For a lot of solo business owners, invoicing is the part of the job nobody warned you about. You did the work, you did it well, and now you’re staring at a blank document wondering what a “proper” invoice is even supposed to look like. Get it wrong and you end up chasing payment for weeks. Get it right and the money shows up quietly, on time, without you having to think about it.
Here’s how to get it right.
To invoice clients and get paid on time, agree payment terms before the work starts, then send a clear invoice the day the work is done. Include a unique invoice number, a specific due date, itemised line items, the total with any tax shown separately, and simple payment instructions. If it slips past due, follow up politely a day or two later.
What every invoice needs
An invoice is a legal request for payment, not a friendly note. It should leave zero ambiguity about who owes what, for what, and by when. At a minimum, include:
- Your business name and contact details — and the client’s too.
- A unique invoice number. Sequential is easiest (INV-001, INV-002). You’ll need this for your records and taxes — invoice numbering and record keeping covers what tax authorities expect.
- The issue date and a clear due date. “Due on receipt” is vague; “Due by 14 September 2025” is not.
- An itemised list of work with a short description, quantity or hours, rate, and line total.
- The total amount due, with any tax broken out separately.
- Payment instructions — bank details, a payment link, whatever you accept.
That last one matters more than people think. Every extra step between “I want to pay this” and “it’s paid” is a chance for the invoice to get buried.
Set payment terms before you start
The best time to agree on how you’ll be paid is before you’ve done a single hour of work. Put your terms in the proposal or contract: your rate, when invoices go out, the payment window (Net 7, Net 14, Net 30), and what happens if payment is late. “Net 14” simply means payment is due within 14 days of the invoice date. For larger projects, it’s also the moment to decide whether to ask for a deposit.
Shorter terms are almost always better for a solo business. Net 30 is a corporate default that made sense when invoices moved by post. You are not a corporation with a treasury department. Net 7 or Net 14 keeps your cash flow healthy and signals that you take payment seriously.
When to send an invoice: immediately
The single biggest lever on how fast you get paid is how fast you invoice. An invoice sent the day you finish is far more likely to be paid promptly than one that lands three weeks later, when the client has mentally moved on and the budget has been reallocated.
Build invoicing into the end of every project or the same day each month. Don’t let it pile up into a dreaded quarterly admin session. If you need something to send in the next ten minutes, our free invoice generator will build a proper one and hand you the PDF — no account, no watermark.
Make the numbers impossible to argue with
Disputes and delays usually trace back to a client not understanding a charge. Head this off by being specific. Instead of “Design work — $2,000,” write “Homepage redesign (3 concepts + 2 revision rounds) — $2,000.” When the line item matches what you actually agreed to deliver, there’s nothing to question. For a line-by-line breakdown, see the anatomy of an invoice that gets paid fast.
Following up on a late invoice
Late payments happen to everyone. A polite, matter-of-fact reminder a day or two after the due date is completely professional — it is not nagging. Most late invoices are simply forgotten, not refused. A calm nudge usually solves it, and if it doesn’t, here’s how to keep chasing late invoices politely.
Frequently asked questions
Should I invoice before or after the work is done?
For most freelance projects you invoice after the work is delivered, but larger or longer jobs are safer split into a deposit up front and the balance on completion. Ongoing work is usually invoiced monthly or at each milestone. Whatever the rhythm, agree it in writing before you start so the first invoice isn’t a surprise.
Can I charge a late fee on an unpaid invoice?
You can usually charge a late fee if it was agreed in your contract or terms before the work began. Adding one after the fact rarely holds up and tends to sour the relationship. Some countries also give businesses a statutory right to interest on late commercial payments, so it’s worth checking what applies where you and your client are based.
What is the difference between an invoice and a receipt?
An invoice asks for payment; a receipt confirms that payment has been made. You send the invoice when the work is done and the money is owed, and a receipt — or a paid status on the invoice — once the client has paid. Both belong in your records, because together they show what you billed and what actually arrived.
Do I need to put tax on my invoices?
You only need to charge tax such as VAT, GST or sales tax if you’re registered for it, or required to be, where you do business. If you are, show the tax rate and amount as a separate line from the net total. If you’re not, some jurisdictions still expect the invoice to make that clear, so check the local rules.
Where Billable comes in
Everything above is straightforward — and also exactly the kind of thing that quietly eats your evenings when you’re doing it by hand in a word processor and a spreadsheet. That’s the problem Billable was built to remove.
You create a clean, professional invoice in a couple of clicks — numbering, dates and totals handled for you. Your clients and their history live in one place, so you’re never re-typing details. And when an invoice slips past its due date, Billable sends a polite reminder for you, automatically, so you get paid faster without the awkward follow-up. It’s invoicing and finances for solopreneurs, for a flat $9 a month. If chasing payments is stealing your focus, give it a try.