Money

"Remember to spend your money."

- Round 5 on Bloons TD 1

"Building up a bit of a nest egg are we? Think carefully about what to spend it on - Money tends to get a bit tighter the higher you go in this game. Just sayin'."

- Round 47 on Bloons TD 5

"Spend your money wisely. You get less after round 50, and even less after 60."

- Round 48 in Bloons TD 4

Money, also known as Cash, is the main currency in the Bloons Tower Defense series and the mini-games of Bloons Monkey City (which have a style similar to BTD5). Players use money to buy towers, upgrades, and other special items. In Bloons TD 4, Bloons TD 5, and Bloons TD 6, the player can buy a Premium Upgrade called Double Cash Mode, which gives the player twice the money for each bloon popped and also starts the player out with twice the regular amount. No extra money is earned during Deflation Mode. Money has a "maximum limit", that amount depending on the type of game it is played on. Bloons TD4 iOS is at about $81,000,000, at that point the money increasing slows down to a crawl of normal. Bloons TD 5 Deluxe is limited to precisely $45,000,000, players cannot earn more, even utilizing abilities. The rest have no known cap.

Starting Cash
Throughout all of the Bloons Tower Defense series, the player starts off with $650, regardless of difficulty.

In Bloons Monkey City, however, because as the Bloons continuously get more and more difficult depending on tile difficulty, it has a different system of what amount of cash the player starts off with. At Level 1, the player normally starts off with $350 cash, but gets a bonus $100 for each new level. The equation for how much cash to start is 250 + 100x (when "x" means the level of player). Thus, at the highest level, Level 40, the player starts with up to $4250 (unless influenced by Special Missions, Special Items or Supply Crates). In the mobile version, the starting cash can max to $5250 (excluding other factors).

In Bloons TD 6, there is a Monkey Knowledge point that increases the player's starting cash by 200.

Obtaining Money
There are four ways you can get money:
 * One way is by popping Bloons:
 * {| class="wikitable" style="text-align:right"

! scope="col" style="vertical-align:bottom; width:145px" |Type ! scope="col" style="vertical-align:bottom; width:43px" |BTD ! scope="col" style="vertical-align:bottom; width:43px" |BTD2 ! scope="col" style="vertical-align:bottom; width:43px" |BTD3 ! scope="col" style="vertical-align:bottom; width:43px" |BTD4 ! scope="col" style="vertical-align:bottom; width:43px" |BTD5 ! scope="col" style="vertical-align:bottom; width:43px" |BMC ! scope="col" style="vertical-align:bottom; width:43px" |BTD6
 * align="left" |Red Bloons
 * 1
 * 1
 * 1
 * 1
 * 1
 * 1
 * 1
 * align="left" |Blue Bloons
 * 2
 * 2
 * 2
 * 2
 * 2
 * 2
 * 2
 * align="left" |Green Bloons
 * 3
 * 3
 * 3
 * 3
 * 3
 * 3
 * 3
 * align="left" |Yellow Bloons
 * 4
 * 4
 * 4
 * 4
 * 4
 * 4
 * 4
 * align="left" |Pink Bloons
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 5
 * 5
 * 5
 * 5
 * align="left" |Black Bloons
 * 9
 * 9
 * 9
 * 11
 * 11 (6)
 * 11 (6)
 * 11 (6)
 * align="left" |White Bloons
 * 9
 * 9
 * 9
 * 11
 * 11 (6)
 * 11 (6)
 * 11 (6)
 * align="left" |Purple Bloons
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 11 (6)
 * align="left" |Camo Bloons (BTD4)
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 11
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * align="left" |Lead Bloons
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 19
 * 19
 * 23
 * 23 (7)
 * 23 (7)
 * 23 (7)
 * align="left" |Zebra Bloons
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 23
 * 23 (7)
 * 23 (7)
 * 23 (7)
 * align="left" |Rainbow Bloons
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 37
 * 37
 * 47
 * 47 (8)
 * 47 (8)
 * 47 (8)
 * align="left" |Ceramic Bloons
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 73
 * 92
 * 95
 * 95
 * 95
 * align="left" |M.O.A.B.
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 292
 * 302
 * 381
 * 381
 * 381
 * align="left" |B.F.B.
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 1525
 * 1525
 * 1525
 * 1525
 * align="left" |Z.O.M.G.
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 6101
 * 6101
 * 6101
 * align="left" |D.D.T.
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 571
 * 381
 * align="left" |B.A.D.
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 13346
 * }
 * During Freeplay Mode in BTD 5 and BTD 6, all non-MOAB class Bloons only have one child. As a consequence, the money they give is reduced (except for Ceramics in BTD6, which give extra money to counteract this).
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 571
 * 381
 * align="left" |B.A.D.
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * style="font-size:80%; text-align:center; color:#909090" |N/A
 * 13346
 * }
 * During Freeplay Mode in BTD 5 and BTD 6, all non-MOAB class Bloons only have one child. As a consequence, the money they give is reduced (except for Ceramics in BTD6, which give extra money to counteract this).
 * During Freeplay Mode in BTD 5 and BTD 6, all non-MOAB class Bloons only have one child. As a consequence, the money they give is reduced (except for Ceramics in BTD6, which give extra money to counteract this).


 * Another way is earning Bonus Money by winning rounds:
 * In BTD5 players get $99 plus the number of the round, e.g. 100 for round 1, 101 for round 2, and so on ...
 * In BTD6 it's $100 plus the number of the round.
 * The third way is by using various towers or heroes that have upgrades to give you money. These include:
 * Banana Farms which have 3 very different ways of providing money each round.
 * Support Chinook or Special Poperations Special Ability for the Heli Pilot.
 * Sniper Monkeys with the Supply Drop or Elite Sniper upgrade.
 * The Engineer's Bloon Trap in BTD5 Deluxe or BTD5 Mobile.
 * The Engineer's Bloon Trap or XXXL Trap in BTD6.
 * The COBRA's Wired Funds upgrade in BTDB.
 * A True Sun God with support towers sacrificed to it.
 * Obyn Greenfoot's Wall of Trees ability.
 * Merchantmen, Favored Trades or Trade Empires upgrade for the Buccaneer in BTD6.
 * Jungle's Bounty and Spirit of the Forest upgrade for the Druid in BTD6.
 * The Monkeyopolis upgrade for the Village in BTD6.
 * The Benjamin Hero in BTD6.
 * Bloons that get popped by towers within the range of a Monkey Town give you 50% more cash than normal.
 * Bloons affected by the Lead to Gold give $50 or triple the income with Rubber to Gold in BTD6.
 * Using Powers
 * By purchasing a 'cash injection' with Monkey Money in BTD5 or purchasing and using a 'Cash Drop' power in BTD6.
 * The BTD6 Thrive power increases the income by a 25% (30% with Monkey Knowledge) for the current and the next round in which it's used.

Income Multipliers
Depending on the round, the total amount of money is reduced to some percentage.

BTD5-BTD6

 * 100% in rounds 1-50 (1-30 in BTD5 Mastery)
 * 50% in rounds 51-60 (31-60 in BTD5 Mastery)
 * 20% in rounds 61-85
 * 10% in rounds 86-100
 * 2% in rounds 101+

BATTD

 * 100% in rounds 1-39
 * 50% in rounds 40-49
 * 20% in rounds 50-64
 * 10% in rounds 65-75

NOTE: This is not true for the Martian Games

Bloons Monkey City
There is a sliding cash factor in BMC which means as the difficulty gets higher, the cash penalties will happen sooner.

The formula used for how many rounds sooner/later the penalties happen is determined by: round(6 - difficulty * 0.15)

Normal Mode

 * 110% for rounds before 11
 * 100% for rounds before 15
 * 65% for rounds before 22
 * 20% for rounds before 27
 * 5% for rounds 27+

Hardcore Mode

 * 100% for rounds before 15
 * 50% for rounds before 22
 * 20% for rounds before 27
 * 5% for rounds 27+

Bloon Beacon

 * 220% for rounds before 5
 * 200% for rounds before 7
 * 150% for rounds before 11
 * 60% for rounds before 13
 * 20% for rounds 13+

Income in Rounds

 * -|BTD6=
 * -|BTD5=


 * -|BTD4=


 * -|BTD3=


 * -|BTD2=


 * -|BTD=

Trivia

 * In BTD5, players earn a total of $124,458 between rounds 1-85 without anything to increase their income.
 * In BTD6 C.H.I.M.P.S. mode, players earn a total of $179,183 between rounds 6-100. Therefore, it is impossible to purchase either True Sun God and Legend of the Night due to their total upgrade costs exceeding the money available. Super Mines can be barely purchased although Spiked Mines cannot survive late game thus it is still impossible before beating Round 100.
 * According to Ninja Kiwi's August 20th 2021 blog, monkeys canonically can control the money in such a way that avoids inflation caused by the overproduction of money, thanks to managing deflation effectively.