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Strategic Tax Consulting Classification • Cross-Border Structuring • Retainers

GST Advisory & Indirect Tax Consulting

Navigate complex indirect tax regulations with confidence. Expert advice on HSN/SAC code classification, contract review, transaction structuring, and advance rulings.

  • Accurate HSN / SAC classification and applicable tax rate determination
  • Structuring cross-border SaaS, import/export contracts, and royalties
  • Supply chain tax optimization and Input Tax Credit structuring
  • Application for Advance Ruling (AAR) to secure binding government clarity
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Expert GST Advisory Services for Seamless Tax Compliance

GST advisory is professional guidance that keeps your business registered correctly, filing accurately, claiming every rupee of credit it is owed and answering the tax department with evidence when it asks questions. It is not the same as hiring someone to press "file" on the 20th of each month. At LegalDev, our CA and tax compliance team handles the decisions behind the filing, with 10+ years of collective experience in Indian indirect taxation, GST registration, litigation and return filing for SMEs.

This page is for owners and finance heads of startups and small and mid-sized businesses who want a qualified team to take over GST compliance, or to fix what has already gone sideways.

Services Covered
Registration to Litigation
GSTR-1 / GSTR-3B Due
11th / 20th of Next Month
Late Return Cut-off
3 Years from Due Date

Key takeaways

GST advisory is ongoing professional guidance on registration, returns, input tax credit, notices and audits, so mistakes are caught before the portal or the department catches them.
Since December 2025 the GST portal permanently blocks any return filed more than three years after its due date, so old gaps can no longer be fixed.
Most expensive GST problems come from mismatched data and missed credit deadlines, not from the tax rate.
A notice is a deadline-driven legal process. A reply that skips the paperwork rarely survives.

What is GST Advisory and Why Your Business Needs It

GST advisory covers every point where your business touches the GST system: whether you must register, how invoices are raised, what goes into GSTR-1 and GSTR-3B, which credits you can claim, and how to respond when an officer writes to you. An advisor looks at the whole chain, not one return at a time.

Why does this matter more now than it did a few years ago? Because the portal has stopped being forgiving. Industry summaries of the 2026 rule changes, including those from Vayana and Cashfree, describe a shift from correct-it-later filing to system-enforced compliance. Two changes stand out:

A three-year hard stop. A return that is more than three years past its original due date can no longer be filed. A missed period from FY 2022-23 that you meant to "sort out later" may now be permanently stuck.
Blocked filing. The system can refuse to open GSTR-3B when conditions are unmet, such as unreconciled ledger balances or an earlier return still pending. Problems must be cleared before filing, not after.

There is also a rate backdrop to know about. After the GST Council's 56th meeting, most goods and services moved to a simplified structure of 5% and 18%, with a higher rate for a short list of sin and luxury items, effective 22 September 2025. If your invoicing software or HSN mapping was last reviewed before that date, check it.

Three kinds of businesses benefit most from advisory support:

New businesses
Who need registration done correctly the first time.
Growing businesses
Crossing thresholds (₹40 lakh for goods, ₹20 lakh for services in most states, lower for special category states) or adding states, which means additional registrations.
Businesses with a backlog
Such as unfiled returns, a notice in the inbox or a mismatch nobody can explain.

Key Areas Covered Under Our GST Advisory Services

Each area below stands on its own, so jump to the one you need.

GST registration process

Registration is a PAN-based application on the GST portal. You will need your PAN, Aadhaar for authentication, proof of business address, bank account details and a photograph of the proprietor or authorised signatory. Most clean applications get a GSTIN within a week or so, but queries from the officer can stretch that.

Where businesses go wrong is in the choices made at the form stage. The nature of business, the HSN or SAC codes, the principal versus additional place of business and the choice of regular or composition scheme all affect what you file later. If you operate across states, each state needs its own registration, and the law treats each one as a separate person. Stock transfers between them are taxable supplies. We map this before you apply, not after.

GST return filing compliance

Regular taxpayers file GSTR-1 (outward supplies) by the 11th of the following month and GSTR-3B (summary and payment) by the 20th. Businesses on the QRMP scheme file quarterly and pay monthly. Annual returns follow: GSTR-9 is mandatory above ₹2 crore in turnover, and a reconciliation statement in GSTR-9C applies above ₹5 crore.

The cost of lateness is concrete. The late fee on GSTR-3B is ₹50 a day (₹20 for nil returns), subject to caps, and interest on unpaid tax runs at 18% a year. Our team prepares returns from your books, reconciles them against what the portal shows, and files before the due date, with a working file you can audit later.

Input tax credit advisory

Input tax credit (ITC) is usually the largest lever in a GST return, and the easiest to lose. The conditions are strict: you must hold a valid tax invoice, the goods or services must be received, the supplier must have filed their return and paid the tax, and you must file your own return. Section 16(4) also sets a time limit. Credit for a financial year has to be claimed by 30 November following that year, or the date of filing the annual return, whichever comes first.

Some credit is blocked by law regardless of how clean the paperwork is, for example on motor vehicles for most uses, food and beverages, and personal consumption. We review your purchase ledger against GSTR-2B, flag supplier defaults, separate eligible from blocked credit and show you what to chase before the window shuts.

GST notice reply services

A notice can arrive for many reasons: a mismatch between GSTR-1 and GSTR-3B, excess ITC, a pending return, or a scrutiny or audit selection. Every notice carries a response window, and the department can pass an order against you if you stay silent. We read the notice, identify what the officer is actually alleging, assemble reconciliations and documents, and draft a reply that answers the allegation point by point. If an order goes against you, an appeal to the first appellate authority generally has to be filed within three months, with a pre-deposit of 10% of the disputed tax.

GST audit and tax planning

A GST audit, whether departmental or a voluntary internal review, tests whether your returns tell a consistent story across invoices, e-way bills, books and annual filings. We run that test before anyone else does. Tax planning sits alongside it: choosing between regular and composition schemes, structuring inter-state supplies, deciding on LUT filing for exports, and timing purchases and credits within the law. None of this is about avoiding tax. It is about paying exactly what is due, no more.

Common GST Compliance Pitfalls Businesses Face

These are the patterns we see repeatedly in SME files. They are listed roughly in order of how much they tend to cost.

Pitfall What goes wrong The practical fix
Claiming ITC the supplier never paid Credit is reversed with 18% to 24% interest Match purchases to GSTR-2B every month and chase defaulting vendors early
Missing the Section 16(4) deadline Credit is lost permanently Calendar 30 November; claim older credit before it
GSTR-1 and GSTR-3B don't match Triggers an automated mismatch notice Reconcile sales between the two before filing
Ignoring unfiled returns Registration cancellation proceedings; filing eventually blocked by the three-year limit File backlogs now, oldest first
Wrong HSN or rate on invoices Short payment, or customers lose credit Review masters after any rate change
Skipping e-invoicing when thresholds are crossed Invoices without an IRN are not valid for credit Track aggregate turnover; e-invoicing applies at ₹5 crore, with a 30-day reporting limit for larger taxpayers
Treating a notice as routine mail Ex parte order passed after the response window lapses Log the date the day it arrives and brief an advisor immediately
One more point deserves its own mention. Registration cancellation for non-filing is a process with notices and timelines, not a single event. Many owners find out only when their e-way bill generation stops working. If that is you, revocation is possible but time-bound.

How LegalDev Helps You Streamline GST Filings & Notices

Our work is organised around the sequence a business actually experiences GST, from onboarding to disputes.

1

Health check

We pull your portal data, returns history, GSTR-2B and books, and tell you where you stand: pending returns, credit at risk, open notices, mismatches.

2

Registration and setup

New GSTINs, additional places of business, scheme selection, and invoice and HSN configuration.

3

Monthly and quarterly compliance

Return preparation, reconciliation against the portal, tax payment calculation and filing ahead of the due date. You receive a short summary each cycle covering what was filed, what was paid and anything needing a decision.

4

Credit review

A scheduled ITC reconciliation so vendor defaults are caught while there is still time to act.

5

Notices and litigation

Replies, hearings and appeals, drafted by the team that knows your filings.

6

Annual returns and audit readiness

GSTR-9 and GSTR-9C where applicable, with a reconciliation between books and returns.

You will deal with a named team that has worked on indirect tax matters for SMEs for over a decade collectively, not a rotating helpdesk. For registration, see our GST registration service. For monthly work, see GST return filing. If a notice is already on your desk, go straight to GST notice reply services or contact us with the notice attached.

Frequently Asked Questions (FAQs)

Businesses whose aggregate annual turnover exceeds ₹40 lakh for goods or ₹20 lakh for services must register. Special category states have lower limits (₹20 lakh and ₹10 lakh). Inter-state suppliers of services, e-commerce operators and sellers on marketplaces, and certain other categories must register regardless of turnover, so check your category before relying on the threshold.

A complete application typically results in a GSTIN within about a week. Officer queries and mismatched documents are the usual cause of delay.

PAN, Aadhaar, proof of business address (rent agreement plus a utility bill, or an ownership document), bank account proof, and a photograph. Companies and LLPs also need incorporation documents and authorised signatory details.

GSTR-1 is due on the 11th of the next month for monthly filers. GSTR-3B is due on the 20th. QRMP filers have different dates, so confirm yours on the portal.

You pay a daily late fee (₹50 a day for regular returns, ₹20 for nil returns, subject to caps) plus interest at 18% a year on any tax paid late. Persistent non-filing can lead to cancellation of registration.

Not if more than three years have passed since the original due date. Industry sources dating this change to December 2025 describe the portal as permanently blocking such returns. Check your oldest pending period on the portal before you plan anything else.

It is the GST you paid on business purchases, set off against the GST you collect on sales. A registered taxpayer can claim it if they hold a valid invoice, received the goods or services, and the supplier has paid the tax to the government, within the Section 16(4) time limit.

Usually because a supplier filed late, filed with errors or never filed. Credit in your books that does not appear in GSTR-2B is at risk. Ask the supplier to correct or file, and do not claim it until it reflects.

Read the notice type and the response deadline. Gather the invoices, returns and reconciliations that relate to the allegation. Reply within the time allowed, with documents attached. If the notice is a show cause notice for demand, get professional help immediately. An order passed after a missed response is much harder to reverse.

You can appeal to the first appellate authority, generally within three months of the order, after paying 10% of the disputed tax. Late appeals are accepted only within a limited condonation window.

There is no blanket mandatory audit for small businesses, but annual return and reconciliation filings apply above the thresholds mentioned earlier. Any business can be selected for a departmental audit or scrutiny, so keeping books and returns reconciled is the safer course.

Software records transactions. It does not decide whether credit is eligible, whether a supply is taxable in a given way, or how to answer a notice. If your returns are simple and your vendors are clean, software may be enough. If you have mismatches, multiple states, exports or any notice, you need someone qualified to make those calls.

Let a qualified team take over your GST compliance

Whether you need registration, monthly filing, a credit review or a notice reply, our CA and tax team handles the decisions behind the filing.