How is my unused PTO and final bonus taxed?

What happens to all the money your employer still owes you when you walk out the door? It lands on your tax return, often all at once, and that timing is the whole game. A payout for unused vacation, a final bonus, vesting equity, deferred compensation: in your last working year these can stack into a single spike of income right when you’d rather your income be falling.

What’s typically owed

The final check is rarely just your last two weeks of salary. Depending on your employer and your state, it can include:

• Accrued but unused PTO, paid out as a lump sum.
• A final or prorated bonus.
• Vesting RSUs or exercised stock options.
• The first installment of any deferred compensation.

Each one is ordinary income. Stacked together in one year, they can push your last paycheck into a higher bracket than your salary ever reached.

The timing lever

If you have any say over when this money pays out, that’s where the planning lives. A bonus or PTO payout that lands in January instead of December moves the income into a year when you may have no salary at all. Deferred comp is the bigger lever, because the payout schedule you elected years ago decides whether it arrives as one tax bomb or a smooth stream. Most people set that election and forget it. The choice was always second- and third-order: a lump sum is simple, but a multi-year payout can keep you out of the top bracket and below the surcharge lines.

The hidden price two years out

Here’s the part that surprises people. A big final-comp year doesn’t just raise this year’s tax. Because Medicare uses a two-year income lookback, the income you report the year you retire sets your IRMAA surcharge, the income-based add-on to your Medicare premiums, two years later. Retire at 63 with a fat final year and you can be paying higher Medicare premiums at 65 for a paycheck you’ve long since spent. See IRMAA Two-Year Lookback Planning for how to see it coming.

For higher-net-worth households

Coordinate the final-comp year with everything else you control. If this is already a high-income year you can’t avoid, it’s the wrong year to also stack Roth conversions on top. If you can push the big payouts into the following low-income year, you free up bracket space for conversions before RMDs begin. The last paycheck isn’t just a goodbye. It’s the opening move of your retirement tax plan, so play it on purpose.