Add-On Interest

  

Add-on interest is a new math way of accounting for, or paying off, bond debt.

Add-on interest adds on the cost of interest each period to the principal of a loan so that, at the end of the period, a huge debt is owed, payable at the time the principal is owed.

You borrow a hundred grand at 6% for five years with add-on interest. Every six months, another three grand is tacked onto that hundred grand that you owe. Or rather, the new debt that you owe after six months is $103,000, on which you then pay a half year's interest of that 6%, or 3%, on $103,000. And the compounding continues to get uglier.

Think of it as the debtor's version of acute zero coupon bond.

Related or Semi-related Video

Finance: What is a Muni Bond?24 Views

00:00

finance a la shmoop. what is a muni bond? all right well this is a moonie bond or

00:09

band as they say in America. all right and this is a muni bond or municipal [people in orange robes sing together]

00:18

bond. yeah that muni thing there is for short.

00:20

well muni bonds function differently from the way in which normal corporate

00:24

bonds function in America. municipal bonds are financing that cities do to

00:30

raise money. think local think townhall meetings like old folks arguing about

00:35

where to install new speedbumps. think angry local residents berating their

00:40

federal senators .though this stuff might sound like small change local government

00:45

is the backbone of the US of A. without your lovely local government you

00:50

wouldn't have sewer systems,or local roads, or that one Park you and your

00:55

friends hang out at when you're up to no good. yeah we know we've seen you on the

00:59

video camera. alright so muni bonds are a must-have in [pictures of people in parks]

01:02

society ,not a nice-to-have. and as a result we treat them specially.

01:06

that is we don't tax the interest they throw off and that's a big deal. a

01:10

corporate bond yielding 7% to investors who pay 40% tax gives investors a net

01:17

yield after taxes of 1 minus point for their times seven equals four point two

01:23

percent. well a muni bond can pay just four point three percent - ie slightly

01:28

more net than a corporate bond with the same risk and be a good deal for its

01:33

buyers. that difference of two point seven percent in interest is a huge

01:37

difference over time in the cost of capital from municipalities already

01:42

strapped for cash trying to raise money desperate to get that new sewer system [equation showing bond return rates]

01:46

in place for well you know a whole variety of reasons. and you know use that

01:50

rule of seventy two thing you here remember you divide the 2.7 and 72 ,yah

01:55

that's how many years it takes to double, okay, but what happens when a Muni can't

02:00

pay its bills, well in corporate America the bondholders just take possession of

02:04

the company operate it with new management pay off the debts they're

02:07

owed and well then sell it more or less. but with muni bonds you can't just

02:11

auction off a sewage treatment plant or a Reservoir Dam on

02:15

eBay. they'd sell it a huge discount for what money went into him like well maybe [ebay listing shown]

02:20

you sell them to a golf course developer or well maybe they just don't sell it

02:24

all there are zero residual value and yes

02:26

ouch. so muni bonds get treated with a little bit different perspective on risk

02:31

like the city is on the hook for them in different ways, and there are two basic

02:35

flavors of muni bonds as far as they're being backed. there's general obligation

02:40

bonds which are bonds backed by The Full Faith and Credit of the city, and then

02:43

there are revenue bonds backed only by sales expected to be reaped from a

02:48

specific project, say you know that new 8 story parking structure in the middle of

02:53

town which charges you 40 bucks a day to park your car.

02:56

well that 40 bucks or at least part of it would go back to repay the owners of [parking garage pictured]

03:00

the revenue bond. so why wouldn't you knee bones be backed in two different

03:04

ways? well because investors like to know what happens if the city doesn't pay

03:09

back its bills. general obligation bonds are backed by the city's ability to tax

03:14

its citizens. that's that under Full Faith and Credit thing. that is the

03:19

general obligation bonds oblige- see that's that obligation thing- they oblige

03:23

the entire city generally to pay its bills. like even if they have to double

03:28

tax the rich people in the city hoping they don't move out you know pay back

03:32

the money they borrowed. if a city ever renigs well they'll lose that Full Faith

03:37

and Credit from investors, and well good luck ever raising money again, or at

03:41

least certainly at any kind of favorable rates. with revenue bonds the backing is

03:46

narrower, the project is riskier, and usually the interest rates that come [types of muni bonds]

03:50

with it are higher. payment on these bonds comes from the revenue generated

03:55

from what the bonds were used to create. right like bonds to build a toll road or

03:59

another example here. thought it may be better than the parking authority thing

04:02

yeah okay okay. all right well the issuer can estimate fairly accurately the

04:06

revenue that will be generated from those tolls and then it's up to the [equation pictured]

04:09

investor to decide if that revenue will be sufficient enough to service the debt

04:14

on the bond. and historically muni bonds are very safe .only a handful of muni

04:19

offerings in the US have ever not paid back everything .so in the scheme of

04:23

things munis are a good risk. at least they have been as Illinois in

04:27

California begin to Teeter on the edges of bankruptcy it'll be interesting to

04:30

see what happens to the creditworthiness of their big cities, and whether they

04:34

manage to climb back up to steady ground or enjoy a nice skydive you know - the

04:39

parachute. either way Muni balance will remain one of the most

04:41

fundamental financial institutions of the US of A while a mooning bond well

04:46

that'll have to remain a personal fantasy. yes sounds look double o heaven. [person moons camera]

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