This is only available to those who go prestige. Read more about Prestige here.
Once you go prestige, you'll lose all your gold. This gold is stored in PRs Hefty Retirement Fund. Once you reach Rank 45 again, after going prestige, you'll receive back all of your gold +10% interest.
For example, if you had 10,000$ and go prestige, you'll lose everything and your rank will be resetted to Rank 0. Once you've ranked up to rank 45 you'll receive a bonus of 11,000$ (as 10% of 10,000$ is 1,000$ so 1,000+10,000 is 11,000$).
- This was only implemented after people disliked PlaceRebuilder removing all their cash accumulated over years.