How much of my season bank loot will attackers get when they raid my village?

[Cleofas]

After getting the season bank reward, my gold and elixir storages will be at 25,000,000.

I can't spend this that quickly so assuming my storages stay that way when I get attacked, will the attacker be able to gain a portion of my bonus, walking away with massive loot gains, or is the amount they can take capped somehow?

[rosemadder]

According to https://clashofclans.fandom.com/wiki/Multiplayer_Battles :

The percentage of Gold/Elixir that can be stolen from storages until TH6 is 20% and is capped at 200,000. At TH7 and up, the percentage that can be stolen drops by 2% at each TH level, to a minimum of 10% at TH11 and above, while the cap increases by 50k at each TH level, to a maximum of 600,000 at TH14.

Here's a chart:

Town Hall Level	% Available to be Stolen	Cap	Storage Amount to Reach Cap
1	20%	500	2,500
2	20%	1,700	8,500
3	20%	20,000	100,000
4	20%	100,000	500,000
5-6	20%	200,000	1,000,000
7	18%	250,000	1,388,889
8	16%	300,000	1,875,000
9	14%	350,000	2,500,000
10	12%	400,000	3,333,333
11	10%	450,000	4,500,000
12	10%	500,000	5,000,000
13	10%	550,000	5,500,000
14	10%	600,000	6,000,000

The amount of stolen loot varies depending on the defender’s and also attacker’s Town Hall levels and how much loot the defender has in storage.

Luckily, there's a https://pixelcrux.com/Clash_of_Clans/Available_Loot/Calculator that should answer your question. And since I don't have all the needed info, you may want to try by yourself.