Repeat-client billing · manual review
Four-weekly versus monthly invoice calendar
Compare 28-day invoice dates with calendar-month anniversaries inside one entered horizon. See date drift before choosing recurring billing terms.
Try the invoice tool now ↗The existing invoice tool is separate. Start without signing in; free output has branding and usage limits. This review is not a new automatic billing, bank-sync or membership feature.
What decision does this help with?
Start both calendars on the same date. One adds exactly 28 calendar days each time. The other uses the original day number in each subsequent month, clamped to that month’s last day. The horizon includes its end date. This compares scheduling models, not an account’s repeating-invoice settings or a customer’s payment obligation.
Start with filled fictional records
Use internal codes instead of personal or bank details. Entries are reviewed locally in this page and are not uploaded, saved to an account or written into a draft. Keep a separate copy before leaving.
Fictional worked case · not customer evidence
Expected result and how to read it
From 31 January to 31 December 2026 inclusive, the 28-day model lists 12 dates and the monthly model lists 12 dates. Their counts happen to match, but the second dates are 28 February and 28 February, then the third dates are 28 March and 31 March. Four weeks is still not a calendar month. Different horizons can produce different counts.
Before using the result
- Choose a review date and source scope where requested. Preserve original invoices and agreements; a pasted row is not evidence by itself.
- Use one consistent currency, unit and amount basis. Correct a source conflict before copying a result to another record.
- Read every flagged or excluded record. A blank record is not assumed to be a verified zero. Editing inputs clears the prior result and disables its download.
- Download the review for your own working papers if useful. The CSV is a manual review file, not an invoice or an accounting-system import format.
At most 730 days. No weekend, public-holiday or time-zone adjustment. The original day is retained after short months; do not infer that every invoicing service follows this rule. Agree the actual schedule independently.
Prepare only verified new work
Resolve differences in your original records first. Open the existing invoice tool only when the next charge has been independently checked. Re-invoicing an already issued balance would duplicate the request for payment.
Try the invoice tool now ↗Questions before acting
Does a match prove payment, approval or a valid invoice?
No. The result compares only entered facts under the displayed method. Verify original records and any agreement before taking action. It creates no invoice, receipt, approval or new right to charge.
Can I use this for regular customer reviews?
At most 730 days. No weekend, public-holiday or time-zone adjustment. The original day is retained after short months; do not infer that every invoicing service follows this rule. Agree the actual schedule independently.
Source and independent method
The source below provides context for the workflow. The worked examples and comparison method on this page are independent manual aids, not a source-endorsed feature or a claim about another product’s current capabilities.
Reviewed 18 October 2026. A manual review file is not an invoice or a receipt.