[Free Article] Too Late to Ask: "What is 'Overpaid Money'?"

Overpaid money.
As the name suggests, it is money that was paid in excess.

In the context of debt consolidation, "overpaid money" refers to the portion of payments made in excess when a borrower has paid interest beyond what was legally required.
Requesting the return of this money is called "a claim for the return of overpaid money", and it is a fresh memory that for a time, legal offices were flooding television with commercials for this service.
Many people likely learned the names of super-famous law firms, whose lawyers now frequently appear in the media, through TV commercials advertising overpaid money return claim services.
Recently, I often see commercials on TV for judicial scrivener offices featuring actress Mayumi Ono. Since this actress had her big break about 20 years ago in commercials for a major consumer finance company, this is truly a "foreshadowing payoff" 20 years in the making.

Regardless of that, what exactly is "overpaid money" in the first place?
I suspect there are surprisingly few people who can answer that accurately.
This time, I would like to explain this thoroughly.

■ The Mechanism Behind How "Overpaid Money" Occurs

"Overpaid money" occurs because there was a system in place that allowed borrowers to pay excessive interest to financial companies.
That system existed because, for some reason, there was a period when it was permitted to charge interest rates higher than those currently regulated by law.

① "Interest Rate Restriction Act" (Enacted in 1954)
・If the principal is less than 100,000 yen: 20% annual interest rate
・If the principal is 100,000 yen or more but less than 1,000,000 yen: 18% annual interest rate
・If the principal is 1,000,000 yen or more: 15% annual interest rate
This is a law stating that one must not lend money at rates exceeding the above percentages.
When borrowing money from banks, the interest rates are set within the limits of this law from the start, so "overpaid money" does not occur. However, for some reason, until a certain period, consumer finance companies were able to slip through the "net" of this law.

② "Act Regulating the Receipt of Contributions, Receipt of Deposits and Interest Rates, etc." (Enacted in 1954, commonly known as the "Investment Act")
・If money is lent at an annual interest rate exceeding 29.2%, it becomes subject to criminal penalties
③ "Act on Regulation of Money Lending Business" (Enacted in 1983, commonly known as the "Money Lending Business Act")
・If a debtor voluntarily pays interest exceeding the regulations in ① to a money lender, it is recognized as a valid repayment (deemed repayment)
For example, a user who borrowed 500,000 yen only had an obligation to pay up to 18% interest according to ①, but if the financial company requested a higher interest rate and the user complied, it was treated as a deemed repayment under ③, meaning the regular interest was recognized, and as long as it was within the range of ②, the company would not be punished, creating such a situation.

Because of this, consumer finance companies at the time set interest rates in the 25% to 29% range to lend money.
Of course, users agreed to this when borrowing, so they were charged that interest and complied with it.
This interest rate, which exceeded ① but was within the range of ②, is commonly called "gray zone interest", and "overpaid money" occurs when you have been repaying money borrowed at this gray zone interest rate.
This is the mechanism behind the occurrence of "overpaid money".

■ The Background of How "Overpaid Money" Became Claimable

As mentioned above, it was strictly a "gray zone" and not black, so financial companies were taking interest within a range where they "would not be punished," but why did it become possible to claim it as "overpaid money"? That is because the laws in ② and ③ were amended.

② "Act Regulating the Receipt of Contributions, Receipt of Deposits and Interest Rates, etc." (Amended in 2010, commonly known as the "Investment Act")
・If money is lent at an annual interest rate exceeding 20.0%, it becomes subject to criminal penalties
③ "Money Lending Business Act" (Amended in 2010, law name also revised)
・Prohibition of deemed repayment, abolition of gray zone interest

The amended laws for both ② and ③ were enforced starting June 18, 2010, so from this point on, it became possible to claim "overpaid money" for interest that had been repaid before the enforcement of the amended laws. In other words, legal offices began their work regarding "overpaid money" from this time, which is why we started seeing TV commercials frequently. Incidentally, since the bill itself was passed in 2006, major consumer finance companies were already signing contracts that eliminated gray zone interest by 2007, and for this reason,
there is almost no "overpaid money" for people who signed contracts after 2007. In other words, people who had not reached the age of 20 at this point—meaning those under 37 years old as of 2025—can almost certainly not make a claim for the return of overpaid money.

■ The Statute of Limitations for "Overpaid Money"

The statute of limitations for "overpaid money" is 10 years from the time the right to claim the overpaid money is lost.
Specifically, it is 10 years after the debt is fully repaid.

Furthermore, due to the 2020 Civil Code amendment, "5 years from the time you become aware that you can claim overpaid money" was added, but since the statute of limitations is established by whichever comes first—that or "10 years after full repayment"—it is not an amendment favorable to the user side. Specifically, if you request transaction history from a financial company, you can become aware of the overpaid money through this, and the statute of limitations will be established 5 years from that point, which is content favorable to the financial company side. However, since it is rare for individuals to do this on their own, you can usually consider it to be "10 years after full repayment."

In any case, once 10 years have passed since the debt was fully repaid, you will no longer be able to claim the return of "overpaid money."
The reason why TV commercials regarding overpaid money have decreased recently is partly because advertising placements have dispersed to the internet and other media, but also because, fundamentally, it has become less likely to expect a return of overpaid money due to the statute of limitations.

In other words,
"debt contracted before 2007" that was repaid
"to a consumer finance company, not a bank", and
"10 years have not passed since full repayment (as of 2025, it means it was fully repaid in 2015 or later)" or "currently still in use (if there is a long period where you did not borrow after paying it off in the middle, it is not eligible)", these are the
quite specific conditions for "debt" that make it eligible for an "overpaid money" return claim.

However, since humans tend to want to forget unpleasant things, there are many cases where you unexpectedly find debt that is subject to overpaid money that you yourself had forgotten about.
If you think even slightly, "Could it be?", it would be best to try contacting a law firm.

The following is a link for an advertising project.
If you register on LINE and send a message saying you have a question about overpaid money, you can consult for free. If you decide you don't want to consult anymore halfway through, you can block immediately, so I think it's fine to try consulting.