The short answer: a Tesla solar owner who financed a 4.08 kW system in 2021 at 0.99% APR is about to make a final interest charge of roughly 10 cents. The same kind of system today would face financing around 7.24% and, according to the owner, no federal tax credit. The story is small, but it shows how much loan timing can change what solar really costs.
Below, you'll find what the owner reported, what a 0.99% loan versus a 7.24% loan means in dollars, and how to judge solar financing today.
What Happened With the 10-Cent Solar Loan Payment?
A homeowner posted on the r/TeslaSolar subreddit that the last interest charge on their solar loan was expected to be about 10 cents. As reported by The Cool Down, the owner took out a 0.99% loan through Tech Credit Union for Tesla's entry-level 4.08 kW system in 2021, even though they had originally planned to pay cash.
The owner also compared it to today's market. They noted that Tesla's smallest system, now 4.2 kW, would cost about $10,600 and would carry 7.24% financing. They also said it would get no federal tax credit, which they summed up with "Oofff!"
These figures come from a self-reported Reddit post as relayed by a news site. Treat them as one homeowner's experience, not an official Tesla price list.
Why a 0.99% Solar Loan Is Almost Free Money
At 0.99%, interest is tiny compared with the system's price. Inflation alone can exceed that rate, so the loan is cheap in real terms. In 2021, Tesla also promoted a 10-year option at 0.99% APR with 10% down, according to CleanTechnica, which is the kind of offer this owner's loan reflects.
What does the rate difference cost? An illustration
The numbers below are my own estimates for a hypothetical $10,000 loan over 10 years with equal monthly payments. They are not quotes from Tesla or any lender.
| Scenario | Monthly payment | Total interest |
|---|---|---|
| 0.99% APR, 10 years | about $88 | about $510 |
| 7.24% APR, 10 years | about $117 | about $4,080 |
The takeaway: on the same $10,000, the higher rate costs roughly $3,500 more in interest. That is a third of the principal, paid only for borrowing at a different time.
Why Is Solar Financing So Different Today?
Three things appear in this story, and each one affects the real cost of going solar.
- Interest rates: a sub-1% rate was a promotional product in 2021. The 7.24% figure the owner cites is far higher.
- Incentives: the owner says a new system would receive no federal tax credit. Rules and eligibility can change, so check current federal, state and utility programs before you budget.
- System price and size: the entry system has grown slightly, from 4.08 kW to 4.2 kW, and the owner quotes about $10,600 for it.
Together, these mean the same basic purchase can cost far more to finance than it did a few years ago.
Should You Pay Cash or Take a Solar Loan?
The owner had planned to pay cash but chose the 0.99% loan instead. That is a classic decision: when borrowing is nearly free, keeping your cash can make sense. When the rate is high, the math changes.
When paying cash tends to win
- The loan rate is higher than what your savings could reasonably earn after tax.
- You have an emergency fund that stays intact after the purchase.
- You want to avoid a monthly obligation that lasts a decade.
When financing can still make sense
- The rate is low enough that the interest is small compared with your electricity savings.
- Paying cash would drain your reserves.
- Your bank, credit union or installer offers a promotional rate that beats other options.
This is general information, not financial advice. A licensed financial advisor can tell you what fits your situation.
How to Compare Solar Loan Offers
- Compare the APR, not just the monthly payment. A longer term can lower the payment while raising total interest.
- Ask about fees. Some solar loans bundle dealer fees into the price, which can raise your effective cost.
- Get at least one outside quote. Credit unions and banks sometimes beat installer financing, as the Tech Credit Union loan did for this owner.
- Check prepayment rules. Tesla's own support pages describe options such as an early payoff and a partial principal payment, which can reduce your term or your monthly payment. Read the details on Tesla's solar financing page.
- Confirm which incentives apply today. Do not assume a credit that existed in a past year is still available.
Frequently Asked Questions
Is the 10-cent payment really the last payment?
According to the owner's post, the final month's interest was expected to be about 10 cents. Exact payoff amounts depend on the lender's statement, so the real figure may differ slightly.
Is a 0.99% solar loan still available?
The owner reports that financing is now around 7.24%. Promotional rates change, so check current offers from Tesla, your installer and local lenders.
Can I transfer Tesla solar financing if I sell my home?
Tesla's support page says the solar agreement may be transferred to a new owner, but the associated financing is not transferable.
Is solar still worth it at a 7% loan rate?
It can be, but the payback period lengthens. Compare your expected electricity savings with your total loan cost, including interest, before you decide.
The Bottom Line
A 10-cent final payment is a fun headline, but the useful lesson is about timing. The same solar purchase can cost very different amounts depending on the rate and incentives available when you sign. If you are considering solar now, compare several financing offers, run the total-interest math, and verify current incentives before you commit.
Next, you could read a related guide on how solar loans compare with paying cash, or explore our other home energy articles.