This is the lesson that explains why anyone bothers holding a bond at all, so it is a genuinely cheerful one. The whole appeal of a treasury bond is the coupon: a small, steady payment that lands in your account every single day, just for holding the bond. You do not have to click anything, claim anything, or remember to collect it - the payment simply arrives, day after day, quietly and automatically, exactly like the government bonuses you met in the Politics chapter. It is about as close to "money while you sleep" as this game offers.
How much, and how often
The coupon is a percentage of a bond's face value, paid once per day - and the exact percentage depends on which batch your bond came from. The 10,000 bonds a country starts with pay 0.25% of face every day. Bonds from later issues pay whatever rate their issuing law chose, anywhere from 0.1% to 1% a day, so two bonds from the same country can pay very differently and the rate is always worth a glance before you buy. Whatever the rate, the arithmetic is a straight line: hold ten times as many bonds and you are paid ten times as much, every day, in exact proportion. The payment is made once each day per country, so however often you check the page, you are paid a single clean coupon per day for the bonds you were holding, not a trickle every hour.
It is worth doing the sum once, slowly, because the result is more generous than the small percentages suggest. A Romanian bond from the opening emission has a face value of about 0.46 RON and pays 0.25% of that a day - a little over 0.001 RON. That sounds like nothing. But run it for the full year the bond lives, and those daily crumbs add up to roughly 0.42 RON, which is very nearly what you paid for the bond in the first place. And on top of that, when the bond matures you get your 0.46 back too. That is the quiet power of a coupon: it is tiny each day and substantial over a lifetime, and it is why patient bondholders do rather well.
The money comes out of the issuing country's state budget and lands in your balance in that country's national currency. This is the same shared treasury that collected your money when you first bought the bond, so you can picture it clearly: you paid in once at purchase, and the budget pays you back a little every day thereafter. Over enough days the coupons add up to more than you paid, which is the whole point of lending in the first place - but that only holds while the treasury stays healthy enough to keep paying, which is exactly what the next lesson is about.
Only bonds you actually hold earn the coupon
The coupon is paid on bonds sitting in your holdings - the ones that are truly yours right now. Bonds you have listed for sale are in escrow and do NOT earn the coupon while they wait for a buyer, and the treasury's own unsold bonds earn nothing either. So a bond only pays you while you are genuinely holding it, not while it is parked on the market.
The little trade-off: hold or sell
That last point hides a small, interesting decision that every bondholder faces, and it is worth thinking through calmly. While a bond sits in your holdings it pays you the daily coupon, but it is not for sale, so you cannot turn it into cash on a whim. The moment you list it for sale to try to capture a price you like, it stops earning the coupon while it waits in escrow. So you are always gently choosing between two good things: the steady daily income of holding, or the chance to sell at a price you fancy. There is no wrong answer - it simply depends on whether you value the trickle of income or the flexibility of cashing out.
For most new players, the happiest approach is the simplest: buy some bonds in a healthy country and just hold them, letting the coupon roll in day after day while you get on with the rest of the game. Selling is there when you want it - to free up money, or to take a profit if another player will pay you more than you paid - but you never have to sell, and there is no penalty for simply holding for a long time. The Dividends tab on the Bonds page keeps a running record of the coupon payments that have been made, so you can always see the income flowing, both to you and across the country as a whole.
The day it ends: maturity
A bond does not pay forever, and this is the one part of the arrangement that surprises people who have skipped ahead. Every batch of bonds is created with a maturity date fixed at the moment it is issued - one year for the 10,000 a country starts with, and anywhere from one month to twelve for later issues. On that date the loan simply comes to an end, exactly as a real loan does. The treasury buys the bonds back from whoever is holding them, pays face value into their account, and the bonds are retired for good. Your coupons stop, because the debt no longer exists.
Nothing at all is asked of you when that day comes. Redemption is automatic: you do not have to sell, claim or remember anything, and you are paid face value whether you bought the bond at par, above it or in a bargain-hunting moment well below it. Even bonds you left sitting unsold on the market are redeemed - the listing is cancelled, the bonds come back to you, and the money goes to you rather than the buyer who never arrived. So the full life of a bond is a tidy loop: you pay face value in, the coupon trickles back day after day, and at maturity your face value comes home. Everything the coupons paid you along the way is profit.
Check the maturity date before you buy
A bond that matures next month will pay you a month of coupons; one that matures in a year will pay you twelve times as many. Two bonds at the same price and the same rate can therefore be worth wildly different amounts to you, purely because of how long they have left to run. The market shows every offer's maturity date beside its rate - read both, not just the price.
So the coupon is the heartbeat of the whole system: a daily slice of face value - 0.25% for a country's opening bonds, and between 0.1% and 1% for anything issued later - paid once a day out of the state budget, in the national currency, on every bond you are actually holding. List a bond and it stops paying until it sells or you cancel; hold it and the coupon keeps arriving right up to the maturity date, when your face value is handed back and the bond retires. In the next lesson we look at the one thing that decides whether all of this keeps running smoothly - the health of the treasury behind the bond, and the credit rating that measures it at a glance.