# Effective Date of Registration (Linked to ITC Eligibility)

A person can claim ITC on stocks held as on the day immediately preceding the date from which he becomes liable to pay tax — therefore the effective date of registration matters.

## Liable to Register (Compulsory)

```

Person becomes liable to register

+----------------+----------------+

v v

Applied within 30 days NOT applied within 30 days

of becoming liable of becoming liable

| |

v v

Effective date = Date on Effective date = Date on which

which he became liable certificate of registration

to register is granted

```

## Voluntary Registration

Effective date = Date on which certificate of registration is granted (always).
No look-back to a 'liable to register' date because there isn't one.

## Why this matters for ITC

A person applying within 30 days gets a back-dated effective date → eligible to claim ITC on inputs in stock as on the day immediately preceding the date of becoming liable.
A person applying late loses ITC on the pre-certificate stock.
A voluntary registrant gets ITC only on stock held immediately preceding the grant date of certificate.

Worked example

### Example 1

Example 1 — Within 30 days

Mr. X became liable to register on 1st June. He applied on 20th June (within 30 days). Certificate granted on 5th July.

Effective date: 1st June
ITC entitlement: On inputs in stock as on 31st May (immediately preceding 1st June).

### Example 2

Example 2 — After 30 days

Same facts but Mr. X applies on 10th July (>30 days). Certificate granted on 20th July.

Effective date: 20th July
ITC on pre-20th July stock — lost.

### Example 3

Example 3 — Voluntary

Mr. Y voluntarily applies on 1st August; certificate granted 10th August.

Effective date: 10th August
ITC entitlement: On inputs in stock as on 9th August.

⚠️ Common exam mistakes

Assuming a voluntary registrant can claim ITC on stocks held before the grant date — they cannot.
Forgetting the 30-day window for back-dated effective date — late applicants forfeit pre-registration ITC.
Counting 30 days from the date of certificate instead of from the date of becoming liable.
Claiming ITC on capital goods at the time of fresh registration under Section 18(1) — the provision extends to inputs and inputs in semi/finished goods, NOT to capital goods.

Bare-Act text Section 25 read with Section 18(1) · CGST Act, 2017 · click to expand

Section 18(1)(a): A person who has applied for registration under this Act within thirty days from the date on which he becomes liable to registration and has been granted such registration shall be entitled to take credit of input tax in respect of inputs held in stock and inputs contained in semi-finished or finished goods held in stock on the day immediately preceding the date from which he becomes liable to pay tax under the provisions of this Act. Section 18(1)(b): A person who takes voluntary registration under sub-section (3) of Section 25 shall be entitled to take credit of input tax in respect of inputs held in stock and inputs contained in semi-finished or finished goods held in stock on the day immediately preceding the date of grant of registration.

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Effective Date of Registration for ITC Purposes

Worked example

⚠️ Common exam mistakes