Close-up of postal scale and labels at CPU counter

Contract Postal Unit Guide: Setup, Rules, and Compliance

August 19, 2026

A contract postal unit (CPU) is a supplier-owned or supplier-leased retail location, operated by non-postal employees under contract, that sells USPS products at official Postal Service prices. For a business or landlord deciding whether to pursue one, the bottom line is straightforward: a CPU can bring reliable foot traffic and a steady service fee, but only if you accept strict compliance obligations, staff training requirements, and a branded build-out that follows USPS Publication 156 to the letter.

Before you go further, know the core players you’ll deal with:

USPS Publication 156 — the governing rulebook for CPU contracts, design, and operations
Contract Access Retail System (CARS) — the equipment platform for performance-based CPUs
USPS Supplier eSourcing and Coupa Supplier Portal — the registration systems you’ll use to apply
USPS Office of Inspector General (OIG) — the watchdog whose audits shape how contracts are enforced

Key Takeaways

Success with a contract postal unit depends on treating compliance and build-out quality as inseparable from the revenue opportunity itself.

Point	Details
Know your contract type	Performance-based (CARS or non-CARS) and firm-fixed-price contracts pay differently, so confirm which applies before budgeting revenue.
Document local need early	A strong needs analysis with wait-time and population data speeds district review and contract approval.
Follow Attachment 5 precisely	Design and signage approvals from Publication 156 prevent costly late-stage rework during construction.
Centralize compliance records	One organized file for training certificates and quarterly reviews reduces audit exposure flagged by USPS OIG.
Partner early for build-out	Federal-rconstructionsolutions helps align construction timelines with federal compliance requirements before ground breaks.

What Is a Contract Postal Unit, Exactly?
When Does USPS Actually Authorize a CPU?
How Contract Postal Unit Agreements Are Structured
How to Apply to Become a CPU Supplier
What Compliance and Operations Actually Require
What Federal Audits Reveal About Common CPU Problems
Building or Converting a Site for CPU Use
Who Should Actually Pursue a Contract Postal Unit?
How Federal-rconstructionsolutions Supports Your CPU Build-Out
Sources
FAQ

What Is a Contract Postal Unit, Exactly?

A CPU provides most of what a customer expects from a Post Office counter: stamps, Priority Mail Express, package acceptance, shipping labels, and postal insurance. What it does not provide is a postal employee behind the counter. The site is owned or leased by the supplier, staffed entirely by the supplier’s own employees, and run as a retail concession under a signed USPS contract.

That distinction matters for scope. USPS employees cannot staff a CPU, and the supplier cannot sell competing delivery services, add surcharges on top of posted postage rates, or offer private mailbox services that mimic official post office boxes.

A CPU differs from two other access points you’ll hear about:

Post Offices are fully staffed by USPS employees and offer the complete range of services, including PO boxes and money orders in most cases.
Village Post Offices (VPOs) are limited-service outlets, often inside an existing local business, that stock stamps and flat-rate supplies but skip the full retail transaction set a CPU handles.
CPUs sit in between: full retail transaction capability, but under supplier ownership and contract terms rather than direct USPS control.

Performance-based CPUs typically qualify for CARS, the terminal system that weighs, meters, and calculates postage automatically. Eligibility depends on the specific contract configuration, and some CPU setups exclude PO box or money order functions entirely.

When Does USPS Actually Authorize a CPU?

USPS doesn’t hand out CPU contracts on request. The Postal Service opens a CPU when a documented need exists: insufficient retail hours at a nearby office, a growing community without adequate coverage, long wait times at an existing unit, or a discontinued post office that still needs some retail presence nearby.

The decision comes down to a needs analysis performed at the district level, weighing retail mapping data, projected transaction volume, and customer wait-time metrics against the cost of adding or expanding service. GAO’s review of CPU characteristics confirms these units exist specifically to fill gaps that don’t justify a full-service Post Office, while still reducing customer wait times where volume is real but limited.

A host office building the case for a new CPU typically documents:

Population growth or new development in the service area
Distance to the nearest full-service Post Office
Current wait times or capacity strain at existing units
Local business interest in hosting the contract

How Contract Postal Unit Agreements Are Structured

CPU contracts break down into a handful of models, and knowing which one applies determines how you get paid. Publication 156 lays out four main variants:

Performance-based percentage payment (CARS) — the supplier earns a percentage of postal sales, tracked automatically through the CARS terminal.
Performance-based percentage payment (non-CARS) — same revenue-share concept, but sales are tracked and reported manually.
Firm-fixed-price — the supplier receives a flat monthly fee regardless of transaction volume, common in lower-traffic or rural locations.
Seasonal or public service contracts — short-term or specialized arrangements tied to seasonal demand or a specific community service gap.

Payment flows through transaction-generated invoices, sometimes referred to by the abbreviation CPUT, which tally postal sales and calculate the supplier’s share or fee. All CPU solicitations go through competitive bidding at the district level, and contracts commonly require a surety bond depending on projected sales volume.

A few constraints apply across every contract type: no added surcharges on postage, no competing package-delivery services sold on-site, and no altering posted USPS pricing.

Quick glossary:

CARS — Contract Access Retail System, the automated postage terminal
CPUT — the transaction-based invoice generated from CPU sales activity
Host administrative office — the local USPS office that manages the contract day-to-day
CO/COR — Contracting Officer / Contracting Officer’s Representative, the USPS staff who approve and oversee the agreement

How to Apply to Become a CPU Supplier

Getting into the CPU program starts online, not with a phone call to your local post office. Here’s the sequence:

Register in USPS Supplier eSourcing, the portal where USPS posts solicitations and collects supplier qualifications.
Accept the invitation to join Coupa Supplier Portal (CSP) once USPS identifies your business as a potential fit; this is where ongoing contract and payment activity gets managed.
Complete the Supplier Information (SIM) form, providing business details, site information, and financial documentation.
Assemble supporting documentation, including proof of site control (ownership or lease), proposed hours, and a surety bond if the contract size requires one.
Reach out to [email protected] directly if you want to flag a specific community need or propose a location before a formal solicitation is posted.

The most common application mistakes are avoidable: showing up without a build-out concept, proposing vague or inconsistent operating hours, or failing to document why the local community actually needs the access point. A needs case backed by real data (population growth, drive-time gaps, existing wait times) moves faster through district review than a generic pitch.

What Compliance and Operations Actually Require

Winning the contract is the easy part. Keeping it requires sustained operational discipline. The host administrative office trains your staff initially and conducts quarterly performance reviews, so your team needs to treat that relationship as ongoing, not a one-time onboarding event.

Design and build-out follow Attachment 5 specifications inside Publication 156, covering signage, counter layout, and branding elements that make the site recognizably USPS-affiliated. Equipment expectations depend on contract type. CARS-eligible CPUs need the automated postage terminal, while non-CARS units rely on manual reporting tools.

Ongoing obligations include:

Maintaining posted operating hours without unapproved gaps
Keeping staff training certifications current and on file
Submitting accurate sales and transaction reports on schedule
Validating CPUT invoices before payment processing, not after
Preserving accessibility standards for customers with disabilities

Pro Tip: Build one master compliance folder, digital or physical, that holds training certificates, quarterly review notes, CPUT reports, and build-out approvals in one place. When an OIG audit request lands, retrieval speed is often the difference between a clean review and a flagged finding.

What Federal Audits Reveal About Common CPU Problems

OIG and GAO reviews of the CPU program point to the same recurring weaknesses. Incomplete quarterly performance reviews show up repeatedly, along with missing supplier training certification and program data errors on basic facts like operating hours or site addresses. One OIG audit found that automated invoice systems sometimes generated payments without proper certification, including instances where payments continued after a contract had already ended.

The consequences range from minor corrective action to outright contract termination. Broader OIG reporting on the program also documents a nearly 20% decline in active CPU and VPO locations in recent years, a trend tied partly to inconsistent oversight and underperforming sites.

Mitigation steps that actually work:

Run your own quarterly self-review before the host office does
Cross-check every CPUT invoice manually before certifying payment
Keep a single, centralized compliance file rather than scattered records
Build a direct line of communication with your COR so issues surface early, not during an audit

Building or Converting a Site for CPU Use

The construction side of a CPU project follows a fairly predictable sequence, whether you’re converting existing retail space or building new. Start with site selection: confirm the space meets accessibility standards, supports secure cash and mail handling, and fits customer flow patterns similar to a well-planned retail layout.

Confirm site eligibility — ownership or lease control, zoning, and adequate square footage for counter and back-office space.
Submit design plans for Attachment 5 approval, covering signage, branded fixtures, and counter configuration.
Order equipment, factoring in CARS eligibility if your contract is performance-based.
Schedule construction and inspections, working local building code compliance requirements into the timeline alongside USPS design sign-off.

Most build-outs run several weeks to a few months depending on the scope of renovation and how quickly design approvals move.

Pro Tip: Loop in the host office and your procurement team before finalizing signage or branding, not after. Late-stage design changes are the single most common source of schedule slippage on CPU projects.

Hands installing metal frame inside postal unit construction site

Pro Tip: Order long-lead equipment (counter terminals, security fixtures) as soon as your contract type is confirmed, rather than waiting for final construction sign-off.

Who Should Actually Pursue a Contract Postal Unit?

A CPU makes sense for retail operators with steady foot traffic who can treat postal transactions as a draw for their core business, not the main event. It makes far less sense for a cramped space with limited parking or a location that can’t support consistent staffed hours. If you’re weighing the opportunity, start with a real needs analysis, contact [email protected] early, and bring in a construction and procurement partner before you commit to a design.

How Federal-rconstructionsolutions Supports Your CPU Build-Out

A CPU build-out lives at the intersection of federal contract compliance and physical construction, which is exactly the gap Federal-rconstructionsolutions was built to close. Instead of juggling Attachment 5 design approvals, Davis-Bacon labor rules, and a construction schedule on your own, you get a partner who has already mapped how federal procurement requirements translate into real build-out decisions.

Federal-rconstructionsolutions

Federal-rconstructionsolutions helps construction firms and facility owners handle the pieces that typically slow a CPU project down: RFP and solicitation response support for public-service contract opportunities, FAR and Davis-Bacon compliance guidance for the construction work itself, and process improvement consulting that keeps your documentation audit-ready from day one. If your CPU project involves a public water system, municipal site, or other government-adjacent work, that same federal procurement expertise applies directly.

If you’re evaluating a CPU opportunity or already have a location in mind, the next step is a conversation about your specific site and contract type. Reach out through the federal procurement services page to scope out what your build-out and compliance timeline would actually look like.

Sources

FAQ

How much do USPS CPU contracts pay?

Payment depends on contract type: performance-based CPUs earn a percentage of postal sales through CARS or manual reporting, while firm-fixed-price contracts pay a flat monthly fee regardless of volume.

Can anyone get a USPS contract postal unit?

Any qualified business can apply through USPS Supplier eSourcing and the Coupa Supplier Portal, but award depends on demonstrated local need, site suitability, and competitive solicitation results.

How is a CPU different from a regular Post Office?

A CPU is owned or leased by a private supplier and staffed by non-postal employees, while a Post Office is fully staffed and operated directly by USPS with the complete range of services.

Who oversees CPU performance after the contract is signed?

The host administrative office manages training and conducts quarterly performance reviews, with district management and USPS OIG providing broader oversight and audit coverage.

Can Federal-rconstructionsolutions help with the CPU build-out process?

Yes. Federal-rconstructionsolutions supports construction firms and facility owners with FAR and Davis-Bacon compliance, RFP response support, and build-out planning aligned to Publication 156 requirements.