Interior design mixes a few billing models on one project, a flat design fee, hourly design time, and furnishings billed at cost plus a markup, which makes a clear invoice more useful than it looks. A good interior design invoice separates your design fee from the product and procurement, credits the retainer, and gets you paid without a client questioning where the number came from. Here is what to put on an interior design invoice, a sample you can copy, and the payment terms that get designers paid faster.
What to include on an interior design invoice
An interior design invoice needs the standard fields plus several that fit design and procurement work.
Your details and the client's:: your studio name, the client's, and contact info.
A unique invoice number:: for both your records.
Invoice date and due date:: an exact due date, not just "net 30."
Project reference:: the project name or address and the phase this invoice covers.
Design fee:: the flat fee or design hours for concept, sourcing, and revisions.
Furnishings and procurement:: products billed at cost plus your markup, or your procurement fee, on its own line.
Project management:: any management or installation oversight fee, listed separately.
Retainer credit:: the retainer paid up front shown as a credit.
Subtotal, tax, and total:: the amounts and the balance due.
Payment terms and methods:: how and when to pay, plus any late fee.
Separating your design fee from the furnishings is what keeps an interior design invoice clear, since the client is paying for your expertise and for the product on two different bases.
Sample interior design invoice line items
Here is what realistic interior design line items look like, for a single-room project with procurement.
| Description | Qty | Rate | Amount |
|---|---|---|---|
| Design concept and space plan (living room) | 1 | $2,500 | $2,500 |
| Design hours (sourcing and revisions) | 12 hrs | $150 | $1,800 |
| Furnishings and procurement (cost plus 25%) | 1 | $3,750 | $3,750 |
| Project management and installation oversight | 1 | $1,200 | $1,200 |
| Retainer paid at signing | 1 | −$2,000 | −$2,000 |
Subtotal: $9,250 · Retainer applied: −$2,000 · Balance due: $7,250
Listing the design fee, the hours, and the furnishings markup separately shows the client exactly what they are paying for, and crediting the retainer makes the balance due clear.
Build your interior design invoice for free
You do not need to build this from scratch. Our free invoice generator lays out every field above, does the math, and downloads a professional PDF in minutes, with no signup. Add your design fee, hours, and furnishings and send.
The free tool is ideal for a one-off invoice. What it does not do is remember your clients or track which invoices and retainers are paid, which matters across a multi-phase project. FileCurrent saves your client details so invoices auto-fill, and it tells you which retainers and balances are paid and which are not.
Payment terms for interior designers
Design projects get paid more reliably when the money is split across the phases.
Take a retainer before you start, then bill by phase, concept, procurement, and installation, so you are never carrying weeks of design work or fronting furnishings without payment. Require furnishings to be paid before you place the order, since you should not be advancing product costs. Keep terms short and add a late fee. The interior design contract template covers the agreement your invoice bills against, and the freelance payment terms guide covers structuring the terms.
Frequently asked questions
What should an interior design invoice include?
Your details and the client's, a unique invoice number, the invoice and due dates, the project reference, your design fee or hours, furnishings billed at cost plus markup or a procurement fee, any project management fee, the retainer credited, the subtotal and balance due, and your payment terms. Separating the design fee from the furnishings keeps the invoice clear.
How do interior designers usually charge and invoice?
By a flat design fee, hourly, or a percentage, plus furnishings billed at cost plus a markup or through a procurement fee. Most take a retainer up front and bill by phase. The invoice separates the design fee from the product, so the client sees they are paying for expertise and for furnishings on two different bases.
Should interior designers mark up furnishings?
Commonly, yes. Many designers bill furnishings at cost plus a markup, often around 25 to 35 percent, or charge a separate procurement fee, which compensates you for sourcing, ordering, and managing the product. List it as its own line so the client sees the product cost and your markup are distinct from the design fee.
When should an interior designer collect payment?
Take a retainer at signing, then bill by phase as each is delivered, and require furnishings to be paid before you place the order. Splitting the payment across concept, procurement, and installation keeps you from carrying unpaid design work or fronting product costs, which is where designers most often get squeezed.
How do I make an interior design invoice?
List your details and the client's, add an invoice number, the dates, and the project reference, then itemize your design fee or hours, furnishings at cost plus markup, and any management fee, credit the retainer, and show the balance and terms. A free invoice generator handles the layout and math, and a dedicated tool tracks retainers and balances across your projects.
A clear interior design invoice separates your fee from the furnishings and gets you paid through every phase. FileCurrent saves your clients, tracks retainers and balances, and chases late payments automatically, so you are focused on the design instead of the paperwork. $15/month or $129/year. 7-day free trial, no card required.