Invoice Due Date Calculator
Calculate invoice payment deadlines using Net 7, Net 15, Net 30, Net 45, Net 60, Net 90, custom terms, or end-of-month rules.
Calculate Invoice Due Date
Choose a mode, enter the invoice date, and select your payment terms.
Calculation Mode
Select the date shown on the invoice.
Payment Terms
Use standard terms or calculate from the end of the invoice month.
Count Business Days Only
Count Monday through Friday and skip weekends.
Move Weekend Due Date
If the final date is Saturday or Sunday, move it to Monday.
Use today's date or another date for the overdue comparison.
Count Business Days
Exclude Saturdays and Sundays from the day difference.
Quick Example
An invoice dated January 1 with standard Net 30 terms generally has a calculated due date 30 calendar days later.
Your Result
Payment Summary
Invoice Due Date
Enter an invoice date and payment terms to calculate the due date.
Invoice Date
Payment Terms
Term Length
Due Weekday
Payment Timeline
ReadyCalculate to view the invoice payment timeline.
Calculation Rule
Due Date = Invoice Date + Payment Term Days
Important: Payment-term wording can vary by contract, country, supplier, customer, industry and invoice. This calculator does not automatically exclude public or bank holidays. Check the applicable agreement when determining a legally binding payment deadline.
How It Works
Calculate an Invoice Due Date in 3 Steps
Find a payment deadline without manually counting dates on a calendar.
Enter Invoice Date
Select the starting date shown on the invoice.
Choose Payment Terms
Select Net 7, Net 15, Net 30, Net 45, Net 60, Net 90 or custom.
View Due Date
See the calculated date, weekday, terms and timeline instantly.
Payment Terms
Common Invoice Payment Terms
Net 7
A short payment period commonly interpreted as payment due seven days after the applicable starting date.
Net 30
A payment term commonly used to indicate a deadline thirty days after the applicable starting date.
Net 60
A longer payment period that generally provides sixty days before payment is due.
Net 90
A longer credit period where payment is generally due ninety days after the applicable start date.
End of Month
Calculates the last calendar day of the month containing the invoice date.
Custom Terms
Enter your own number of payment days for supplier-specific or contract-specific terms.
Common Uses
Who Can Use This Calculator?
Freelancers
Calculate client payment deadlines from invoice terms.
Small Businesses
Track customer invoice due dates and payment schedules.
Accounts Teams
Estimate receivable and payable deadlines consistently.
Suppliers
Calculate deadlines for trade credit and customer invoices.
Invoice Payment Guide
What Is an Invoice Due Date Calculator?
An Invoice Due Date Calculator is a business tool that estimates a payment deadline from a starting date and a specified payment term. The starting date is often the invoice date, although contracts and commercial agreements may define a different starting point.
Instead of manually counting days on a calendar, you can select common terms such as Net 7, Net 15, Net 30, Net 45, Net 60 or Net 90. This calculator also supports custom term lengths and optional business-day counting.
How to Calculate an Invoice Due Date
For a basic calendar-day calculation, begin with the invoice date and add the number of days stated in the applicable payment terms.
Standard Due Date Formula
Invoice Due Date = Invoice Date + Payment Term Days
For example, if standard Net 30 terms apply, the calculator adds thirty days to the selected starting date. If weekend adjustment is enabled and the calculated date falls on Saturday or Sunday, the tool moves the result to the following Monday.
What Does Net 30 Mean?
Net 30 is commonly used to describe a payment period of thirty days. In a simple invoice-date calculation, thirty days are added to the invoice date to determine the estimated payment deadline.
The exact interpretation can depend on the contract or invoice wording. Some agreements may calculate from receipt of goods, receipt of invoice, approval, statement date or another defined event.
What Does Net 60 Mean?
Net 60 generally describes a sixty-day payment period from the applicable starting date. Longer payment terms can affect cash-flow timing for both the seller waiting for payment and the buyer managing outgoing payments.
Calendar Days vs Business Days
Calendar-day calculations count every day, including Saturdays and Sundays. Business-day calculations in this tool count Monday through Friday and skip weekends.
Public holidays and bank holidays are not automatically excluded because holiday calendars vary by country, region and year. If a contract uses business days, review whether applicable holidays must also be excluded.
What Are End-of-Month Payment Terms?
End-of-month rules use the final calendar day of the invoice month as part of the calculation. This calculator includes a direct end-of-month option and an end-of-month-plus-term option.
End of Month + Terms
Due Date = End of Invoice Month + Payment Term Days
How to Check Whether an Invoice Is Overdue
Compare the invoice due date with a comparison date. If the comparison date is later than the due date, the invoice is overdue by the number of days between those dates. If the comparison date is earlier, the invoice still has time remaining before the deadline.
Overdue Days Formula
Overdue Days = Comparison Date − Invoice Due Date
Why Invoice Due Dates Matter for Cash Flow
Payment timing can affect working capital and cash-flow planning. Businesses may use invoice deadlines to estimate when receivables could be collected and when supplier payments may need to be made.
A due date does not guarantee the actual payment date. Customers may pay early, on time or late. For forecasting, businesses may compare contractual due dates with actual historical collection behavior.
Common Invoice Due Date Mistakes
One common mistake is assuming that all payment terms begin on the invoice date. The applicable agreement may define a different trigger. Another mistake is treating calendar days and business days as interchangeable.
Businesses should also avoid assuming that weekends, public holidays and bank holidays are treated identically in every agreement. Contract wording and applicable rules should be checked when the exact deadline has legal or financial significance.
Important Note
This calculator provides date estimates and is not legal, accounting or contractual advice. Always review the invoice, purchase order, contract and applicable payment rules when determining an official deadline.
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Invoice Due Date Calculator FAQs
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