What has to be on an invoice?

Both parties' legal names and addresses, a unique sequential invoice number, the issue and due dates, itemised work, the total, any tax shown separately with your registration number, and complete bank details. Add the client's purchase order reference wherever they use one.

Can I charge interest on a late payment?

Yes, provided the rate and the trigger were agreed in the contract before the work started. Adding a charge to an overdue invoice that was never mentioned is generally unenforceable and tends to stall the payment further rather than release it.

Should I ask for a deposit?

For any new client, and for any fixed-scope project of meaningful size. Thirty to fifty percent is normal. It covers your exposure if the engagement collapses and it filters out clients who were never going to pay, which is most of its value.

The client says they never received my invoice. What now?

Resend it to accounts payable with your contact copied, keeping the original invoice number rather than issuing a new one. Then ask for the address invoices should go to in future. This is common enough that confirming receipt two days after sending is worth doing every time.

Why is the amount paid less than I invoiced?

Most often tax deducted at source, which the client pays to the tax authority on your behalf and which you reconcile against your own liability. Less often a bank transfer fee, or a deduction the client believes was agreed. Ask for a remittance advice before assuming an error.

Freelance moneyFreelanceInvoicing

Getting an invoice paid on time

Most late invoices were unpayable when sent. The fields finance systems stop on, terms worth setting instead of net 30, and an escalation ladder decided before you need it.

Ashish S KumarPublished 28 Sept 20266 min read

Late payment is usually treated as a client problem. Some of it is. But a large share of invoices that go unpaid for sixty days were unpayable on arrival — sent to the wrong person, missing a reference the finance system requires, or landing the day after a payment run closed. Those are all fixable before the invoice leaves your desk, and fixing them is considerably less unpleasant than chasing.

An invoice is a document that has to survive a process

Your contact is rarely the person who pays you. At any client above a handful of people, the invoice is forwarded into a finance workflow that will check it against a purchase order, match it to an approved supplier record, and schedule it into a payment run. Every field that workflow needs and cannot find is a reason for it to stop.

The client's correct legal entity name, not the trading name on their website.
A unique, sequential invoice number — finance systems reject duplicates and auditors ask about gaps.
Issue date and a payment due date as an actual date, not "net 30".
A purchase order or reference number if the client uses them. Ask before the work starts, not after.
Line items matching how the work was agreed, so an approver recognises what they signed off.
Bank details in full, and the same ones every time.
Your tax registration number where you have one, and the tax shown as its own line.

Build an invoice with those fields

Runs in your browser — nothing is uploaded. Open the full invoice generator

Terms are a decision, not a formality

Net 30 is the default almost nobody consciously chose. It is a convention from an era of posted cheques, and for a one-person business it means financing a client's operations for a month at no charge. You are allowed to set different terms, and the time to set them is in the contract, not on the invoice.

Arrangement	Suits	Watch for
Deposit up front, balance on delivery	New clients, fixed-scope projects	Ask for 30–50%; below that it stops filtering anyone
Milestone billing	Anything over a few weeks	Tie milestones to deliverables, not to dates
Monthly in arrears	Ongoing retainers	Invoice on a fixed day so it enters the same payment run
Monthly in advance	Retainers with a reserved-capacity element	Easier to agree at renewal than mid-term
Net 30 on completion	Large organisations that will not move	Price the delay in rather than absorbing it

A large client whose payment terms genuinely cannot be changed is not necessarily a bad client. It is a client whose terms are a cost, and costs belong in the rate. If sixty-day terms are the condition of the work, that is a legitimate input to the price rather than something to be endured quietly.

If you have not worked out what a day of your time has to earn before any of this, that comes first — see what to charge per hour as a freelancer.

Work out the rate underneath the invoiceFind the hourly rate that actually hits your income target.

What actually gets you paid faster

Late payment interest is the remedy everyone reaches for and the one that changes least. It is worth having in the contract, and it is occasionally worth invoking. It is not what moves money. These are, roughly in order of how much difference they make.

1Invoice the day the work is delivered. An invoice sent a fortnight later has already lost a fortnight, and the terms only start when it arrives.
2Send it to accounts payable directly, with your contact copied. Forwarding is a step that can be forgotten.
3Ask at the start of the engagement which day of the month payment runs close, then invoice comfortably before it. Missing a run by one day costs a whole cycle.
4Take a deposit from anyone you have not worked with before. It is the single most effective filter there is.
5Confirm receipt within two days. "Just checking this reached the right inbox" is a question, not a chase, and it surfaces a missing PO while there is still time.
6Make paying trivial — correct bank details on the invoice, a payment link where your client uses one, no need to reply and ask you for anything.

When it is genuinely late

Escalate on a schedule you decided in advance, so the decision is not being made while you are annoyed. Keep every step in writing and every step polite — the invoice is almost always stuck rather than refused, and the person who can unstick it is rarely the person who caused it.

When	Do
Two days after sending	Confirm it arrived and nothing is missing
Due date	A short, friendly note the morning it falls due
Seven days late	Ask your contact directly, and ask what is blocking it
Fourteen days late	Email accounts payable and your contact together, restating the terms
Thirty days late	Pause further work in writing, and state when you will resume
Sixty days late	Formal demand, then a small-claims process or a collections agent

Pausing work is the strongest lever a freelancer has and the most underused. It is not an escalation to be apologised for — it is the normal consequence of an unpaid invoice, and it is far easier to defend when the contract said so before anything went wrong.

One reconciliation note for clients in India: many will deduct tax at source before paying, so the amount that arrives is legitimately less than the invoice. That is a withholding credited against your own tax, not a shortfall — check it against your Form 26AS rather than re-invoicing the difference.

Work out the tax line on an invoiceAdd or remove GST, split across CGST, SGST and IGST.

Frequently asked questions

What has to be on an invoice?: Both parties' legal names and addresses, a unique sequential invoice number, the issue and due dates, itemised work, the total, any tax shown separately with your registration number, and complete bank details. Add the client's purchase order reference wherever they use one.
Can I charge interest on a late payment?: Yes, provided the rate and the trigger were agreed in the contract before the work started. Adding a charge to an overdue invoice that was never mentioned is generally unenforceable and tends to stall the payment further rather than release it.
Should I ask for a deposit?: For any new client, and for any fixed-scope project of meaningful size. Thirty to fifty percent is normal. It covers your exposure if the engagement collapses and it filters out clients who were never going to pay, which is most of its value.
The client says they never received my invoice. What now?: Resend it to accounts payable with your contact copied, keeping the original invoice number rather than issuing a new one. Then ask for the address invoices should go to in future. This is common enough that confirming receipt two days after sending is worth doing every time.
Why is the amount paid less than I invoiced?: Most often tax deducted at source, which the client pays to the tax authority on your behalf and which you reconcile against your own liability. Less often a bank transfer fee, or a deduction the client believes was agreed. Ask for a remittance advice before assuming an error.

Sources

1.GST portal — Central Board of Indirect Taxes and Customs
2.Income Tax Department — Government of India