お金を貸す

The grammar is straightforward but the particles are the boss here. You use the pattern: [Person] に [Money] を貸す. The person receiving the money gets the に (ni) particle because they are the destination of the cash. The money itself gets the を (o) particle because it’s the thing being acted upon. If you're at a fancy dinner and need to sound professional, you might use the polite form 貸します (kashimasu). If you're texting a buddy about a 500 yen coffee, 貸すよ (kasu yo) is your go-to. Just don't accidentally say お金を借りる (okane o kariru) unless you're the one asking for the loan. That's a mistake that could cost you a lot of face—and potentially some interest! One fun tip: in Japan, people often avoid saying the exact word "money" if they can help it, using gestures or context, but when the transaction is clear, お金を貸す is the standard, unavoidable term.

You'll hear this in Netflix dramas right before a massive betrayal. "Why did I lend him money?" (なんで彼にお金を貸したんだろう？). You’ll also see it in your banking apps or when splitting a bill on a night out in Shibuya. Speaker A: "I forgot my wallet!" Speaker B: "I'll lend you some for now" (とりあえず、お金を貸すね). Even in the world of gaming, if you're playing an RPG like Yakuza, NPCs will constantly be asking you to お金を貸す. It’s the ultimate plot device. On TikTok, you might see "Point of View" (POV) videos where a friend asks for money and the creator uses お金を貸す to set the scene. It's a phrase that moves between the high-stakes world of finance and the low-stakes world of "I forgot my transit card."

Use this phrase when the intention is a loan. It fits perfectly in situations like:

• Paying for a friend’s Uber because their app is glitching.
• Loaning a coworker 1,000 yen for lunch when the credit card machine is down.
• Discussing a formal bank loan (though you might use more technical terms there, 貸す is the root).
• Telling a story about how you helped someone out in a pinch.

It’s a neutral phrase, so it works with friends, family, and occasionally in business, provided you adjust the politeness level of the verb.

Avoid using お金を貸す if you don't actually expect the money back. If you're treating a friend to a birthday drink, use おごる (ogoru - to treat). If you're donating to a streamer on Twitch or a charity, use 寄付する (kifu suru). Using 貸す when you mean "give" creates an awkward social debt that your friend might feel pressured to pay back. Also, be careful in very formal business settings; while 貸す isn't wrong, professionals might use 融資する (yūshi suru - to finance/invest) or 貸し付ける (kashitsukeru - to provide a loan) to sound more corporate. Don't use it if you're the one borrowing—that’s the quickest way to confuse your Japanese teacher!

The absolute classic blunder is swapping 貸す (lend) with 借りる (borrow).

✗ 友達にお金を借りました (when you meant you lent it to them)

✓ 友達にお金を貸しました

Think of it this way: Kasu starts with 'K', and so does 'Kindness' (lending is kind). Kariru starts with 'K', but so does 'Keep' (you keep what you borrow). Another mistake is forgetting the に particle for the recipient. If you use と (to), it sounds like you and the friend are together lending money to a mysterious third party.

If you want to sound more like a native, you can try 金を貸す (kane o kasu). Dropping the お (o) makes it much more masculine, rough, or casual. It sounds like something out of an anime or a gritty crime movie. Then there is 小銭を貸す (kozeni o kasu), specifically for lending small change. If you're lending something that isn't money, like a pen or an umbrella, you just use 貸す without the お金. For example, 傘を貸す (kasa o kasu - lend an umbrella). In a more formal context, 貸与する (taiyo suru) is used for lending equipment or official items in a company.

You’ll often see this phrase in its potential form: お金を貸せる (okane o kaseru - can lend money). For example, "Can you lend me money?" becomes お金、貸してくれる？ (Okane, kashite kureru?). Adding the ~てくれる (te kureru) helper verb is crucial because it adds the nuance of "doing a favor for me." Without it, you’re just stating a robotic fact. Another variation is the causative: お金を貸させる (okane o kisaseru), which means "to make someone lend money." Hopefully, you don't find yourself in a situation where you're using that one—it sounds a bit like a heist movie!