Solar panels in Missouri cost $2.70 to $3.10 per watt for a complete installed residential system before incentives. A typical 7-kilowatt system costs $19,000 to $22,000. After the 30 percent federal tax credit, the net cost drops to approximately $13,300 to $15,400. Here is the full cost breakdown, what drives the price, and how Missouri compares to neighboring states.
Installed System Cost by Size
| System Size | Installed Cost (Before Incentives) | After Federal Tax Credit |
| 4 kW | $10,800–$12,400 | $7,600–$8,700 |
| 6 kW | $16,200–$18,600 | $11,300–$13,000 |
| 7 kW | $18,900–$21,700 | $13,200–$15,200 |
| 8 kW | $21,600–$24,800 | $15,100–$17,400 |
| 10 kW | $27,000–$31,000 | $18,900–$21,700 |
Missouri prices are at or slightly below the national average of $3.00 to $3.30 per watt. The installer market in the St. Louis and Kansas City metros is competitive enough to keep pricing in check. Rural areas may see slightly higher prices due to fewer installer options and longer travel distances for installation crews.
Where the Money Goes
A $20,000 residential solar installation breaks down approximately as follows. The panels themselves account for $5,000 to $6,000, or 25 to 30 percent of the total. The inverter accounts for $1,500 to $2,500 for a string inverter with optimizers or $2,500 to $4,000 for microinverters. Racking and mounting hardware is $1,500 to $2,000. Balance of system components including wiring, conduit, disconnects, and the electrical panel connection total $1,000 to $1,500. Labor for installation is $4,000 to $6,000, or 20 to 30 percent. Permitting, engineering, and interconnection fees are $1,000 to $2,000. Sales and overhead, including the installer’s margin, customer acquisition cost, and project management, rounds out the remaining $3,000 to $5,000.
The panels themselves are a minority of the total cost. This is why waiting for panel prices to drop further has diminishing returns. A 20 percent reduction in panel cost reduces the total system price by only 5 to 6 percent. The labor, permitting, and overhead costs are not falling at the same rate as panel prices.
Missouri Incentives That Reduce the Cost
The federal solar investment tax credit covers 30 percent of the total system cost. There is no cap. The credit applies to the panels, inverter, racking, labor, permitting, and sales tax. It also applies to a battery if the battery is charged exclusively by the solar system. The $6,000 credit on a $20,000 system is a dollar-for-dollar reduction in federal taxes owed.
Missouri exempts solar systems from property tax assessment. The added home value from solar does not increase your annual property tax bill. This is worth approximately $100 to $300 per year depending on your county’s tax rate and the value of your system, and it continues for the life of the system.
Missouri does not currently offer a state-level tax credit or rebate for residential solar. Ameren Missouri and Evergy have offered limited rebate programs in the past, but these are subject to annual funding caps and are not guaranteed. Do not budget for a utility rebate. Treat it as a bonus if one happens to be available.
If you install a battery with your solar system, the battery qualifies for the 30 percent federal credit only if it is charged entirely by solar. A battery that also charges from the grid, such as during off-peak hours for time-of-use arbitrage, may not qualify for the full credit on the battery portion. Confirm with your tax professional.
Missouri vs. Neighboring States
| State | Cost per Watt | 7 kW System (Before Credit) | State Incentives |
| Missouri | $2.70–$3.10 | $19,000–$22,000 | None (property tax exemption) |
| Illinois | $2.80–$3.20 | $20,000–$22,500 | SREC market, state rebates |
| Kansas | $2.60–$3.00 | $18,000–$21,000 | None |
| Arkansas | $2.70–$3.10 | $19,000–$22,000 | None |
| Iowa | $2.80–$3.20 | $20,000–$22,500 | State tax credit available |
Illinois is the standout in the region for solar incentives. Its SREC market and state rebate programs significantly reduce the net cost compared to Missouri, despite similar gross installation costs. A 7-kilowatt system in Illinois can have a net cost of $10,000 to $12,000 after all incentives, compared to $13,000 to $15,000 in Missouri.
Cash vs. Loan vs. Lease Costs
Cash purchase produces the lowest total cost. You pay the installer directly and receive the full federal tax credit. A 25-year solar loan allows zero-down installation with monthly payments. Interest rates for solar loans in Missouri range from 4 to 8 percent depending on the term and your credit. The total amount repaid over the life of the loan is 30 to 60 percent higher than the cash price due to interest. The monthly loan payment is typically less than your previous electric bill, so you save from month one despite the higher total cost.
A solar lease or power purchase agreement means a third party owns the panels on your roof. You pay a fixed monthly rate. The third party keeps the federal tax credit and any incentives. Leasing generally produces lower total savings than purchasing but requires no upfront cash and no loan application. Leasing is the right choice only if you do not qualify for the federal tax credit because your tax liability is too low to use the full credit and you cannot or do not want to finance a purchase.
Frequently Asked Questions
How do I get the lowest price on solar in Missouri?
Get at least three quotes from local installers with at least five years of operating history in Missouri. Ask for the cash price, not the financed price, so you can compare quotes on an equal basis. The financed price includes the cost of the loan, which varies by lender. Ask each installer to quote the same system size in kilowatts using the same panel type. A quote for a 7-kilowatt system using Qcells panels can be compared directly to another 7-kilowatt Qcells quote. A quote for a 6.5-kilowatt system using a different panel cannot. Time your installation for late fall or winter when installer backlogs are shortest. Some installers offer off-season discounts of 5 to 10 percent.
Can I buy the panels myself and hire an electrician to install them?
You can, but most experienced solar installers will not install customer-supplied equipment. They cannot warranty panels they did not source, and they do not want the liability for equipment failure on panels of unknown origin. If you hire a general electrician who does not specialize in solar, the installation quality, permitting, and interconnection are your responsibility. The savings from buying panels yourself are typically offset by higher labor costs and the loss of the installer’s workmanship warranty. For most homeowners, the risk and hassle are not worth the marginal savings.
