The layout is the easy part of bill html template. What makes a document a valid tax invoice is its content and its numbering, and that is where almost every free template falls down. This page covers both, and then offers you a way to stop maintaining the file at all.
Why the file is usually the thing that breaks
The failure is nearly always the same, and it is never the layout. Two people work from two copies of the file, the numbering collides, and a month cannot be reconciled. Or a formula in one row gets flattened by a typed-in figure and nobody notices for six weeks.
A spreadsheet is excellent at arithmetic and poor at being a system of record, because nothing in it is authoritative. Any cell can be any value, and the file has no opinion about which version of itself is the real one.
That is the actual argument for a billing system, and it has nothing to do with how the invoice looks.
The eight lines people leave off
- A number that cannot repeat. One series, consecutive, unique within the financial year. Two people with two copies of a file is how this breaks.
- Your GSTIN, spelled exactly as registered.
- The customer's GSTIN where they are registered — without it they cannot claim the credit, and they will ask again.
- Place of supply on anything inter-state. This decides the tax, so guessing it wrong is not a cosmetic error.
- HSN or SAC on every line, not just on the first one.
- The taxable value per line, before tax, shown separately from the tax.
- Each tax head on its own line — CGST and SGST, or IGST. Never one combined "GST" figure.
- Reverse charge marked where it applies, even when the answer is no.
An HTML invoice template, and what it is actually for
An HTML template is the right answer when the invoice has to be generated by something — a website, a script, a small internal tool — rather than typed by a person. The layout is markup, the figures come from your data, and the output converts cleanly to PDF.
Keep it boring. A table for the line items, print styles with fixed widths in millimetres rather than screen-relative units, and no dependence on web fonts or external stylesheets that will not be there at print time. Put the totals in markup rather than computing them in the browser, so what is printed is what was calculated.
The part people underestimate is everything around the template: the numbering series, storing what was issued, and regenerating a document identically six months later. That is an application, not a page, and writing it is a bigger job than the template suggests.
If the reason you want HTML is "so it can be automated", it is worth checking whether something that already does the automating is cheaper than building it.
What you get here instead of a file
- Every mandatory field present, because the document is built from records rather than typed into a layout.
- One numbering series, issued centrally, consecutive, restarting each financial year — so a number cannot be used twice.
- Customers stored once with GSTIN, address and state, so the details are right on the fortieth invoice too.
- Items stored once with HSN or SAC, rate and tax.
- The tax derived, not chosen — CGST and SGST or IGST, from the place of supply against your registration state.
- A clean PDF to print, email or send on WhatsApp.
- An answer to "what is unpaid", which no template has ever been able to give.
- Your data exportable to CSV, Excel and JSON at any time, on every plan including the free one.
- Free — ₹0, no card, no expiry.
From a template to a proper invoice in about five minutes
- Start free now — an email address and a password, no card.
- Enter your business name, address and GSTIN once. These are the fields you have been retyping.
- Add a customer with their GSTIN and state, or import your whole list from the spreadsheet you already have.
- Add the items you sell with their HSN or SAC codes and rates.
- Set the invoice number your series should carry on from, so there is no gap and no restart.
- Raise the invoice. The number, the tax split and the totals are already filled in.
- Download the PDF, or send it straight to the customer.
Keeping the document for as long as you have to
Invoices and the records behind them have to be retained for a prescribed period, counted from the due date of the annual return for the relevant year rather than from the invoice date — so the obligation runs well past the point most people have stopped thinking about it. Check the period currently in force for your own case.
That has a practical consequence for how you store them. A laptop, a phone and a folder of PDFs are not a retention plan: the horizon is years, and it outlasts most hardware and most staff.
Where the records are kept electronically, they have to remain accessible and readable for the whole period — which means a format you can still open and a copy somewhere other than the machine that made it.
This is dull and it is also the thing that is actually asked for when it is asked for. Records held in one place, exportable in full, cost nothing to keep and a great deal to reconstruct.
The numbering rule, which is where templates fail first
The invoice number has to be a consecutive serial, unique within the financial year, not more than sixteen characters, and made only of letters, numbers, hyphens and slashes. One series, or clearly separated series if you genuinely need more than one — but each consecutive in itself.
A file cannot enforce any of that. The number is typed, which means it can be repeated, skipped or quietly rolled back when yesterday's invoice is edited into today's. A duplicate is not found at billing time; it is found at return time, in the month after the one it happened in.
The other half of the rule is that a cancelled invoice keeps its number. Deleting the row and reusing the number leaves a gap in your books and a figure in your customer's, and reconciling that is a long afternoon.
This is the single most practical argument for a system over a file, and it has nothing to do with features.
What a GST invoice legally has to carry
Rule 46 of the CGST Rules sets out what a tax invoice must show, and it is a longer list than most invoice templates carry. Getting one field wrong does not usually cost you anything the day you raise it — it costs your customer their input credit months later, which is a harder conversation.
The fields are:
- Your name, address and GSTIN
- A consecutive invoice number, unique within the financial year
- The date of issue
- The customer's name, address and GSTIN where they are registered
- Place of supply, and the state code, for inter-state supplies
- HSN or SAC against every line
- Description, quantity, unit, rate and taxable value per line
- Rate and amount of CGST, SGST/UTGST, IGST and cess, shown separately
- Whether tax is payable on reverse charge
- Signature or digital signature of the supplier or an authorised person
Billixo fills these in from the customer and product records rather than asking you to remember them, which is the only reliable way a busy counter gets them all right every time.
CGST, SGST and IGST — worked out, not chosen
Whether a sale attracts CGST and SGST or IGST is not a preference. It follows from the place of supply: same state as your registration means the tax splits into central and state halves, a different state means one integrated tax at the combined rate.
That sounds simple and goes wrong constantly, because it is a dropdown in most billing software and a dropdown is something a tired person clicks past. In Billixo the split is derived from the state on the customer record against the state on your registration, and it changes the moment either does.
The consequence of getting it wrong is real: an IGST invoice raised as CGST/SGST has to be credited and reissued, and if the return has already gone in, amended.
The AI, and what it is actually for
The useful application of AI to billing is not a chatbot. It is the twenty minutes a day spent retyping things that already exist on paper.
- Scan a supplier bill. Photograph it; the lines, the GSTIN, the tax and the totals come back as a draft you check rather than a form you fill.
- Find the HSN code. Describe the product in plain words and get a code to confirm, instead of scrolling a list of eleven thousand.
- Ask about your own numbers. "What is outstanding over sixty days?" answered from your data, not a manual.
- Write the reminder. A polite, specific chase for an overdue invoice, ready to send on WhatsApp.
Nothing is sent anywhere until you ask for it, and the platform runs on whichever model it has been configured with — including one hosted on your own server.
Where this fits in a working day
Morning: yesterday’s supplier bills get photographed and become purchase records. Through the day: invoices go out as goods do, shared on WhatsApp before the customer has left. End of the week: the receivables list says who to call. End of the month: the GST summary is a download, not a project.
None of that requires a new habit, which is the point. A billing system that needs discipline to work is one that stops working the first busy week.
What "free" means here, exactly
The Free plan costs nothing, needs no card, and has no expiry date. It is not a trial that turns into a bill; it is a plan you can run a small business on indefinitely.
What it gives you:
- Real GST invoices with the full Rule 46 field set
- Customers and products, with HSN/SAC held against each
- A daily and monthly invoice allowance, generous enough for a small operation
- One login
- Export of your own data, whenever you want it
What it does not give you:
- A watermark-free PDF
- GSTR-1 and GSTR-3B export
- The AI features — bill scanning, HSN lookup, the assistant
- Extra team logins, bulk import, recurring invoices and reminders
Every new account also gets the full paid feature set for its first 14 days, so you can see what the ceiling looks like before deciding whether you need it. When that ends nothing is charged and nothing is deleted — the account simply settles onto Free.
Start free now — it takes an email address and about a minute.
Where your data lives
On the server this platform is installed on. Every record carries a company identifier and every query is scoped to the signed-in account at the framework level, so one business cannot read another’s data by any route, including a crafted one.
Sign-in is rate limited, sessions can be restricted to one device per user, and passwords are stored hashed. Exports are available on every plan, free included: if you ever want to leave, your data leaves with you.
Frequently asked questions
Is a template invoice legally valid?
A document is valid if it carries the content the law requires, whatever produced it — a printed book, a spreadsheet or a system. The format is not the issue; the missing fields are. Most free templates are short of place of supply, an HSN or SAC per line, or the tax heads shown separately, and any one of those makes the document deficient.
Can I keep using Excel for my invoices?
Yes, and plenty of small businesses reasonably do. The point at which it stops working is specific rather than vague: a second person starts billing, the volume passes roughly twenty a month, or you need to answer "what is outstanding" and file a return from it. Until then a carefully built spreadsheet is a legitimate tool.
What is the difference between a tax invoice and a bill of supply?
A tax invoice is issued on a taxable supply and shows the tax separately so the buyer can claim input credit. A bill of supply is issued where no tax is being charged — an exempt supply, or a composition dealer — and must not show a tax amount at all. Issuing the wrong one is a compliance error, not a presentation choice.
Do I need to install anything?
No. It runs in a browser, on a laptop, desktop or phone, so there is nothing to install, nothing to update and nothing tied to one machine. If the office computer dies, you sign in from another one and everything is there.
Are the invoices valid for GST?
Yes. Every invoice carries the fields Rule 46 requires — GSTIN, HSN/SAC on each line, place of supply, the correct CGST/SGST or IGST split, and a consecutive invoice series that restarts each financial year.
Try it — the demo is the product
There is no sales call and no scheduled demo, because a recorded walkthrough of somebody else’s data tells you nothing about your own. Open an account instead and raise a real invoice for a real customer; it takes about a minute and costs nothing.
Open the software demo → — sign in, or create a free account from the same screen.
See full details on the home page → — features, the AI, pricing and the answers to the usual questions.
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