We pay bonuses at year-end. What do I need to know before running a bonus payroll?

The biggest thing to know is that year-end bonus payrolls need planning time. Waiting until the last week of December creates unnecessary stress and risk. Banks have limited hours around the holidays, payroll systems need processing time, and a missed deadline means the bonus might not count in this year’s W-2 totals. Start the conversation with your payroll provider or bookkeeper early in December.

Bonuses are classified as supplemental wages, which means withholding works differently than regular pay. Many employers use the flat rate method, which applies a set federal withholding percentage to the bonus amount. The aggregate method combines the bonus with regular wages and calculates withholding as if that larger amount were a normal paycheck. Either way, the withholding percentage on a bonus often looks higher to employees than what they see on regular paychecks. This is normal and expected. State withholding rules vary, so the specifics depend on where your employees work.

A large bonus run can also change your tax deposit deadline. Federal payroll tax deposits follow a schedule based on your total tax liability over a lookback period. Most small employers deposit monthly or semi-weekly. But if a single payroll accumulates $100,000 or more in total tax liability, the deposit becomes due the next business day. A generous bonus cycle that crosses that threshold accelerates when the money needs to move. Your payroll system should handle this, but you need enough cash in the account to cover the deposit on short notice.

For the bonus to appear on this year’s W-2, the payment date must fall in the current calendar year. If you run payroll on December 28 with a check date of January 2, those wages belong to next year. Full-service payroll providers handle this timing, but you need to initiate the run with enough lead time for the funds to reach employees before December 31.

At ClearLedgers®, bonus runs are processed as part of your regular payroll service with sufficient notice. Changes to payroll data, including bonus amounts by employee, should come in at least five business days before the check date. For December, that means getting the details finalized in mid-month rather than scrambling on December 22.

Before you run the bonus payroll, have a clear list of who receives a bonus and how much. Decide whether bonuses are separate payments or combined with regular wages on the same check. Confirm the check date falls in the correct calendar year. And verify that your bank account will have the funds to cover both the net pay and the associated tax deposit.

Year-end bonuses are a good thing. They reward your team and they are deductible business expenses. The key is treating them as a planned payroll event rather than a last-minute scramble. If you need help running small business bookkeeping and payroll so December stays calm, book a consultation and let’s talk through your timeline.