The Math Behind Solar Panels: Are You Really Saving Money?

If your jaw dropped at the price tag on a solar panel system, you’re not the only one. Once the sticker shock wears off, your next question may be: “Will this actually save me money?”

For many homeowners, the answer is yes, but solar is still a large financial commitment. That’s where a home improvement loan comes in. Rather than draining your savings all at once, you can break that big number into more manageable monthly payments. 

Ready to crunch the numbers? Here’s a closer look at how to figure out whether solar is worth it for your home.

How to calculate your solar savings

To calculate your potential savings with solar panels, start with some basic math.

First, take what you’d normally spend on electricity over time. Subtract the total cost of going solar, including panels, installation and financing — minus any incentives you score.1

The result can help you gauge whether solar panels will save you money in the long run.

Determine how much you spend on electricity

First, you need to know what you’re spending on electricity right now. To do so, dig up your last 12 months of bills and find your average monthly cost.

If you’ve gone paperless, just log into your online utility account to retrieve historical billing statements. 

Find out the upfront cost of solar panels

Generally, the more electricity your home uses, the larger your system will be — and yes, bigger tends to mean pricier. 

To get a real sense of what you’d pay, shop around and get quotes from a few different installers, factoring in installation, permitting and any equipment upgrades.

Subtract incentives and tax credits

Many states offer clean energy incentives to homeowners. To find out what incentives you may qualify for, head over to the Database of State Incentives for Renewables and Efficiency (DSIRE). The tool itself is pretty simple. Just plug in your ZIP code, and it’ll show you which programs are available where you live.2

One thing to remember: Incentives don’t always stick around forever. For instance, the Residential Clean Energy Credit, a major federal residential solar tax credit, expired at the end of 2025 and no longer applies to systems installed after that date.3 

Before you lock in your numbers, double-check that the programs you’re counting on are still live.

Check how long it takes to break even

Like many home improvements, solar panels typically involve an initial investment. Your payback period is the point at which your cumulative savings equal what you spent on your solar panels.

Work with your solar installer to calculate your payback period in three steps:

1. Subtract any upfront incentives from your total system cost.
2. Multiply your average monthly utility bill by 12, then subtract any annual incentives. That’s your annual benefit.
3. Divide the result from step one by the result from step two. That’s your payback time in years.4

One thing worth considering is how long you actually plan to stay in your home. If you’re planning to move in two or three years, you might leave before solar pays off. This investment tends to make more sense for homeowners who plan to stay in their home for the long term.

Factor in maintenance and long-term costs

Solar panels are typically low maintenance, but they’re not completely hands-off. 

It’s smart to set aside a little money for occasional cleaning and unexpected repairs, so your overall budget estimate stays accurate. A strong installer warranty can also help you protect your investment if something goes wrong.

Consider how you’ll finance the system

Not everyone has $20,000 to spend on solar panels, and that’s OK. Financing lets you break that big number into monthly payments that are a lot easier to swallow.

In fact, when you add your monthly loan payment to your now-smaller electric bill, the total could end up being about the same as — or even less than — what you were paying before solar.

Financing is not a new concept for homeowners. People take out home improvement loans for kitchen remodels and even classic car loans for dream rides. Solar can be one of those upgrades that can offer a true return on investment. 

Whatever route you go, just make sure you know what that monthly number looks like before you commit to anything. The last thing you want is to go green on energy and accidentally go red on your budget.

Deciding if solar is right for your home

Short answer? Yes. For many homeowners, solar really does pay off. 

But before you commit, do your homework: shop around for quotes, dig into the incentives your state offers, and make sure your payback period matches how long you plan to own your home.