Save path to my.ledger in ledger-file block.
Select gnuplot terminal. Using png to output images, but qt is handy too for interactive chart inspection.
Generate income report.
Generate expenses report.
Plot income vs expenses.
set terminal myterm size 3500,1500
set style data histogram
set style histogram clustered gap 1
set style fill transparent solid 0.4 noborder
set xtics nomirror scale 0 center
set ytics add ('' 0) scale 0
set border 1
set grid ytics
set title "Monthly Income and Expenses"
set ylabel "Amount"
plot income using 2:xticlabels(strftime('%b', strptime('%Y-%m-%d', strcol(1)))) title "Income" linecolor rgb "light-salmon", '' using 0:2:2 with labels left font "Courier,8" rotate by 15 offset -4,0.5 textcolor linestyle 0 notitle, expenses using 2 title "Expenses" linecolor rgb "light-green", '' using 0:2:2 with labels left font "Courier,8" rotate by 15 offset 0,0.5 textcolor linestyle 0 notitle