AS | Ankit Sarawagi|Founder, CFOmatrix·July 2026·9 min read | A system, not a scramble |
- Four exposures, one root cause: a late payment to a micro or small vendor triggers 43B(h) disallowance, Section 16 interest, MSME Form 1 penalty risk, and a possible Samadhaan case.
- Start with a vendor master. You cannot comply with a rule you cannot see; tag every vendor’s Udyam status (micro or small, manufacturer or service provider) and refresh it yearly.
- Hold terms to 45 days in writing, and back it with an ageing report that flags micro and small dues before they cross the line.
- 43B(h) has no grace period. Paying before the return-filing date does not save the deduction; only paying before 31 March does. Run a year-end review.
- Two dates, twice a year: file MSME Form 1 by 30 April and 31 October, and disclose unpaid MSME dues in your financial statements.
| 45 days The hard payment ceiling for a micro or small vendor | 2 filings MSME Form 1 every year: 30 April and 31 October | 31 March The 43B(h) deadline to protect this year’s deduction |
Why a Buyer Must Care: The Four Exposures
MSME vendor compliance is not a supplier-only topic. If you buy from registered micro and small enterprises, and almost every company does, four distinct risks sit on your side of the transaction the moment a payment slips past the statutory window. Miss the 15 or 45 day limit and you are not exposed to one penalty, you are exposed to four at once.
Notice that three of the four bite even if the supplier never complains. Disallowance, interest and the Form 1 penalty are automatic consequences of the calendar, not of a dispute. That is exactly why a buyer needs a system rather than goodwill. For the supplier-side view of the same rules, see our pillar guide to MSME delayed-payment recovery.
Build an MSME Vendor Master
You cannot comply with a rule you cannot see. The foundation of the whole playbook is a single source of truth: a vendor master that tells you, for every supplier, whether it is a micro or small enterprise and therefore whether the 45-day clock, 43B(h) and Form 1 apply. Build it once, then keep it current.
Under the revised classification effective 1 April 2025, a micro enterprise sits within ₹2.5 crore of investment and ₹10 crore of turnover, and a small enterprise within ₹25 crore and ₹100 crore. A vendor is not downgraded unless it falls below both limits, so do not reclassify on a single soft year.
→ Download our free MSME vendor tracker (a ready-made register with Udyam status, classification, payment-term and ageing columns already built in). To confirm how vendors register, see our Udyam registration guide.
Payment-Terms Discipline: The 45-Day Line
The cheapest place to fix MSME risk is in the contract, before the first invoice. Under Section 15 of the MSMED Act, a written agreement can set any payment term up to 45 days; anything longer is void to that extent, and with no written agreement the limit drops to just 15 days. So a buyer who negotiates 60 or 90 day terms with a micro or small vendor is not actually buying more time, the law caps it at 45 regardless.
Do not assume a long-standing 60-day PO template protects you. Against a registered micro or small vendor it is unenforceable past 45 days, and your finance team may still be treating it as compliant. Audit your standard purchase terms for MSME vendors specifically.
Tracking and Alerts
A vendor master tells you who is in scope; an ageing report tells you when they are about to bite. The discipline is simple: filter your payables ageing to micro and small vendors only, and put an alert on any bill approaching 45 days. The point is to pay before the clock strikes, not to explain afterwards why you did not.
| Days outstanding | Status | Action |
| 0 to 30 days | On track | Schedule for payment run |
| 31 to 45 days | Alert | Clear before day 45, no exceptions |
| Over 45 days | Breached | Interest runs; goes into Form 1 |
The moment a micro or small bill crosses 45 days, two things happen automatically: Section 16 interest starts compounding, and that supplier now belongs in your next MSME Form 1. A good tracker makes both visible on the same screen. Want the exact interest figure on a breached bill? → Use our MSME delayed-payment interest calculator.
The Year-End 43B(h) Review Before 31 March
Section 43B(h) is the exposure with a hard deadline, and it is unlike the rest of Section 43B in one crucial way: there is no grace-period proviso. For other 43B items you can pay up to the return-filing date and still claim the deduction. Not here. If a micro or small bill is unpaid on 31 March and it is past the 15 or 45 day limit, the deduction is gone for that year, full stop. That is why a year-end review matters.
Do the 43B(h) sweep in early March, not on the 31st. Treat it like a mini close: a clean list of at-risk micro and small dues, a funded payment run to clear them, and a reconciled Form 3CD position. The exercise costs a day and can save far more in deferred tax and avoided interest. For returns from Tax Year 2026-27 onward, the same discipline just cites Section 37(2)(g) instead of 43B(h).
→ Read the full breakdown of Section 43B(h) for buyers for the worked mechanics and edge cases.
MSME Form 1: The Half-Yearly Cadence
MSME Form 1 is a separate obligation under the Companies Act, not the MSMED Act, and it catches many buyers off guard. Every company that owes a micro or small supplier for more than 45 days at any point in a half-year must file this return with the Registrar of Companies, twice a year, on a fixed cadence.
| Reporting half-year | Due date |
| October to March | 30 April |
| April to September | 31 October |
On the current MCA V3 form, if even one payment to a supplier breached 45 days during the half-year, all transactions with that supplier must be reported, even those paid on time. And the penalty for non-filing is not trivial: about ₹20,000 plus ₹1,000 for every continuing day under Section 405(4). Two dates a year, easy to miss, expensive to skip.
→ See our step-by-step guide to filing the half-yearly MSME Form 1 return, including what counts as a reportable due and how the V3 form handles part-paid suppliers.
Disclosure in Your Financial Statements
The last piece is disclosure. Under Section 22 of the MSMED Act, a buyer must disclose in its annual financial statements the amounts still owed to micro and small suppliers at year-end, along with the interest due or paid under the Act. This is where the four exposures become visible to your auditor, your board and, if you raise capital, your investors.
Because the interest under Section 16 is disallowed for tax (Section 23), this disclosure ties straight back to your 43B(h) position. Get the vendor master and ageing right through the year, and this note writes itself at close instead of triggering an audit query.
“Buyers used to see paying MSMEs late as a free source of working capital. Since 43B(h), it is one of the most expensive: you lose the deduction, you pay non-deductible interest, and you still have to disclose all of it.”
Ankit Sarawagi, CFOmatrixFrequently Asked Questions
What must a buyer do to stay MSME-compliant?
Build a system, not a one-off fix. Maintain an MSME vendor master that records each supplier’s Udyam number and whether it is a micro or small manufacturer or service provider, hold written payment terms to 45 days or less, track ageing so you clear micro and small dues before the limit, run a year-end review before 31 March to protect your Section 43B(h) deduction, file MSME Form 1 by 30 April and 31 October, and disclose unpaid MSME dues in your financial statements.
How do I identify which of my vendors are MSME?
Ask every vendor for its Udyam registration number at onboarding and verify it on the Udyam portal, which shows the classification as micro, small or medium and the activity type. For the tax and interest consequences you care about the micro and small categories, and only manufacturers and service providers, not traders. Record the status in your vendor master and refresh it once a year, because a vendor’s classification can change.
What if a vendor will not share its Udyam number?
Make it part of onboarding: no Udyam status field completed, no vendor code. If a vendor declares it is not registered as micro or small, keep that written declaration on file, because it explains to your auditor and assessing officer why you did not treat the dues under Section 43B(h). If a vendor refuses to confirm either way, treat the risk conservatively and, where practical, pay within 45 days anyway so you are never exposed.
What are the penalties for a buyer who misses MSME rules?
There are four separate exposures. First, Section 43B(h) disallows the deduction for a late-paid micro or small purchase in the year it was incurred, raising your taxable profit and tax. Second, Section 16 interest at about 19.5% compounded monthly runs automatically and is itself not tax-deductible. Third, missing the half-yearly MSME Form 1 attracts a penalty of about twenty thousand rupees plus one thousand rupees per continuing day. Fourth, an unpaid supplier can file a Samadhaan case, adding cost and reputational damage.
How often must a buyer file MSME Form 1?
MSME Form 1 is a half-yearly return to the Registrar of Companies. It is due by 30 April for the October to March half and by 31 October for the April to September half. A company files it if it owed a micro or small supplier for more than 45 days at any point in the half-year. If even one payment to a supplier breached 45 days in the period, all transactions with that supplier are reported, even those later paid on time.
Does paying MSME vendors on time really save tax?
Yes, directly. Under Section 43B(h) a purchase from a micro or small enterprise is deductible in the year it is incurred only if you pay within the 15 or 45 day limit. There is no grace period up to the return-filing date, unlike the rest of Section 43B. So clearing a micro or small bill before 31 March keeps the deduction in that year, while delaying it pushes the deduction to a later year and inflates this year’s taxable income. Paying on time protects both cash and tax.
Sources: Micro, Small and Medium Enterprises Development (MSMED) Act, 2006, Sections 15, 16, 22 and 23; Income Tax Act 1961, Section 43B(h) (effective AY 2024-25, renumbered Section 37(2)(g) under the Income-tax Act 2025 from Tax Year 2026-27); Companies Act 2013, Section 405 and the Specified Companies Order 2019 (MSME Form 1); revised MSME classification effective 1 April 2025. RBI bank rate and effective interest figures are indicative and move with RBI notifications.
This is general educational information, current to mid-2026, and not legal or tax advice. Rates, forms and procedures change; verify the current position or consult a professional before acting on a specific matter.
AS | Founder, CFOmatrix | Finance Strategy & Equity Compliance CFOmatrix is a knowledge platform focused on how finance actually works inside growing companies. This playbook draws on hands-on experience building payables and vendor-compliance systems, alongside the current statutory and tax position. |