ToolNestFree Invoice Due Date Calculator
Last updated: October 23, 2026
Quick answer: A Net 30 invoice sent on October 23, 2026 is due Sunday, November 22, 2026 — and if your contract rolls weekend due dates forward, that becomes Monday, November 23. Get that rollover wrong and you either chase a payment a day early or forgive a day of lateness. This free invoice due date calculator settles it: enter the invoice date and the payment terms — Net 7 through Net 90, Net 30 EOM, or the classic 2/10 Net 30 discount — and it returns the exact due date with its weekday, the discount deadline and dollar discount where one applies, and days remaining or overdue against today, plus a comparison of the same invoice under Net 15, 30, 45, and 60. Everything runs in your browser; your invoice amounts never leave your device.
Net terms count calendar days from the invoice date unless your contract says otherwise. EOM terms count from the last day of the invoice month, not the invoice date — a September 15 invoice on Net 30 EOM is due October 30, a full month later than straight Net 30 (October 15). This tool rolls weekend due dates only; it does not model public holidays, and 2/10 discount periods use calendar days. When the contract is silent, confirm the basis in writing before you enforce a deadline.
✓ Free forever · ✓ No signup · ✓ Tool inputs stay in your browser — never sent to our servers.
How to Use the Invoice Due Date Calculator
- Enter the invoice date — the date printed on the invoice, not the date the work finished or the goods arrived. If the field is empty, it defaults to today.
- Pick the payment terms exactly as written on the invoice. Net 30 is the default; Net 30 EOM and 2/10 Net 30 are separate options because they compute from different starting points.
- If the terms are not a standard Net number, choose custom days (or EOM + custom days) and enter the count. The tool counts from the invoice date for Net terms and from month-end for EOM terms.
- Choose the counting basis: calendar days is the standard for Net terms; switch to business days only if the contract genuinely counts working days. Leave the weekend roll ticked if your contract moves weekend due dates to Monday.
- Press Calculate due date. Read the due date and its weekday first, then the discount deadline (2/10 terms only), then days remaining or overdue — and check the comparison table before you renegotiate terms.
Why Use Our Invoice Due Date Calculator?
- Every common term type — Net 7 through Net 90, custom day counts, Net 30 EOM, EOM + custom, and 2/10 Net 30, each computed from its correct starting point instead of one lazy '+N days' formula.
- EOM done right — a September 15 invoice on Net 30 EOM is due October 30 (September 30 month-end + 30 days), not October 15; that 15-day gap is the single most common due-date dispute.
- Discount math included — on 2/10 Net 30 terms, the tool shows the 10-day discount deadline and the dollar discount on your invoice amount, so the 'pay early or pay full' decision has a number attached.
- Days remaining or overdue, vs today — not just a date but a status: 21 days left, due today, or 12 days overdue, computed against the current date.
- Weekend roll + business-day counting — optional roll of Saturday/Sunday due dates to Monday, and a business-days-only mode for contracts that count working days; the page states plainly that public holidays are not modeled.
- Same-invoice comparison table — see the same invoice under Net 15, 30, 45, and 60 at a glance, which is the table you actually want when a customer asks for longer terms.
Common Use Cases
- A freelancer chasing Net 30 payments: You sent five invoices this month on different dates. Run each invoice date through the tool, sort the results by due date, and your chase list writes itself — earliest due first, with the overdue ones flagged instead of discovered by accident.
- An AP clerk capturing early-payment discounts: A stack of vendor invoices offers 2/10 Net 30. Enter each invoice date and amount, note the 10-day discount deadlines, and schedule payments to land inside the discount window — the 2% saved across a year's payables routinely beats the interest on the cash.
- A vendor offered EOM terms by a big customer: A buyer counters your Net 30 with Net 30 EOM. Run the same September invoice both ways — October 15 vs October 30 — and you can price the 15-day delay into your cash-flow forecast before accepting, instead of discovering it at month-end.
- Forecasting next month's cash in: Take every open invoice, compute its due date, and bucket the amounts by due week. The comparison table shows what happens if a customer negotiates from Net 30 to Net 45 or 60, so a terms negotiation becomes a cash-flow decision with numbers, not a gut call.
Invoice Due Date Calculator vs Alternatives
- A spreadsheet formula (=A2+30 or EOMONTH): Fast and free for one invoice, and the right tool if you live in Excel — =EOMONTH(A2,0)+30 handles EOM neatly. What it does not do is name the weekday, flag a weekend due date, compute a 2/10 discount deadline, or count days remaining; you build all of that yourself, per invoice.
- Your accounting software (Xero, QuickBooks, FreshBooks): The best answer if you already run one: due dates are automatic, tied to the invoice, and reminders go out on schedule. The tradeoff is that the answer lives inside a paid subscription — this page is for the invoice in front of you right now, the quote you are drafting, or the vendor bill you are checking without opening the books.
- Generic date calculators (days-between tools): They add days to a date correctly, but they know nothing about terms: no EOM start, no discount semantics, no weekend roll, no days-remaining status. Use one to check arithmetic; use this page when the question is 'when is this invoice due under these terms'.
- Our invoice generator and late fee calculator: The generator creates the invoice itself — line items, tax, discounts, printable output — and the late fee calculator prices the period after the due date. This page sits between them: it answers the deadline question both of those tools assume you already know.
Bottom line: if you run accounting software, its automatic due dates are the system of record. For a single invoice, a terms negotiation, or a discount decision — especially EOM and 2/10 terms, where a plain '+30 days' gives the wrong date — a dedicated due-date calculator is the fastest honest answer.
Frequently Asked Questions
How do you calculate an invoice due date?
Due date = invoice date + term days. A Net 30 invoice dated October 23, 2026 is due November 22, 2026 (October has 31 days, so 8 days carry you to October 31 and 22 more to November 22). A Net 45 invoice dated April 1, 2026 is due May 16, 2026. The tool does this addition with real calendar math, so month lengths and leap years are handled — February invoices included.
What does Net 30 mean, and do weekends count?
Net 30 means payment is due 30 days after the invoice date, and the days are calendar days: weekends and public holidays count. A Net 30 invoice issued on a Friday is regularly due on a Sunday about a month later. Whether that Sunday is enforced as-is or rolls to Monday depends on the contract — the tool's weekend-roll toggle shows both the raw date and the rolled date so you can see exactly what is at stake.
What is Net 30 EOM, and why is it so different?
EOM means 'end of month': the clock starts at the last day of the invoice month, not the invoice date. A September 15 invoice on Net 30 EOM is due October 30 (September 30 + 30 days), while the same invoice on straight Net 30 is due October 15 — a 15-day difference from one three-letter suffix. Early-month invoices gain the most from EOM terms, which is why vendors offer them and buyers should read them twice.
What does 2/10 Net 30 mean?
It means: take 2% off if you pay within 10 days; otherwise the full amount is due in 30 days. On an October 23, 2026 invoice, the discount deadline is November 2, 2026 and the full amount is due November 22, 2026. Skipping the discount is expensive: paying 2% extra for 20 extra days of credit annualizes to about 37% (2 ÷ 98 × 365 ÷ 20), so taking the discount beats almost any business loan — if cash flow allows it.
What happens if the due date falls on a weekend or holiday?
Strictly, the invoice is still due that day unless the contract says otherwise — many contracts roll weekend due dates to the next business day, and some roll holidays too. This tool rolls weekend dates when the toggle is on and says so explicitly; it does not model public holidays, which vary by country and state, so check a holiday calendar before enforcing a holiday-adjacent deadline.
Does the clock start on the invoice date or the delivery date?
On the invoice date, in the standard case — that is the date printed on the document. Two common exceptions change the answer: 'receipt of goods' terms start when the goods arrive, and EOM terms start at month-end. If the invoice went out a week after delivery, a week of waiting has silently been added; that is why the basis belongs in writing on the invoice itself, not in a handshake.
How are days remaining and days overdue counted?
Days remaining is the due date minus today, in calendar days: a November 22 due date checked on November 1 is 21 days away. Once the due date passes, the same subtraction goes negative and the tool reports days overdue instead. For what happens after the due date — late fees and interest — use our invoice late fee calculator, which prices the overdue period itself.