Should You Buy Your Own Modem and Router? How to Do the Math

Look closely at your internet bill and you may find a line for “equipment,” “gateway” or “Wi-Fi.” That fee is the rent you pay on the box blinking in your living room. Paid every month for years, it can add up to more than the hardware is worth.

But buying your own gear isn’t automatically the cheaper move. Some providers now include equipment in the plan price, some bundle extras with their rented gateway, and some fiber services require their own box no matter what. The only way to know is to do the math for your bill and your provider.

This guide shows you how to calculate rental fees against purchase, check compatibility and decide whether to own the modem, the router or both.

Modem, router or gateway: what you’re actually renting

Before you compare costs, figure out which box you have.

• Modem: Translates the signal coming into your home (over cable, phone line or fiber) into an internet connection. Cable modems follow a standard called DOCSIS; DOCSIS 3.1 is the current mainstream version and supports gigabit-class plans.
• Router: Takes that one connection and shares it with all your devices over Wi-Fi and Ethernet. It also runs your home firewall.
• Gateway: A modem and router combined in one box. Most cable companies rent gateways today.
• ONT (optical network terminal): On fiber service, this box converts light to an Ethernet signal. It is usually provider-owned and not something you replace.

If you rent a gateway, you may be able to replace it with your own modem plus your own router, or with your own all-in-one gateway. If you have fiber, you’re usually looking only at the router side.

Step 1: Find the real monthly equipment cost

Start with the actual number you pay. 3 places to look:

1. Your bill. Look for line items such as “equipment,” “gateway rental,” “modem lease” or a Wi-Fi add-on.
2. Your broadband label. Under FCC rules, internet providers must show a standardized broadband label at the point of sale. Larger providers had to do so by April 10, 2024, and smaller providers (under 100,000 subscribers) by October 10, 2024. The label lists monthly fees, including modem or equipment rental, separately from the base plan price.
3. Your provider’s plan page. Some providers now include equipment at no extra cost. Xfinity, for example, states that its current plans include the Xfinity Gateway at no extra cost, and Spectrum says all its internet plans include a modem at no extra cost. Spectrum lists its Advanced WiFi router service at $10 a month, or included with its 1 Gig plan or a bundle. Prices and inclusions change, so check the current terms for your plan.

If your equipment fee is $0, buying your own gear won’t lower your bill. The reasons to buy then are performance, features or privacy, not savings.

Step 2: Calculate your break-even point

The formula is simple:

Break-even months = purchase price ÷ monthly rental fee

Here’s an example with made-up round numbers to show the method. Use your own figures.

Then compare the break-even to how long you’ll keep the setup:

• Staying put for 2+ years with the same provider? Buying usually wins if you pay a fee.
• Moving soon or likely to switch providers? A cable modem may not work with a fiber or 5G provider, so your savings can vanish.
• Plan to upgrade speed tiers? Make sure the modem supports faster tiers, or you’ll be buying again.

Add 2 hidden costs to the math. First, your time: you’ll set up and update the equipment yourself. Second, lifespan: Wi-Fi standards move on, and a router bought today may feel dated in several years. Our explainer on Wi-Fi 7 covers how often that happens.

Key takeaway: Find your real equipment fee on your bill or broadband label first. If it’s $0, buying won’t save money; if it’s a monthly charge, divide the purchase price by that fee and buy only if you’ll keep the service longer than the break-even.

Step 3: Check provider compatibility before you buy

This is the step that saves you a return trip. A modem that isn’t approved by your provider may not activate at all.

• Cable (Xfinity, Spectrum, Cox and others): Providers publish lists of approved or compliant modems. Xfinity says your modem “must work with Xfinity and support your internet speed,” and points customers to its My Device Info tool to check a model. Spectrum maintains a list of compliant modems for its network.
• Speed tier: Gigabit and multi-gig plans need a modem rated for them, typically DOCSIS 3.1 or newer.
• Phone service: If you get home phone service through your cable provider, you may need a specific voice-capable modem. Many standard retail modems don’t support provider phone service.
• Fiber: You usually keep the provider’s ONT. Some fiber providers let you plug any standard router into it; Xfinity notes that in fiber-served communities you can use any standard router that supports your speed tier. Others require their own gateway for authentication, in which case you can place your own router behind it using a passthrough or bridge setting, if the provider supports one.
• 5G home internet and DSL: These usually require the provider’s device. Check before you buy anything.

Write down the exact model number from the approved list, and buy that model. A similar name with a different suffix can be a different device.

What you gain and give up by owning

The support trade-off is real. Xfinity’s own compatibility page says customers who bring their own device are responsible for updates, security, troubleshooting and Wi-Fi setup. When your internet goes down, a provider agent can see and reset a rented gateway remotely; with your own modem, you may hear “please connect our equipment and try again.”

Also check whether your provider ties extras to rented gear. Some plans bundle features such as whole-home Wi-Fi extenders, security tools or data allowances with their equipment. Read your plan terms before you return anything.

Should you buy the router even if you keep the modem?

Often, yes. The router is where most people feel the difference. A rented gateway’s built-in Wi-Fi may be fine for an apartment, but a larger home with dead zones may do better with a mesh system. Many people keep the provider’s modem or gateway, switch the gateway into bridge mode (if supported) and add their own router or mesh kit.

If coverage is your real problem, read mesh Wi-Fi vs a single router and why your Wi-Fi is slow first. Slow Wi-Fi is frequently a placement or interference problem, not a hardware one, and a new modem won’t fix it.

Where to start this week

1. Pull your last bill and write down every equipment or Wi-Fi charge.
2. Check your plan page and broadband label to see whether equipment is included.
3. Do the break-even math using the formula above.
4. Look up your provider’s approved list and match it to your speed tier and any phone service.
5. Buy, install and activate using the provider’s app or activation page. Keep the rented box until your new one is working.
6. Return the rental equipment and get a receipt or tracking number. Providers may charge for unreturned equipment.
7. Secure the new router: change the admin password, set WPA3 or WPA2 encryption and turn on automatic updates. Our home Wi-Fi security checklist walks through it.
8. Check your next bill to confirm the rental fee is gone.

If you’re also rethinking the plan itself, compare fiber, cable and 5G home internet and check what internet speed you actually need. Dropping to a right-sized plan can save more than the equipment fee.

Conclusion

Buying your own modem and router is a good deal when you pay a monthly rental fee, plan to stay with your provider past the break-even point and pick a model on the approved list. If your plan already includes equipment, or you move often, renting may be the smarter choice. Either way, the 10 minutes it takes to read your bill and broadband label will tell you which camp you’re in.

Sources

• FCC: Glossary of terms used for consumer broadband labels — monthly price vs monthly fees such as modem rental
• FCC Report and Order on broadband labels (FCC 22-86) — label requirements, including listing equipment rental fees
• Xfinity: Compatible devices for Xfinity Internet — compatibility check, customer responsibilities and fiber routers
• Spectrum: WiFi service — modem included, Advanced WiFi pricing and bring-your-own router
• CableLabs: DOCSIS 3.1 and gigabit speeds — what DOCSIS 3.1 supports