How do interior design firms handle expense management?

Key takeaways

• Vergo proposes the coding by inference from your own accounting structure and history, including project and phase assignments — no rule library to build, no keyword lists to maintain, and new vendors are coded on first sight.
• Interior design firms track expenses at the project level, coding every purchase to a specific client engagement, phase of work, and cost category.
• Accurate expense categorization distinguishes reimbursable costs, product markups, and overhead to prevent unbilled cost leakage and maintain project profitability.
• Real-time coding at the point of purchase — rather than month-end cleanup — ensures controllers have current visibility into project margins and unbilled costs.
• Purchase order reconciliation and phase-based budget tracking are critical for firms managing multiple projects with mixed fee structures.

What expense management looks like for interior design firms

Expense management in interior design is fundamentally a project-based accounting discipline. Every dollar spent — from fabric samples and finish allowances to subcontractor labor and freight — must be traced back to a specific client engagement and phase of work. Interior design projects typically move through distinct phases: programming, schematic design, design development, procurement, and installation. Expenses incurred in each phase carry different billing implications. A material deposit paid during procurement may be a client passthrough; a drafting tool purchased during design development may be a firm overhead cost. Many interior design firms also operate on mixed fee structures: flat design fees, hourly billing, and product markups often coexist on the same project, requiring expense management systems that support multiple cost recovery models simultaneously.

Why real-time project-level coding matters

For a controller at an interior design firm, the core challenge is ensuring that project-level profitability is visible and accurate in real time. When expenses aren't coded to the right client and phase immediately, cost reports lag behind reality and project managers make decisions based on incomplete data. Unbilled cost leakage is a primary concern: reimbursable expenses like shipping, receiving fees, and installation labor that aren't captured and billed on schedule shrink project margins with no visible audit trail. Markup errors compound the problem — interior design firms frequently apply a markup of 15–35% to product costs before billing clients, but without proper vendor invoice matching to purchase orders and client proposals, markups are applied inconsistently or missed entirely. Budget overruns on projects surface only at invoice time when coding happens at month-end, leaving no opportunity to course-correct during execution.

Tax treatment and procurement reconciliation

Interior design firms face additional complexity in tax classification and purchase order management. Purchases for resale to clients may carry different sales tax treatment than items consumed internally as firm overhead. Misclassification creates audit exposure and complicates state tax filings. Purchase orders issued to vendors must reconcile against what was received and what was invoiced — a process critical for large FF&E packages that ship in multiple deliveries. Vergo handles card spend, employee reimbursements, and AP invoices through one coding model with purchase order matching and project-level tracking built in. Firms managing multiple concurrent projects often carry aging PO balances that distort both expense reports and accounts payable. Each partial delivery requires matching the vendor invoice to the correct PO line, confirming receipt, and releasing only matched amounts for payment. This prevents overpayment and maintains accurate cost-to-complete projections, which are essential for project financial forecasting and client billing accuracy.

A practical example

A residential design firm completes a full-home project spanning 14 months. When expense receipts are collected from designers via email and coded at month-end by a bookkeeper based on best-guess memory, $8,400 in reimbursable freight and receiving charges is absorbed as overhead because no one flagged the expenses as billable at the time of purchase. The project closes at a 12% margin instead of the projected 22%. With structured, real-time coding, the same firm codes every vendor invoice, credit card charge, and out-of-pocket receipt to a client project and cost category — FF&E, labor, reimbursable, or overhead — before it enters the accounting system. The controller runs a weekly unbilled-cost report and issues client invoices for reimbursables on a rolling basis, bringing project margin visibility current within 48 hours of any spend event.

Procurement-specific workflows

A commercial interior design firm issues a purchase order to a furniture vendor for a $62,000 FF&E package on a corporate headquarters project. The vendor ships in three partial deliveries over six weeks, and each delivery generates a receiving report and a partial vendor invoice. Expense management in this scenario requires matching each invoice to the correct PO line, confirming receipt, and releasing only matched amounts for payment. This three-way matching process prevents overpayment, ensures that project cost reports reflect only verified receipts, and maintains accurate cost-to-complete projections that inform both internal project tracking and client billing schedules. Without this discipline, the firm risks paying for goods not yet received or recording costs against the wrong project phase, distorting profitability analysis.

How Vergo handles this

Vergo is an AI-native, card-agnostic expense management platform that handles card spend, employee reimbursements, and AP invoices through one coding model. Vergo proposes the coding by inference from your own accounting structure and history, including project and phase assignments — no rule library to build, no keyword lists to maintain, and new vendors are coded on first sight. Every coding shows why it was chosen, so a reviewer confirms in seconds instead of re-coding by hand. Approval workflows are optional and fit how you already control spend: route by GL account, by amount, or by project — or skip approval flows entirely and let policy flags catch only what breaks a rule. Transactions are ready to code the moment they happen, with no waiting for clearing, and once they clear, they sync into your accounting or ERP software. Employees handle everything by text message — no app to download, no portal login — and Vergo chases missing receipts itself. Connecting your existing cards involves no card applications, no re-issuing, and no banking change. Vergo integrates with every ERP and accounting software.

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