Guides to help you run your business

GST, in plain words. GST (Goods and Services Tax) is a single tax charged on the sale of most goods and services in India, it replaced a number of older, separate taxes so there'd be just one to think about. It's collected at each step of a sale, but it's really meant to land on the final customer, not on the businesses in between. If you're registered, you collect it from your customer and pass it along to the government, adjusting for whatever GST you've already paid on your own business expenses.

Why invoices matter, beyond just billing. Think of a proper invoice as your proof of what actually happened. It protects you if a customer ever disputes what was agreed, it's what they need if they want to claim GST credit on the purchase, and it's the paper trail tax authorities look for if your business is ever reviewed. It's not paperwork for its own sake, it's there to back you up.

GST Invoice vs. Cash Bill, the actual difference. If your business is registered for GST, the law asks you to issue a proper tax invoice with your GSTIN and the tax breakdown, that's the GST Invoice option. If you're not GST-registered, you're not allowed to charge GST at all, full stop, and what you issue instead is usually called a Bill of Supply, a straightforward record of sale that makes no tax claims, that's the Cash Bill option. Neither one is more "proper" than the other, which one is yours comes down entirely to whether you're registered, nothing else.

CGST, SGST, and IGST, without the acronym soup. When a sale happens within the same state, the GST gets split roughly in half between the state government (SGST) and the central government (CGST). When a sale crosses state lines, it's charged as one combined amount to the central government instead (IGST), which then settles up with the other state. You don't need to remember which one applies, whether the sale is within-state or across states decides it for you automatically.

Rates aren't one flat number. GST isn't a single percentage, different goods and services sit in different rate bands, and those bands get revised now and then. It's worth checking with your accountant which one applies to what you sell, rather than going on memory or what applied last time, things do shift.

Reverse charge, in plain terms. You'll see a "Reverse charge applicable?" field on the GST Invoice form, here's why it's there. Normally the seller collects GST and pays it to the government. In certain situations, that responsibility flips, and the buyer pays the tax directly instead. It's the exception, not the rule, so if you're ever unsure whether it applies to a sale, that's a question worth asking your accountant, not guessing at.

Input tax credit, briefly. A registered business can usually reduce what it owes in GST by the GST it's already paid on its own purchases and expenses. It's part of why a proper invoice matters even when you're the one receiving it, not just issuing it, a sloppy or missing invoice from a supplier could quietly cost you a credit you're otherwise entitled to.

Composition scheme, worth asking about. There's a simplified alternative scheme for smaller businesses, it trades away a little flexibility in exchange for easier compliance and a lighter tax burden. Whether you'd qualify or benefit depends on details that shift and vary by situation, so it's worth a direct question to your accountant rather than something to work out from a guide like this one.

• Send your invoice as soon as the work is done, not weeks later. The single biggest cause of late payment is simply a late invoice, customers rarely pay faster than the bill actually reaches them.
• Never skip or repeat an invoice number. Sequential numbering with no gaps is what makes your invoice trail believable, to customers and to anyone reviewing your accounts later. Let DocsBaby handle the numbering for you rather than typing numbers by hand, one less thing to get wrong.
• Prefer traceable payments over cash for anything business-related. Bank transfer, UPI, or cheque all leave a record that protects you if a payment is ever disputed later. Cash is harder to reconcile, and harder to prove after the fact.
• Keep digital copies, not just paper. A phone can be lost, a paper bill book can get damaged or soaked. A PDF saved somewhere backed up, like your email or cloud storage, survives both.
• Check your unpaid invoices weekly, not "eventually." Money owed to you is easiest to collect soon after the sale, the longer a bill sits unpaid, the less likely it ever gets paid in full.
• Keep your business money separate from your personal money. Even for a small or informal business, a separate account, or at the very least a separate mental ledger, makes it much easier to see whether you're actually making a profit.
• Send a gentle reminder before the due date, not just after. A short, polite nudge a day or two ahead catches people while it's still on their mind, rather than chasing them once it's already overdue.
• Agree on payment terms upfront, not after the fact. Settling when payment is expected before the work even starts avoids awkward conversations later, and gives you something concrete to point back to if payment ends up late.
• Feel free to ask for a partial advance on large or first-time orders. It's a normal, reasonable request, not an awkward one, and it protects you if a new customer turns out to be unreliable.

Whatever the exact legal requirements, a well-formed invoice usually includes:

• Who's selling and who's buying: full business name and address for both sides, not just a name.
• A unique invoice number and date: sequential, never reused, this is what makes the record trustworthy.
• A clear description of what was sold: specific enough that a stranger reading it later would understand what the sale was, not just "services."
• Quantity, rate, and the resulting amount: spelled out per line, not just a single total, so either party can check the maths.
• Tax details, if applicable: GSTIN, HSN/SAC codes, and the tax breakdown, only if you're GST-registered. HSN/SAC codes classify what you're selling in a standard way tax authorities recognise, worth getting right rather than guessing.
• A signature or authorisation: even a simple "authorised signatory" line adds a layer of accountability.
• Payment terms or a due date: one of the most commonly missed details, and a direct fix for the late-payment problem mentioned in the tips above. If it's not written down, "as soon as possible" is doing all the work.
• How you'd like to be paid: bank details or a UPI ID, right there on the invoice, so the buyer doesn't have to ask separately. A small addition that quietly speeds up getting paid.

The good news: this is exactly what DocsBaby fills in for you automatically, whichever one you're using, so the structure is always right without you having to remember all of this every time. Still not sure which of the two is you? See the simple difference.