W-2 Box 14 Codes, Decoded

The IRS General Instructions for Forms W-2 and W-3 describe Box 14 as the "Other" box: employers "may use this box for any other information" they want to give employees, with each item labeled however the employer sees fit. The only employers with a prescribed Box 14 requirement are railroads, which must report their retirement tax amounts there. For everyone else, it is a memo field.

That is why your Box 14 looks nothing like your spouse's or your coworker's at another company. One payroll system writes "CASDI," another writes "CA SDI," a third writes "SDI-CA." They all mean the same thing. The label is shorthand; what matters is what the underlying item is and whether it touches your federal or state return.

The mental model that keeps this simple: by the time a number reaches Box 14, its tax treatment already happened. Taxable items are already inside Box 1. Pre-tax items were already excluded. Box 14 is your employer showing its work, not assigning you new work. The exceptions, covered in their own sections below, are the entries that interact with a deduction, a state addback, or a credit that only YOU can claim on your return.

If the more basic question is how W-2 employment differs from contractor income in the first place, our W-2 vs 1099 guide covers that split.

If you own more than 2% of an S corporation that pays your health insurance, those premiums take a round trip through your W-2. The corporation deducts the premiums, adds the same amount to your Box 1 wages, and typically notes it in Box 14 with a label like "SCORP," "2% SH," or "S CORP HEALTH." The premiums land in Box 1 but stay out of Boxes 3 and 5, so no Social Security or Medicare tax applies when the plan is set up correctly.

Here is the part people miss: that Box 1 income is usually deductible right back on your personal return as the self-employed health insurance deduction on Schedule 1. The wage inclusion and the deduction are designed to offset. Skip the deduction and you pay income tax on money the rules never intended to tax. The Box 14 note exists precisely so your preparer can see the premium amount and claim it.

"414(h)" or "IRC414H" in Box 14 marks mandatory retirement contributions that a government employer "picked up" on your behalf. Federally they are pre-tax: the money never hit Box 1, and there is nothing to do on your federal return.

New York does not go along with that. If you are a member of one of the covered public retirement systems, including the New York State and Local Retirement Systems, the NYC Employees', Teachers', Police, and Fire pension funds, and the NYC Board of Education Retirement System, the 414(h) amount is an addition modification: it gets added back to income on Form IT-201 (residents) or IT-203 (nonresidents and part-year residents).

Skipping the addback understates New York income, and the state's matching systems see the Box 14 code on the W-2 your employer filed. This is one of the most common notices New York public employees receive, and it is entirely avoidable by entering the Box 14 amount where the software asks. The same page of state guidance covers the IRC125 addback for New York City employees with flexible benefits, which works the same way.

Mandatory contributions to a state disability fund, the "SDI" or "CASDI" on a California W-2, are treated as state income taxes. If you itemize deductions, they belong on Schedule A with the rest of your state and local taxes, subject to the SALT cap. If you take the standard deduction, the entry changes nothing, which is the case for most W-2 filers.

VPDI is the trap next door. It looks identical, a payroll deduction for California disability coverage, but it funds an employer-run voluntary plan instead of the state fund, and the IRS treats it as a nondeductible personal expense. Same paycheck, same purpose, opposite Schedule A answer. The three letters in Box 14 are the only way to tell them apart.

Paid family leave premiums follow the SDI logic. The IRS confirmed in Revenue Ruling 2025-4 that mandatory employee contributions to a state paid family leave program count as state income taxes, deductible on Schedule A for itemizers. That covers labels like NYPFL, WAPFML, MAPFML, and CTPL. New York specifically withholds PFL premiums from after-tax pay and reports them in Box 14, so the Schedule A deduction is the only tax benefit available for them.

New Jersey caps what employees contribute each year to unemployment insurance and the workforce funds (UI/WF/SWF), temporary disability insurance (DI), and family leave insurance (FLI). Each employer withholds up to the cap without knowing what your other employers withheld. Work two jobs, or switch jobs mid-year, and you can easily pay in more than the legal maximum.

The state gives that money back, but only if you claim it. If two or more employers combined withheld more than the annual maximum, you file Form NJ-2450 with your NJ-1040 to claim the excess as a credit. For 2025, the caps were $184.02 for UI/WF/SWF, $380.42 for disability insurance, and $545.82 for family leave insurance. The numbers come straight from the Box 14 (and sometimes Box 19) entries on each W-2, which is why keeping every W-2 matters.

When RSUs vest, the value of the shares is compensation. Your employer adds it to Box 1 wages, withholds on it, and often notes the amount in Box 14 as "RSU." So far, so ordinary: the income is already taxed, and the Box 14 entry looks informational.

The trap springs when you sell. Brokers are not permitted to include your compensation income in the cost basis they report on Form 1099-B for equity compensation shares, so the 1099-B typically shows a basis of zero or blank. File that number as-is and you report the entire sale price as capital gain, paying tax a second time on income your W-2 already taxed. The fix is a basis adjustment on Form 8949, using the broker's supplemental statement, and the Box 14 RSU figure is your cross-check that the adjustment is right.

If you have vesting schedules across multiple grants, our RSU tax calculator estimates the withholding gap before it becomes an April surprise, and our stock compensation planning services cover the ESPP and option layers that stack on top. The same basis logic applies to ESPP shares noted in Box 14: the compensation piece is already in Box 1, and the 1099-B basis usually omits it.

Most of the time, Box 14 deserves exactly the attention its placement suggests: not much. Union dues with no state deduction, fringe benefit memos, ESOP notes, tuition assistance under the exclusion cap, accountable-plan mileage: all of these were fully handled before the W-2 was printed. Entering them in your software's Box 14 screen and moving on is the correct amount of effort.

Hand it to a professional when you see any of these:

• RSU, ESPP, or any stock notation in a year you sold shares. The basis adjustment is easy to do and expensive to miss, and it is invisible if you do not know to look.
• S corp health insurance labels. The deduction depends on how the premiums were reported, and a wrong W-2 needs fixing at the payroll level.
• 414(h), IRC414H, or IRC125 if you file a New York return. Addbacks are cheap to get right and reliably noticed when you do not.
• Multiple W-2s in New Jersey or California, where excess disability or unemployment withholding turns into a credit only if someone claims it.
• Clergy housing amounts, which are excluded for income tax but still feed self-employment tax, a combination generic software workflows fumble.

The pattern: Box 14 goes from trivia to money whenever it intersects stock compensation, state addbacks, or a credit that has to be claimed. Tech employees hit the first category constantly, which is why our CPA services for tech employees treat the W-2, the 1099-B, and the broker supplemental statement as one document set instead of three.