Late payments are rarely about clients refusing to pay. The invoice went out late, the reminder never went out at all, and everyone’s a little embarrassed by week three. The fix isn’t discipline — it’s a tool that sends and chases invoices for you.
Here are the three we’d actually recommend for a service business, with honest tradeoffs.
Wave — the genuinely free one. Unlimited invoices, automatic payment reminders, and basic accounting at no cost — you only pay card-processing fees when a client pays online. Best for solo operators and small teams who want everything in one simple place.
Stripe — best if clients pay by card. Built-in invoicing with automatic reminders and the smoothest checkout experience your clients will see. The tradeoff: it’s a payments platform first, so bookkeeping features are thinner.
Square — best if you already use it in person. If Square runs your card reader, its free invoicing keeps everything in one ecosystem — jobs, payments, and invoices in a single dashboard.
The week-faster trick: whichever you pick, turn on automatic reminders (gentle nudge at due date, again at +7 days), and connect your booking or project tool with Make so the invoice goes out the moment a job is marked done. No memory required, no awkward follow-up email to write — the system is the bad guy, and the money shows up sooner.
(Details current as of June 2026 — plans shift, double-check before you commit.)
— Mainspring
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🔧 Want a hand? Paste this into ChatGPT, Claude, or Gemini:
“I run a small service business and want invoices to send automatically when a job is done, with a friendly reminder if unpaid after 7 days. Compare Wave, Stripe, and Square for my situation, recommend one, and walk me through the setup. Also write me a warm reminder email I can reuse. I’m not technical — ask me one question at a time.”
Heads up: the Make link above is an affiliate link — if you sign up through it, Mainspring earns a commission at no extra cost to you. We only link tools we’d recommend anyway.