In a very small business, purchasing decisions naturally stay visible — the owner sees every expense because they're the one making most of the purchases. That visibility quietly disappears as a business adds employees, department heads, and multiple people with a company card or the authority to commit to a vendor. Without a defined purchasing approval process, spending creep happens gradually and rarely gets noticed until the numbers show up in a monthly review that's already too late to do anything about it.
Start With Spending Thresholds, Not Blanket Rules
The goal isn't to require sign-off on every purchase — that just slows the business down and trains people to route around the policy. Instead, set tiered thresholds: purchases under a small amount (say $100-$250) can be made freely within a role's normal responsibilities, purchases in a middle range require a manager's approval, and larger purchases require owner or executive sign-off. The exact numbers should match your business's size and cash position, but the structure of tiered approval, not a single blanket rule, is what makes the process usable in practice.
Define Who Can Commit the Business to a Vendor
Separately from dollar thresholds, be explicit about who has authority to sign contracts, agree to recurring subscriptions, or commit the business to ongoing obligations, regardless of the per-transaction amount. A $40-a-month software subscription seems trivial, but a dozen of them signed up independently by different employees over a year adds up to real, often-forgotten recurring spend that nobody owns or reviews.
Require a Purchase Order or Written Approval Before Committing
The approval needs to happen before the commitment, not as an after-the-fact rubber stamp on an expense report. A simple purchase order process — even just a standard request form or approval email before ordering — creates a natural checkpoint and a paper trail, and it prevents the common pattern where someone makes a purchase first and asks forgiveness later because asking first felt slower.
Route Recurring and Subscription Spend Through One Owner
Software subscriptions and recurring vendor charges are where uncontrolled spending accumulates fastest, because each individual charge is small enough to go unnoticed on a statement. Assign one person — often in finance or operations — to own visibility into all recurring charges, review them periodically for tools that are no longer used or duplicated across departments, and require new recurring commitments to go through the same approval process as one-time purchases.
Give Department Heads a Budget, Not Just a Rule
Approval thresholds control individual transactions, but a budget gives each department or manager a total spending envelope to work within, with visibility into how much they've used and how much remains. This shifts the conversation from "is this specific purchase allowed" to "does this fit within what we planned to spend this quarter," which tends to produce better judgment than a pure approval-gate system on its own.
Make the Approval Process Fast Enough to Actually Follow
A purchasing process that takes a week to get a routine approval will get bypassed, especially by employees under time pressure. Set a clear expected turnaround for approvals — same day for routine requests is reasonable for most small businesses — and make sure whoever holds approval authority actually treats it as a priority rather than a low-priority task that sits for days. A slow process is often what kills an otherwise reasonable policy.
Review Spend Against Budget Regularly, Not Just at Year-End
A purchasing policy without a regular review is just a set of rules nobody checks. Build in a monthly review of actual spend by department or category against what was planned, so patterns and overruns get caught while they're still small and easy to correct, rather than surfacing as a surprise months later.
A purchasing approval process isn't about distrust of employees; it's about making sure spending decisions get made with the same visibility the owner had back when they approved every purchase personally. As a business grows past the point where one person can see everything, a defined process is what preserves that visibility instead of losing it.
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