What Is SIT or SWT on a Pay Stub? State Withholding Tax Explained
State-tax and W-2 references checked November 12, 2026 About our editorial team
What does SIT withheld mean on a paycheck? It usually means state income tax withholding—money your employer takes from the current paycheck and pays toward applicable state income tax. SWT commonly means state withholding tax, and SITW means state income tax withholding. The Current amount reduces this paycheck; YTD is the accumulated total, not a second deduction. Confirm the state code and employee-tax line before deciding whether an amount is correct.
The letters tell you the type of payroll entry, not whether its amount is correct. For an unfamiliar state code, check your work and residence states, state-taxable wages, and withholding election before assuming it is an error.
What Does SIT Withheld Mean on a Paycheck?
When SIT withheld appears under employee taxes with a current dollar amount, it normally reduces the take-home pay from that paycheck. It is a payment toward the relevant state's income tax, not a new fee or a separate tax on top of state income tax.
Example: If a stub lists Current SIT $75 and SIT YTD $1,100, only the $75 is withheld on this paycheck; the $1,100 includes earlier checks. The example is illustrative, not a state withholding-rate calculation.
Before deciding the deduction is too high, confirm the state shown, the state-taxable wage amount, any extra state withholding requested, and whether you worked or lived in more than one state.
| Employee taxes | Current paycheck | Year to date |
|---|---|---|
| Federal income tax | −$210.00 | $3,080.00 |
| NY SIT — state income tax | −$75.00 | $1,100.00 |
State Withholding Code Decoder
Select the exact label you see. This helps identify its likely category; it does not calculate a tax rate or certify whether a deduction is lawful for your circumstances.
What Is SITW on a Paycheck? SWT vs. SIT Explained
SWT typically means state withholding tax; on a wage-statement tax line it commonly refers to state income tax. SITW usually expands to state income tax withholding. You may also see ST, State W/H, or a two-letter state code alongside these labels. A payroll-provider change can rename a deduction without changing the underlying tax. SIT withheld identifies the employee state-tax deduction, while SITW describes the same general withholding category in many payroll systems. Not all employers use these labels consistently, so verify the pay-stub section and the state abbreviation when the label is unfamiliar.
SITW on your pay stub: state income tax withholding. SWT on your pay stub: commonly state withholding tax. SIT withheld: the state income tax amount actually taken from that check when shown under employee taxes. These are common payroll conventions—not universal provider codes.
SWT is not a catch-all for every state-related deduction. For example, California state disability insurance (CASDI), state unemployment insurance (SUI), and local wage tax are different from ordinary state income tax. Do not add those lines to your SIT amount merely because they include the word "state."
How to Read SIT Withheld: Current Amount, State Code and YTD
- Locate the tax line: look under employee taxes or deductions for SIT, SWT, SITW, or a state-prefixed code.
- Read the jurisdiction: check whether the entry says NY, CA, MO, a residence-state code, or a work-state code.
- Read the correct column: Current is the withholding from this check; YTD accumulates withholding recorded during the payroll year. Do not subtract YTD again from net pay.
- Check the payroll wage base: state-taxable wages may differ from gross earnings and from federal taxable wages.
- Compare the previous check: if withholding changed, review wages, supplemental pay, state elections, assigned work location and any payroll corrections.
Current SIT vs. SIT YTD
Current SIT is tax actually withheld on this pay statement. SIT YTD is the running total for the relevant year through its pay date. For a single state with no correction, the previous YTD plus this paycheck's current tax should equal the new YTD: $1,026 + $74 = $1,100. A reversal, refund, off-cycle run or payroll adjustment may change that simple relationship. For more, see Current vs. YTD on a pay stub.
- Which state? Check the state shown on the tax line and confirm it matches your payroll records.
- Which amount? Compare the Current amount on two checks; YTD is not another deduction.
- Which taxable wages and election? State-taxable wages and state withholding elections can differ from gross pay and the federal Form W-4.
SIT Paycheck Audit: Why Did Your State Withholding Change?
Use this four-step comparison if the state tax on one paycheck looks different from the previous one. It compares what payroll recorded; it does not calculate your legally correct state income tax, prove an employer made an error, or replace state-specific withholding instructions.
- Identify the label and state: SIT, SWT, SITW, RES SIT or WORK SIT; confirm it is an employee deduction rather than an employer-only or informational amount.
- Compare the same tax line on two paychecks: enter the previous and current amounts. State-taxable wages are optional if the pay stub does not show them.
- Read the comparison: find out what changed, what the figures cannot prove, and which payroll setting or adjustment might explain it.
- Ask payroll a precise question: use the prepared inquiry and compare the state withholding election, payroll jurisdiction and any corrections.
Compare two paychecks
Use amounts for the same employee, employer and tax type. If you moved between states or changed pay frequency, the comparison may not be directly comparable. Do not enter a name, Social Security number, employee ID or other identifying information.
Use a two-letter state abbreviation, or leave blank if not shown.
Enter nonnegative amounts with up to two decimal places (for example, 1200.00 or $1,200.00). Leave both taxable-wages fields blank if that figure is unavailable. This tool handles ordinary nonnegative deductions; if you see a negative/refund tax adjustment, ask payroll to identify the correction.
This comparison runs in your browser; this feature does not submit your entered numbers to a server. Regular site analytics and privacy practices may still apply. Clear your entries on a shared device when you are finished.
| Pay-stub field | Previous paycheck | Current paycheck |
|---|---|---|
| Gross wages | $3,000.00 | $3,000.00 |
| State-taxable wages | $2,800.00 | $2,800.00 |
| SIT withheld | $90.00 | $120.00 |
| Observed withholding ÷ state-taxable wages | 3.21% | 4.29% |
The deduction increased by $30.00 despite unchanged reported state-taxable wages. The observed percentage increased by about 1.07 percentage points. This is not proof that the state's tax rate changed or that either deduction is wrong. Ask whether an additional withholding election, payroll location, state-specific setting, or correction changed.
How to Check or Change State Income Tax Withholding
If the SIT amount seems wrong, first ask payroll which state, taxable wages, pay frequency, and withholding election the employer used. A changed deduction does not necessarily mean your state tax rate changed. If you want a different amount withheld going forward, check the state-specific employee withholding form rather than assuming a federal Form W-4 updates every state election. For a separate estimate, compare the applicable official state withholding tables with the relevant ePaystubs California paycheck calculator or Arizona paycheck calculator. A calculator estimate does not replace the employer’s payroll records or an official withholding election.
- Check the deduction: confirm SIT is an employee tax line in the Current column; compare your state-taxable wages and recent paychecks.
- Confirm your work and residence information: make sure payroll has the correct state details and any extra withholding or exemption request.
- Find the official state election: for example, New York publishes its 2026 Form IT-2104; California uses Form DE 4 for state income-tax withholding. These are examples, not universal forms.
- Submit changes through your employer's approved payroll process: ask when they take effect and check the next pay statement. For a disputed past deduction or possible wrong-state withholding, request a payroll review or correction, rather than treating an election change as proof of error.
RES SIT vs. WORK SIT: What If You Live and Work in Different States?
RES SIT or RES. SIT generally refers to the resident-state income-tax calculation in payroll systems that distinguish an employee's home and work locations. WORK SIT generally refers to the work-state calculation. These are payroll labels, not nationwide statutory names. Some systems display one line, both lines, or a differently named tax for the same situation.
| Code | What it often tracks | What you should verify |
|---|---|---|
| RES SIT | Resident-state withholding | Your address, residence state and state withholding election |
| WORK SIT | Work-state withholding | Assigned or physical work location and work-state wage sourcing |
| Both | Separate jurisdiction calculations | Whether either line is only informational, whether both are actually deducted, and applicable reciprocity or resident-credit rules |
Quick distinction: RES SIT generally points to your residence state; WORK SIT generally points to your work state. If both appear, check whether both are real employee deductions, and ask payroll which state rules and exemptions were applied.
Example: You live in one state and physically work in another. Payroll may report a work-state tax and a residence-state tax. That alone does not prove an error or automatically mean both states will ultimately tax the same income without relief. Some state pairs have reciprocity agreements; some residents can claim a credit for qualifying tax paid to another state. The rules depend on the exact states, the source of wages, your residence and applicable elections. Pennsylvania's official employer withholding guidance describes its reciprocal state arrangements; New York's resident-credit instructions illustrate a separate credit mechanism.
Example: Pennsylvania resident working in New Jersey
The New Jersey Division of Taxation explains that qualifying compensation earned by Pennsylvania residents employed in New Jersey is covered by the reciprocal income tax agreement. A Pennsylvania resident may submit Form NJ-165 to their employer to claim the applicable New Jersey withholding exemption. Without the required certificate, an employer may withhold New Jersey income tax. If New Jersey tax was withheld on qualifying wages, the resident may need to file a New Jersey nonresident return to seek a refund, following state instructions.
What to check on the paycheck: the actual state code, whether NJ SIT is an employee deduction, the residence and work locations payroll has on file, and whether the certificate was provided. The reciprocal agreement covers qualifying compensation, not every other kind of tax or income; applicable local wage taxes may still require separate treatment. This example does not establish the correct withholding for another state pair.
What Do NY SIT, SWT NY, CA SIT and Other State Codes Mean?
| Example label | Likely reading |
|---|---|
| NY SIT / SIT NY / SWT NY | New York state income-tax withholding |
| CA SIT / SIT CA | California state income-tax withholding in a payroll system using SIT terminology; not the separate CASDI line |
| MO SIT | Missouri state income-tax withholding |
| MN SIT | Minnesota state income-tax withholding |
| RED SIT | No reliable universal expansion; ask payroll to identify the exact code. Do not assume it means RES SIT. |
A state code indicates the recorded payroll jurisdiction, not proof that the tax was correctly sourced or that you owe the displayed amount at filing time. For unexpected labels such as Florida SITW or Texas SITW, ask payroll to identify the purpose of the entry, which jurisdiction it actually names, and whether it is a zero-amount memo or employee withholding.
SIT vs. FIT, SDI, SUI and Local Tax
| Code | Typical category | Add to SIT withheld? |
|---|---|---|
| SIT / SWT / SITW | State income-tax withholding | Yes, if it is a separately withheld amount for that state; do not double-count different labels for one entry |
| FIT / FWT | Federal income-tax withholding | No |
| OASDI / Social Security / MED | Federal Social Security and Medicare payroll taxes | No |
| LIT / local / city tax | Local income or wage tax | No; verify its own jurisdiction |
| SDI / CASDI | State disability insurance/program contribution | No |
| SUI / SUTA | Unemployment-insurance tax or program code; sometimes employer-paid | No |
| PFL / PFML | Paid-leave program where applicable | No |
For different tax lines, see FIT or FWT on a pay stub and the pay-stub deduction-code guide.
Is SIT Withheld Calculated From Gross Pay?
Not always. The state-taxable wage amount used in a paycheck calculation may differ from gross earnings and federal taxable wages. State rules, qualifying pre-tax benefits, particular retirement deductions, supplemental wages, credits or allowances, and work-state sourcing can change the base or withholding method. A federal Form W-4 is not a substitute for checking any applicable state withholding election.
Imagine a fictional paycheck with $2,500 gross earnings, $2,400 reported state-taxable wages, and $75 of SIT withheld. Its observed withholding-to-state-wages ratio is $75 ÷ $2,400 = 3.125%. That ratio describes this one check. It is not proof of the state's statutory rate, your marginal tax bracket, or your final annual tax liability. The $100 difference between gross and state-taxable wages is an illustrative payroll adjustment, not a universally deductible benefit.
Illinois publishes a 4.95% withholding rate for 2026 and a formula method using the employee’s Illinois Form IL-W-4 allowances and pay frequency. This is a specific Illinois example, not a rate that applies to every state. Illinois Department of Revenue, 2026 IL-700-T.
Illustrative inputs: $2,000 in Illinois wages subject to withholding on a biweekly paycheck (26 pay periods), one Line 1 allowance, no Line 2 allowance, and $10 of additional withholding requested on Line 3 of IL-W-4.
| Step | Calculation | Result |
|---|---|---|
| Annual Line 1 allowance | 1 × $2,925 | $2,925.00 |
| Allowance per paycheck | $2,925 ÷ 26 | $112.50 |
| Wages after allowance | $2,000 − $112.50 | $1,887.50 |
| Base formula withholding | $1,887.50 × 4.95% | $93.43 |
| With $10 extra withholding | $93.43 + $10.00 | $103.43 |
The calculation uses the formula method, with the final amount rounded to cents. Illinois also publishes wage-bracket tables; a table amount can differ slightly from a formula result because the method and rounding differ. For another state, use that state’s official rules and the employee’s actual election—do not reuse the 4.95% rate.
If you need to verify an actual deduction, use the applicable state's current employer withholding tables or official calculator, the pay frequency, taxable wages, the employee’s state withholding election and any extra withholding. A national "SIT rate" cannot be inferred from the abbreviation alone.
Why Is SIT Withheld So High, $0, or Suddenly Different?
| What you notice | Useful first check |
|---|---|
| SIT withheld increased | Compare state-taxable wages, overtime or bonus, additional withholding election, payroll correction and pay frequency. |
| SIT withheld decreased | Check changes to state-taxable wages, benefits, state election or jurisdiction. |
| New or unexpected state | Verify current address, work location, payroll assignment and state rules. |
| RES SIT and WORK SIT both show amounts | Ask which are employee deductions, then check the exact state pair, reciprocity and credits. |
| No SIT / $0 | Check state wage-tax rules, low taxable wages, exemption/election, or whether this is a memo rather than a tax deduction. |
Which states have no ordinary state wage income tax?
In 2026, Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington and Wyoming do not impose a general state income tax on ordinary wages and salaries. Washington has a separate tax on certain capital gains; other state or local payroll charges can still appear. This fact alone does not resolve multistate employment or withholding for wages sourced to another jurisdiction. See the Tax Foundation's 2026 state income-tax comparison. For Florida-specific take-home pay with zero Florida income-tax withholding, use our Florida paycheck calculator.
How Does SIT Relate to W-2 Boxes 15, 16 and 17?
| W-2 box | Meaning |
|---|---|
| 15 | State abbreviation and employer's state ID |
| 16 | State wages, tips and other applicable compensation |
| 17 | State income tax withheld for the displayed state row |
The IRS 2026 Form W-2 instructions identify Boxes 15–20 for state and local income-tax reporting and permit separate state rows. For the same state, employer and tax year, final payroll YTD state withholding will generally reconcile to the ultimately reported Box 17 amount after all relevant payments and year-end corrections. Multiple employers, multiple state rows, corrected W-2s, employer pay-period boundaries and off-cycle adjustments can prevent a simple comparison with one stub.
SIT YTD vs. W-2 Box 17 Checker
Use the final year-end total from the same employer, same state and same calendar year as the W-2 row. This tool only compares numbers; it cannot establish whether either tax amount is correct.
Nonnegative dollar amounts, with up to two decimal places; $ and grouping commas are allowed. Do not mix different states or employers.
If the figures differ, confirm which state row you selected, the pay date on the final stub, subsequent adjustments, any W-2c correction and whether you worked for more than one employer. Request payroll's year-end withholding reconciliation rather than changing a W-2 yourself.
Suppose a fictional employee's final regular paycheck shows $1,100 in SIT YTD. A subsequent off-cycle payroll adjustment includes another $25 of withholding for the same state and calendar year. Payroll's final state-withholding total becomes $1,125, which may explain a Box 17 amount of $1,125. This is a possible reconciliation scenario, not evidence that an adjustment occurred in your records. Confirm the payroll ledger and any corrected W-2 rather than assuming a difference is harmless.
What to Ask Payroll About an Unexpected SIT Deduction
"I am reviewing the paycheck dated [date]. It shows [exact tax code] for [state], Current $[amount] and YTD $[amount]. My residence state is [state] and my work location is [state]. Could you confirm the state-taxable wages, state withholding election, assigned tax jurisdiction and whether this is an employee deduction or a memo line? If anything is incorrect, what is the correction process?"
Frequently Asked Questions
What does SIT withheld mean on my paycheck?
It usually means your employer withheld state income tax from the paycheck. Verify the state abbreviation and whether the figure is Current or YTD.
Is SWT the same as SIT?
Often yes on an employee tax line: SWT usually means state withholding tax and SIT means state income tax. Your employer's payroll legend determines the exact usage.
What does SITW mean on a paycheck?
It commonly means state income tax withholding, usually the same general tax category as SIT.
What does RES. SIT or WORK SIT mean?
These commonly distinguish residence-state and work-state income-tax calculations. If both appear, verify the actual states, whether both amounts were deducted, and the applicable state rules.
What does RED SIT mean?
There is no reliable nationally standardized meaning. Confirm the exact code and payroll-system legend; do not assume RED SIT is a spelling variant of RES SIT.
Does SIT reduce take-home pay?
Yes, if SIT is actually deducted from the current paycheck. A YTD figure or employer-only informational field is not an additional current deduction.
Should SIT YTD equal W-2 Box 17?
The final total for one employer, one state and one calendar year should generally reconcile after all corrections. Compare the same state row and investigate off-cycle or year-end activity before concluding there is an error.
Is SIT withheld the same as the state tax I finally owe?
No. Withholding is an advance payment credited toward the tax determined on your applicable state return. The amount owed or refundable depends on your full tax-year circumstances and the state's rules; the pay-stub deduction alone cannot tell you the result.
Need to understand the rest of your deductions? Start with the labeled pay-stub walkthrough for earnings, taxes and Current/YTD columns. To review federal withholding specifically, see FIT/FWT explained.
Related Pay-Stub Guides
- Pay-stub abbreviations and payroll codes
- Pay-stub deductions and taxes
- FIT / FWT: federal withholding
- Current vs. YTD pay-stub columns
- How to read a pay stub
Sources, Author and Important Limitations
Research and verification: This guide is attributed to Rachel Brooks. The payroll-code explanations were checked against published payroll references, and the W-2 and state-agreement examples against the official sources below on November 12, 2026. The comparisons are fictional educational examples; no CPA, attorney, or independent professional review is claimed.
- Illinois Department of Revenue: 2026 IL-700-T withholding tables and formula (4.95% rate, $2,925 Line 1 allowance, biweekly formula and additional withholding).
- Stanford Payroll: SIT Withheld code (2026 pay statement deduction label).
- SurePayroll: SWT abbreviation on a pay stub (common state-tax abbreviation).
- Paylocity: SITW definition (state income-tax withholding category).
- IRS: 2026 Form W-2 and W-3 instructions (state and local boxes, including multi-state rows).
- New Jersey: PA/NJ reciprocal income tax agreement (qualifying compensation, NJ-165 and possible refund of NJ withholding).
- Pennsylvania: employer withholding guidance (state withholding and reciprocity context).
- New York: published Form IT-112-R resident-credit instructions (2025 tax-year version as accessible when reviewed; verify the applicable filing year).
- Tax Foundation: 2026 state income-tax comparison (wage-tax distinctions and Washington's capital-gains exception).
Official source links establish the cited reporting and jurisdiction rules; they do not independently verify an employer-specific code, individual deduction, tax election, or personal return outcome.
Payroll code names are not nationally standardized. This guide explains typical payroll terminology and does not determine your personal state tax liability, filing status or the correct amount to withhold. For a specific state pair or a disputed deduction, use the applicable state tax agency's current guidance and your employer's payroll records.
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