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

Cash icon in BTD6

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 generation is halved during Half Cash Mode. All income excluding cash per pop income is disabled in C.H.I.M.P.S. Mode.

Money has a "maximum limit", that amount depending on the type of game it is played on. Bloons TD 4 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. All other games have an arbitrarily high cap, usually the 32-bit integer maximum.

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 Bloons TD 6, a Monkey Knowledge Point called More Cash increases the player's starting cash by 200, and Double Cash doubles that amount.

Obtaining Money

There are five ways you can get money:

• The first way is by popping Bloons:

Type	BTD	BTD2	BTD3	BTD4	BTD5	BMC	BTD6
Red Bloons	1	1	1	1	1	1	1
Blue Bloons	2	2	2	2	2	2	2
Green Bloons	3	3	3	3	3	3	3
Yellow Bloons	4	4	4	4	4	4	4
Pink Bloons	N/A	N/A	N/A	5	5	5	5
Black Bloons	9	9	9	11	11 (6)	11 (6)	11 (6)
White Bloons	9	9	9	11	11 (6)	11 (6)	11 (6)
Purple Bloons	N/A	N/A	N/A	N/A	N/A	N/A	11 (6)
Camo Bloons (BTD4)	N/A	N/A	N/A	11	N/A	N/A	N/A
Lead Bloons	N/A	19	19	23	23 (7)	23 (7)	23 (7)
Zebra Bloons	N/A	N/A	N/A	23	23 (7)	23 (7)	23 (7)
Rainbow Bloons	N/A	37	37	47	47 (8)	47 (8)	47 (8)
Ceramic Bloons	N/A	N/A	73	92	95	95	95
M.O.A.B.	N/A	N/A	292	302	381	381	381
B.F.B.	N/A	N/A	N/A	1525	1525	1525	1525
Z.O.M.G.	N/A	N/A	N/A	N/A	6101	6101	6101
D.D.T.	N/A	N/A	N/A	N/A	N/A	571	381
B.A.D.	N/A	N/A	N/A	N/A	N/A	N/A	13346

• During Freeplay Mode in BTD5 and BTD6, 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).

• The second way is by 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 Farm which has either 1^(BTD4), 2^(BTD5),(BMC), or 3^{(BTD6),(BTDB2)} very different ways of providing money each round.
  • The COBRA's Wired Funds upgrade in BTDB.
  • The Engineer's Bloon Trap and XXXL Trap.
  • Support Chinook and Special Poperations Special Ability for the Heli Pilot.
  • Supply Drop and Elite Sniper Special Ability for the Sniper Monkey.
  • Sun Temple, True Sun God, and Vengeful True Sun God with support tower sacrifice upgrade for the Super Monkey in BTD6.
  • Merchantman, Favored Trades, Trade Empire, Monkey Pirates, Pirate Lord, and Navarch of the Seas 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.
  • Obyn Greenfoot's Wall of Trees ability.
  • Geraldo's Rare Quincy Action Figure item.
• The fourth way is by using tower upgrades or heroes that gives bonus Bloon and tower income:
  • Bloons that get popped by towers within the range of a Monkey Town give you 50% (60% with Inland Revenue Streams MK) more cash than normal.
  • Almost all towers and Heroes that generate income within the range of a Monkey City gets 15% more cash than normal.
  • Lead Bloons affected by Lead to Gold give $50. This doesn't affect DDTs.
  • Bloons affected by Rubber to Gold has triple the income.
  • Benjamin's upgrades:
    • "Bank Hack" makes all Monkey Banks and its upgrades earn 5% more income on level 5, and 12% more income on level 12.
    • "Bloon Trojan" is sent every few seconds and affects Bloons. Affected Bloons spawns no children when destroyed and produces 1 extra cash for every layer. Bloon Trojan is upgraded at level 16.
    • "Syphon Funding" downgrades most newly spawn Bloons by 1 rank and gives double cash per pop. Lasts for 10 seconds. On level 20, it lasts for 20 seconds and gives triple cash per pop.
  • Geraldo's Fertilizer which only affects Banana Farms. (Doesn't affect Monkey Banks and Marketplaces).
• The fifth way is by using Powers:
  • By purchasing a Cash Injection with Monkey Money in BTD4, BTD5, and BTDB which gives 10,000 money, or purchasing and using a Cash Drop power in BTD6 which gives 2500 money.
  • The BTD6 Thrive power increases the income by 25% (30% with Supa-Thrive MK) for the current and the next round in which it's used.
  • The Double Cash mode which doubles cash per pop and starting cash.

Income Multipliers

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

BTD5

• 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+

BTD6

• 100% in rounds 1-50
• 50% in rounds 51-60
• 20% in rounds 61-85
• 10% in rounds 86-100
• 5% in rounds 101-120
• 2% in rounds 121+

BATTD (Normal Play)

• 100% in rounds 1-32
• 50% in rounds 33-47
• 20% in rounds 48-64
• 10% in rounds 65-75

BATTD (Martian Games)

• 100% in rounds 1-13
• 70% in rounds 14-17
• 50% in rounds 18-21
• 20% in rounds 22-24
• 5% in rounds 25+

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)

The highest tier's (Tier 9) contested territory in BMC uses regular Normal Mode formula. This also applies when you play Medium Difficulty via Replay Tracks on level 40.

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

Standard Rounds

Round	Money awarded
	Max. for popping bloons	Total	Cumulative
1	20	121	121
2	35	137	258
3	35	138	396
4	71	175	571
5	59	164	735
6	57	163	898
7	75	182	1080
8	92	200	1280
9	90	199	1479
10	204	314	1793
11	78	189	1982
12	80	192	2174
13	169	282	2456
14	145	259	2715
15	151	266	2981
16	152	268	3249
17	48	165	3414
18	240	358	3772
19	141	260	4032
20	66	186	4218
21	230	351	4569
22	176	298	4867
23	154	277	5144
24	43	167	5311
25	210	335	5646
26	207	333	5979
27	535	662	6641
28	138	266	6907
29	260	389	7296
30	207	337	7633
31	406	537	8170
32	495	627	8797
33	72	205	9002
34	778	912	9914
35	1015	1150	11064
36	760	896	11960
37	1202	1339	13299
38	1139	1277	14576
39	1620	1759	16335
40	381	521	16856
41	2040	2181	19037
42	517	659	19696
43	1135	1278	20974
44	1150	1294	22268
45	2277	2422	24690
46	570	716	25406
47	1490	1637	27043
48	2695	2843	29886
49	4609	4758	34644
50	2866	3016	37660
51	947	1098	38758
52	1444	1596	40354
53	771	924	41278
54	2044	2198	43476
55	2328	2483	45959
56	1130	1286	47245
57	1702	1859	49104
58	2140	2298	51402
59	2000	2159	53561
60	763	923	54484
61	1071	1232	55716
62	1225	1387	57102
63	2663	2826	59928
64	686	850	60778
65	2906	3071	63849
66	838	1004	64854
67	856	1024	65877
68	609	778	66655
69	1222	1391	68046
70	2449	2619	70665
71	1332	1503	72168
72	1332	1504	73672
73	1220	1392	75064
74	2870	3044	78108
75	2493	2668	80776
76	1140	1316	82092
77	2363	2540	84632
78	4684	4862	89494
79	6530	6709	96203
80	1220	1400	97603
81	5185	5366	102969
82	4575	4757	107726
83	4566	4749	112475
84	6860	7044	119519
85	2441	2626	122145
86	762	948	123093
87	2440	2627	125720
88	3126	3314	129034
89	1982	2171	131205
90	149	339	131545
91	4000	4191	135736
92	4345	4537	140273
93	1754	1947	142220
94	7473	7667	149887
95	3523	3718	153605
96	9759	9955	163560
97	1221	1418	164978
98	9455	9653	174631
99	2629	2828	177459
100	1335	1535	178994
101	225	426	179420
102	899	1101	180521
103	2386	2589	183110
104	2764	2968	186078
105	1678	1883	187961
106	708	914	188875
107	1463	1670	190545
108	2074	2282	192827
109	2975	3184	196011
110	991	1201	197212
111	3172	3383	200595
112	747	959	201554
113	845	1058	202612
114	2157	2371	204983
115	2157	2372	207355
116	1573	1789	209144
117	377	594	209738
118	1448	1666	211404
119	533	752	212156
120	1342	1562	213718
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141-162	Random	Random	Random
163	Random	Random
164-199	Random	Random
200	533	833
201-262	Random	Random
263	Random	Random
264-9,999	Random	Random
10,000	9290000	36792
10,001	18998	29099
10,002	762	10864
10,003	3050	13153
10,004	12202	22306
10,005	762	10867
10,006+	26692	Depends

Alternate Bloons Rounds

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 $178,994 between rounds 6-100. Therefore, it is impossible to purchase True Sun God, Legend of the Night, and Paragons due to their total upgrade costs exceeding the money available. While Super Mines is affordable as of update 35, doing so in practice is extremely difficult due to its previous upgrade, Spiked Mines, being unable to survive long enough on its own to get the required money.
• 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.