If you have a repayment agreement with the IRS, it’s a contract. As long as you are making the agreed payments, the probably can’t take it without going to court first.
You could also set up a new checking account at another bank and deposit the money there. The irs has more important things to do than checking your finances on a regular basis.
Keep up to date with the payment plan and don’t worry.
I’ll take your suggestion for the time being. Just deposit most of it into another bank. This will do for right now.
At least I won’t have all my eggs in one single basket.