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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesMost Washington workers should not expect a smaller paycheck because of the state’s newly enacted individual income tax. The tax is scheduled to begin January 1, 2028, applies only when an individual’s or married couple’s annual adjusted gross income (AGI) exceeds $1 million, and the first returns are due in April 2029. Washington has not yet published final rules explaining whether employers will withhold the tax from paychecks or how estimated payments will work.
Before changing payroll elections, determine whether your annual AGI could exceed the threshold, distinguish AGI from wages, and follow future guidance from the Washington Department of Revenue (DOR). If you are below the threshold, this law does not give you a reason to change withholding today.
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Does Washington currently have an individual income tax?
No. The DOR’s FAQ states: “No. Washington does not currently have an individual income tax.” That remains the situation before the new law takes effect. The enacted tax is a future change, not an immediate deduction from every Washington paycheck.
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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →The DOR identifies January 1, 2028 as the effective date. The first individual returns are scheduled to be due in April 2029. A paycheck issued in 2026 or 2027 should not be reduced by this new income tax merely because the law has been enacted.
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The timing matters because payroll systems, tax forms and payment procedures may be designed before the first filing season. DOR says additional information about forms, filing requirements and administration will be provided. Final employer-withholding and estimated-payment rules were not established in the available official guidance.
Who can be subject to the new tax?
The DOR says the tax applies to individuals and married couples filing jointly whose annual adjusted gross income exceeds $1 million. It also explicitly says, “No. The new tax does not apply to all taxpayers.” The threshold is therefore a central screening question: if your annual AGI does not exceed $1 million, the new individual income tax is not aimed at your return.
AGI is not the same as your salary
AGI is a federal tax concept, not simply the amount shown as wages on one pay stub. Depending on the taxpayer, AGI can include several types of income and can be reduced by adjustments recognized under federal rules. A person with a $1 million salary is not automatically in exactly the same position as someone whose income reaches that level through a combination of wages, business income, investment income or other sources.
Use your federal tax return and year-to-date income records to estimate AGI rather than comparing the threshold with one month’s gross pay. Married couples filing jointly must consider the couple’s combined annual AGI, not each spouse’s income in isolation.
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The threshold does not tell you the final tax bill
Crossing the $1 million AGI threshold identifies taxpayers who may be subject to the tax; it does not mean that 9.9% is charged on every dollar of AGI. Washington’s calculation begins with federal AGI, applies statutory modifications, allows a $1 million standard deduction, and may allow credits. The taxable amount is determined after those steps.
What are the important dates and figures?
| Item | Official figure or date | What it means |
|---|---|---|
| Effective date | January 1, 2028 | The new tax is scheduled to begin applying from this date. |
| First returns due | April 2029 | The first filing deadline identified by DOR for the new tax. |
| Income threshold | Annual AGI exceeding $1 million | Applies to individuals and married couples filing jointly, according to DOR’s FAQ. |
| Tax rate | 9.9% | The rate imposed on Washington taxable income under RCW 82A.04.030; it is not a rate on every paycheck dollar. |
| Standard deduction | $1 million | The deduction described in DOR’s 2026 Legislative Report as part of the calculation. |
The amounts and dates above come from current state materials. Administrative instructions may add detail before the first filing season, so check DOR’s income-tax overview for updated forms and rules.
How is Washington taxable income calculated?
The law uses a multistep calculation rather than applying the headline rate directly to gross pay. DOR’s legislative summary describes the process in broad terms:
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- Apply statutory modifications. Washington law can require additions or subtractions from the federal starting figure.
- Apply the $1 million standard deduction. DOR identifies this deduction in its 2026 legislative summary.
- Determine Washington taxable income. The 9.9% rate applies to this resulting base.
- Apply available credits. Credits can reduce the amount owed when a taxpayer qualifies.
Because the modifications, deduction and credits affect the taxable base, a simple calculation such as “income minus $1 million, multiplied by 9.9%” may not match an actual return. The exact treatment of different income types and deductions should be confirmed in the final instructions or with a tax professional experienced with Washington returns.
What should you do now if your paycheck appears smaller?
1. Check the date and the payroll line item
Look at the pay period, the effective date of any change and the exact label on your pay statement. A new deduction appearing before January 1, 2028 is not automatically caused by this law. If a line is labeled as Washington individual income-tax withholding before the effective date, ask your payroll or human-resources department to explain it and correct any error.
2. Compare your projected annual AGI with $1 million
Estimate your full-year AGI using your federal return, current year-to-date records and expected income from all relevant sources. Do not use a single paycheck, a base salary alone or a gross-revenue figure as a substitute for AGI. For a married couple filing jointly, make the estimate on a combined basis.
- If projected AGI is below the threshold, this new tax does not provide a reason to alter payroll withholding.
- If projected AGI may exceed the threshold, keep records and monitor DOR’s implementation guidance.
- If your income is close to the threshold, update the estimate during the year as bonuses, investment income or other changes occur.
3. Do not invent a withholding change
DOR has not yet confirmed the final employer-withholding process or any estimated-payment cadence in the available guidance. Do not add a state withholding amount to your payroll election based only on the 9.9% rate, and do not assume that your employer must begin withholding immediately. Wait for official instructions and any notice from your employer or payroll provider.
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4. Ask payroll what it knows when implementation begins
Once DOR publishes forms and administration rules, ask your employer whether its payroll system will withhold the tax, whether employees must provide a new form, and when any change will appear. Request the answer in writing if a significant paycheck change is involved. Payroll staff can explain the mechanics used by the employer but cannot determine your final taxable income or credits.
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5. Get specialized advice if you may exceed the threshold
A qualified tax professional can evaluate the federal AGI starting point, Washington modifications, the standard deduction and any credits together. When choosing help, look for:
- Experience preparing high-income individual returns.
- Specific familiarity with Washington’s new income-tax rules.
- A clear explanation of how wages, business income, investments and other items enter the calculation.
- A written fee structure and a description of what is included, such as projections, return preparation or payment planning.
No particular provider is required. The important question is whether the adviser can apply the final Washington rules to your facts rather than relying on a generic salary estimate.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What if you are paid through bonuses, equity or a business?
Variable compensation can make the $1 million test harder to estimate. A year-end bonus, sale of investments, business income or another large item can move AGI above the threshold even when regular wages are lower. Keep a running estimate and save the documents that support it, including pay statements, bonus notices, brokerage records and business-income information.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallEquity compensation and business arrangements can have tax consequences that are not visible on a normal paycheck. Do not assume that an employer’s treatment of compensation answers the separate question of how Washington taxable income will be calculated. A professional can address timing and documentation after the state publishes the necessary rules.
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How to prepare for the first filing season
Organize the information the calculation will use
Keep copies of federal returns, income statements and records of adjustments. Maintain a separate file for items that could be relevant to Washington modifications or credits. Good records will make it easier to reconcile any payroll withholding with the eventual return.
Watch the official sources
DOR’s income-tax FAQ answers the basic questions about the threshold and dates. Its income-tax information page is the place to look for new forms, filing instructions and administrative updates. The statutory rate is set out in the Legislature’s RCW 82A.04.030, while the calculation overview appears in DOR’s 2026 Legislative Report.
Build a cash-flow plan only after the rules are clear
If you may owe the tax, discuss possible cash needs with your adviser, but do not treat an unconfirmed withholding schedule as final. Once DOR explains whether payments are made through payroll, estimated payments, the annual return or a combination, you can set a plan that matches the official deadlines.
Common misconceptions about a smaller Washington paycheck
- “The law means every worker will lose 9.9%.” No. The rate applies to Washington taxable income for taxpayers subject to the law, not to every worker’s gross pay.
- “The deduction starts as soon as the law is enacted.” No. The scheduled effective date is January 1, 2028.
- “A $1 million salary automatically creates a $99,000 bill.” Not necessarily. The calculation includes modifications, a $1 million standard deduction and possible credits.
- “My employer must already be withholding it.” DOR has not yet published final withholding procedures in the available guidance.
- “A paycheck change proves the new tax is responsible.” Check the pay-period date and deduction label first, then ask payroll for an explanation.
Bottom line for Washington workers
For most employees, the practical action is to make no immediate payroll change. The new tax is scheduled for 2028, is limited to individuals and joint filers with annual AGI above $1 million, and uses a taxable-income calculation that is more involved than applying 9.9% to wages. If your income may exceed the threshold, track AGI, preserve records, monitor DOR’s updates and obtain individualized advice before changing withholding or making payments.
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