The 30% federal tax credit that made this an easy yes is gone. Here's the honest math without it.
Most articles about solar were written before December 31, 2025, and they're now wrong. The 30% federal residential solar tax credit (Section 25D) expired on that date, and it hasn't been replaced for homeowners who buy their system outright. If you're reading a "solar payback in 5-7 years" claim anywhere, check the date, it's almost certainly stale.
Without the federal credit, solar typically pays back in 7-14 years, up from roughly 5-9 years before. It's still worth financing if your electric bill runs $130+/month, your roof gets good sun, and you plan to stay 7+ years. Under those numbers, or planning to sell within 5 years, the math gets a lot weaker.
The federal credit didn't reduce your electricity savings, it reduced your upfront cost by 30%. Removing it doesn't touch the value side of the equation at all, electricity rates are still rising 2-8% annually depending on your state, and panels still last 25-30 years. What changed is purely the denominator in your payback math: the same system now costs 30% more out of pocket to reach the same savings.
Real example (California): A system with net savings of $3,069/year.
With the credit: system cost $18,840 net → payback in 4.3 years.
Without the credit: full cost applies → payback stretches to 6.1 years.
That's California, a high electricity-rate state where solar was already a strong case. In moderate-rate states, the same shift can push payback from around 9 years to 12-14.
| Item | Typical range |
|---|---|
| Average 8kW system (budget tier) | $19,900 – $23,200 |
| Average 8kW system (mid-range) | $23,300 – $28,800 |
| Average 8kW system (premium) | $28,900 – $33,200+ |
| Cost per watt (national average) | $2.49 – $4.15 |
| Payback period, cash or loan (2026) | 7 – 14 years |
| Payback period, lease or PPA | Positive cash flow from day one |
This is the single biggest decision point this year. Leases and power purchase agreements (PPAs) are financed and owned by a third party, which means that company, not you, claims a separate commercial tax credit (Section 48) that's still active through 2027. That's why lease pricing has actually stayed competitive even as purchase economics got harder.
Some solar loans carry dealer fees as high as 20-25%, added directly to your loan balance, not disclosed as a separate line item. On a $25,000 system, a 25% dealer fee adds $6,250 you're financing without necessarily realizing it. Always ask for the fee-inclusive APR, not just the advertised rate.
Yes, for owned systems specifically. Lawrence Berkeley National Laboratory research has documented a roughly $4 per watt resale premium for homes with owned solar, meaning a 9kW system can add approximately $36,000 in market value, separate from Zillow's broader estimate of about 4.1% average value uplift. Leased systems don't transfer this benefit the same way, since the buyer would be taking on your lease obligation, not gaining an asset.
5 quick questions, see what actually fits your situation
For homeowners who purchase systems outright (Section 25D), yes, it expired December 31, 2025. Third-party owned systems (leases and PPAs) can still access a separate commercial credit (Section 48) through 2027.
In some states, yes. Programs like Massachusetts' SMART, New Jersey's ADI, and Rhode Island's REG can replace 30-80% of the federal credit's value depending on your state and program specifics.
Most panels are rated for 25-30 years, with annual output degradation of roughly 0.5-0.9% depending on climate. Even after your payback period, a system still delivers 15-20+ years of essentially free electricity.
It depends on your rate on each. HELOCs are secured against your home and often carry lower rates than dedicated solar loans, but solar-specific loans sometimes bundle in fees that aren't obvious upfront. Comparing the true APR, not just the advertised rate, on both options is worth the extra 20 minutes.
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