Bank Deposits

 is one of the last Support Monkey Knowledge points in Bloons TD 6, added in Version 18.0. When enabled, a button will appear on the IMF Loan or Monkey-Nomics screen that allow the player to deposit money into the bank directly. It requires 14 support knowledge points invested, Better Sell Deals, and it has a one-time purchase of 1,000.

Depositing
The deposit button allows the bank to receive cash directly from the available in game cash, all cash will be deposited, but it is limited to 50% of the remaining bank storage. However, the bank contains two hidden storage spaces (the player can only see the sum of both), one space receives the end of round interest bonus, but the other does not (deposits are done in here), therefore, deposits will only be considered for the end of round bonus the second time the bonus is applied.

Income tables
The following tables consider that a single maximum deposit was done while the bank was empty. "Total cash" is the value at the end of a full round. Values are rounded.

Summary
Even though manual deposits only register for interest after one round of collection and such privilege is limited to IMF Loans, Bank Deposits are quite strong for what they offer. Its main power comes from accumulating an already solid income strategy and using that cash to receive short-term interest on top of the IMF Loan's original benefits. Chunks of income can be pushed into each IMF Loan to eventually profit a solid amount, and also IMF Loan offers a loaning option for even more income to be used for other methods. All of this together makes for a solid competitor to Banana Research Facilities by encouraging penny-pinching income generation strategies in exchange for swapping hover-based micro with tapping-based micro.

Tips

 * It may be useful to use an already existing near-full Monkey Bank, emptying it, and then upgrading it to IMF Loan to kickstart the Bank Deposits benefit.
 * Do not withdraw manual deposits too soon. Anticipate for difficult rounds, and stay on the safe side if not defensely confident for upcoming rounds.
 * It may be helpful to use a 0-4-2 IMF Loan instead of a 2-4-0 IMF Loan to make it easier to micro multiple IMF Loans with the manual deposits.
 * Make sure any manual deposit does not cause an IMF Loan's bank storage to exceed ~$9,900. Too much and the deposit would overflow, wasting investment. Also take into account any previous income that was collected from the current IMF Loan; this alters how the manual deposit will impact the currently stored income, positively or negatively.
 * Try to artificially split manual deposits evenly into each IMF Loan to even out extrapolative income potential. Buy other towers, preferably income generators such as ordinary Monkey Banks, to offset the amount of money deposited into IMF Loans.

Trivia

 * Since this Monkey Knowledge can only be purchased after acquiring the Backroom Deals, and consequently also Bigger Banks, knowledge, it is impossible to use this Monkey Knowledge on banks with their normal maximum capacity values.
 * As of Version 18.0, it is the only Support MK to require 14 MK Points invested and also the only of its kind to require 1,000 as the one-off purchase.
 * Prior to Version 19.0 nerfs, it was found that 86.96% of the whole capacity would theoretically be required for the optimum bank balance profits, although three uses of the deposit function would be sufficient enough income production for most practical situations.
 * Prior to Version 19.0, triple deposits were able to be more efficient than double deposit in terms of mathematical efficiency for Monkey Banks, but this was only assuming all pockets of cash per round are collected. However, practically speaking, double deposit was still more useful overall, especially when there were a huge number of Banks on screen. In fact, not collecting all pockets of cash per round and leaving the deposits running would generate more cash than collecting all pockets of cash per round and triple depositing, which in turn was at the time more income-over-time efficient. On Half Cash, this efficiency trend still remained the same.
 * Also prior to Version 19.0, triple depositing any Bank would earn up to an additional $1,368 profit could be earned per round if the Bank fully reached the bank balance after the round ends with the triple deposit amount left, and likewise an additional $1562 profit for IMF Loans.
 * Prior to Version 19.0, the compounding benefits of Bank Deposits were so money-efficient that it would take only 6.667 rounds to pay off deposits per dollar invested into any Monkey Bank, not including overshooting bank capacity (which would obviously make it less income efficient). This was due to the direct +15% interest onto investments via Bank Deposits added after the end of each round.