Can you run a business without invoicing software?

Most founders don’t start off using invoicing software. In the early days, a spreadsheet, PDF, or invoice template usually gets the job done, as long as your records accurately show when and how much income was earned and who paid you. But as your business’s transaction volume picks up, invoicing will likely become more complicated, making it harder to stay organized and increasing the risk of errors. 

The right invoicing setup depends on the size of your business and how much administrative work your team can realistically manage, before the work involved with invoicing starts preventing growth.

Here, we'll cover the ins and outs of business invoicing, including how to invoice customers without using accounting software, what to include in an invoice, and signs it's time to upgrade your invoicing process.

When founders are figuring out how to invoice customers without accounting software, they usually rely on a few common manual methods to bridge the gap. (And if you’re wondering, "Can you create invoices in Excel?" the answer is yes.)

Word docs, PDFs, and email

If you only need a basic invoice that outlines deliverables and the final cost, you can e-invoice without software by compiling the details in an email or filling in a Word template. This approach can work for one-off projects, but it’s not as visually polished. 

Brand optics aside, the IRS recommends keeping financial records for at least three years — and relying on a desktop folder of disconnected files makes staying compliant at tax time unnecessarily difficult.

Spreadsheets

Spreadsheet products, like Excel or Google Sheets, can be helpful because they handle basic math for you. You can build a template, plug in your line items, and let the formulas calculate your totals. 

But there’s also a downside: Spreadsheets require a lot of attention to detail. If you accidentally overwrite a previous file, duplicate an invoice number, or break a formula, you’ll risk undercharging a client or miscalculating your taxes.

Invoice generators

If you need to send a professional-looking document but aren't ready to commit to an accounting platform, you’ve likely searched, "Is there a free invoice maker?" And yes, free options exist.

Free browser tools offer a helpful middle ground between spreadsheets and invoicing software. Mercury’s free invoice generator gives you a polished result without forcing you into a complex financial system. You just plug in your details, add a logo, and download a clean PDF.

It’s important to include enough details for a client to keep accurate records on their side. When making a simple invoice, make sure to include all the information your clients need to pay you quickly:

1. Document title: It must clearly say “Invoice” at the top, so clients know exactly what it is — and prioritize it accordingly.
2. Contact details: Include your business name and contact info, plus your client’s exact billing details. Sending a bill to a general company inbox without a specific name often causes delays. 
3. A unique invoice number: Make sure to include a sequential number on every bill. This will make it easier to track payments and keep your tax records straight.
4. Dates: Clearly state the issue date and the exact due date.
5. Clear line items: Break down the work you’ve completed with specific descriptions, quantities, rates, and totals. If you’re charging sales tax or VAT, you must show a clear breakdown of those specific rates.
6. Payment terms: Explain how you expect to be paid, whether it’s by wire transfer, ACH, or check. Be sure to identify any late fees upfront. 

Also, giving your clients a single button to pay via card or ACH directly inside the invoice speeds up the entire payment cycle.

In the early stages of a business, the answer to the question, “Do I need invoicing software for small business?” is often “not yet.” But eventually, the opportunity cost of all that hands-on work will outweigh the money you’ll save on subscription fees. Here are signs that your manual invoicing systems are starting to fail. 

Too much time spent creating and tracking invoices

Correcting duplicated files, updating dates, and double-checking formulas can pull you away from business-critical tasks that help scale your company. Every hour spent doing manual bookkeeping work is an hour you’re not spending on product or sales.

Missed payments and lack of visibility 

When you’re managing bills in a spreadsheet, it’s easy to forget to follow up on an email or overlook a past-due account. Manual math errors can also lead to accidentally undercharging a client. Without a clear view of who owes you what, you’re basically relying on your clients to remember to pay you. 

Scaling challenges as volume increases

As you begin sending out more invoices, disconnected spreadsheets and files become harder to manage across your business. Without a reliable system, it becomes harder to predict when payments will clear, making payroll and cash flow planning more stressful.

You might be asking yourself, “Do I really need invoice software?” And the reality is that many small businesses can operate without it for quite a while. But at a certain point, your invoicing process either helps your business run smoothly or slows everything down. If you’re spending more time chasing checks and matching deposits than closing deals, it might be time to upgrade to an invoicing platform.

Signs you’ve outgrown manual or free systems

There’s no magic revenue milestone that’ll tell you it’s time to upgrade your invoicing software, but here are a few signs:

• Increasing transaction volume: You’ll know you’ve outgrown your current setup when transaction volume jumps and the time you spend on invoicing starts eating into time you’d rather spend elsewhere.
• Hiring: Hiring is another major trigger. If you bring on a bookkeeper, for example, you can’t hand them a messy shared drive. They’ll need a centralized system to do their job. 
• Working with global suppliers: Finally, if you need to start billing through an API or managing multi-currency invoices for international clients, your manual spreadsheet may no longer cut it.

Benefits of automation

Dedicated invoicing software often includes automation, which can handle edge cases and busywork, freeing you up to focus on other aspects of your business. Here are a few examples:

• Canceling an invoice: If a finalized invoice needs to be canceled, the software could automatically issue a linked credit note, so you don’t have to delete the file and mix up your tax records. 
• Replicating line items: You can also save your standard services in a product catalog, so you never have to type out line items from scratch.
• Collecting payment: You could set up invoicing software to take over the collections process. It can send automated payment reminders, so you don’t need to personally email your clients when late payments need chasing down. 

When you’re ready to move past spreadsheets and templates, choose an invoicing platform that truly makes life easier for you, your team, and your customers. Tools that add complicated steps or a steep learning curve defeat the purpose. Here’s what to look for.

Ease of use, automation, and payment collection

Look for features that automate your most repetitive tasks, like recurring invoice scheduling and payment reminders. Your setup should also make it easy for customers to pay. For instance, using secure virtual account numbers on your invoices helps to protect your actual bank details while giving customers the flexibility to pay via credit card, Apple Pay, or wire.

Integration with business bank accounts

You don’t necessarily have to buy a standalone tool to get these features. Adding another subscription often means you’ll still have to reconcile paid invoices against your bank data at the end of the month. Instead, you can invoice directly from your business bank account.

Platforms like Mercury provide an alternative to both manual billing and traditional accounting software. Because your invoicing lives in the exact same place that your money lands, incoming payments match up to the right invoices automatically. This dramatically reduces the need for manual reconciliation.

The best invoicing system is the one that matches your current stage of business, without creating extra work six months from now. When you’re just getting off the ground, a spreadsheet or a free template might be all you need. But as your business scales, your financial stack needs to scale with it. 

Ultimately, your financial setup shouldn’t require all your attention. Explore how Mercury can help with invoicing, so you can spend more time actually running your company.