Every March, a controller somewhere in a mid-size manufacturer opens a spreadsheet of unpaid vendor bills and starts sorting. Not by amount. Not by age. By one column that did not exist three years ago: is this supplier a registered micro or small enterprise, and has the invoice been sitting unpaid for more than 45 days? Because for that slice of the payables ledger, delay no longer just annoys a vendor — it moves the buyer's own taxable income up for the year.
That column is the practical face of Section 43B(h) of the Income-tax Act, 1961, inserted by the Finance Act 2023 and effective from AY 2024-25 (financial year 2023-24). It is a small clause with an outsized behavioural effect, and most of the market is still adjusting to it.
What the clause actually says
Under Section 43B(h), a buyer can claim a payment to a micro or small enterprise as a deductible expense only in the year it is actually paid, unless it is paid within the limit set by the MSMED Act, 2006. That limit — from Section 15 of the MSMED Act — is 15 days where there is no written agreement, and up to 45 days where there is one (ClearTax). Miss it, and the deduction slips to a later year; the disallowed amount is added back to current-year income and taxed now.
The scope is narrower than the panic suggests, and precision matters here:
- It covers only enterprises classified micro or small with a valid Udyam registration — medium enterprises are excluded (Tally Solutions).
- It covers manufacturers and service providers, not traders — wholesale and retail sellers who registered on Udyam purely for priority-sector lending are outside it (IndiaFilings).
- It stacks on top of, and does not replace, Section 16 of the MSMED Act, under which a delayed buyer already owes compound interest at three times the RBI bank rate (PDR Court).
So the interest liability and the MSME Samadhaan recovery route (Ministry of MSME) were always there. What 43B(h) changed is who feels it first. Late payment used to be the supplier's problem to chase. Now it is a line item in the buyer's tax computation, surfaced by the buyer's own auditors, every 31 March.
The problem it is aimed at is real — and large
India's MSMEs were carrying ₹7.34 lakh crore in delayed receivables as of March 2024, according to the GAME–FISME–C2FO Delayed Payments Report 3.0 — down from a ₹10.7 lakh crore peak in 2022, but still over 4.6% of Gross Value Added across the country's 6.4 crore MSMEs (KNN India). The report is candid that the fall is policy-driven and the residue is structural: lopsided buyer-supplier bargaining power, slow dispute settlement, and weak enforcement, PSUs included.
The ripple: from "pay eventually" to "fund on time"
43B(h) does not conjure cash. A buyer who genuinely cannot pay a micro supplier inside 45 days now has a sharper choice: pay on time, or accept both an interest liability and a deferred deduction. That is precisely the pressure that pushes buyers toward structured early payment and supply-chain finance, so the supplier is paid inside the window by a financier while the buyer settles on its own longer cycle.
The demand signal is visible. TReDS platforms have discounted over ₹7.5 lakh crore in receivables since inception, with roughly ₹48,000 crore in FY 2024-25 alone and transaction volumes up about 70% year on year (M1xchange). And yet fewer than 1% of registered MSMEs are onboarded to TReDS — the rails exist and are growing fast, but they reach a sliver of the base.
The residual gap 43B(h) exposes
Here is the honest part. The registries, the RBI-regulated discounting rails, the Samadhaan recovery mechanism and the interest law all already exist. 43B(h) is not filling a hole in infrastructure — it is generating a wave of new financing demand that the verification layer underneath is not yet built to absorb at speed.
For every buyer racing the 45-day clock and every lender asked to fund earlier, the same unglamorous questions decide the deal: Is this supplier genuinely a micro or small enterprise under a live Udyam registration, or a medium/trader entity the buyer wrongly flagged? When did acceptance actually occur, so the clock is real and not disputed? And has this exact invoice already been discounted somewhere else? Answered slowly, these turn a tax-driven deadline into a bottleneck. Answered fast and provably, the financing closes inside the window.
That verification layer is what AssureSCF is built for — Signal to surface financeable, correctly-classified receivables early; Accept to convert an acceptance into a provable, tamper-evident record; Monitor to keep the exposure honest afterwards. AssureLocker never lends, prices, or decides the credit — it makes the lender's and buyer's judgement fast and defensible, which is exactly what a 45-day deadline demands.
If Section 43B(h) has turned your payables clock into a financing problem, that is the layer to look at next.
→ See how AssureSCF turns approved invoices into fundable, verified receivables — or check a receivable against the neutral duplicate-financing registry at AssureFirst before you fund.