The MSME 45-Day Rule: What Finance Teams Need to Know About Section 43B(h)

Author : purchase pro | Published On : 25 Sep 2026

If your company buys from small suppliers, manufacturers, job workers or service providers registered under the MSMED Act, there is a payment rule that directly affects your income-tax deduction.

Section 43B(h) of the Income Tax Act, effective from FY 2023-24, says that certain amounts owed to Micro or Small enterprises under the MSMED Act can be claimed as a tax deduction only in the year the amount is actually paid, where the applicable MSMED Act payment timeline has not been met.

The relevant payment timelines come from Section 15 of the MSMED Act.

For finance teams, this makes MSME payment compliance more than a routine accounts-payable activity. The payment deadline can affect when the related expense is deductible.

 

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Quick Answer

The MSME 45-day rule requires eligible buyers to pay Micro or Small enterprise suppliers within the agreed period, subject to the applicable MSMED Act limit. With a written agreement, the period cannot exceed 45 days from acceptance; without one, payment is generally required within 15 days. Section 43B(h) can affect the timing of the buyer's tax deduction when payment is delayed.

 

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What Is the MSME 45-Day Payment Rule?

The MSME payment rule is linked to the payment timelines under Section 15 of the MSMED Act.

There are two situations to understand.

If There Is a Written Agreement

If there is a written agreement with the supplier, payment must be made within the agreed period, subject to a maximum of 45 days from acceptance of the goods or services.

If There Is No Written Agreement

Where there is no written agreement, payment must generally be made within 15 days from acceptance.

The important point is that the payment clock does not simply begin with the invoice date.

It starts with acceptance.

 

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When Does the MSME Payment Clock Start?

Day 0 is the date of acceptance of the goods or services.

It is not automatically:

• The invoice date

• The invoice receipt date

• The delivery date

The relevant starting point is the date the goods or services are accepted or deemed accepted under the applicable framework.

This distinction matters because an accounts payable team that starts counting from the wrong date may misunderstand how much time remains.

For finance teams, accurately capturing the acceptance date should therefore be part of the payment process.

 

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What Happens If an MSME Payment Is Made After 45 Days?

The tax impact can be significant.

The source article gives this example:

If a company owes ₹50 lakh to an MSME supplier and pays on day 50 instead of day 45, the entire ₹50 lakh is disallowed as a deduction for that financial year under the scenario described.

At a 25% tax rate, that represents ₹12.5 lakh of additional tax in that year.

The expense is not permanently lost. It becomes deductible in the year in which it is actually paid, subject to the applicable tax provisions. However, the timing difference can create a real cash-flow impact.

This is why MSME payment compliance needs to be treated as a finance control rather than simply a payment-cycle issue.

 

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Three Patterns That Make MSME Compliance Easy to Miss

The rule itself is relatively straightforward.

The operational challenge is identifying the suppliers and transactions that fall within it and monitoring the correct deadline.

1. Hidden MSME Status

A supplier who was not an MSME when initially onboarded may become one later.

MSME registration is the supplier's responsibility, but the buyer needs sufficient supplier information to identify the applicable payment requirement.

The source article recommends periodic vendor-master updates to catch changes in MSME status.

For finance teams, the practical requirement is simple:

Keep MSME status visible and current in the vendor master.

 

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2. Invoice Date vs. Acceptance Date

This is one of the most important operational points.

Many AP teams may instinctively start the payment clock from invoice receipt or the invoice date.

But the relevant clock starts from acceptance.

Acceptance can happen after delivery if goods need to be inspected before being accepted. It can also happen before the formal invoice arrives.

If the wrong date is used consistently, the business may believe it has more time than it actually does.

 

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3. Year-End Bunching

Timing becomes particularly important when an MSME payable crosses a financial year.

For example, an MSME payable that should have been paid in February but is paid in April crosses the financial year.

The related deduction can therefore move into the subsequent year, creating a difference in taxable income for the previous year and, as described in the source article, potentially triggering interest under Section 234B.

This is why finance teams should not wait until year-end to identify approaching MSME payment deadlines.

 

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How Should Finance Teams Manage MSME Payments?

The practical defence is to create a payment-priority process that clearly distinguishes MSME vendors from other suppliers.

Tag MSME Status in the Vendor Master

MSME status should be recorded in the vendor master and kept updated.

The status should also be visible to accounts payable teams when they process invoices so that applicable payment timelines can be treated differently from standard supplier terms.

This creates a simple operational distinction:

Standard supplier → Standard payment workflow

MSME supplier → MSME payment timeline

 

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Override Standard Payment Terms for MSME Vendors

An ERP or procurement system may contain standard terms such as net 60 or net 90.

For MSME suppliers, the applicable MSMED Act timeline needs to take precedence where the law applies.

The source article recommends enforcing the shorter timeline for tagged MSME vendors instead of relying on AP teams to remember the rule manually.

This reduces dependence on individual memory.

 

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Run a Weekly MSME Payables Ageing Report

A weekly MSME payment tracking process can help finance teams identify invoices that are approaching the deadline.

The source article recommends escalating an MSME invoice approaching day 40 for immediate attention, regardless of the organisation's standard payment cycle.

A dedicated procurement reports software workflow can make this type of reporting easier to manage when purchasing and payment information are already captured digitally.

The objective is not to wait until day 45.

The objective is to know which invoices are approaching the deadline early enough to act.

 

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How MSME Payment Tracking Software Can Help

For organisations handling a large number of suppliers, manually identifying MSME invoices and calculating payment deadlines can become difficult.

This is where msme payment tracking software becomes relevant.

A structured workflow can help finance teams keep track of:

• MSME supplier status

• Invoice creation

• Acceptance date

• Payment ageing

• Approaching deadlines

• Overdue MSME payables

• Exceptions requiring attention

The key information needs to remain connected.

Supplier → MSME Status → Invoice → Acceptance Date → Payment Deadline → Payment Status

That relationship gives finance teams a clearer view of where compliance attention is required.

 

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How PurchasePro Helps With MSME Payment Compliance

PurchasePro's supplied workflow identifies MSME vendors at invoice creation, tracks the acceptance date rather than the invoice date as the starting point for the payment clock, and surfaces overdue MSME payables through a dedicated exception report.

The purpose is to make the Section 43B(h) exposure visible before it becomes a year-end issue.

For businesses evaluating msme 45 day payment compliance software, the important workflow elements are:

• Identify MSME vendors

• Track the correct acceptance date

• Monitor payment ageing

• Highlight approaching deadlines

• Surface overdue MSME payables

• Give finance teams an exception view

The tracked PurchasePro keyword msme 45 day payment compliance software is mapped to the PurchasePro MSME page, while msme payment tracking software is also mapped to that page.

 

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Why MSME Payment Compliance Should Be a Finance Control

The 45-day rule is not simply about whether an invoice gets paid.

It connects:

Supplier status → Acceptance → Payment deadline → Payment → Tax deduction

If any of these stages are not properly tracked, the finance team may not have a clear picture of the potential Section 43B(h) exposure.

A compliance-oriented workflow therefore needs to make the relevant dates and supplier information visible.

The goal is straightforward:

Know which supplier is an MSME.
Know when the payment clock started.
Know when the deadline is approaching.
Act before the deadline is missed.

 

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MSME Payment Compliance Checklist

Finance and accounts payable teams can use this checklist as part of their regular process:

 

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What Finance Teams Should Remember

There are three dates or pieces of information that deserve particular attention:

1. MSME Status

A supplier's status can change after onboarding.

2. Acceptance Date

The payment clock is based on acceptance or deemed acceptance, not simply the invoice date.

3. Payment Deadline

The applicable payment timeline needs to be monitored before the deadline is reached.

Keeping these three elements visible makes MSME payment compliance easier to manage.

 

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Conclusion

The 45-day rule is not just a payment deadline. It is a tax control.

When MSME status, acceptance dates and payment ageing are tracked correctly, finance teams can reduce the risk of Section 43B(h) disallowances, unnecessary tax outflows and year-end surprises.

PurchasePro keeps MSME payables visible, tracks the acceptance-date clock and flags invoices approaching the payment deadline.

Stay ahead of the 45-day clock. Protect your deductions.

Book a Demo with PurchaseProblogblog

Explore how PurchasePro can help automate MSME payment compliance.

[INTERNAL LINK REQUIRED — approved PurchasePro MSME page]

 

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FAQs

1. What is the MSME 45-day payment rule?

The MSME 45-day rule requires buyers to make payment to a Micro or Small enterprise within the agreed period, subject to a maximum of 45 days from the date of acceptance or deemed acceptance of goods or services. Where there is no written agreement, payment is generally required within 15 days.

2. What is Section 43B(h) of the Income Tax Act?

Section 43B(h) provides that certain amounts payable to Micro or Small enterprises are deductible for income-tax purposes only when they are actually paid within the applicable MSMED Act payment timeline. Delayed payment can therefore affect the timing of the buyer's tax deduction.

3. When does the 45-day MSME payment clock start?

The payment clock starts from the date of acceptance or deemed acceptance of the goods or services, rather than simply the invoice date. Finance teams should therefore capture and track the acceptance date accurately.

4. What happens if an MSME payment is made after 45 days?

If payment to a Micro or Small enterprise exceeds the applicable MSMED Act timeline, the related expense may not be deductible in the financial year in which it is incurred. The deduction is generally available in the year in which the payment is actually made, subject to applicable tax provisions.

5. How can companies identify MSME suppliers?

Companies should capture MSME status in the vendor master and periodically update supplier information. The status should remain visible to accounts payable teams so applicable payment timelines can be monitored separately.