Written by the CA & Income Tax Advisory Team, Rudra Capital — advising businesses on Section 43B compliance, MSME vendor management, income tax audits, and Form MSME-1 filings across Delhi NCR. We have helped over 200 companies restructure their MSME payment processes following the April 2023 amendment.
Last reviewed: June 2026 | References: Section 43B(h) Income Tax Act 1961 (inserted by Finance Act 2023) · MSMED Act 2006 (Sections 2, 15, 16) · UDYAM Registration Rules 2020 · Form MSME-1 MCA Notification 2019 · CBDT Circular on Section 43B applicability
Covers: What Section 43B(h) is · Who qualifies as MSME · 45-day rule mechanics · Tax disallowance calculation · UDYAM registration essentials · Form MSME-1 returns · Vendor payment management · Impact on large companies · What auditors check · 8 FAQs with Rich Snippet schema
From FY 2023-24 onwards, every business that purchases goods or services from a Micro or Small Enterprise faces a new and potentially very expensive income tax compliance obligation — one that most finance teams only discovered during their tax audit for FY 2023-24.
Section 43B(h), inserted into the Income Tax Act 1961 by the Finance Act 2023, creates a simple but powerful rule: if you buy goods or services from a registered MSME supplier and do not pay within the timeframes prescribed by the MSMED Act (generally 45 days), you cannot deduct that expense in the year you accrued it. The deduction is available only in the year you actually make the payment — potentially pushing the tax benefit one or more years into the future, increasing your taxable income and tax liability for the current year.
This is not a penalty. It is a deduction timing shift — but its financial impact on businesses with large MSME vendor bases can be substantial. And unlike most compliance gaps, this one cannot be fixed retrospectively by filing a correction return. The damage to the current year’s tax computation is done the moment a payment crosses the 45-day window.
The critical number to remember: If you have not paid an MSME supplier within 45 days of accepting the goods or services (or 15 days if no written agreement specifies a credit period), the entire outstanding amount is disallowed as a deduction in your income tax return for that year. Disallowance restores only when you actually pay — which could be in the following financial year.
What Is Section 43B(h)? The Legal Framework
Section 43B of the Income Tax Act lists categories of expenditure that are deductible only on actual payment basis — regardless of the accounting method used by the assessee. Historically, Section 43B covered provident fund contributions, gratuity, bonus, interest on government loans, and leave encashment. The Finance Act 2023 inserted a new clause (h):
Section 43B(h) — Verbatim Effect
“Any sum payable by the assessee to a Micro or Small Enterprise beyond the time limit specified in Section 15 of the Micro, Small and Medium Enterprises Development Act, 2006 shall be allowed as a deduction only in the previous year in which such sum is actually paid.”
Effective from: April 1, 2023 (applicable from Assessment Year 2024-25, i.e., FY 2023-24 onwards)
Key phrase: “Micro or Small Enterprise.” Section 43B(h) applies only to payments to Micro and Small enterprises. It does NOT apply to payments to Medium enterprises. This distinction is critical — a supplier’s MSME registration certificate must be checked to confirm whether they are Micro, Small, or Medium before applying Section 43B(h).
Who Qualifies as a Micro or Small Enterprise Under the MSMED Act 2006?
The definition of Micro and Small enterprises under the MSMED Act 2006 was revised by the Aatmanirbhar Bharat notification in June 2020. The current classification (based on investment in plant & machinery/equipment AND annual turnover) is:
| Enterprise Category | Investment in Plant & Machinery | Annual Turnover | Section 43B(h) Applies? |
|---|---|---|---|
| Micro Enterprise | Up to ₹1 crore | Up to ₹5 crore | YES |
| Small Enterprise | Up to ₹10 crore | Up to ₹50 crore | YES |
| Medium Enterprise | Up to ₹50 crore | Up to ₹250 crore | NO — Section 43B(h) does NOT apply |
The supplier classification trap: Your supplier’s classification as Micro or Small is determined by their own investment and turnover — which may change year-to-year. A supplier who was a Small enterprise when you signed the contract may have crossed the ₹10 crore investment threshold and upgraded to Medium — in which case Section 43B(h) no longer applies to payments to them. Conversely, a new supplier you assumed was unregistered may be a UDYAM-registered Micro enterprise. Verify every significant MSME vendor’s UDYAM registration and current category annually.
Need help auditing your MSME vendor base for Section 43B(h) compliance? Call our CA experts for a free assessment · +91-9953572838
The 45-Day Rule Explained — Section 15 of the MSMED Act
Section 43B(h) ties to Section 15 of the MSMED Act, which prescribes specific payment timelines that buyers must follow when purchasing from MSMEs:
Scenario A — No Written Agreement
15 Days
Payment must be made within 15 days of acceptance (or deemed acceptance) of goods or services. No written contract, no agreed credit period, no invoice terms — 15 days is the hard limit.
Scenario B — With Written Agreement
45 Days
If there is a written agreement specifying a credit period, payment must be made within that period — subject to a maximum of 45 days from acceptance of goods/services. An agreed 60-day or 90-day credit term is legally void for Micro and Small suppliers; the effective limit remains 45 days.
What is “acceptance”? The MSMED Act uses “acceptance” as the trigger date, not the invoice date. Acceptance is the date the buyer acknowledges receipt of goods or services — not the date of invoice. If goods are delivered on the 1st but inspection and acceptance happens on the 5th, the clock starts on the 5th. If the buyer does not formally reject the goods within 15 days of delivery, they are deemed accepted on the 15th day from delivery — starting the payment clock.
In practice, most finance teams track payment deadlines from the invoice date — which may differ from the acceptance date. For Section 43B(h) compliance, the acceptance date is the legally relevant trigger.
Tax Disallowance Under Section 43B(h) — How It Is Calculated
The disallowance mechanics under Section 43B(h) operate as follows at the end of each financial year:
Step-by-Step Disallowance Calculation (as on March 31)
1
List all purchases from Micro and Small MSME suppliers (verified UDYAM-registered) during FY 2025-26 that are still outstanding (unpaid) as on March 31, 2026
2
For each outstanding invoice, check whether the acceptance date was more than 45 days before March 31, 2026
3
Any amount outstanding and overdue beyond 45 days is disallowed — added back to taxable income for FY 2025-26. The disallowed amount is taxed at your applicable corporate rate.
4
When you actually pay the MSME supplier in FY 2026-27 (or a later year), the deduction is allowed in that year’s tax return — restoring the benefit, but one year late.
Worked Example — FY 2025-26
MSME Outstanding Invoices (as on March 31, 2026)
₹18,40,000
Across 7 Micro and Small suppliers — accepted 50–90 days prior to March 31
Additional Tax Payable (FY 2025-26)
~₹4,60,000
At 25% effective tax rate. Fully recoverable in FY 2026-27 when payment is made.
Note: This is not a penalty or a permanent tax. It is a deduction timing shift. But ₹4.6 lakh of additional tax paid now affects working capital, and the “recovery” comes only in the following year’s assessment.
UDYAM Registration — Why It Matters for Both Buyers and MSME Sellers
Section 43B(h) applies only to payments to registered Micro and Small enterprises — specifically those with a valid UDYAM Registration Certificate issued by the Ministry of MSME. An unregistered supplier, regardless of their actual size, does not trigger Section 43B(h) obligations.
This creates an important compliance workflow for buyers:
- Vendor onboarding: For every new supplier, ask for their UDYAM Registration Certificate. Record the UDYAM number and enterprise category (Micro or Small) in your vendor master. If the supplier is unregistered, document this — Section 43B(h) does not apply, but the lack of documentation creates a gap if the tax department queries your MSME vendor payments.
- Annual re-verification: MSME classification changes when a business’s investment or turnover crosses a threshold. Re-verify all MSME vendor certificates at the beginning of each financial year. An upgraded-to-Medium supplier no longer triggers Section 43B(h); a newly registered Micro supplier now does.
- UDYAM portal verification: UDYAM certificates can be verified at udyamregistration.gov.in. The certificate shows the enterprise name, UDYAM number, and category. Download and retain a copy in your records for each financial year.
For MSME suppliers: UDYAM registration is not just a government compliance formality — it directly affects whether your buyers pay you on time. Large corporate buyers who are tracking Section 43B(h) will actively prioritise payment to UDYAM-registered Micro and Small vendors to avoid tax disallowance. An MSME supplier without UDYAM registration is inadvertently allowing their buyers to delay payment without income tax consequences. Registering on UDYAM is free, takes 30 minutes, and gives you legal leverage under the MSMED Act.
Need UDYAM registration or Section 43B(h) compliance review? Require this service — call our experts today · +91-9953572838
Form MSME-1 — Half-Yearly Return for Companies With Outstanding MSME Dues
Beyond the income tax compliance under Section 43B(h), companies — both Private Limited and Public Limited — with MSME vendors have a separate MCA filing obligation: Form MSME-1, a half-yearly return disclosing outstanding payments to Micro and Small enterprises that are overdue for more than 45 days.
Who must file Form MSME-1? Every company (not LLPs or partnerships) that has received goods or services from a Micro or Small enterprise and has outstanding dues exceeding 45 days as on the relevant date.
| Half-Year Period | Outstanding as on | Due Date for Form MSME-1 |
|---|---|---|
| April 1 to September 30 | September 30 | October 31 |
| October 1 to March 31 | March 31 | April 30 |
Form MSME-1 must be filed on the MCA portal. It discloses: the name and address of MSME suppliers with overdue payments, the amount outstanding, and the reason for delay. Filing is mandatory even if the overdue amount has been paid before the Form MSME-1 due date — if it was outstanding as on the relevant date (March 31 or September 30), it must be disclosed.
Penalty for non-filing of Form MSME-1: Under Section 405 of the Companies Act, ₹25,000 minimum penalty for the company, plus ₹25,000 per officer in default. Non-filing during statutory audits also creates a qualification basis for auditors who are required to verify MSME payment compliance as part of their audit procedures.
How to Manage MSME Vendor Payments — Practical Strategies for Finance Teams
The operational response to Section 43B(h) requires changes to your accounts payable process — not just a once-a-year tax adjustment. Here are the most effective strategies that finance teams across India’s mid-market are implementing in 2025:
Strategy 1 — Tag MSME status in your vendor master
Add a field to your accounting software or ERP for “UDYAM Status” (Micro/Small/Medium/Unregistered) and “UDYAM Certificate Number.” Tag each vendor. Configure your system to flag invoices from Micro and Small vendors that approach the 40-day mark without payment — giving your team 5 days to process before the 45-day limit.
Strategy 2 — Run a weekly MSME overdue report
Every Monday, your accounts payable team should generate a report of all MSME invoices outstanding for 30+ days. Any approaching the 45-day mark gets priority processing. This weekly cadence prevents end-of-quarter surprises and distributes payment processing evenly rather than creating a payment crunch in late March.
Strategy 3 — Negotiate payment terms upfront in writing
Section 43B(h)’s 45-day maximum applies even to agreed contractual terms. However, having a written agreement (purchase order with 45-day payment terms) is better than no agreement (15-day default). Ensure all MSME supplier contracts explicitly state payment terms and include the acceptance date tracking mechanism.
Strategy 4 — March year-end sweep
In the third week of March each year, run a full audit of all MSME payables. Any invoice accepted before February 15 (45 days before March 31) that remains unpaid is at risk of Section 43B(h) disallowance. Make a bulk payment run specifically for these invoices before March 31 to restore the tax deduction for FY 2025-26.
Strategy 5 — Align annual tax planning with MSME payment review
In February or March each year, have your CA run the Section 43B(h) disallowance calculation as part of pre-year-end tax planning. If the disallowance amount is large, you have time to make bulk payments before March 31 and restore the deduction, rather than discovering the impact only when filing the ITR in October.
What Auditors Check Under Section 43B(h) — The Statutory Audit Implications
From FY 2023-24 onwards, statutory auditors in India are required by ICAI guidance and the Companies Auditing Standards to include Section 43B(h) compliance as a specific audit procedure. During the annual statutory audit, your auditor will:
- Request a list of all vendor payments classified as MSME (Micro and Small) with their UDYAM registration details
- Test-check invoice acceptance dates against payment dates to verify 45-day compliance
- Verify that the outstanding MSME dues as on the balance sheet date have been correctly assessed for Section 43B(h) disallowance in the tax computation
- Check that Form MSME-1 has been filed for both half-years with accurate disclosure
- In the tax audit report (Form 3CD, Clause 26), specifically report the amount of Section 43B disallowance including the Section 43B(h) component
If your accounting records do not have UDYAM status tagging for vendors, MSME invoice tracking, or acceptance date records, the statutory audit will reveal this gap — typically during the busy October-November audit season when there is no time to reconstruct the data cleanly. Building these records in real time throughout the year is far easier than reconstructing them under audit pressure.
Common Section 43B(h) Mistakes Businesses Are Making in 2025
Mistake 1 — Assuming Section 43B(h) applies to ALL MSME suppliers including Medium enterprises
Section 43B(h) applies only to Micro and Small enterprises — not Medium. A supplier with turnover up to ₹250 crore classified as Medium is not subject to this provision. Verify every vendor’s exact UDYAM category.
Mistake 2 — Tracking payment deadlines from invoice date instead of acceptance date
The MSMED Act and Section 43B(h) use acceptance date as the trigger — not invoice date. If goods are inspected and accepted 7 days after delivery, the 45-day clock starts on the acceptance date. Using invoice date overstates your time available and may result in inadvertent disallowance.
Mistake 3 — Not filing Form MSME-1 because the overdue amount was paid before the filing date
Form MSME-1 is triggered by outstanding dues as on the reference date (March 31 or September 30) — even if those dues were paid between the reference date and the Form MSME-1 due date. Many companies skip the filing because they paid in April, not realising the March 31 position still requires disclosure.
Mistake 4 — Treating the disallowance as a permanent tax cost and not claiming the deduction in the payment year
Section 43B(h) disallowance is a timing difference — not a permanent disallowance. When you pay the MSME supplier in FY 2026-27, the deduction is available in that year’s return. Many businesses lose this “recovery” by not tracking what was disallowed in the prior year and therefore not specifically claiming the deduction in the payment year’s ITR.
Require help with Section 43B(h) compliance review, MSME vendor audit, Form MSME-1 filing, or tax planning for MSME payments? Call our CA experts for an assessment · +91-9953572838
Impact on Large Companies — Why This Is a Boardroom-Level Issue
For mid-to-large companies with extensive MSME vendor bases, Section 43B(h) is not merely an accounts payable housekeeping issue — it has material impact on financial reporting, tax provisioning, and working capital planning. Here is why it escalates to CFO and board attention:
- Tax provisioning impact: A large manufacturing company with ₹50 crore in annual MSME purchases and poor payment timing could face ₹5–8 crore in additional tax provisioning each year — enough to materially affect quarterly financial results under Ind AS.
- Audit committee scrutiny: Statutory auditors and audit committees now specifically review MSME payment processes as part of internal controls review. Inadequate vendor classification systems and payment tracking raise internal control deficiency findings.
- Due diligence in M&A: Acquirers and investors now include Section 43B(h) compliance in their tax due diligence scope. A target company with ₹10 crore of Section 43B(h) disallowance that was never claimed as a recovery deduction represents a tax liability that affects the deal valuation.
- Supply chain relationships: Section 43B(h) creates a direct financial incentive for large buyers to pay their Micro and Small suppliers faster. This is intentional — the provision was designed by Parliament to address the systemic problem of large corporates delaying payments to small suppliers, which has historically caused significant MSME cash flow distress.
The policy intent behind Section 43B(h) is clear: align the tax incentive structure with the MSMED Act’s payment obligations. For decades, large companies could freely delay MSME payments without immediate consequences. Section 43B(h) changes that calculus fundamentally — delayed payment now has an immediate and quantifiable income tax cost for the buyer.
Is your business compliant with Section 43B(h) for FY 2026-27?
Rudra Capital’s CA team provides end-to-end Section 43B(h) compliance — MSME vendor audits, UDYAM registration assistance, Form MSME-1 filing, disallowance calculation, and year-end payment planning to minimise tax exposure for companies across Delhi NCR.
+91-9953572838 | Book a Free Section 43B(h) Compliance Review →
FAQs — Section 43B(h) MSME 45-Day Payment Rule India
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