What is Udyam Registration?

Also called: MSME Registration

Udyam registration is the government's free online recognition of a micro, small or medium enterprise, based on investment and turnover, and it is the gateway to MSME benefits.

Classification runs on both investment and turnover: micro up to ₹1 crore and ₹5 crore, small up to ₹10 crore and ₹50 crore, medium up to ₹50 crore and ₹250 crore. Registration is free, needs only Aadhaar and PAN, and self-declares those figures.

The most valuable benefit is section 43B(h) of the Income Tax Act: a buyer who does not pay a registered micro or small enterprise within 45 days cannot deduct that expense until they do.

Why it matters

Registering makes your invoices harder to leave unpaid, because delay now costs your customer a tax deduction.

A worked example

A registered micro enterprise invoices ₹5,00,000 and the buyer pays after 130 days instead of the statutory 45.

Illustrative figures. Your own numbers will differ — that is what the quote is for.
Invoice value	₹5,00,000
Statutory payment period	45 days from acceptance
Days of delay	85
Interest rate	Three times the RBI bank rate, compounded monthly
Interest is compulsory	It cannot be waived by agreement
Buyer's own tax position	Deduction disallowed until actually paid, under section 43B(h)

The interest is worth having, but it is the section 43B(h) disallowance that changes buyer behaviour: an unpaid MSME invoice raises the buyer's own taxable profit for that year, which their finance team notices well before your reminder does.

The statutory position

Each figure with the provision it comes from, so it can be checked.
What	Position	Source
Micro enterprise	Investment up to ₹2.5 crore and turnover up to ₹10 crore	MSMED Act classification, revised with effect from 1 April 2025
Small enterprise	Investment up to ₹25 crore and turnover up to ₹100 crore	MSMED Act classification, revised with effect from 1 April 2025
Buyer payment period	45 days from acceptance	Section 15, MSMED Act 2006
Interest on delayed payment	Three times the RBI bank rate, compounded monthly	Section 16, MSMED Act 2006
Registration fee	Nil	Udyam Registration portal, Ministry of MSME

Not to be confused with

These get used interchangeably, including by tools that should know better. They are different things.

GST registration

GST is a tax registration with monthly returns. Udyam is a classification with no returns at all, and neither substitutes for the other.

Udyog Aadhaar

Udyog Aadhaar was the predecessor and no longer valid. Existing holders had to migrate to Udyam.

Questions people ask

What is the 45-day rule actually worth?

It converts a payment terms negotiation into a statutory entitlement, with compulsory compound interest attached and a complaint mechanism through MSME Samadhaan. Buyers also lose a tax deduction under section 43B(h) if they do not pay a registered MSME on time, which is usually the argument that works.

Do I need to register each branch?

No. One Udyam registration covers the whole enterprise on the same PAN, including all its locations and activities.

What usually goes wrong

Paying an agent for a free registration
Not printing the Udyam number on invoices, which is what a buyer checks
Never using MSME Samadhaan, and writing off receivables the Act gives a remedy for
Letting the classification go stale as turnover grows