3PL SLAs: The Service Levels to Get in Writing Before You Sign

Every 3PL says it's fast, accurate and responsive. The trouble starts when something goes wrong and the contract only says "industry standard."

Without written service levels, there's no shared yardstick. Your 3PL thinks two days to receive a container is fine. You expected same day. Nobody is wrong, because nobody wrote it down. Here's what a 3PL SLA should include, how to measure each part and what to ask before you sign.

What is a 3PL SLA?

A service level agreement is a list of measurable promises your 3PL makes about its work. It usually sits inside or alongside the main fulfillment agreement. The pricing side of the contract says what you pay. The SLA says what you get for it.

A good SLA does three things:

Defines each service level so both sides measure it the same way.

Sets a target, like 99% order accuracy or receiving within 48 hours.

Says what happens on a miss, from a written fix plan to fee credits or the right to leave.

For the pricing side, see our list of 3PL contract red flags.

Signs your 3PL has no real SLA

You hear about shipping mistakes from your customers, not from your 3PL.

Inventory sits on the dock for days, and nobody can tell you when it will be ready to sell.

Wrong items go out, but your 3PL says its accuracy is "great."

You email a question and wait days for an answer.

A pallet goes missing, and nobody can say who pays for it.

If two or more sound familiar, the fix starts with putting numbers in writing. If it's already gone too far, see when it's time to switch 3PLs.

What should a 3PL SLA include?

A 3PL SLA should cover seven service levels: receiving time, order cutoff and ship time, order accuracy, inventory accuracy, response time, damage and loss, and reporting and billing.

Receiving time

Receiving time, sometimes called dock to stock, is how long it takes from a truck or container arriving to the stock being counted, put away and available to sell. Slow receiving means stockouts on your store while your products sit on the dock. Ask what starts the clock (arrival or appointment time) and whether it changes for floor-loaded containers. See how warehouse receiving works.

Order cutoff and ship time

This says which orders ship the same day. A cutoff of "2 PM" means little without a time zone and a rule for what counts as received. Ask whether orders that come in after the cutoff ship the next business day, and whether the cutoff changes in peak season.

Order accuracy

Order accuracy is the share of orders shipped with the right items in the right quantities. Ask how an error is counted. Is it based on customer complaints, or on what the 3PL finds in its own checks? Complaints undercount errors, because many customers never say anything. See how pick and pack accuracy is checked.

Inventory accuracy

Inventory accuracy is how closely the counts in the 3PL's system match what is on the shelf. Ask how often they count (full counts, cycle counts or both) and whether you can see live stock in a portal. If you can't see your own inventory without asking, read about inventory visibility.

Response time

How fast do you get an answer when an order is missing or a retailer is waiting? Put a number on it, separate urgent issues from everyday questions, and ask who you'll actually talk to. See what good 3PL customer service looks like.

Damage and loss

When stock is damaged or lost inside the warehouse, the contract should say who pays and how much. Ask whether the 3PL reimburses at your cost, at a fixed amount per unit or not at all, and what proof is needed. Damage in transit with a carrier is a separate question, so ask who files carrier claims.

Reporting and billing

You should be able to see inventory, orders and shipments without emailing anyone, and every invoice should list each charge. Ask for a sample invoice before you sign, and learn how to audit your 3PL invoice.

How should 3PL service levels be measured?

Each service level needs a written definition, or the target means nothing. For every one, agree on:

When the clock starts. Arrival at the dock, the delivery appointment or the moment an order reaches the warehouse system.

What counts as a miss. For accuracy, is a wrong color an error? Is a missing insert?

What's excluded. Carrier delays, inventory that arrives without labels, orders with bad addresses and your own system outages are usually excluded. Get the list in writing.

Where you see the numbers. Monthly reports are the minimum. A live dashboard is better. See KPI reporting in fulfillment.

What happens when a 3PL misses an SLA?

It depends on the remedy written into the contract. Most SLAs use one or more of these:

A written fix plan: the 3PL explains what went wrong and what will change, with a date.

Fee credits: a credit on the next invoice when a service level is missed.

The right to leave: if service levels are missed repeatedly, you can end the contract without a penalty.

The right to leave matters most. Credits rarely cover the cost of a bad month, but an exit clause gives the SLA real weight. If you're already living with missed service, see how to switch 3PL providers.

What does a brand owe its 3PL under an SLA?

Service levels work both ways. A 3PL can only hit its numbers if you send what it needs on time:

Send advance notice of inbound shipments, with SKUs and quantities, before they arrive.

Label your products the way the warehouse expects.

Share forecasts, especially before peak season and big promotions. See whether your 3PL will survive peak.

Keep product data current, including weights, dimensions and any special handling.

Expect a good 3PL to ask for these. If it doesn't, it probably isn't measuring much either.

What should you ask a 3PL about service levels?

What service levels will you put in writing, and how do you measure each one?

What's your receiving time, and what starts the clock?

What's your order cutoff, and in what time zone?

How do you count an order error?

How often do you count inventory, and can I see live stock?

How fast do you respond to urgent problems?

Who pays if my inventory is damaged or lost in your warehouse?

What happens if you miss a service level?

Do your service levels change during peak season?

For more questions to ask before you sign, see 10 questions to ask a 3PL.

How does 3PL Center handle service levels?

Our standards are numbers you can check. Inventory is received and ready to ship within 24 to 48 hours of arriving. Orders received by 2 PM ship the same day, and we hold 99% order accuracy.

You see your stock, orders and shipping in our online portal, and every charge is listed in our warehouse system, so there are no hidden fees. Every account has a named account manager, and our team handles carrier claims for damaged or lost shipments for you.

We ship from our main warehouses in New Jersey and California. See what our 3PL technology shows you, or book a call and ask us anything on the list above.