Solar Panel Cost Calculator 2026
Enter your system size, region and electricity rate to instantly see your annual savings, payback period and 25-year profit projection. Reflects the 2026 reality — the 30 % federal tax credit expired Dec 31, 2025 — with a rebate field for state and utility incentives, and accounts for battery storage self-consumption.
☀️ Your System Details
⚠️ US federal note: the 30% residential solar tax credit (IRA §25D) expired December 31, 2025 under the One Big Beautiful Bill — systems installed in 2026 get no federal credit (a 2025 install can still be claimed on Form 5695). Enter any state or utility rebate here — or, in Australia, your STC-equivalent percentage. Default 0 reflects no federal credit.
📊 Your Results
Annual Production & Self-Consumption
Energy Split (Year 1)
⚡ Pro Tip: Size it right
Aim for a system that covers 80–100 % of your annual usage. Going bigger earns more export income but may have diminishing returns if your utility pays less for excess. Adding a battery doubles self-sufficiency — ideal if your utility has reduced net metering rates. Note: the federal solar & battery tax credit expired Dec 31, 2025, but many state and utility storage rebates still apply in 2026.
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Solar Panel Costs in the US and Australia (2026)
Solar panel prices have dropped over 90 % since 2010, making rooftop solar one of the best financial decisions a homeowner can make. Here’s what to expect by market.
United States: System Cost by Size
| System size | Cost in 2026 (gross) | If 2025 install (−30 %) | Typical home size |
|---|---|---|---|
| 4 kWp | $12,800 | $8,960 | Small home / low usage |
| 8 kWp | $25,600 | $17,920 | Medium home (2,000 sq ft) |
| 12 kWp | $38,400 | $26,880 | Large home / EV charger |
| 20 kWp | $64,000 | $44,800 | Large home + pool + EV |
Based on $3,200/kWp installed average. In 2026 the gross price is what you pay — the 30% federal credit expired Dec 31, 2025 (the right column applied to 2025 installs only). State and utility rebates can still reduce the 2026 cost. Prices vary by installer and region.
Australia: System Cost by Size
| System size | After STC rebate (AUD) | Annual yield (QLD) | Payback (QLD) |
|---|---|---|---|
| 6.6 kWp | $4,500–$7,500 | 12,800 kWh | 3–5 years |
| 10 kWp | $7,000–$11,000 | 19,500 kWh | 4–6 years |
| 13.2 kWp | $9,000–$14,000 | 25,700 kWh | 4–7 years |
Solar Resource by Region: How Much Can You Produce?
The amount of sunlight available — measured as peak sun hours or specific yield (kWh/kWp/year) — varies dramatically by location and is the biggest driver of your system’s financial performance.
| Region | Specific yield | 10 kWp annual output | Relative performance |
|---|---|---|---|
| US – Southwest (AZ, NM) | 2,000 kWh/kWp | 20,000 kWh | Excellent |
| US – California | 1,850 kWh/kWp | 18,500 kWh | Excellent |
| AU – Queensland | 1,950 kWh/kWp | 19,500 kWh | Excellent |
| AU – South Australia | 1,750 kWh/kWp | 17,500 kWh | Very good |
| US – Southeast (FL, TX) | 1,650 kWh/kWp | 16,500 kWh | Very good |
| AU – New South Wales | 1,600 kWh/kWp | 16,000 kWh | Very good |
| US – Midwest | 1,350 kWh/kWp | 13,500 kWh | Good |
| US – Northeast | 1,250 kWh/kWp | 12,500 kWh | Good |
| AU – Victoria | 1,450 kWh/kWp | 14,500 kWh | Good |
| US – Pacific NW | 1,200 kWh/kWp | 12,000 kWh | Fair |
The 30% Federal Solar Tax Credit Expired in 2026
Most solar calculators online still advertise a 30% federal tax credit. For a 2026 installation that is no longer correct. The Residential Clean Energy Credit (IRA §25D) — the 30% credit on residential solar and battery storage — was repealed by the One Big Beautiful Bill (signed July 4, 2025) for any system placed in service after December 31, 2025.
What this means for 2026
- 2026 installs get no federal solar tax credit — the 30% ITC/§25D no longer applies.
- Systems installed in 2025 or earlier can still claim the 30% credit on IRS Form 5695 with their 2025 return.
- State and utility rebates still exist in many areas (check DSIRE) — enter yours in the calculator’s rebate field.
- Net metering and time-of-use economics are now the main financial levers — and a battery matters more where net metering was cut (e.g. California NEM 3.0).
- Australia is unaffected: the STC rebate is a separate national scheme and still applies.
Example: 10 kWp System in California (2025 install — last year the credit applied)
| Gross system cost | $32,000 |
| Battery storage (10 kWh) | $8,000 |
| Total eligible cost | $40,000 |
| IRA 30 % credit (2025 install only) | − $12,000 |
| Net cost to homeowner | $28,000 |
Should You Add a Battery? (2026 Analysis)
Battery economics have shifted significantly since California’s NEM 3.0 cut retail-rate net metering in 2023. Under NEM 3.0, utilities pay as little as 5–8 ¢/kWh for exported solar instead of the previous 30 ¢/kWh retail rate. This makes self-consumption — and therefore batteries — far more valuable.
Battery makes sense when:
- Export / net metering rate is below your retail rate
- You want backup power during outages
- You have Time-of-Use (TOU) rates with peak pricing 4–9 pm
- You charge an EV at night (use cheap overnight rates + stored solar)
Battery less critical when:
- Full retail net metering applies (pre-NEM 3.0 CA, most AU states)
- System is small (< 5 kWp) and fully self-consumed
- Budget is tight — you can add storage later (note: no federal credit applies in 2026)
Pro Tip: Battery costs in 2026
A 10 kWh battery (e.g. Tesla Powerwall 3) costs ~$8,000–$12,000 installed. The federal 30 % credit that used to cut this to ~$5,600–$8,400 expired Dec 31, 2025, so a 2026 battery carries no federal credit. Many state and utility storage rebates remain, however — and where net metering has been cut, a battery still improves returns through higher self-consumption. Check your state’s programs before buying.
Frequently Asked Questions
How much does a solar panel system cost in the US?↓
A typical residential solar system costs $15,000–$30,000 (4–10 kWp). Cost per watt has fallen from $8 in 2010 to around $3.00–$3.50 today. Note for 2026: the 30% federal tax credit that used to cut this to $10,500–$21,000 expired December 31, 2025, so most homeowners now pay closer to the gross price unless a state or utility rebate applies.
Did the 30% federal solar tax credit expire?↓
Yes. The Residential Clean Energy Credit (IRA Section 25D) — the 30% credit on residential solar and battery storage — was repealed by the One Big Beautiful Bill (signed July 4, 2025) for systems placed in service after December 31, 2025. A system installed in 2025 or earlier can still be claimed on IRS Form 5695 with the 2025 return, but 2026 installs get no federal credit. State and utility rebates and net metering still apply in many areas.
How much will solar panels save me per year?↓
A typical 10 kWp system in California (1,850 kWh/kWp) produces about 17,000 kWh/year. At 30 ¢/kWh retail electricity, the annual saving is roughly $4,000–$5,000 including net metering export income. In Arizona with higher irradiance, savings are even higher. Use our calculator above for your exact numbers.
What is the payback period for solar panels?↓
For 2026 installs without the federal credit, most residential systems in the Sun Belt pay back in roughly 8–13 years, and in the Northeast 11–16 years; a state or utility rebate shortens this. (Systems installed in 2025 with the 30% credit paid back about 3–4 years sooner.) After payback, panels typically run 20–30 more years at near-zero fuel cost.
How much does solar cost in Australia?↓
A 6.6 kWp system costs AUD $5,000–$9,000 installed after the STC (Small-scale Technology Certificate) rebate. Per kWp costs around AUD $900–1,400 net. Queensland and South Australia have excellent solar resources — payback periods of 4–6 years are common.
Do I need a battery with solar panels?↓
Not necessarily. If your utility offers good net metering rates (paying close to retail for exported power), a battery adds $6,000–$12,000 for limited financial benefit. However, if net metering has been cut — as in many California NEM 3.0 markets — a battery dramatically improves self-sufficiency and financial returns. The calculator shows the difference.
What size solar system do I need?↓
Divide your annual kWh consumption by the specific yield for your region. Example: 12,000 kWh ÷ 1,850 kWh/kWp (California) = 6.5 kWp. Going slightly larger is usually worthwhile since marginal costs are low and you can export surplus. A 10 kWp system suits most US homes consuming 10,000–14,000 kWh/year.
How long do solar panels last?↓
Most quality panels carry a 25-year performance warranty guaranteeing at least 80–85% of original output. Actual lifespan is typically 30–40 years. Degradation is about 0.5% per year — a panel rated 400 W produces ~380 W after 10 years. Inverters typically last 10–15 years and may need replacement.