Cash

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Cash (also called money, especially prior to Bloons TD 4) is the main currency in the Bloons TD series and some spinoffs when playing a map. It is primarily used to buy towers and upgrades. Cash can be obtained through various means, but is usually gained by popping Bloons.

Cash is usually notated with the dollar sign ($), though in Bloons TD Battles 2, it is sometimes represented by an icon with a cent sign (¢).

Sources of cash

Starting cash

Starting cash is the amount of cash a player starts a game with. In most Bloons TD games, the player starts with $650, though some game modes alter this. In Bloons Monkey City, the player starts with $350, which increases by $100 per City Level gained, up to a maximum of $4,250.

Depending on the game, starting cash can be increased by some methods. In the multiplatform version and console version of Bloons TD 5, starting cash can be increased with the Monkey Lab to up to $1,050. In Bloons Monkey City, starting cash can be increased by an additional $250 with the Magic Coin Purse and Epic Magic Coin Purse. In Bloons TD 6, starting cash can be increased with the More Cash Monkey Knowledge. In Bloons Adventure Time TD, starting cash increases by $5 per rank, to up to $1,125 at rank 100.

Cash per pop

In most games other than Bloons TD Battles and Bloons TD Battles 2, each layer of Bloon popped grants the player cash. This amount typically starts at $1 per layer, but starting in Bloons Tower Defense 3 Bloons popped in later rounds may grant less cash than usual.

Some towers and Heroes can also grant the player extra cash from popping Bloons; prior to Bloons TD 6 this is limited to the Monkey Town and Bloon Trap upgrades, but Bloons TD 6 also contains several other examples including the Pirate Lord's MOAB Takedown ability, the Bounty Hunter's Marked to Pop ability, and the Alchemist's Lead to Gold and Rubber to Gold upgrades. Lastly, Obyn Greenfoot's Wall of Trees ability can grant extra cash, functioning very similar to Bloon Traps. Benjamin's Bloon Trojan and Syphon Funding abilities can also grant extra cash, though these can instead lose cash if not used carefully.

End-of-round cash

In most games other than Bloons TD Battles and Bloons TD Battles 2, players earn cash at the end of every round. In Bloons Tower Defense and Bloons Tower Defense 2, this amount starts at $100 and decreases by 1 every round; in Bloons Tower Defense 3 and later, it starts at $101 and increases by 1 every round.

Income

In Bloons TD Battles and Bloons TD Battles 2, cash is not normally gained by popping Bloons or at the end of each round. Instead, cash is gained at fixed intervals based on the player's income, which can be modified by using Bloon sends.

Selling

Towers can be sold to return a portion of the total amount of cash spent on them. In Bloons TD 6, the Flash version of Bloons TD Battles, Bloons TD Battles 2, and Bloons Adventure Time TD, selling returns 70% of the total cash spent on a tower, while in all other games, selling returns 80%. Depending on the game, the sellback rate of towers can be increased with certain game mechanics, such as Monkey Knowledge in Bloons Monkey City or Monkey Tycoon in Bloons TD 4. The Rare Quincy Action Figure item sold by Geraldo can also effectively make money for the player by passively increasing its sellback value at the end of each round.

Cash generation of towers by game

In Bloons TD 5

Tower	Upgrades	Income
Banana Farm
Sniper Monkey	Supply Drop	$500 to $1500 per crate, 60 seconds cooldown
Monkey Village	Monkey Town	+50% cash per pop
Heli Pilot	Support Chinook	$1500 to $2000 per crate, 60 seconds cooldown

In Bloons TD Battles

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In Bloons Monkey City

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In Bloons TD 6

Tower	Upgrades	Income
Banana Farm	See the Banana Farm article's cash generation section for details
Desperado	Bounty Hunter and Golden Justice	2× cash per marked bloon pop
Desperado	Nomad	2× cash value of Bloons that leak
Sniper Monkey	Supply Drop	$1,100 per crate, 90 seconds cooldown, max 3 per round
Sniper Monkey	Elite Sniper	$3,000 per crate, 90 seconds cooldown, max 3 per round
Monkey Buccaneer	Pirate Lord	2× cash per blimp hooked
	Merchantman	$200 at the end of round, +10% cash production per Central Market (up to +100%)
	Favored Trades	$500 at the end of round ($520 with Trade Agreements), increases towers within range sell value by 4% stacking up to 3 times for a maximum of 12%
	Trade Empire	$800 at the end of round ($820 with Trade Agreements), buff the income of up to 20 other Merchantmen (+$10) or Favored Trades (+$20) for each buffed towers
	Navarch of the Seas	$3200 at the end of round, buff the income of up to 40 other Merchantmen (+$10) or Favored Trades (+$20) for each buffed towers
Heli Pilot	Support Chinook	$1,550 per crate ($1,938 with Charged Chinooks), 90 seconds cooldown, max 2 per round
Heli Pilot	Special Poperations	$4,500 per crate ($5,625 with Charged Chinooks), 90 seconds cooldown, max 2 per round
Super Monkey	See the Temple Sacrifices article for details of Sun Temple support sacrifice
Alchemist	Lead to Gold	Generate $50 per Lead bloon popped
Alchemist	Rubber to Gold	2× cash per bloon affected pop
Druid	Jungle's Bounty	$120 plus extra cash per Banana Farm and its upgrades within range at end of round
	Spirit of the Forest	$1120 plus extra cash per Banana Farm and its upgrades within range at end of round
	Root of all Nature	$240 plus extra cash per Banana Farm and its upgrades on the map at end of round or when BAD is popped or when boss skull is defeated (max $10,000)
Engineer Monkey	Bloon Trap and XXXL Trap	2× cash per bloon caught in trap
Monkey Village	Monkey Town	+50% cash per pop (60% with Inland Revenue Streams).
	Monkey City	+20% cash from all income sources.
	Monkeyopolis	Generates $1,000 per round +$200 per $2,000 value of Banana Farms in radius.
Obyn Greenfoot	+50% income for Druids in range (level 5+) 2× cash per bloon caught in Wall of Trees
Benjamin	Income per round: $90 per bloon (level 1+), $140 per bloon (level 2+), $250 per bloon (level 8+), $1000 per bloon (level 11+), $2500 per bloon (level 15+), $5000 per bloon (level 17+) Bank Hack: +5% income (level 5+), +12% income (level 9+) for Monkey Banks Skimming: $1 per bloon (level 6+), $2 per bloon (level 12+)
Geraldo	Rare Quincy Action Figure: Gain sell value at the end of the round Fertilizer: +20% income for Banana Farms for 4 rounds
Corvus	Nourishment: $0.5 per bloon (level 1+), $2 per bloon (level 15+), $8 per bloon (level 20+)