A 3PL asks for money upfront for two reasons: it buys your shipping labels before your orders leave the building, and it starts paying for labor and space the day your stock arrives. The deposit or prepaid balance covers that gap. How it's structured decides how much of your cash sits with the warehouse, and whether you get it back.
A 3PL asks for a deposit or prepayment because carriers like USPS require postage to be paid before a package ships, and the warehouse carries labor and storage costs before it bills you. The four common models are a security deposit held until you leave, a prepaid balance drawn down by each charge, a postage float for labels only, and billing in arrears on net terms.
Why 3PLs ask for money before they ship
Postage is the biggest reason. The USPS Domestic Mail Manual says postage on all mail must be fully prepaid at the time of mailing (DMM 604, section 6.1), and in January 2024 USPS told shippers that packages without valid proof of payment before entry may be treated as abandoned. A 3PL printing labels on its own USPS account pays for every label before your customer's order moves. USPS business accounts are funded either by ACH debit from a bank account or by prefunding a trust account, according to the USPS Enterprise Payment System FAQs (March 2026).
Postage is also a large share of the bill. In the 4,000-order example below, labels cost more than twice the warehouse fees, so a 3PL that bills monthly in arrears is lending you several weeks of postage. That's a reasonable ask from a client with a payment history, and a lot to ask from a brand the warehouse met last week.
The second reason is the work done before the first invoice. Receiving, building your SKUs and bundles, and storing stock all happen before a single order ships. A deposit covers the risk that a brand sends inventory and stops paying. Warehouses also have a legal backstop: under UCC 7-209, a warehouse has a lien on the goods it holds for storage, labor and related charges. A deposit means the 3PL rarely needs to use that lien, which is better for both sides. The contract negotiation guide covers how to limit lien language.
The four ways 3PLs take money upfront
Each model answers a different question: how much cash sits with the warehouse, when it's spent, and when it comes back.
| Model | What you pay | What it's applied to | When it comes back |
|---|---|---|---|
| Security deposit | A fixed amount before go-live | Held against unpaid invoices; not spent on daily charges | At exit, after the final invoice, if the contract says it's refundable |
| Prepaid balance | An opening balance, then top-ups | Every charge draws it down as it happens | Whatever's left at exit, if the contract allows a refund |
| Postage float | A balance for labels only | Postage as labels print; warehouse fees billed separately | Unused postage at exit, depending on terms |
| Billing in arrears with net terms | Nothing upfront for fees | You pay each invoice 7, 15 or 30 days after it's issued | Not applicable |
Some 3PLs combine two of these, such as a deposit at signing plus a prepaid balance or postage float for daily spend. Custom packaging can have its own terms too: 247 Fulfillment's billing guide notes that a 3PL may ask for a deposit on boxes printed for your brand even when everything else is billed after the work.
How a prepaid balance draws down over a month
A prepaid balance drops each time a label prints and each time warehouse fees post, and it tops back up from your bank account when it falls below a set threshold. The example below shows a month at 4,000 orders. Every figure except postage is an example, not Orderfy's rates.
Example assumptions:
- 4,000 orders a month: 200 orders a day, 5 days a week, 4 weeks.
- Postage of $7.86 per order, the USPS Ground Advantage commercial price for a parcel up to 15.999 ounces to zone 5 in USPS Notice 123 (effective October 4, 2026). Your 3PL's contract rate may be lower, and heavier or farther parcels cost more.
- Warehouse fees of $3.00 per order (example only), posted once a week.
- Opening balance of $10,000 (example only). When the balance drops below $3,000, it tops up by $10,000 from your saved bank account.
| Week | Starting balance | Postage drawn | Weekly fees | Top-ups | Ending balance |
|---|---|---|---|---|---|
| Week 1 | $10,000 | $7,860 | $3,000 | 1 x $10,000 | $9,140 |
| Week 2 | $9,140 | $7,860 | $3,000 | 1 x $10,000 | $8,280 |
| Week 3 | $8,280 | $7,860 | $3,000 | 1 x $10,000 | $7,420 |
| Week 4 | $7,420 | $7,860 | $3,000 | 1 x $10,000 | $6,560 |
| Month | $10,000 opening | $31,440 | $12,000 | $40,000 | $6,560 |
You spent $43,440 on fulfillment and postage and paid in $50,000, so $6,560 still sits with the 3PL at month end. That leftover is the cost of the prepaid model: roughly half a week of spend that's yours but not in your bank. Under net 15 terms, the same $43,440 lands as one invoice after month end and is due about two weeks later, so you keep the cash for up to six weeks but carry one large bill.
The top-up amount changes how often you're charged, not how much you spend. A $5,000 top-up in the same month would trigger about eight charges instead of four. If you'd rather reconcile once a week, ask for a top-up sized to one week of spend.
How big a postage float or opening balance should be
A sensible opening balance covers about one week of postage, because that's how long a 3PL waits between a label printing and the next billing cycle under weekly billing. At the same $7.86 example price:
| Orders a month | Orders a week | One week of postage |
|---|---|---|
| 1,000 | 250 | $1,965 |
| 3,000 | 750 | $5,895 |
| 5,000 | 1,250 | $9,825 |
| 10,000 | 2,500 | $19,650 |
If a 3PL asks for far more than a week or two of postage and fees as a prepaid balance, ask what the extra covers. If it's a security deposit, the size reflects the 3PL's risk on unpaid bills, and it should be stated as a fixed amount with a refund rule.
What to check before you pay a deposit or prepayment
A Shopify oral care brand moving to us asked three questions before its Q4 inbound of about 5,000 units: how pricing is structured, how returns are handled and how prepayment works. The third question breaks down into five checks, and each one has a clear good answer.
- Is it refundable? A good answer names the condition: refunded within a set number of days after the final invoice is paid, or applied to the final invoice.
- What is it applied to? A security deposit isn't spent on daily charges. A prepaid balance is. If the 3PL calls it a deposit but draws it down, it's a prepaid balance with a new name.
- When is it topped up, and by how much? You want the threshold and top-up amount as numbers, plus the payment method and any fee for paying by card.
- What happens when the balance runs out? Some 3PLs hold shipping until it's funded. Find out how much notice you get and whether orders stop or just queue.
- What happens on exit? Get the timeline for returning any unused balance or deposit, and whether the 3PL can hold it, or your stock, against a disputed invoice.
Also ask how you'll see each draw. A prepaid balance is only as clear as the ledger behind it: you should be able to match every deduction to an order, a receiving job or a storage period. The sample 3PL quote and the 3PL invoice at 10,000 orders show how those lines should read.
When the deposit gets paid during onboarding
The deposit is usually due before the first inbound, so it belongs on the onboarding timeline, not after go-live. At Orderfy, the client's first user sets a password from an invite email and then completes business details, returns, store, payment and team steps in Orderfy WMS. Clients sign the services agreement inside Orderfy WMS by typing their name and title, and inbound shipments stay blocked until the agreement is signed and the opening deposit is paid. Book your first truck after both are done. The onboarding checklist lists the rest of what a warehouse needs before stock arrives.
How we bill prepaid accounts
We bill weekly with autopay, and each charge shows in Orderfy WMS, our proprietary WMS built in-house, on the order it belongs to. Prepaid clients top up automatically from a saved bank account when the balance runs low, so shipping doesn't wait on a manual payment. You can trace any charge on the weekly invoice back to the order that caused it.
Frequently asked questions
Not always. Some 3PLs bill in arrears with no deposit, and others ask for a security deposit, an opening prepaid balance or a postage float before your first inbound. The model depends on the 3PL's billing setup and your payment history.
It's a balance you fund upfront that each label and warehouse charge draws down. When it falls below a set threshold, it tops up from your saved payment method. You spend the same amount as on net terms, but you pay before the work instead of after.
It depends on the contract. A security deposit is commonly returned or applied to the final invoice at exit, but the contract has to say so. Check the refund timeline and whether the 3PL can hold it against a disputed charge before you pay.
Net 30 keeps cash in your account longer, but it concentrates a month of postage and fees into one payment. Weekly billing or a prepaid balance means smaller, more frequent charges that are easier to check against your orders. Pick the model that matches how often you want to reconcile.
Get an itemized quote
Request a quote with your monthly orders, SKU count and package weights, and we'll show how postage and prepayment are billed before you sign.
Sources
- USPS Domestic Mail Manual 604: Postage Payment Methods and Refunds (section 6.1, postage fully prepaid at mailing), checked November 5, 2026
- USPS industry alert: Payment Required Prior to Shipment of Domestic Mail Packages (January 18, 2024), checked November 5, 2026
- USPS Enterprise Payment System FAQs (March 2026, ACH debit and prefunded trust accounts), checked November 5, 2026
- USPS Notice 123 Price List (USPS Ground Advantage commercial prices effective October 4, 2026), checked November 5, 2026
- UCC 7-209: Lien of warehouse, Cornell Legal Information Institute, checked November 5, 2026
- 247 Fulfillment: How to Compare 3PL Billing Cycles, Payment Terms and Deposits (October 9, 2026; packaging deposits, shipping holds), checked November 5, 2026