Liabilities:Estate:Advances -$100
Assets:Loans:Advances-to-Estate $100
Assets:Checking:MyBank
2023-07-28 Purchase on behalf of Estate
Expenses:Estate:Utilities:Electricity $75
Liabilities:Estate:Advances -$75
Assets:Loans:Advances-to-Estate $75
Assets:Checking:MyBank
and then your balance looks like:
$100 Assets
$-175 Checking:MyBank
$100 Estate:Checking:MyBank
$175 Loans:Advances-to-Estate
$75 Expenses:Estate:Utilities:Electricity
$-175 Liabilities:Estate:Advances
So you have -$175 in your account (I started with a zero balance); the estate account has $100 in it (again, zero starting balance), but you're entitled to $175 back from the estate (Assets:Loans:Advances-to-Estate) and the estate has an account showing what it owes back to you (Liabilities:Estate:Advances).
You can then pay yourself back with a transaction like:
2023-07-28 Reimburse Pete
Assets:Estate:Checking:MyBank -$100
Liabilities:Estate:Advances $100
Assets:Loans:Advances-to-Estate -$100
Assets:Checking:MyBank ; implicitly +$100
In my experience estates tend to be separate accounting entities from your personal accounts, so I would even consider structuring those accounts as Estate:Assets:Checking:MyBank, Estate:Liabilities:Advances-to-Pete etc, just to make the distinction super obvious.
mjec