How the math works
Net 30 means the full amount is due 30 calendar days after the invoice date — not business days, and not the day the client opens the email. An invoice dated August 4 with Net 30 terms is due September 3. Print that date next to the term ("Net 30 — due September 3, 2026") and nobody has to count. The full convention — early-payment variants like 2/10 Net 30, and when shorter terms fit a small business better — is in What Does Net 30 Mean on an Invoice?
Calculator
- Payment is due
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- Days after the invoice date
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Print this next to your total
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Calendar days — weekends and holidays count. If the due date lands on a weekend, the client paying late the following Monday is still late; print the date and let them plan around it.
Which term should you use?
Whatever you and the client agreed before the work — the invoice states the policy, it doesn't create it. Net 30 is a corporate accounts-payable default, not a law of nature: for small jobs and homeowners, due on receipt, Net 7, or Net 14 are normal and reasonable. Whatever you pick, the move that gets you paid is printing the actual date next to the term.
And if the due date comes and goes? A short, friendly reminder the day after is normal and professional — and if your terms include a late fee, the late-fee calculator sizes what the lateness costs, with the policy line to print on every invoice.
Next step
Put the computed date on your next invoice and say the term while you record the job — "net seven, due September 2nd" — so the PDF carries both the policy and the deadline.
If the date keeps slipping because the job was underpriced in the first place, the hourly rate calculator checks the rate; all three tools are on the free invoice tools page.
Voice Invoice turns a spoken description of the job — payment terms included — into a client-ready PDF invoice with the due date computed for you. Free for 3 invoices a month.
Download Voice Invoice on the App Store