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Invoicing Basics and the Best Invoicing Software for Freelancers

Choosing the best invoicing software for freelancers is easier once you know what a good invoice needs. This guide covers the basics: the essentials to include, payment terms, invoice numbering, sending promptly and following up politely. You can then judge any tool by how well it handles them.

Clear invoices help you get paid on time and avoid confusion, and a free basic CRM can help you keep track of who owes what. That sounds obvious, but I didn't really get it until my first freelance client paid me three weeks late. Why? Because my "invoice" was a friendly email that said, "Here's what I owe... A message like "here's what is owed" with no date, no due date, and no number is not a real invoice. Just vibes.

If you're new to freelancing, invoicing can feel like a chore you'll figure out later. That advice deserves some pushback. A simple, tidy invoice takes ten minutes to set up once, and it saves you a lot of awkward chasing. Here's what I've learned, mostly the hard way, and it applies whether you use invoicing software for freelancers or a plain template.

Freelance invoice basics: include the essentials

Every invoice needs a few basic pieces. Skip one and you'll probably get a reply asking for it, which delays your payment.

• Your details: your name or business name, email, and any address or contact info your client needs.
• The client's details: their name, company name, and the person who handles payments if you know it.
• The invoice date: the day you send it.
• An invoice number: more on this below.
• What the work was: a short description of each task or deliverable, plus the amount for each.
• The total: clearly marked, so nobody has to add it up.

For the work description, be specific without writing an essay. "Website copy" is vague. "Homepage and About page copy, two rounds of edits" is much better. If the client's finance person has never heard of you, they should still understand what they're paying for.

One thing I'd mention: depending on where you live and the kind of work you do, there may be tax details you're supposed to include. This post can't tell you what applies to your situation. A local accountant or your tax office's website is the place to check.

State the payment terms

This is the part I left out at first, and it's the one that matters most for getting paid on time. Payment terms tell the client two things: when the money is due, and how to send it.

For the due date, I like writing an actual date instead of a phrase like "Net 30." Some clients know what Net 30 means. Plenty don't. "Due by March 15" leaves no room for guessing.

For how to pay, list the methods you accept and the details they'll need. If you take bank transfers, include the info required. If you use a payment app, say which one and what name or email to send to.

Here's a simple example of a terms line:

Payment due by March 15. Please pay by bank transfer to the account below, or contact me if you need another option.

Short, clear, done. If you agreed on terms in a contract or email before starting, make sure the invoice matches. Mixed messages are how invoices end up sitting in someone's inbox.

Number every invoice

Honestly, I thought invoice numbers were a bit fussy for a one-person business. Then I had two invoices for the same client with the same amount, and they paid one and asked which one it was. It is easy to be unsure how to answer.

A simple sequence fixes that. You don't need anything fancy. A few options that work:

• Plain numbers: 001, 002, 003
• Year plus number: 2024-001, 2024-002
• Client initials plus number: AB-001, AB-002

A year-plus-number style (like 2025-014) is easy to sort, and you can tell at a glance roughly when something was sent. Pick one and stick with it. The worst system is the one you change every few months.

Clients like invoice numbers too. Their accounts team can reference it in emails, and you both know exactly which bill you're talking about.

Send your invoice promptly

Send the invoice when the work is delivered. Not a week later when you finally feel like doing admin. The day you hand over the files is usually the best day, because the client is happy and the work is fresh in their mind.

A common mistake is batching invoices at the end of the month to "save time." If a client's payment cycle has already closed, your invoice gets pushed to the next cycle. A few days of laziness turned into weeks of waiting.

For bigger or longer projects, think about splitting payments. Some freelancers ask for a deposit up front, then invoice the rest at milestones or at the end. That's something to agree on before you start, not something to spring on a client halfway through.

Quick side note: if your desk, like mine, tends to swallow receipts and sticky notes, you might like the Free Dollar-Store Organization Shopping List you get for joining our email list.

Follow up politely

Late payments happen. Most of the time it isn't bad intent. The invoice got buried, the person who approves payments was on holiday, or someone forgot. A short reminder is normal and professional, and you don't need to feel weird about it.

Here's roughly how I handle it:

1. A day or two after the due date: a friendly note. "Hi Sam, just checking that invoice 2024-014 came through okay. It was due on the 15th. Let me know if you need anything from me."
2. About a week later: a slightly firmer note, with the invoice attached again and the amount and due date in the email itself.
3. After that: a phone call or a message to a different contact, like their accounts team.

Keep it calm and short. Long, emotional emails rarely speed anything up. If a client keeps paying late, that's useful information for whether you take on their next project, or whether you ask for payment up front next time.

If a payment dispute gets serious, that's when to talk to a professional instead of trying to sort it out alone.

Keep a log with a simple bookkeeping checklist

This is the boring habit that pays off. Track what you sent, when you sent it, and whether it was paid. That's it.

A basic log might have these columns: invoice number, client, date sent, amount, due date, date paid. A spreadsheet such as Google Sheets works fine as free accounting software for freelancers when you're just starting out. So does a paper notebook if you're the kind of person who actually opens it. If you're not, keeping yours on a laptop works, though some freelancers swear by paper.

The log works like light bookkeeping and helps in a few ways. You can see at a glance who owes you money. You know when to send reminders. And when tax time comes around, you're not digging through old emails trying to remember what you earned in June.

If you'd like something ready-made, the Freelancer's Money and Business Log Book below this post is built for exactly this kind of tracking. And if setting up your whole system feels like too much, the Bookkeeping and Invoice Setup Service Kit, also below, can help you get the basics in place.

A few things I'd skip

New freelancers often overthink invoicing. You don't need custom-designed invoices with your logo in five colors. Clean and readable beats pretty. You also don't need pricey invoicing software on day one, since a free invoicing tool or a simple template does the job. Move to online invoicing software such as FreshBooks or Wave once you have enough clients that things start to feel messy.

The one thing I wouldn't skip? Writing down your terms before the work starts. It makes the invoice feel like a formality instead of a surprise.

Invoicing tools worth a look

You don't need all of these, and a simple template works fine at the start. Here are some well-known options to consider once you want a bit more help with invoices and tracking.

FreshBooks

An invoicing and accounting tool aimed at freelancers and small service businesses. It suits people who want invoicing and bookkeeping in one place. Check which plan covers the number of clients you have.

Wave

A small business finance app that includes invoicing and basic accounting. It suits new freelancers who want to start light. Check which features are free and which are paid add-ons for your situation.

PayPal

A widely used payment service that lets you send invoices by email. It suits clients who already like paying this way. Check the fees and how long it takes to move money to your bank.

Zoho Invoice

An online invoicing tool from Zoho. It suits freelancers who may later want other Zoho business apps. Check whether it handles your currency and tax needs.

QuickBooks

A popular accounting package from Intuit. It suits freelancers who expect to grow and want fuller bookkeeping. Check whether it is more than you need right now, and ask your accountant if they prefer it.

Stripe

A payment platform that can send invoices and take card payments. It suits freelancers who want clients to pay by card. Check the processing fees and the setup steps before you rely on it.

Google Sheets

A free spreadsheet tool that works well for an invoice log. It suits anyone who wants a simple, no-cost tracker. Check that you keep a backup and a consistent column layout.

Please check current plans and prices on each brand's own site before you decide.

FAQ

Should I send my freelance invoice as a PDF or in the email body?

You can send a PDF. It looks more professional, it's easy for clients to forward to their accounts team, and the formatting doesn't get scrambled. You can still put the total and due date in the email so they see it right away.

What if I forgot to number my early invoices?

Don't stress. Just start numbering from your next invoice and note in your log which older ones went out without numbers. Nobody expects a perfect system from your first week.

How long should I give clients to pay?

There's no single right answer. Some freelancers ask for payment on receipt, others give a couple of weeks or a month. Pick what works for your cash flow, agree on it with the client before starting, and put the exact date on the invoice.

Can I charge a late fee?

Some freelancers do, but it should be agreed on in advance, not added after the fact. Rules about late fees can vary depending on where you are, so check with a local professional before adding one to your terms.

Summary

Good invoicing isn't complicated, and the best invoicing for freelancers is usually the simplest. Include the basics, write a clear due date and how to pay, number each invoice, send it as soon as the work is done, follow up kindly when needed, and keep a simple log. Do those things and you'll spend a lot less time wondering where your money is.

Your next step: grab the Free Dollar-Store Organization Shopping List by joining the email list in the box on this page, then take a look at the Freelancer's Money and Business Log Book and the Bookkeeping and Invoice Setup Service Kit below this post if you want a little help getting your system set up.

Printables and the best invoicing software for freelancers