Every Indiana employer that pays wages must withhold state and county income tax from each paycheck and send those funds to the Indiana Department of Revenue. The Indiana employer withholding tax is not the employer’s money at any point: once it comes out of gross pay, it belongs to the state, and the business holds it in trust until it is remitted.1Indiana General Assembly. Indiana Code 6-3-4-8 – Income Withholding; Wages; Reports Doing this correctly comes down to four things: registering an account, collecting the right form from each employee, applying the current rates against the right taxable base, and hitting the deadlines the Department assigns.
Setting Up a Withholding Account
Before the first paycheck goes out, any business paying wages to an Indiana resident, or paying anyone for work performed in Indiana, has to open a withholding account with the Department of Revenue. That includes out-of-state companies with remote workers who live in the state.1Indiana General Assembly. Indiana Code 6-3-4-8 – Income Withholding; Wages; Reports
Registration runs through the Business Tax Application, Form BT-1. The application collects the federal EIN, the business structure, and expected payroll volume, and the Department uses those figures to assign a filing frequency and set up the account on the INTIME online portal. All later filings and payments go through INTIME. Paper filing is not an option.
Collecting the WH-4 From Every Employee
Before running a new hire’s first pay period, get a completed Employee Withholding Exemption and County Status Certificate (Form WH-4) on file. The form gives the employer two pieces of information payroll cannot function without: the employee’s county of residence and county of principal employment as of January 1 of the current year, and the number of exemptions the employee claims.
The January 1 rule is the one that trips employers up. Whichever Indiana county the employee lived in on January 1 sets the county tax rate for the entire calendar year, even if they move in March. If the employee did not live in Indiana on January 1 but works here, the county where they perform the work applies instead. Employees are required by statute to notify the employer within five days of any change in county residence.1Indiana General Assembly. Indiana Code 6-3-4-8 – Income Withholding; Wages; Reports
Keep signed WH-4s on file and available for Department inspection. If an employee never turns one in, withhold at zero exemptions, which produces the highest withholding. The form stays in effect until the employee submits a replacement. Without a WH-4 on file for a given employee, the employer has no defense if the Department audits and finds under-withholding.
Calculating What to Withhold
The calculation each pay period is: gross wages, minus the per-paycheck share of the employee’s annual exemption allowance, times the state rate, plus the same taxable amount times the county rate.
Exemption Amounts
Exemptions on the WH-4 reduce taxable wages before rates are applied. The dollar amounts differ by exemption type, as set out in the Department’s Departmental Notice #1:2Indiana Department of Revenue. How to Compute Withholding for State and County Income Tax
- Personal exemptions (WH-4 line 5): $1,000 per year each, including additional exemptions when the employee or spouse is age 65 or older, or legally blind.
- Dependent exemptions (WH-4 line 6): $1,500 per year for each qualifying dependent.
- First-time dependent exemptions (WH-4 line 7): $1,500 per year for each qualifying dependent being claimed for the first time.
- Adopted child exemptions (WH-4 line 8): $3,000 per year for each qualifying adopted child.
Add the annual amounts, divide by the number of pay periods, and subtract that figure from gross wages before applying rates. An employee with two personal exemptions and one dependent reduces annual taxable wages by $3,500.
State Rate
Indiana uses a single flat state income tax rate rather than brackets. It was 3.05% for the 2024 tax year, following an accelerated reduction schedule enacted in House Bill 1001 in 2023.3Tax Foundation. State Individual Income Tax Rates and Brackets, 2024 Further annual reductions are scheduled, so pull the current-year rate from Departmental Notice #1 each January.2Indiana Department of Revenue. How to Compute Withholding for State and County Income Tax
County Rate
All 92 counties levy their own income tax on top of the state rate. Current county rates run from 0.50% in Porter County to 3.00% in Randolph County, with Marion County at 2.02% and Allen County at 1.59% as commonly referenced examples.2Indiana Department of Revenue. How to Compute Withholding for State and County Income Tax County rates can change each year, and the current list is in Departmental Notice #1. Both the state and county rates apply to the same taxable base.
When Indiana Withholding Doesn’t Apply
Indiana has reciprocal income tax agreements with Kentucky, Michigan, Ohio, Pennsylvania, and Wisconsin.4Indiana Department of Revenue. Income Tax Information Bulletin #28 An employee who lives in one of those states but works in Indiana owes income tax only to the home state. If the employee submits the proper exemption paperwork, the employer does not withhold Indiana state or county income tax from that person’s wages. Keep the documentation on file to show why Indiana withholding was not applied.
Filing Frequency and Payment Deadlines
The Department assigns each employer to one of three schedules based on prior-year withholding volume. Missing a deadline triggers automatic penalties.
- Early monthly filers: employers whose average monthly withholding exceeded $1,000 in the prior calendar year remit within 20 days after the end of each month.5Indiana General Assembly. Indiana Code 6-3-4-8.1 – Monthly Return and Remittance; Periodic Deposits
- Regular monthly filers: employers below that threshold file and pay within 30 days after the end of each month.1Indiana General Assembly. Indiana Code 6-3-4-8 – Income Withholding; Wages; Reports
- Annual filers: the Department may allow annual filing when average monthly withholding in the prior year did not exceed $1,000. The return and payment are due by the last day of the month following the close of the calendar year.1Indiana General Assembly. Indiana Code 6-3-4-8 – Income Withholding; Wages; Reports
Everything files through INTIME. The portal issues a confirmation number for each submission; save it. When a monthly report or payment is past due, the Department sends an electronic notice within seven days.5Indiana General Assembly. Indiana Code 6-3-4-8.1 – Monthly Return and Remittance; Periodic Deposits
Year-End Reconciliation
By January 31 each year, every employer that withheld Indiana income tax during the prior year files the Annual Withholding Tax Settlement, Form WH-3.6Indiana Department of Revenue. Filing Deadlines The WH-3 reconciles what was withheld from employees against what was actually remitted through INTIME. Any shortfall is settled at the time the WH-3 is filed.
The filing also includes copies of all W-2s and applicable 1099s for every individual who received taxable payments during the year. An employer that stopped paying wages mid-year still has to file the WH-3 and any outstanding wage statements. Closing payroll before year end does not remove the annual filing requirement.
Penalties and Personal Liability
Indiana imposes a 10% penalty on any withholding tax not remitted on time, and the same 10% applies to late or unfiled returns and to deficiencies identified by the Department. A separate 20% penalty applies when corporations, partnerships, or trusts fail to withhold under specific nonresident withholding statutes.7Indiana General Assembly. Indiana Code 6-8.1-10-2.1 – Liability for Penalty; Reasonable Cause
Missing the W-2 and 1099 filing deadline draws its own penalty: $10 for each information return that is late or not filed electronically when electronic filing is required, capped at $25,000 per calendar year.8Indiana General Assembly. Indiana Code 6-8.1-10-6 – Failure to File Information Return; Penalty For an employer with a large workforce, that number climbs quickly.
The heavier risk is personal. Because withheld amounts are state property held in trust, responsible individuals within the business can be held personally liable if the business fails to remit. That liability can follow owners and officers even after the business closes.
New Hire Reporting
Separate from withholding, Indiana employers must report every newly hired and rehired employee to the Indiana New Hire Reporting Center. As of July 2024, these reports must be submitted electronically.9Indiana New Hire Reporting Center. Indiana New Hire Reporting Center It runs alongside the withholding setup rather than through it, and it is easy to miss during onboarding.
The Federal Layer
Indiana withholding sits next to federal payroll obligations that run on their own filings and deposit schedules.
- FICA: 6.2% Social Security and 1.45% Medicare from each side, employer matching the employee’s share.10Social Security Administration. Contribution and Benefit Base
- FUTA: 6.0% on the first $7,000 of each employee’s wages, with a 5.4% credit for employers paying state unemployment on time, reducing the effective rate to 0.6%.11Internal Revenue Service. Topic No. 759, Form 940 – Employers Annual Federal Unemployment (FUTA) Tax Return
- Form 941: federal income tax withholding and FICA reported quarterly, due April 30, July 31, October 31, and January 31.12Internal Revenue Service. Instructions for Form 941
Indiana monthly deadlines and federal quarterly deadlines rarely land on the same date, so the two calendars need to be tracked separately from the day the account opens.