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How to enter a company's GSTIN in Manage and fix a refused number

Add one or more GSTINs to a company, and learn what each error message means when a number is refused.

Level: beginner · Updated 30 Oct 2026

Before you start

What a GSTIN is

A GSTIN is the 15-character GST registration number of a business. In Aicountly Manage, you can enter it in the Legal identifiers section when you add or edit a company. Aicountly Manage uses these numbers to stop the same company being registered twice. A company with several GST registrations, for example in different states, can enter all of them.

What the 15 characters mean

  • The first two digits are the state code.
  • The next 13 characters are letters or digits. In most cases characters 3 to 12 are the company's PAN.
  • The last character is a check character. It is worked out from the first 14, so it catches typing mistakes.

An example of the right shape is 27AAPFU0939F1ZV.

Before you start

  • Keep the GST registration certificate or a GST return at hand so you can copy the number exactly.
  • You need permission to edit the company. If the fields are greyed out, ask the company owner.

Enter a GSTIN

  1. Open Add Company to create a company, or open the company and choose Edit Company.
  2. Scroll to the Legal identifiers card.
  3. If you know it, type the company's PAN in the PAN field. A PAN is 10 characters: 5 letters, 4 digits, 1 letter, for example AAACA1234A.
  4. Type the number in GSTIN(s). To enter more than one, separate them with commas.
  5. Select Save.

If a GSTIN is refused

Aicountly Manage tells you what is wrong next to the field:

  • “must be 15 characters”: the number is too short or too long, or has a symbol. It needs a two-digit state code followed by 13 letters or digits.
  • “does not add up”: the last character does not match the rest. Compare each character with your certificate, especially similar ones such as 0 and O, or 1 and I.
  • “Each GSTIN should contain the PAN above”: characters 3 to 12 of the GSTIN are a PAN that differs from the one you typed. Correct the PAN or the GSTIN.

When you enter several numbers, the message names the GSTIN that has the problem. A GSTIN registered by a tax deductor is built on a TAN instead of a PAN. Aicountly Manage accepts it, and does not compare it with the PAN field.

If the company is already registered

If a company with the same identifier already exists, Aicountly Manage shows a notice listing the matching companies. You can request access to the existing company or acknowledge the notice before carrying on.

Steps

  1. Open Add Company, or open the company and choose Edit Company.
  2. Scroll to the Legal identifiers card.
  3. If you know it, type the 10-character PAN in the PAN field.
  4. Type the number in GSTIN(s). Separate several with commas.
  5. Select Save.

Troubleshooting


Still stuck? Contact support or ask in the community.