Your Earning Bonus is the percentage increase in the value of the eggs you harvest. Your current Earning Bonus can be found in Settings -> Prestige.
Earning Bonus is increased by collecting Soul Eggs and Eggs of Prophecy. Each Soul Egg increases your Earning Bonus by 10% - 150% cumulatively, depending on your Epic Research. This means that each additional Soul Egg adds to the total Earning Bonus. Thus, with zero Epic Research, 10 Soul Eggs would increase your Earning Bonus to 100% - for example. 100 Soul Eggs would give an Earning Bonus of 1,000%.
Each Egg of Prophecy increases your Soul Egg bonus by 5% - 10% compounding, depending on your Epic Research. This means that each additional Egg of Prophecy multiplies the total Earning Bonus. Thus, 10 Eggs of Prophecy (with no Epic Research) increase the Soul Egg bonus by 62% and 100 Eggs of Prophecy would increase the Soul Egg bonus by 13,050%.
Informally, Earning Bonus levels are often referred to by their "farmer level" as shown below:
| Earning Bonus | Farmer Level |
|---|---|
| 0% | Farmer 1 |
| 10% | Farmer 1 |
| 100% | Farmer 1 |
| 1K% | Farmer 2 |
| 10k% | Farmer 3 |
| 100k% | Kilofarmer 1 |
| 1M% | Kilofarmer 2 |
| 10M% | Kilofarmer 3 |
| 100M% | Megafarmer 1 |
| 1B% | Megafarmer 2 |
| 10B% | Megafarmer 3 |
| 100B% | Gigafarmer 1 |
| 1T% | Gigafarmer 2 |
| 10T% | Gigafarmer 3 |
| 100T% | Terafarmer 1 |
| 1q% | Terafarmer 2 |
| 10q% | Terafarmer 3 |
| 100q% | Petafarmer 1 |
| 1Q% | Petafarmer 2 |
| 10Q% | Petafarmer 3 |
| 100Q% | Exafarmer 1 |
| 1s% | Exafarmer 2 |
| 10s% | Exafarmer 3 |
| 100s% | Zettafarmer 1 |
| 1S% | Zettafarmer 2 |
| 10S% | Zettafarmer 3 |
| 100S% | Yottafarmer 1 |
| 1o% | Yottafarmer 2 |
| 10o% | Yottafarmer 3 |
| 100o% | Xennafarmer 1 |
| 1N% | Xennafarmer 2 |
| 10N% | Xennafarmer 3 |
| 100N% | Weccafarmer 1 |