> ## Documentation Index > Fetch the complete documentation index at: https://learn.nexudus.com/llms.txt > Use this file to discover all available pages before exploring further. # Invoice Dates and Due Dates > What the period, date and due date on an invoice mean, how invoice periods work, and how Nexudus decides when an invoice is due. ## Overview Every invoice has a **Date** and a **Due on** date. Invoices that include a contract also have a **Period**. | Date | What it is | | - | - | | **Period** | The time the invoice covers, for invoices that include a contract. It starts on the contract's billing day and runs for one billing cycle. | | **Date** | The date the invoice was issued. For invoices you create, and for purchases customers pay for in the Members Portal, it's the day it was created. For contract invoices, it's the day the contract is invoiced. | | **Due on** | The date the invoice becomes **Due**. If the customer pays automatically, by card or direct debit, payment is taken on this date. | You can change any of these dates on an individual invoice without changing the contract or the customer's settings. See [Edit an invoice](/platform/finance/invoices#edit-an-invoice). ## How invoice periods work In Nexudus, each day ends at midnight, so a period that ends on a date doesn't include that date. To cover a whole month, a period runs from a day of the month to the same day of the next month. For example, a monthly contract billed on the 1st has invoice periods of 1 June to 1 July, 1 July to 1 August, and so on. The customer is charged for 1 June to 30 June inclusive; 1 July is the start of the next period. To make this clearer, the dashboard shows the period's last day: a contract billed on the 7th shows periods such as 7 July to 6 August. The invoice the customer receives shows 7 July to 7 August, but they're charged for each day only once. The same applies to reports: to include everything up to and including 31 July, set the report's end date to 1 August. ## How the due date is set When an invoice is created, Nexudus sets its **Due on** date using the first of these rules that applies: 1. **The customer's due date**, if they have one. 2. **A plan due date**, if the invoice includes a plan that has one. If several apply, the earliest due date is used. 3. **Match billing period**, if it's turned on and the invoice includes a contract: the due date is the start of the contract's billing period. 4. **Your location's default due date**. If none of these is set, the invoice is due immediately. Each due date can be either: * **After invoice is issued**: **Immediately**, **After 3 days**, **After 7 days**, **After 14 days** or **After a number of days**, up to 365. * **On a calendar day**: the **1st**, **20th** or **last day of the following month**, or **a specific day of the following month**. Changing any due date setting only affects invoices created afterwards. To change the due date of an existing invoice, edit its **Due on** date. Due date settings in Payments and currency ### Default due date Go to **Settings → Billing and payments → Payments and currency → Auto-payments** and set the **Default due date**. New locations start with **After 3 days**. ### Match billing period On the same tab, turn on **If invoices include plans, make the due date match the contract billing period start date**. If an invoice includes several contracts, the billing period start closest to the invoice date is used. ### Plan due dates To give invoices for certain plans their own due date, select **Add plan due date** on the same tab. Choose the **Plans** and the **Due date**. ### Customer due dates To give one customer their own due date, open the customer and go to **Account → Contact and billing**. Set their **Due date**. It overrides every other due date setting. ## Give a customer more time to pay To give a customer longer to pay one invoice, open the invoice and change its **Due on** date. Do this before the invoice becomes due: automatic payments start on the due date. ## Payment reminders When a due invoice still hasn't been paid, Nexudus reminds the customer and your team. Set the **Number of days between payment reminder** in **Settings → Billing and payments → Payments and currency → Auto-payments**, under **Payments reminder**. You can turn these reminders off for individual customers in their account. To send a reminder yourself, use **Send Unpaid Invoice Notification** on the invoice. ## Related * [Invoices](/platform/finance/invoices) * [Contracts](/platform/finance/contracts): contract billing days and next invoice dates * [Invoice settings](/platform/finance/invoices/invoice-settings): matching the invoice date to the contract period This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.