what do you mean by nothing fancy? but here are some thoughts. if your salaries haven't changed much in 2020 , take the cumulative withholding from the latest paystubs and add to that the withholding that will be taken out for the rest of the year and compare it to your 2019 tax liabilty. if it's close I would do nothing. if your going to owe then 1) is the higher paying job claiming Zero exemptions? 2) your spouse could claim Zero.
3) do you get bonuses - if so, is the withholding on them less than your effective tax rate. - if so ask that more be withheld. 4) do your paychecks differ radically from pay period to pay period. - if so the withholding for the larger paychecks may not compensate to offset the lower withholding on the smaller paychecks - in that case you may want extra $ withheld each period. 5) each pay period put some of the money into an account (fee free) that you will only use to pay any balance due - your own withholding.
also owing is not the worse thing provided there are no penalties and you can afford to pay. you either pay with each paycheck or pay on 4/15.
