Invoice Simple gives you the ability to schedule payments with your clients. You can schedule multiple payments with multiple due dates which will be viewable on your invoices.
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​How to add a Scheduled Payment
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Start by creating an invoice and going to the edit screen. Hit the Schedule a Payment option just below the balance due

Here, you'll see your payment options. Hit Add upcoming payment under the Upcoming Payments header

Set the Type as Percent or Flat amount. You'll then have the option to set an amount and a due date.

You'll now see your Scheduled Payment in the Upcoming Payments window.

The Scheduled Payment will now also show on the client invoice with the due date