Definition
An installment payment is one of a series of scheduled payments that together settle a single invoice or purchase. Instead of paying the full amount by one due date, the client pays fixed portions on agreed dates. Installment plans make larger purchases affordable and help recover overdue balances without escalating to collections.
Also called: Payment plan, Installment plan, Instalment payment
Installment payment in practice
Put the schedule in writing: the total, the number of installments, each amount and due date, and what happens if a payment is missed. Some businesses charge a small fee or interest for spreading payments; check local consumer credit rules before doing so.
On the invoice, show the full amount, then list the schedule or reference the payment plan agreement. After each payment, send a receipt or updated statement showing the remaining balance due.
Installment payments differ from milestone payments. Milestones are tied to stages of work being completed; installments are tied to calendar dates regardless of progress.
Example
A dental lab agrees to let a clinic pay a $6,000 overdue invoice in four monthly installments of $1,500 on the first of each month, with the full balance due immediately if one is missed.
Frequently Asked Questions
Should I offer a payment plan to a late-paying client?
Often yes. A realistic plan the client can keep usually recovers more money, and more quickly, than collections. Get the plan signed and stop work on new orders until it is complete.
Do I issue a new invoice for each installment?
Either approach works. You can issue one invoice and track partial payments against it, or issue a separate invoice for each installment if the client's accounts team prefers.
Related terms
- Partial payment A partial payment is any payment that covers less than the full balance of an invoice.
- Balance due The balance due is the amount still owed on an invoice after subtracting any payments, deposits, or credits already applied.
- Milestone payment A milestone payment is a payment that becomes due when a defined stage of a project is completed, such as design approval, a prototype delivery, or launch.
- Collections Collections is the stage of pursuing an unpaid invoice after normal reminders have failed, through a formal demand letter, a collections agency, or legal action such as small claims court.
- Statement of account A statement of account is a summary document that lists all invoices, payments, and credits between a seller and one client over a period, ending with the current balance owed.
This page is for general information only and is not legal, tax, or financial advice. Rules change and vary by location, so consult a qualified lawyer or accountant about your situation.