Need to find first empty row to add information...

I've attached an example of a spreadsheet to keep track of my finances. It's only an example of what I want to do so there isn't any formula's built in. Part of the spreadsheet is an area where all my bills are lined in a column by name, date, amount due, and a check box that shows it's paid. Another section of the spreadsheet is a ledger that keeps track of what I have in my account. If you could look at the spreadsheet, when I pay my car insurance and check it off, cell K25, I want the info from H25, I25, and J25 to automatically populate A12, B12, and C12. So it would have to know that A12 is the next empty cell. Thanks for any help...

Maybe:

Private Sub Worksheet_Change(ByVal Target As Range)

If Not Intersect(Target, Range("K2:K100")) Is Nothing Then

    If Target.Value = "X" Then
    
        Range(Target.Offset(, -3), Target.Offset(, -1)).Copy Range("A" & Rows.Count).End(3)(2)
    End If
    
End If

End Sub

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