Invoice & Bill Due Date Calculator
Net 30, Net 45, Net 60, Net 90 Calculator
Calculate invoice due dates, Net payment terms (15/30/45/60/90), and vendor bill deadlines instantly for accounts payable management.
How it works
- 1
Enter the invoice date
Pick the issue date from the vendor bill or the invoice you sent.
- 2
Choose Net terms
Select Net 15, Net 30, Net 45, Net 60, Net 90, or type a custom day count.
- 3
Read the due date
See the exact calendar date, days remaining, and an overdue flag if the deadline has passed.
Sample output
A preview of the structured result Invoice Due Date Calculator produces — not a live extraction of your file.
Example Net 30 / Net 45 / Net 60 calculations from a 1 April 2026 invoice date.
| Terms | Invoice date | Due date | Days remaining (on 10 Apr) |
|---|---|---|---|
| Net 30 | 1 Apr 2026 | 1 May 2026 | 21 days |
| Net 45 | 1 Apr 2026 | 16 May 2026 | 36 days |
| Net 60 | 1 Apr 2026 | 31 May 2026 | 51 days |
Automate the Due Date, Not the Data Entry
Manual calculations drain your finance team. PerfectParser's AI instantly reads invoice due dates and Net terms from your PDF documents, allowing you to export clean payment records directly to your accounting system.
What is Invoice Due Date Calculator?
An Invoice and Bill Due Date Calculator helps Accounts Payable (AP) and finance teams stay on top of supplier obligations by calculating exact calendar deadlines from terms like Net 15, Net 30, Net 45, Net 60, or Net 90. PerfectParser handles complex leap-year and monthly calendar math, highlighting remaining days or overdue days to ensure your business maximizes early-payment discounts and avoids costly late fees.
Manual work vs. Invoice Due Date Calculator vs. PerfectParser
Counting days on a calendar
Easy to miss month lengths, weekends, and leap years when you do Net 30 math by hand.
This Net 30 calculator
Enter a date and terms. Get the due date and overdue status in one step — no login.
PerfectParser at scale
Extract invoice date and payment terms from PDF bills and calculate due dates across a vendor pack.
Why Use This Tool?
Instant Due Date Calculation
Enter any invoice date and pick your payment terms — due date, days remaining, and overdue status appear immediately.
Overdue Flagging
Invoices past their due date are automatically flagged with how many days they are overdue, so you can prioritise Account Payable (AP) follow-ups.
All Standard Terms Covered
Supports Net 15, Net 30, Net 45, Net 60, Net 90, and a custom day input for non-standard payment agreements.
Who Uses This Tool?
Account Payable (AP) Teams
Quickly calculate when vendor invoices are due to prioritise payments and avoid late fees.
Finance Controllers
Check overdue status across multiple invoices to manage cash flow and supplier relationships.
Freelancers
Know exactly when client payments are due — and how many days overdue they are — without using accounting software.
Frequently Asked Questions
Everything you need to know about the Invoice Due Date Calculator.
What is a Net 30 calculator?
A Net 30 calculator adds 30 calendar days to an invoice date so you know the exact payment deadline. Enter the invoice date, choose Net 30, and the tool returns the due date plus days remaining or days overdue. The same calculator also handles Net 15, Net 45, Net 60, and Net 90.
What does Net 30 mean on a vendor invoice?
Net 30 payment terms mean the total invoice amount is due 30 calendar days from the invoice date (including weekends and holidays). For example, if an invoice is dated April 1st, a Net 30 calculation makes the payment due on May 1st.
How do I calculate a Net 45 invoice due date?
To calculate a Net 45 due date, add exactly 45 calendar days to the invoice issue date. Our free Net terms calculator performs this date calculation instantly, accounting for varying month lengths and leap years so you don't have to count days manually on a calendar.
How do I calculate a Net 60 or Net 90 due date?
Add 60 or 90 calendar days to the invoice date. A 1 April invoice on Net 60 is due 31 May; the same invoice on Net 90 is due 30 June (watch month lengths and leap years). Select Net 60 or Net 90 in this calculator instead of counting days by hand.
What is the difference between an invoice due date and a bill due date?
While technically representing the same deadline, an 'invoice due date' is the term used by the seller tracking outgoing receivables, whereas a 'bill due date' is used by the buyer tracking accounts payable liabilities. This due date calculator serves both purposes, calculating payment deadlines for both billing records.
What are common payment terms like Net 15, Net 60, and Net 90?
Net terms indicate the number of days a buyer has to pay an outstanding bill. Net 15 requires payment in 15 days, Net 60 in 60 days, and Net 90 in 90 days. Businesses use these terms to manage vendor relationships, optimize working capital, and maintain predictable cash flow.
Can I extract due dates and payment terms from PDF bills automatically?
Yes. While this manual calculator is excellent for single bills, PerfectParser's AI extraction tools automatically parse PDF invoices, extract critical dates (invoice date, terms, and calculated due dates), and sync them directly with your accounting software to eliminate manual data entry.
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