RBI KFS circular, 15 April 2024).
Controls for Surrogate Lending
Section titled “Controls for Surrogate Lending”Surrogates fail when policy trusts a single number. Controls should include:
- bank-statement parser with manual override reason codes;
- exclusion of circular transfers, loan credits, cash stuffing and related-party transfers;
- GST return pull directly from authorised source or trusted provider, not borrower PDFs alone;
- GSTIN-to-PAN and bank-account-name matching;
- bureau checks on proprietor, firm, company and key promoters;
- early vintage monitoring by source program, not only total portfolio;
- hard decline for suspected fabricated statements or invoice trails.
Document the math in the CAM. A future portfolio analyst should be able to segment loans by assessment_method = banking_surrogate, gst_surrogate, financials_based or hybrid, then compare vintage performance. That feedback loop is what turns underwriting from judgement into a learning credit system.