Freelance Invoice Scheduler

How the Freelance Invoice Scheduler works

The Freelance Invoice Scheduler turns a recurring engagement into a concrete billing plan. Give it a start date, the number of invoices, the gap between them, and your net term, and it projects every issue date and every due date in one pass — so you can see when your money actually arrives across the whole engagement, not just for the next invoice.

Two intervals define the rhythm: how often you issue (30 days for a monthly retainer, 14 for a fortnightly one) and how long the client has to pay (Net 30, Net 15, Net 45). Both are counted in calendar days, matching how invoicing software and clients think about terms. The calendar still matters at the ends. An issue date that lands on a weekend or a public holiday on the calendar you select is sent on the next business day, and the net term runs from the day it is actually sent; a due date that lands on one moves to the next business day, which is the usual rule for a contractual payment date unless the contract says otherwise. Both are options, on by default, and every moved date is listed. The schedule stays anchored to the start date, so one moved invoice does not push the rest later.

Seeing all the due dates at once is the real value. Clusters and gaps in your cash flow become visible before they become problems, and you can stagger start dates to smooth income out instead of discovering a three-week famine in month four.

Worked example

A six-month retainer starting Wednesday 1 July 2026, issued every 30 days on Net 30 terms with the US calendar, produces invoice 1 issued July 1 / due July 31, invoice 2 issued July 31 / due Monday August 31 (day 30 is Sunday August 30), and invoice 3 issued Monday August 31 (its scheduled date, August 30, is a Sunday) / due September 30. Untick both options and you get the raw arithmetic instead: invoice 2 due August 30 and invoice 3 issued August 30, both Sundays.

Frequently asked questions

What this calculator does not do

A limitation you know about costs far less than one you find after the deadline. These are the specific things this tool cannot work out for you.

• Moving an issue date off a weekend or holiday is a scheduling choice, not a legal rule; some freelancers send early instead. The tool moves it to the next business day and keeps later invoices anchored to the start date.
• It schedules invoices and due dates on a fixed cycle. It does not track what has actually been paid.
• The number of invoices is capped deliberately — an unbounded schedule once generated thousands of rows and hung the browser.

Where these rules come from

The periods this calculator applies are taken from the primary sources below rather than from secondary summaries. Verify against them before relying on a date that matters.

• N.Y. General Construction Law § 25

  A contract payment due on a Saturday, Sunday or public holiday, or within a period ending on one, may be made on the next business day unless the contract indicates otherwise.

• California Civil Code § 11

  An act a contract requires on a holiday may be performed on the next business day.