One of the most consequential compliance requirements for businesses buying from MSMEs in India is the 45-day payment rule under the Micro, Small and Medium Enterprises Development (MSMED) Act. Enforced with increasing vigor in 2026, this rule has shifted from a low-priority background regulation to a front-line compliance priority — appearing in income tax scrutiny assessments, statutory audits, and even lending due diligence by banks.

For MSMEs, this rule is a powerful legal weapon that protects your cash flows. For buyers, it is a ticking compliance bomb that, if ignored, results in income tax deduction disallowances, compound interest liabilities, and adverse audit findings. In this comprehensive guide, we explain the full legal framework, enforcement mechanisms, and practical steps for both buyers and MSME sellers to navigate this rule in 2026.

The Legal Foundation – MSMED Act and Section 43B(h)

The 45-day payment rule is governed by two laws working in tandem:

1. MSMED Act, 2006 (Section 16): Establishes the payment timeline obligation and mandates compound interest at 3x RBI bank rate on delayed payments.
2. Income Tax Act (Section 43B(h)): Enforces the financial consequence — expenses payable to registered MSMEs that are delayed beyond the timeline are disallowed as deductions until actual payment is made.

This two-law combination creates both a civil remedy (interest under MSMED Act) and a tax consequence (deduction denial under Income Tax Act) for buyers who delay, making non-compliance expensive from multiple directions simultaneously.

Payment Timelines – What the Law Requires

A critical nuance: the clock starts from the date of acceptance (when the buyer formally accepts the goods/services or is deemed to have accepted them), not the invoice date or the payment terms date. Buyers who base their 45-day count on invoice date rather than acceptance date may inadvertently be in violation.

The Tax Consequence – Section 43B(h) Explained

Section 43B(h) of the Income Tax Act is a deferred deduction rule. Under normal tax accounting, expenses incurred are deductible in the year they are accrued (regardless of when paid). Section 43B(h) creates an exception for MSME payables:

• If you owe money to a registered Micro or Small Enterprise and haven’t paid within the prescribed timeline (45 days with agreement, 15 days without), the expense is not deductible in the accrual year
• The deduction is only permitted in the financial year in which actual payment is made
• This timing difference increases your taxable income and tax liability in the current year
• Additionally, the compound interest you owe on delayed payments is itself not tax-deductible, further compounding the financial penalty

Example: A buyer purchases raw materials worth ₹50 lakh from a registered MSME on June 1, 2026. The invoice is accepted on June 5. The 45-day deadline falls on July 20. If payment is made on September 1 (72 days late), the buyer cannot deduct ₹50 lakh in FY 2026-27 books — it will only be deductible in the year of actual payment. Additionally, interest accrues on ₹50 lakh at 3x RBI bank rate for 53 days, which is non-deductible.

Enforcement Intensification in 2026

The MSME payment rule has moved from theoretical compliance to active enforcement in 2026. Here is how it manifests in the real world:

Income Tax Scrutiny

Assessing Officers are now specifically asking buyers about their payment cycles to MSME vendors during income tax scrutiny assessments. Form 3CD (Tax Audit Report) under Clause 22 explicitly requires auditors to report:

• The amount of outstanding payments to MSMEs beyond the prescribed period
• The interest amount due but unpaid
• Details of payments delayed and subsequently made

This means your statutory auditor is legally required to flag MSME payment delays, regardless of whether the buyer voluntarily discloses them. Hiding this information is an auditor ethics violation.

Statutory Audit Findings

Chartered Accountants conducting statutory audits of companies and firms are adding specific MSME payment compliance tests to their audit programs. Companies with material delayed MSME payables are receiving audit qualifications or emphasis of matter paragraphs, which affects their financial credibility with banks and investors.

MSME Samadhaan Portal

The government’s MSME Samadhaan portal allows registered MSMEs to file delayed payment complaints online. Once filed, the matter is referred to the Micro and Small Enterprises Facilitation Council (MSEFC) for adjudication. The Council can issue orders for payment with compound interest, and non-compliance with Council orders can result in court proceedings.

For MSME Sellers – How to Use This Rule to Protect Your Business

The 45-day rule gives MSMEs significant legal leverage in commercial relationships. Here is how to maximize its protection:

1. Ensure Udyam Registration: This rule protects only Udyam-registered Micro and Small Enterprises. If you haven’t registered, do it immediately at TaxMSME’s Udyam Registration page. Registration is free, paperless, and takes 24–48 hours.
2. Include the Rule in Contracts: Every supply agreement should explicitly reference the MSMED Act payment obligation and the 45-day limit. Do not rely on verbal understandings.
3. Track Acceptance Dates: Maintain a register of delivery dates, acceptance dates, and payment due dates for all buyers. Many buyers manipulate payment timelines by delaying formal acceptance.
4. Invoice Promptly: Issue tax invoices immediately upon delivery or service completion. Delayed invoicing shortens the effective credit period available to you.
5. Send Payment Reminders at Day 30: Don’t wait until Day 45 to chase overdue payments. Set up automated payment reminders at Day 30 and Day 40 to give buyers enough time to comply before the deadline triggers legal consequences.
6. File on Samadhaan if Delayed: If payment is not received within 45 days, file a complaint on the MSME Samadhaan portal. This creates a formal legal record and often prompts buyers to pay quickly to avoid audit findings.

For Buyers – How to Achieve and Maintain Compliance

1. Verify Vendor MSME Status: Build a process to check Udyam Registration status for all vendors before onboarding. Request Udyam certificates as part of vendor KYC documentation.
2. Track Acceptance Dates, Not Invoice Dates: Update your accounts payable system to flag MSME invoices and count the payment deadline from the acceptance/delivery date.
3. Prioritize MSME Payment Runs: Create a separate priority payment cycle specifically for MSME vendors to ensure they are paid within 45 days regardless of your standard 60/90-day payment terms.
4. Establish Written Agreements: All MSME vendor contracts should specify clear payment terms not exceeding 45 days. Without a written agreement, the default is 15 days — far more restrictive.
5. Use TReDS: Onboarding on a TReDS platform allows MSME suppliers to access funds immediately while you maintain your payment terms. This effectively eliminates the 45-day compliance pressure by decoupling the MSME’s cash need from your payment cycle.

Conclusion

The MSME 45-day payment rule, combined with Section 43B(h) of the Income Tax Act, creates a powerful legal and financial framework that demands compliance from all buyers. In 2026, with enforcement through tax audits, statutory reporting, and the Samadhaan portal, ignoring this rule is increasingly costly. For MSMEs, it provides genuine legal protection and leverage against large buyers who historically exploited their payment terms.

At TaxMSME, we help MSMEs get Udyam-registered, maintain compliant invoice records, and file delayed payment complaints when needed. We also assist buyers in reviewing and aligning their accounts payable processes with MSMD Act requirements. Contact our team today for a payment compliance audit and protect your business from both sides. Explore our Udyam Registration and MSME financial services.