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Invoice Due Date Calculator

Find when an invoice is due from the invoice date and payment terms. Choose net days or due on receipt, then optionally move a weekend due date to the next or previous business day.

If due date falls on a weekend, shift to the working day

Due date

Example

August 31, 2025

2025-08-31 · UTC

Based on

Invoice date
2025-08-01
Payment terms
Net 30
If weekend
Keep calendar date

Weekend adjustment uses UTC weekdays only (not holiday calendars).

More detail

Weekend
Due date falls on a weekend

Next step: Net 30 Calculator

When to use this calculator

Use this calculator whenever you know an invoice date and payment term and need the exact due date—for accounts-receivable follow-up, accounts-payable scheduling, or checking a vendor's stated terms against your own math.

  • Accounts receivable follow-up

    Find when a customer's invoice is due so you know when to start aging or send a payment reminder.

  • Accounts payable scheduling

    Confirm when a vendor invoice must be paid to avoid late fees or missed early-payment discounts.

  • Custom or uncommon terms

    Use a custom day count for terms outside the standard Net 15/30/45/60 presets, such as Net 21 or Net 75.

  • Net-term shortcuts

    For a fixed, commonly used term, the Net 15, Net 30, Net 45, or Net 60 calculators skip the term dropdown entirely.

Inputs

  • Invoice date

    The date the invoice was issued—the day payment terms usually count from, unless your agreement states a different start date.

  • Payment term

    A preset (Due on receipt, Net 7, Net 10, Net 15, Net 30, Net 45, Net 60, Net 90) or a custom number of days.

  • Weekend handling

    None (keep the raw calendar due date), shift to the next business day, or shift to the previous business day, applied only when the due date falls on a Saturday or Sunday.

How the calculation works

Due dates use calendar days on the UTC calendar: the invoice date plus the number of days in your payment term (for example, Net 30 adds 30 calendar days).

Due on receipt means zero calendar days—the due date is the same day as the invoice date.

Weekend handling is optional and applies only to the resulting due date, not to the day count itself. When the calendar due date falls on a Saturday or Sunday, you can leave it unchanged, move it to the next business day (Monday), or the previous business day (Friday). Adjustments follow UTC weekdays only and do not apply US holiday lists.

Worked example

Invoice date: Monday 3 March 2025. Payment term: Net 30. Weekend handling: none.

Due date: 3 March + 30 calendar days = Wednesday 2 April 2025.

If the same invoice used Net 45 instead, the due date would be 30 calendar days later still: Thursday 17 April 2025.

Weekend example: an invoice dated so its Net 30 due date lands on Saturday—with 'next business day' selected, the adjusted due date moves to the following Monday; with 'previous business day', it moves to the preceding Friday.

Edge cases

  • Custom day counts

    Any non-negative whole number of days is accepted as a custom term, not just the preset values—useful for negotiated terms like Net 21 or Net 75.

  • Due on receipt with weekend handling enabled

    If the invoice date itself falls on a weekend and weekend handling is on, the due date (equal to the invoice date) is adjusted the same way any other due date would be.

  • Holidays are not excluded

    Weekend adjustment only checks Saturday and Sunday. A due date that lands on a weekday public holiday is not moved by this calculator.

  • Business-day terms, not calendar-day terms

    If a contract states the term in business days rather than calendar days—uncommon but not unheard of—use the Add Business Days To Date Calculator instead, since this calculator only adds calendar days.

Related Finance & Billing Calculators

The Net Payment Terms Guide is the primary reference for what Net 10, Net 15, Net 30, Net 45, Net 60, and Net 90 mean, and how calendar vs business days affect an invoice due date.

The Invoice Due Date Guide explains how invoice due dates are calculated step by step, including weekend handling and common mistakes with start dates.

The Invoice Due Date Calculator finds a due date from any invoice date and payment term—Net 7, Net 10, due on receipt, or a custom day count—with optional weekend adjustment.

The Net 15 Calculator, Net 30 Calculator, Net 45 Calculator, and Net 60 Calculator are fixed-term shortcuts for the same due-date math, for the most commonly searched payment terms.

The How Prorated Rent Is Calculated guide and Prorated Rent Calculator cover partial-month rent for a move-in or move-out date that falls mid-billing-period, using the same daily-rate proration logic as prorated salary.

For accounts-payable timing that depends on business days rather than calendar days, see the Business Days Calculator and Add Business Days To Date Calculator in Date & Business Days.

For contract terms tied to invoicing or billing—renewal windows and end dates—see the Contract End Date Calculator in Contracts & Legal.

FAQ

Are Net terms business days or calendar days?
This calculator uses calendar days, which is how most vendor invoices phrase Net 7, Net 30, and similar terms. If your contract specifies business days only, use the Add Business Days To Date Calculator and your contract's rules instead.
What does due on receipt mean?
Payment is due immediately on the invoice date—zero calendar days are added.
What if I only need one specific term, like Net 30?
The Net 15, Net 30, Net 45, and Net 60 calculators use the same math fixed to that term, without needing to select it from a dropdown each time.
Does this calculator apply a holiday calendar?
No. Weekend handling only checks Saturday and Sunday. It does not exclude public holidays from the calendar due date.
Is this tax or legal advice?
No. Payment terms vary by contract and jurisdiction. Use this for planning and confirm amounts and dates on your invoice or with your accountant.

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