What is Sole Proprietorship?

A sole proprietorship is a business owned by one person with no legal separation between the owner and the business, so the owner is personally liable for everything it owes.

There is no incorporation and no registrar — the business is recognised through its registrations: GST, MSME, a trade licence, a current account in the trade name. The proprietor files one return covering both personal and business income.

Because there is no separate legal entity, the business cannot survive its owner and cannot take on shareholders.

Why it matters

It is the cheapest and fastest way to start, and the most expensive way to fail — a business debt is your debt, recoverable from your house.

The statutory position

Each figure with the provision it comes from, so it can be checked.
What	Position	Source
Registration	No separate registration exists — the business is the proprietor	No governing statute; recognised through tax and licence registrations
Income tax	Taxed at the proprietor's individual slab rates on the proprietor's PAN	Income-tax Act 1961
Liability	Unlimited — personal assets stand behind business debts	Consequence of there being no separate legal person
Usual proofs of existence	GST registration, Udyam registration, trade licence, a current account	Bank and departmental practice

Not to be confused with

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

OPC

An OPC is a registered company with limited liability and annual MCA filings. A proprietorship is neither registered nor limited, and has no MCA existence at all.

Partnership firm

A partnership has two or more people. A proprietorship has exactly one, and adding a second person to the business converts it into something else.

Questions people ask

How do I 'register' a proprietorship?

You do not — there is no registry. What people mean by registering one is obtaining the registrations that prove it exists: GST where the threshold applies, Udyam, a trade licence, and a current account in the business name.

Is it really the cheapest option?

To start and to run, yes. What it does not carry is limited liability, and that is the trade being made. For a business with trade credit, borrowings or any real claim exposure, the annual cost of an LLP buys something the proprietorship cannot.

What usually goes wrong

Treating drawings as a business expense — they are not deductible
Mixing personal and business banking, which makes the books impossible to defend
Assuming a GST registration or a trade licence creates a separate legal entity
Carrying significant trade credit personally when an LLP would have limited the exposure