How we make money: some links on this page are affiliate links. If you sign up through one, we may earn a commission at no extra cost to you. It never changes which tool we recommend — picks are scored before we check whether a product has an affiliate programme at all. How we research · Full disclosure.
What this is: a research-based comparison built from published pricing, plan documentation and payment-processor fee schedules, verified July 2026. We have not yet run these tools hands-on. When we do, this page will be updated and marked accordingly. We would rather tell you that than imply testing we haven’t done.
If you are invoicing a handful of clients, you should not be paying a monthly subscription. The free tiers in this category are genuinely usable — the real cost is hidden in payment processing fees, and that is where the difference between these tools actually shows up.
The short answer
Free with no platform cut, and you bring your own Stripe or PayPal account — so you pay only the processor’s rate.
Genuinely unlimited invoices and clients. Built-in accounting. See the caveat below before committing.
The lowest in-person rate here, and the same account handles card-present payments.
The comparison
| Tool | Subscription | Invoice limit | Online card fee | Best for |
|---|---|---|---|---|
| Zoho Invoice Best overall | Free | Disputed — see note | Your processor’s rate | Lowest total cost |
| Wave | Free | Unlimited Unlimited | 2.9% + $0.60 | Invoicing plus basic books |
| Square Invoices | Free | Unlimited Unlimited | 2.9% + $0.30 | In-person + online |
| PayPal Invoicing | Free | Unlimited Unlimited | 3.49% + $0.49 | Clients who already use PayPal |
A disagreement we could not resolve. Sources conflict on whether Zoho Invoice’s free plan caps you at 500 invoices per year or is genuinely unlimited. Some documentation describes a 500/year cap with 2 users and 3 projects; other current write-ups describe no artificial limit on invoices or clients. We have not been able to verify which applies to new 2026 signups. If you expect to send more than 500 invoices a year, confirm the current limit with Zoho before committing.
Why the subscription price is the wrong thing to compare
Every tool here costs nothing per month. So the only number that matters is what you lose per payment.
On a $2,000 invoice paid by card, the spread across these tools is roughly $58 with Wave, $58.30 with Square online, and $70.29 with PayPal. Over a year of steady invoicing that difference is not trivial — it is the largest cost in the entire stack, and it is the one most comparison articles skip past.
Two ways to reduce it. Take ACH or bank transfer where you can: Wave charges 1% with a $1 minimum, which on that same $2,000 invoice is $20 instead of $58. And for larger invoices, ask. Many clients will pay by bank transfer without complaint if you simply offer it as an option.
Zoho Invoice — best overall
The structural advantage is that Zoho does not take a platform cut. You connect your own Stripe or PayPal account, and you pay that processor’s rate and nothing else. Where Wave and Square are payment companies that give away invoicing, Zoho is a software company giving away software.
What works
- No platform fee on payments — only your processor’s rate
- Client portal, multi-currency and recurring invoices on the free tier
- Time tracking included, which matters if you bill hourly
- Sensible upgrade path if you later need full Zoho Books
What doesn’t
- The free-tier invoice limit is genuinely unclear — verify before relying on it
- Interface is denser than Wave’s; more to learn up front
- Pulls you toward the wider Zoho ecosystem
- We have not tested the payment flow end to end
Wave — runner-up, with a caveat worth reading
Wave’s free tier is unusually generous: unlimited invoices, unlimited clients, unlimited estimates, plus expense tracking and reporting. For someone who wants invoicing and light bookkeeping in one place at zero subscription cost, it is the obvious pick.
The caveat: there are documented user reports — circulated widely in February 2026 — of Wave freezing funds after payments were received. We have not independently verified these reports, and we do not know how common the problem is. But when a tool sits between you and your income, it belongs in your decision. If your cash flow cannot absorb a hold, weigh that seriously.
Square and PayPal — narrower cases
Square Invoices makes sense if any part of your work is paid in person. At 2.6% + $0.10 card-present, it is the cheapest in-person rate here, and one account covers both situations.
PayPal Invoicing has the highest fees of the four at 3.49% + $0.49. The case for it is friction, not price: if your clients already pay by PayPal and resist changing, the higher fee may cost less than the delay of arguing about it.
Questions people actually ask
Is free invoicing software actually free?
The subscription is. The payments are not. Every tool here makes money on processing, or expects you to upgrade later. That is a fair trade — just budget for the percentage rather than assuming zero.
When is it worth paying for invoicing?
When the invoicing stops being the job. Paid tools earn their money on proposals, contracts, recurring retainers and accounting integration. If you are chasing more than a few payments a month, or need books your accountant can work from, the paid tier starts paying for itself.
Can I switch later?
Usually, but check export before you commit, not after. The question to ask any of these tools is whether you can get your client list and invoice history out in a usable format. It is the least glamorous feature and the one you will care most about the day you want to leave.
Our verdict
Start with Zoho Invoice. It has the lowest total cost because it does not take a cut of your payments, and the free tier covers what a solo business actually needs. Verify the invoice limit for your volume first.
Choose Wave instead if you want invoicing and bookkeeping together and have read the funds-hold caveat. Choose Square if you are ever paid in person. Choose PayPal only if your clients insist on it.
Sources. Pricing and plan details verified July 2026 against published vendor pricing pages and independent comparisons including Zapier’s free invoicing round-up, Capterra’s Zoho Invoice vs Wave comparison, and Bluevine’s 2026 invoicing guide. Payment processing rates are the published standard rates and may vary by country and account type. Fees change — confirm current rates with the provider before deciding.