Most GST setup problems in Zoho Books are not visible on day one. Everything files fine for the first few months, and then a GSTR-9 annual reconciliation or a client's ITC claim surfaces a mismatch that traces back to something configured wrong at setup — usually the place of supply, an HSN code, or a tax rate left at default. This post walks through the setup correctly, step by step, and flags exactly where that kind of silent error creeps in.
Before You Start: What You Need Ready
Have these on hand before opening Zoho Books — setup goes faster and gets configured correctly the first time:
- Your GSTIN and registered business address exactly as it appears on the GST portal
- Registration type — Regular or Composition scheme
- A list of your goods or services with their correct HSN or SAC codes, not guessed
- Whether any of your regular purchases fall under Reverse Charge Mechanism (RCM)
- Whether you are required to generate e-invoices (applicable above the notified turnover threshold)
Step by Step: Enabling GST in Zoho Books
Step 1 — Enable GST as your tax regime
Go to Settings → Taxes & Compliance → GST. If your organisation was created with India as the base country, GST is usually available here directly; if not, this is where you switch the tax regime on.
Step 2 — Enter your GSTIN and registration details
Add your GSTIN, legal name, trade name if different, and select Regular or Composition as your registration type. Zoho Books reads your state from the GSTIN automatically — confirm it matches your actual registered state before continuing.
Step 3 — Review the default tax rates
Zoho Books comes preloaded with standard GST rate slabs (0%, 5%, 12%, 18%, 28%, plus special rates like 0.25% and 3%). Do not assume these apply correctly to your specific goods or services without checking — they are starting points, not a substitute for setting the right rate per item.
Step 4 — Set HSN or SAC codes on every item
In the Items module, add the correct HSN code (goods) or SAC code (services) to each item as you create it, alongside its GST rate. This field is easy to skip when adding items quickly, and it is exactly what GSTR-1's HSN summary depends on. If your invoice template also needs to display the HSN column in a specific format for your customers, that is a template question covered in our invoice customisation post, not a GST setup one.
Step 5 — Confirm place of supply on each customer
Under each customer's billing details, verify the place of supply state is correct. This single field determines whether Zoho Books applies CGST + SGST or IGST on every invoice to that customer — see the section below for why this matters more than it looks like it should.
Step 6 — Configure RCM on applicable vendors
For purchases from unregistered dealers or notified goods and services, mark the vendor or the specific bill as Reverse Charge Applicable under Settings → Taxes → GST Settings. Zoho Books then calculates the tax liability on you as the recipient instead of the vendor.
How the CGST/SGST vs IGST split actually works: Zoho Books compares your registered state to the customer's place of supply on every transaction. If they match, the GST rate splits automatically into CGST and SGST. If they differ, the full rate applies as IGST. This happens silently — if the place of supply is wrong, the split is wrong on every invoice to that customer until someone notices, usually at return filing.
Composition Scheme: A Different Setup Path
If your registration type is Composition rather than Regular, select this explicitly during Step 2. Zoho Books then applies flat composition rates instead of standard slab rates, and removes input tax credit fields from the interface entirely — composition dealers cannot claim ITC, so there is nothing to track there. Getting the registration type right at setup avoids having to rebuild the tax configuration later if it was set up as Regular by mistake.
Setting up GST in Zoho Books, or inheriting a configuration that does not look right?
We configure Zoho Books for GST compliance for businesses across India — tax rates, HSN codes, e-invoicing and return preparation, set up correctly from day one.
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Once transactions start flowing through with the correct tax setup, GST reports are available under Reports → Taxes → GST Reports — GSTR-1, GSTR-3B, and the underlying ITC computation. Zoho Books' India edition supports direct filing through its GSTN integration on eligible plans; where that is not connected, the return data exports in the format needed for the GST portal or a separate filing tool. If you would rather have this managed as an ongoing service instead of filing it yourself each month, see our GST compliance service for what that looks like.
Set your filing frequency under Settings → Taxes → GST Filing — monthly, or quarterly if you are on the QRMP scheme. This determines how Zoho Books groups transactions into filing periods and what it shows as due in the compliance calendar.
E-Invoicing Setup
If your turnover crosses the notified e-invoicing threshold, invoices need an IRN (Invoice Reference Number) generated through the government's Invoice Registration Portal before they are valid. Zoho Books connects to this through a GSP (GST Suvidha Provider) integration — once configured under Settings → Taxes → E-Invoicing, eligible invoices generate an IRN and QR code automatically at the point of creation, rather than requiring a separate manual step after the fact. Note that e-invoicing applies to tax invoices, not proforma invoices — if you are also issuing proforma invoices for export or advance-payment sales, see how to set those up correctly, since they follow a different workflow entirely.
Common Setup Mistakes We Fix
- Every item left at a default 18% rate. The single most common issue we find — items get created quickly during onboarding and the correct rate never gets set per category, understating or overstating tax until a reconciliation catches it.
- Missing HSN codes on older items. Businesses migrating from Tally or spreadsheets often bring item lists across without HSN codes attached, which quietly breaks the GSTR-1 HSN summary until every item is corrected retroactively.
- Place of supply set from billing address when shipping address differs. For businesses shipping to a different state than the billing address, the wrong address as place of supply produces an incorrect CGST/SGST vs IGST split.
- RCM not flagged on recurring vendors. A vendor that should be marked reverse-charge but is not means the tax liability is simply missed each time, accumulating into a real gap by year end.
Frequently Asked Questions
Want your GST setup reviewed, or need it done right the first time?
We set up and manage GST inside Zoho Books for businesses across India — configuration, monthly filing, GSTR-2B reconciliation and notice handling, all under one team.
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