New businesses tend to treat GST registration as the finish line rather than the starting point. The gap between "registered" and "compliant" is where most early penalties and notices originate - almost always from process gaps in the first few months, not from deliberate non-compliance.
1. Register Before You Need To, Not After
The Rs 40 lakh/Rs 20 lakh threshold (goods/services, varying by state) is a floor, not a target to plan around. Businesses that expect to cross it within the year are better served registering early and building GST-compliant invoicing into their systems from day one, rather than scrambling for backdated compliance once the threshold is breached mid-year.
2. Get the HSN/SAC Classification Right at Registration
Wrong or overly broad HSN/SAC codes at registration cause two downstream problems: rate mismatches that surface at audit, and e-invoicing/e-way bill validation failures once turnover crosses those separate thresholds. Fixing classification after a year of returns filed under the wrong code is far more work than getting it right once.
3. Build the GSTR-1/3B Reconciliation Habit Immediately
GSTR-1 (outward supply detail) and GSTR-3B (summary return with tax payment) must tie out, and both must tie out to books. Businesses that file GSTR-3B from a rough estimate and true it up "later" accumulate a widening gap that becomes a genuine reconciliation project by year-end, and a red flag for automated GST scrutiny well before that.
4. Input Tax Credit Discipline From the First Purchase
ITC is only available where the supplier has actually filed their GSTR-1 and the invoice reflects in GSTR-2B - the buyer's ITC claim is no longer just a matter of holding a valid tax invoice. New businesses should vet supplier GST compliance (filing regularity, active registration status) before treating an ITC claim as safe, not after a mismatch notice arrives.
5. Know Your RCM Exposure
Reverse Charge Mechanism liability - on specified goods/services, and on supplies from unregistered persons in certain categories - is frequently missed entirely by first-time filers, since there is no vendor invoice prompting the entry. This has to be tracked proactively against the notified RCM list, not discovered at audit.
6. Composition Scheme: Evaluate It Honestly, Not by Default
Composition is attractive for its lower compliance burden, but it forecloses ITC entirely and restricts inter-state supply. Businesses selling to GST-registered buyers who need to pass on ITC are usually better off under the regular scheme even at a marginally higher compliance cost - a decision worth making deliberately at registration, not drifting into.
Practical Takeaway
Most GST notices in a business's first two years trace back to registration-stage decisions - classification, scheme selection, and whether reconciliation discipline was built in from month one. Getting these right early is cheaper than any subsequent correction.
The author is a Partner at Agrawal Khandelwal & Associates LLP, Chartered Accountants in Nashik and Sillod, Maharashtra, advising on GST registration, compliance and audit.
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