- What "Cheapest" Actually Means
- The Genuinely Free Tier
The cheapest invoicing software is rarely the lowest sticker price. The real cost is the subscription plus payment processing fees plus the time spent working around feature gaps. This guide compares paid tools under $10/month against the genuinely free options, shows where each one breaks under load, and runs the honest total-cost math for a freelancer or small business sending 5, 25, or 100 invoices a month.
Quick Answer
For most U.S. small businesses, the cheapest invoicing software with a real workflow under $10/month is Billdu (from $4.99/mo), Invoice Ninja Pro (from $18/mo for cloud or free self-hosted), and Wave (free with paid Pro at $19/mo). Genuinely free options that scale are Zoho Invoice (free for unlimited invoices and clients) and Wave Free. The cheapest path including payment fees depends on average invoice size and the share that pay by ACH instead of card.
How we verified this
Subscription prices and processor fees were pulled from each vendor's published pricing page in May 2026. Total cost of ownership scenarios use mid-range U.S. card and ACH rates as published by Stripe, Square, Wave, PayPal, and the major invoicing providers. Where a vendor restricts features below the published price (client caps, branding, payment gateway), we say so explicitly.
Key Takeaways
- Zoho Invoice is the strongest fully-free option with unlimited invoices, customers, and recurring billing, uncommon at $0.
- Wave is free but processes payments at 2.9% + $0.60 per card transaction on the Free plan, dropping to 2.9% + $0 for the first 10/month on Pro.
- Invoice Ninja's self-hosted version is forever free if you can manage a $5/month VPS. Cloud Pro starts at $18/month after a 2026 price increase.
- Billdu at $4.99/month is the cheapest paid tool with iPad-first invoicing, AirPrint, and basic offline mode.
- PayPal Invoicing is free to use but the 3.49% + $0.49 per transaction is roughly $0.60 more per invoice than Stripe-powered alternatives.
- The break-even between "free with high processor fees" and "paid with lower processor fees" is around 8-15 card invoices per month depending on average ticket size.
What "Cheapest" Actually Means
Three numbers determine the cost of invoicing software, and most blog posts only show one of them.
The subscription. $0 to $30/month is the typical range for SMB-grade tools. Headline price.
The payment processing fee. 2.9% + $0.30 to 3.49% + $0.49 per card transaction. ACH usually runs 1% capped at $5 to $25. This is where the real money goes for any business with meaningful invoice volume.
The hidden costs. Client caps that force an upgrade, per-invoice fees on the cheap plan (PayPal), branding on outgoing invoices that costs you on professionalism, missing features that you work around manually.
For a freelancer sending 5 invoices a month at $200 each, the subscription dominates. For a small business sending 50 invoices a month at $500 each, the processor fee dominates. A $0/month tool at 2.9% + $0.60 is more expensive on a $500 invoice than a $7/month tool at 2.9% + $0.30, and the math gets worse as volume scales.
The right way to evaluate is to compute annualized total cost: 12 × subscription + (volume × average invoice × card share × card rate + ACH share × ACH rate). We will do this math explicitly in the comparison section below.
The Genuinely Free Tier
Several invoicing tools are free with no subscription, and they fall into three categories.
Free with full features (Zoho Invoice). Zoho's free plan includes unlimited invoices, unlimited customers, recurring invoices, automated reminders, expense tracking, time tracking, and a customer portal per Zoho's pricing page. Online payments require linking an external gateway (Stripe, Razorpay, 2Checkout) and pay the gateway's standard rate. This is the most generous free tier on the market in 2026.
Free with payment-fee monetization (Wave, Square Invoices Free). Invoicing and basic accounting are free; the vendor earns on payment processing. Wave charges 2.9% + $0.60 per card transaction on Free, 2.9% + $0 for the first 10/month on Pro at $19/month per the Wave pricing page. Square Invoices Free is 3.3% + $0.30 per card, 1% with $1 minimum for ACH per Square's invoice pricing.
Free with hard limits (PayPal Invoicing, Invoice Ninja cloud Free). PayPal Invoicing has no subscription but charges 3.49% + $0.49 per transaction per PayPal's published fees. Invoice Ninja's cloud Free plan supports 5 clients with unlimited invoices per the Invoice Ninja pricing page.
Free with self-hosting (Invoice Ninja open source). Invoice Ninja's self-hosted open-source version is free forever if you run it on your own server. A $5/month VPS (DigitalOcean, Hetzner, Linode) covers it. All enterprise features unlock by default; only the optional white-label license ($30/year) removes "Powered by Invoice Ninja" from invoices.
The right "free" choice depends on what you trade for it.
Paid Under $10/Month
The category of "paid but cheap" is a real one, sub-$10/month plans that offer enough polish to feel like a step up from free without the $20 to $40 per month of mid-tier SaaS.
Billdu starts at $4.99/month per the Billdu pricing page for the Lite plan, with iPad-first invoicing, AirPrint, Apple Pencil signatures, and limited online payment integration. The next tier is around $9.99/month for additional features like reminders and team access.
Invoice Simple starts free for 3 invoices/month, with the Premium plan at $9.99/month for unlimited invoices on iPad and iPhone per the Invoice Simple pricing page. Strong on the App Store but limited multi-device sync.
Invoicely has a free tier (limited invoices and one user) and a Basic plan at $9.99/month for unlimited invoices, multiple users, and online payment options per the Invoicely pricing page.
Invoice Ninja Cloud Ninja Pro starts at $18/month per the 2026 pricing update announcement, which puts it just above the $10 ceiling. The self-hosted version is the workaround for staying under $10 all-in.
The pattern: sub-$10/month tools usually trade away one of multi-user access, online payment options, or advanced features (recurring billing automation, integrations, reporting depth). Choose the tradeoff that hurts you least.
The Sub-$10/Month Comparison Table
The table compares the most-considered tools in this category using published 2026 pricing.
| Tool | Subscription | Card Rate | ACH Rate | Best Free Limit | Multi-Device |
|---|---|---|---|---|---|
| Zoho Invoice (Free) | $0 | Per gateway (Stripe 2.9% + $0.30) | Per gateway (Stripe 0.8% cap $5) | Unlimited invoices and clients | Yes |
| Wave (Free) | $0 | 2.9% + $0.60 | 1% (~$8 cap) | Unlimited invoices | Yes |
| Wave (Pro) | $19/mo | 2.9% + $0 (first 10/mo) | 1% | N/A | Yes |
| Square Invoices (Free) | $0 | 3.3% + $0.30 | 1% (min $1) | Unlimited invoices | Yes |
| PayPal Invoicing | $0 | 3.49% + $0.49 | 1.0% capped $25 | Unlimited invoices | Yes |
| Invoice Ninja (Self-hosted) | $0 (VPS ~$5/mo) | Per gateway | Per gateway | Unlimited | Yes |
| Invoice Ninja (Cloud Free) | $0 | Per gateway | Per gateway | 5 clients | Yes |
| Billdu (Lite) | $4.99/mo | Per gateway | Per gateway | N/A | Yes |
| Invoicely (Basic) | $9.99/mo | Per gateway | Per gateway | N/A | Yes |
| Invoice Simple (Premium) | $9.99/mo | Per gateway | Per gateway | N/A | iCloud sync |
| Billed (Free + Paid) | Free + paid plans | 2.9% + $0.30 | 0.8% cap $5 | Free tier available | Yes |
Original Research: Honest TCO for Three Scenarios
We computed total annual cost across the sub-$10 tools and the genuinely free ones for three realistic scenarios. All scenarios assume 50% card and 50% ACH split, U.S. domestic invoices, no chargebacks. Numbers are annualized.
Scenario 1: Freelancer: 5 invoices per month at $300 average
Monthly volume: $1,500. Annual gross: $18,000. Annual card volume: $9,000 (2.5 invoices × 12 months × $300). Annual ACH volume: $9,000.
| Tool | Annual Sub | Annual Card Fee | Annual ACH Fee | Total |
|---|---|---|---|---|
| Zoho Invoice (Free, via Stripe) | $0 | $279 | $72 (capped) | $351 |
| Wave (Free) | $0 | $297 | $90 | $387 |
| Wave (Pro) | $228 | $0 (first 10/mo, exempt) | $90 | $318 |
| PayPal Invoicing | $0 | $343 | $90 (capped) | $433 |
| Invoice Ninja (Self-hosted, via Stripe) | $60 VPS | $279 | $72 | $411 |
| Billdu (Lite) | $60 | $279 (via Stripe) | $72 | $411 |
| Billed (Free tier, via Stripe) | $0 | $279 | $72 | $351 |
Winner: Wave Pro at $318/year because the first 10 transactions per month run at 2.9% + $0. Below that, Zoho Invoice Free and Billed Free are tied. PayPal is the most expensive.
Scenario 2: Small Business: 25 invoices per month at $500 average
Monthly volume: $12,500. Annual gross: $150,000. Annual card volume: $75,000. Annual ACH volume: $75,000.
| Tool | Annual Sub | Annual Card Fee | Annual ACH Fee | Total |
|---|---|---|---|---|
| Zoho Invoice (Free, via Stripe) | $0 | $2,265 | $600 (capped) | $2,865 |
| Wave (Free) | $0 | $2,355 | $750 | $3,105 |
| Wave (Pro) | $228 | $2,175 (excluding the first 10/mo bonus) | $750 | $3,153 |
| PayPal Invoicing | $0 | $2,764 | $750 (capped) | $3,514 |
| Invoice Ninja (Self-hosted, via Stripe) | $60 VPS | $2,265 | $600 | $2,925 |
| Billdu (Lite) | $60 | $2,265 (via Stripe) | $600 | $2,925 |
| Billed (Free + cheap paid) | ~$120 | $2,265 | $600 | $2,985 |
Winner: Zoho Invoice Free at $2,865/year. The Wave Pro bonus doesn't scale past 10 transactions/month, so Wave Pro stops being cheapest at higher volumes. PayPal is again the most expensive, by $649/year vs. Zoho.
Scenario 3: Growing SMB: 100 invoices per month at $800 average
Monthly volume: $80,000. Annual gross: $960,000. Annual card volume: $480,000. Annual ACH volume: $480,000.
| Tool | Annual Sub | Annual Card Fee | Annual ACH Fee | Total |
|---|---|---|---|---|
| Zoho Invoice (Free, via Stripe) | $0 | $14,280 | $600 (capped at $5/invoice × 1,200) | $14,880 |
| Wave (Pro) | $228 | $14,280 | $7,200 (cap is $8) | $21,708 |
| PayPal Invoicing | $0 | $17,338 | $1,200 (cap is $25) | $18,538 |
| Invoice Ninja (Self-hosted, via Stripe) | $60 VPS | $14,280 | $600 | $14,940 |
| Billed (Cheapest paid) | ~$120 | $14,280 | $600 | $15,000 |
| FreshBooks Lite | $252 | $14,280 | $600 (cap $5) | $15,132 |
Winner: Zoho Invoice Free at $14,880/year, but the gap to Invoice Ninja, Billed, and FreshBooks is now under $300/year, small enough that feature differences should drive the choice. PayPal becomes a $3,658/year mistake at this scale.
The pattern across scenarios. At low volume, Wave Pro's first-10-free bonus wins. At medium volume, Zoho Invoice Free wins by a clear margin. At high volume, the cheapest paid tools (Invoice Ninja self-hosted, Billed, FreshBooks Lite) close the gap to free because their lower processing or matched features start to pay for themselves.
What "Free" Costs You
Free tools save money. They also have costs that do not show up on a pricing page.
Branding. Free plans on most tools place "Powered by [Vendor]" on the PDF and the payment page. This is the easiest way to identify a freelancer using a free tool. For B2B clients evaluating you against more polished competitors, this is a small but real drag on perceived professionalism.
Customer support. Free tiers usually do not include chat or phone support. Email tickets take days. When a customer's payment fails to settle and you cannot figure out why, the absence of immediate support is the most expensive part of free.
Feature ceilings. Wave Free has no time tracking and limited recurring invoice automation. Zoho Free has all features but tighter brand restrictions on the customer portal. Invoice Ninja cloud Free is capped at 5 clients. PayPal has no expense tracking. These ceilings often push the user to upgrade within 6-12 months.
Payment gateway lock-in. Most "free" tools require you to connect a payment processor (Stripe, Square, PayPal, Razorpay). If you switch processors later, you have to rebuild the integration and migrate customer payment methods. The free tool didn't cost you, but the processor lock-in did.
Reconciliation overhead. Free tools often have weaker bank-reconciliation features. You spend more time matching incoming deposits to invoices manually. This is invisible until you scale past ~30 invoices a month, at which point it becomes the biggest hidden cost.
What Paid Buys You at $5 to $10
The next $5 to $10 per month over free buys, in roughly this order of value:
Brand removal. Your logo on every PDF and payment page, no "Powered by" footer.
Email and chat support. Real humans within a reasonable window. The difference between waiting 4 hours and waiting 4 days when a customer cannot pay matters more than most features.
Recurring billing automation. Most free tools handle recurring invoices but make you re-confirm or manually re-enable each cycle. Paid plans automate the full cycle.
Multiple users. Adding a bookkeeper, an assistant, or a partner account. Free tiers often cap at one user; paid tiers at $5-$10 usually allow 2-3.
Integrations. QuickBooks Online sync, bank feed, Zapier, Make. Free tiers limit or block these.
Lower processing rates on payments. Wave Pro's first-10-free bonus, Square Plus's lower card rate, FreshBooks Premium's better ACH cap. Sometimes the higher subscription pays for itself in processor savings.
The cheapest path that buys most of these benefits is usually a paid plan around $5 to $10/month plus a Stripe-based processor at 2.9% + $0.30.
When This Guide Isn't For You
This page is for U.S. and Canadian SMBs and freelancers picking the cheapest invoicing software that can still do real work. It is the wrong fit if:
- You bill more than $1M annually and need negotiated interchange-plus pricing through a direct merchant acquirer. The processor fees in this list (flat-rate) will cost meaningfully more than a custom-priced setup.
- You need true free that includes ALL features with no payment-processor strings attached. This does not exist in 2026 from any commercial vendor. The closest is Invoice Ninja self-hosted, which costs ~$60/year in server fees and requires Linux administration.
- You need country-specific e-invoicing compliance (Italy SDI, France PPF, Poland KSeF) baked in. Most cheap tools handle the basics but full mandated structured-format compliance often requires a paid plan or a country-specific vendor. See our e-invoicing guide for country-by-country detail.
- You require strong audit trails for regulated industries (medical, legal, government contracting). Cheap tools usually do not satisfy SOC 2 Type II or HIPAA BAA requirements out of the box.
Frequently Asked Questions
What is the cheapest billing software?
For zero-subscription with unlimited invoices and customers, Zoho Invoice Free is the most generous in 2026. For zero-subscription with the option to scale, Wave Free (with optional Pro at $19/month) is the next strongest. For sub-$10/month paid plans, Billdu (from $4.99/month) and Invoice Simple Premium ($9.99/month) are the polished options. The cheapest path of all is Invoice Ninja self-hosted, which costs only your VPS bill (~$5/month).
Is Zoho Invoice 100% free?
Yes, for the core invoicing workflow. Zoho's pricing page confirms the free plan includes unlimited invoices, unlimited customers, recurring invoices, automated reminders, time tracking, expense tracking, and a customer portal. Online payments work but require linking an external gateway (Stripe, Razorpay, 2Checkout). The gateway charges its standard rate; Zoho does not collect a processor fee on top.
How can I invoice without paying fees?
If "fees" means subscription fees: Zoho Invoice Free, Wave Free, Square Invoices Free, PayPal Invoicing, and Invoice Ninja are all $0 subscription. If "fees" means payment processing fees: the only way to avoid them is to accept payment by check or wire and skip online payment processing entirely. The tradeoff is slower collections, see the QuickBooks data showing online payment invoices are paid up to 4x faster than paper invoices.
What is the best free invoicing software for small business?
For most U.S. small businesses, Zoho Invoice Free is the strongest in 2026 because it includes unlimited invoices, customers, recurring billing, and a customer portal at $0. Wave is the next-strongest free option, especially for businesses that want basic accounting alongside invoicing. Both options have honest tradeoffs around branding and payment-processor lock-in, but they deliver a real workflow at no subscription cost. See our free vs paid comparison for the detailed picture.
Should I use Invoice Ninja self-hosted to save money?
If you are comfortable provisioning a Linux VPS, running occasional updates, and managing SSL certificates, Invoice Ninja self-hosted is the cheapest realistic option at ~$60/year. If those tasks sound like work you would rather not do, the cloud free plan (5 clients) or any of the Zoho/Wave/Billed options will save you the IT time cost.
Does cheap invoicing software scale?
It depends on the tool. Zoho Invoice Free scales to thousands of invoices. Wave scales to small-business volumes but reporting gets thin. Invoice Ninja self-hosted scales as far as your server can handle it. PayPal Invoicing scales technically but becomes more expensive than any alternative past ~$50K/year in card-payment volume because of the per-transaction fee structure.
Authoritative Sources
For verification and further reading:
- Zoho Invoice Pricing, confirms free plan limits
- Wave Pricing, confirms Pro plan and processing fee structure
- PayPal Merchant Fees, confirms 3.49% + $0.49 invoice rate
- Invoice Ninja 2026 Pricing Update, confirms January 2026 price changes
- Stripe Pricing, processor rates for tools using Stripe
- Federal Reserve Payments Study, payment-rail context
Putting It Together
The cheapest invoicing software is rarely the one with the lowest sticker price. For 5 invoices per month, Wave Pro is the cheapest TCO because of its first-10-free bonus. For 25 to 100 invoices per month, Zoho Invoice Free dominates if you can tolerate the branding. For the absolute cheapest with full features and no string attached, Invoice Ninja self-hosted at ~$60/year is unbeatable if you are technical enough to run it.
If you want a paid tool that gives you brand removal, real support, recurring billing automation, and Stripe-grade payments under $10/month-equivalent, try Billed free and upgrade only if and when your usage warrants it.