Section 43B of Income Tax Act for MSME:The Complete 45-Day Payment Rule Guide
If your business buys goods or services from small suppliers in India, one tax provision now directly affects your bottom line: Section 43B(h) of the Income Tax Act. Introduced through the Finance Act, 2023, this clause links your ability to claim a tax deduction to how quickly you pay your Micro and Small Enterprise (MSE) vendors. This matters because a single missed deadline can push a legitimate business expense out of this year's tax computation and into next year's — inflating your current taxable income in the process. This guide is written for business owners, finance managers, chartered accountants, startup founders, and procurement teams who deal with MSME suppliers and want to stay compliant without last-minute surprises at year-end closing. By the end of this article, you will understand what Section 43B(h) says, who it applies to, how the 15-day and 45-day timelines work, what documents and processes you need, common mistakes businesses make, and how the rule continues under the new Income-tax Act, 2025.
Why is Section 43B(h) Important?
It protects MSME cash flow
Delayed payments are one of the biggest survival challenges for small businesses in India. This clause gives larger buyers a direct financial incentive to pay on time.
It affects your tax liability directly
Unpaid dues to MSEs at year-end get added back to your taxable income, increasing the tax you owe for that year.
It changes vendor negotiation dynamics
MSEs now have stronger footing to insist on the 45-day cap, since buyers have their own reason to comply.
It is scrutinized during tax audits
Auditors specifically check MSME payables while preparing Form 3CD, making this a recurring compliance checkpoint, not a one-time filing.
It continues under the new tax law
The Income-tax Act, 2025, which came into force on April 1, 2026, carries the same rule forward (as Section 37(2)(g)) for Tax Year 2026-27 onward, so this is not a temporary rule.
Costs, Fees, or Charges
How Does Section 43B(h) Work?
Identify Udyam-Registered Micro and Small Suppliers
Segregate your vendor ledger by Udyam registration status. Ask every supplier to share their Udyam Registration Certificate and classification (Micro, Small, or Medium).
Check Whether a Written Payment Agreement Exists
If there is a written agreement specifying a payment period, that period applies but it cannot exceed 45 days, even if the agreement states a longer term (say, 60 or 90 days). If no written agreement exists, the default limit is 15 days.
Check Whether a Written Payment Agreement Exists
If there is a written agreement specifying a payment period, that period applies but it cannot exceed 45 days, even if the agreement states a longer term (say, 60 or 90 days). If no written agreement exists, the default limit is 15 days.
Calculate the Due Date From the Acceptance Date
The due date is:
15 days from the date of acceptance (no agreement), or
The date specified in the agreement or 45 days from acceptance, whichever is earlier (with agreement)
Make the Payment Within the Applicable Window
If payment is made within the 15-day or 45-day window, the expense is fully deductible in the same financial year in which it was incurred no special adjustment needed.
Track Late Payments and Adjust Tax Computation
If payment crosses the deadline and remains unpaid as on March 31, the amount must be added back to taxable income for that financial year. It becomes deductible only in the year it is actually paid this holds true even if you pay before filing your tax return, since Section 43B(h) does not carry the usual "pay before return due date" relief available to other Section 43B items.
Identify Udyam-Registered Micro and Small Suppliers
Segregate your vendor ledger by Udyam registration status. Ask every supplier to share their Udyam Registration Certificate and classification (Micro, Small, or Medium).
Check Whether a Written Payment Agreement Exists
If there is a written agreement specifying a payment period, that period applies but it cannot exceed 45 days, even if the agreement states a longer term (say, 60 or 90 days). If no written agreement exists, the default limit is 15 days.
Check Whether a Written Payment Agreement Exists
If there is a written agreement specifying a payment period, that period applies but it cannot exceed 45 days, even if the agreement states a longer term (say, 60 or 90 days). If no written agreement exists, the default limit is 15 days.
Calculate the Due Date From the Acceptance Date
The due date is:
15 days from the date of acceptance (no agreement), or
The date specified in the agreement or 45 days from acceptance, whichever is earlier (with agreement)
Make the Payment Within the Applicable Window
If payment is made within the 15-day or 45-day window, the expense is fully deductible in the same financial year in which it was incurred no special adjustment needed.
Track Late Payments and Adjust Tax Computation
If payment crosses the deadline and remains unpaid as on March 31, the amount must be added back to taxable income for that financial year. It becomes deductible only in the year it is actually paid this holds true even if you pay before filing your tax return, since Section 43B(h) does not carry the usual "pay before return due date" relief available to other Section 43B items.
Key Requirements, Eligibility, or Criteria
Requirement 1: The Supplier Must Be a Registered Micro or Small Enterprise
Section 43B(h) applies only when the supplier is registered under the MSMED Act, 2006 (typically via Udyam Registration), and classified as Micro or Small. Medium enterprises are excluded from this specific clause.
Micro: investment in plant & machinery up to ₹1 crore, turnover up to ₹5 crore
Small: investment up to ₹10 crore, turnover up to ₹50 crore
Medium: investment up to ₹50 crore, turnover up to ₹250 crore (not covered by 43B(h))
Requirement 2: The Buyer's Own Registration Is Not Required
You do not need to be registered under the MSMED Act yourself for this clause to apply to your payables. The obligation is triggered purely by your supplier's registration status.
Requirement 3: The Transaction Must Be for Goods or Services (Not Trading Stock Resale by Traders)
The rule applies to enterprises that manufacture goods or provide services and are Udyam-registered. Traders (wholesale or retail) are generally excluded, since trading activity itself does not qualify for Udyam registration as a manufacturer/service provider.
Requirement 4: Payment Timelines Must Be Tracked From the Date of Acceptance
The clock starts from the date goods or services are accepted, or deemed accepted, by the buyer not the invoice date or order date. This makes accurate receipt/acceptance tracking essential for compliance.
Documents Required
Udyam Registration Certificates
Of all suppliers, updated periodically
Written agreements or purchase orders
Specifying payment terms with each MSE vendor
Goods Receipt Notes (GRN) or service acceptance records
With clear acceptance dates
Payment proofs
Such as bank transfer confirmations (UTR/NEFT/RTGS references) matched to specific invoices
Vendor master data
Tagged by MSME classification (Micro/Small/Medium/Unregistered)
Ageing reports
Showing outstanding payables by day-bucket (0–15 days, 15–45 days, 45+ days)
Form MSME-1
(For companies), a half-yearly return disclosing outstanding dues to micro and small suppliers beyond 45 days, filed with the Ministry of Corporate Affairs
Benefits of Section 43B(h)
Benefit 1: Improved Cash Flow for MSMEs
Small businesses often operate on thin working capital margins. Timely payments mean they can meet payroll, buy raw materials, and reinvest in operations without relying on expensive short-term credit.
Benefit 2: Stronger Bargaining Position for Small Suppliers
MSEs can negotiate payment terms with more confidence, knowing buyers have a tax-linked incentive to honor the 45-day cap rather than push for extended credit periods.
Benefit 3: Better Financial Discipline for Buyers
Companies are compelled to build robust accounts payable tracking systems, which often improves overall vendor management and reduces the risk of disputes over unpaid dues.
Benefit 4: Reduced Litigation and Payment Disputes
When payments are made on schedule, the number of disputes, legal notices, and MSME Facilitation Council references drops significantly, saving both parties time and legal costs.
Benefit 5: Long-Term Ecosystem Strengthening
By formalizing timely payment as standard practice, the provision contributes to a healthier business environment where MSMEs a major contributor to India's GDP and employment can grow more predictably.
Common Mistakes to Avoid
Mistake 1: Assuming a Longer Contractual Term Overrides the 45-Day Cap
Many businesses sign agreements with 60- or 90-day credit terms, assuming this protects them. It does not. Section 15 of the MSMED Act caps the maximum period at 45 days regardless of what the agreement says.
Mistake 2: Not Verifying Udyam Registration Status
Businesses often assume a supplier is "just a small vendor" without checking actual Udyam registration. Since the rule applies only to registered Micro and Small enterprises, verifying this status is essential before assuming (or dismissing) applicability.
Mistake 3: Tracking Due Dates From the Invoice Date Instead of Acceptance Date
The clock legally starts from the date of acceptance (or deemed acceptance) of goods/services, which can differ from the invoice date, especially where goods are inspected before formal acceptance.
Mistake 4: Ignoring the Rule Because "We'll Pay Before Filing the Return"
Unlike most other items under Section 43B, clause (h) has no relief for payment made before the income tax return filing due date. Missing the MSMED timeline pushes the deduction to the year of actual payment, full stop.
Section 43B(h) vs. Other Clauses of Section 43B
Latest Updates, Rules, or Regulations
Finance Act, 2023
Finance Act, 2023 inserted clause (h) into Section 43B, effective April 1, 2024, applicable from Assessment Year 2024-25.
Income-tax Act, 2025
Income-tax Act, 2025, which came into force on April 1, 2026, has carried forward this rule under Section 37(2)(g) for Tax Year 2026-27 onward. The substance of the rule payment discipline tied to tax deduction is unchanged; only the section numbering has been updated.
FY 2025-26
For FY 2025-26 (the last full year governed by the 1961 Act), businesses continue to apply Section 43B(h) as before, with the tax audit and return for this year computed under the old numbering even though filings happen after the new Act takes effect.
Ongoing case law
Ongoing case law (before various Income Tax Appellate Tribunals) continues to clarify edge cases, such as situations where a buyer's or supplier's registration status changes mid-transaction. Businesses with complex or borderline cases should consult a tax professional for the latest judicial interpretation.
FAQs
What is Section 43B(h) of the Income Tax Act?
Section 43B of the Income Tax Act, 1961, is a long-standing provision that allows certain business expenses as deductions only when they are actually paid, not merely when they are recorded in the books (regardless of whether you follow cash or mercantile accounting). It traditionally covered items like statutory taxes, employer contributions to provident funds, bonuses, and interest on loans from banks or financial institutions.
Clause (h) was added to this list through the Finance Act, 2023, and came into effect from April 1, 2024 (applicable from Assessment Year 2024-25 onwards, covering payments made from FY 2023-24). It states that:
Any sum payable by a business to a Micro or Small Enterprise for goods supplied or services rendered will be allowed as a deduction only in the year it is actually paid if the payment is not made within the time limit specified under Section 15 of the MSMED Act, 2006.
In simple terms: pay your registered MSE vendor on time, and you get the deduction in the same financial year. Pay late, and the deduction is pushed to whichever year you finally pay.
This provision is commonly used in year-end tax planning, tax audit reporting (Form 3CD), and vendor payment scheduling by companies, LLPs, partnership firms, and proprietorships that transact with small suppliers.
Read Also: MSME Tax
Conclusion
Section 43B(h) has fundamentally changed how businesses need to manage payments to their Micro and Small Enterprise suppliers. The core takeaway is simple: pay on time, or lose the deduction for the year. With no relief window before return filing, the compliance bar here is stricter than for other items under Section 43B.
The most important next step for any business dealing with MSME vendors is to build a reliable system verifying Udyam registration, tracking acceptance dates, and monitoring payment ageing so that year-end tax computation doesn't come with unwelcome surprises. If your payables to MSME vendors are complex or span multiple financial years, it's worth consulting a chartered accountant to review your specific exposure before your next tax filing.
This article is for general informational purposes and does not constitute tax or legal advice. Please consult a qualified chartered accountant or tax professional for guidance specific to your business.
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