Do you have several months in a row showing overtime hours? The only time a lender verified my income was when they asked for several months of pay stubs. I would find the average of your last 3 months then x12 and put that as your income. I would not include a Bonus as part of the income.
Just an FYI, the lender that did verify ended up NOT including my overtime hours. I still got the loan and it wasn't like I was trying to do anything illegal on the loan application. I would still give the best estimate of your actual income and go from there.
Oh yes, I've had overtime, or "extra" (which is what we get when you have more than 40 hours on a week, but also vacation or holiday pay) every single pay since last August.