Illinois Tax Preparer Requirements 2025-2026

Illinois requires no state license, no exam, and no continuing education for non-credentialed paid tax preparers. What Illinois does require is straightforward but carries real teeth: every paid preparer must write their IRS-issued PTIN on every Illinois income or business tax return they prepare, or face a $50-per-return penalty capped at $25,000 per calendar year. Electronic returns are rejected outright without it. Beyond that single compliance requirement, Illinois rewards preparers who understand the state's tax structure. The 4.95% flat rate is constitutionally fixed. The retirement income exemption is one of the broadest in the country: Social Security benefits, pensions, 401(k) and IRA distributions, military retirement pay, and Railroad Retirement are all fully exempt with no income cap. Tips and overtime deductions from the federal One Big Beautiful Bill Act (OBBBA) do not carry over to the Illinois return. And the Personal Property Replacement Tax (PPRT) is a tax that trips up preparers new to Illinois more reliably than almost anything else. This guide covers every requirement and tax detail an Illinois paid preparer needs for TY2025 returns filed in 2026, with extra depth on the client niches that make Illinois one of the more complex and rewarding state markets in the country.

Does Illinois Require a State Tax Preparer License?

Illinois does NOT require non-credentialed paid tax preparers to obtain a state license, pass an examination, or complete state-mandated continuing education hours before preparing returns for compensation. The Illinois Department of Financial and Professional Regulation (IDFPR) has no authority over non-credentialed tax preparers. Any individual who obtains a federal PTIN may legally prepare Illinois individual and business income tax returns for pay.

For context, this puts Illinois alongside the majority of states. California (CTEC registration, 60-hour course), New York (registration and CE), Maryland, Oregon, and Connecticut all impose additional requirements on top of the federal baseline. Illinois does not.

What Non-Credentialed Preparers Cannot Do

Non-credentialed preparers may not use the titles "CPA," "Certified Public Accountant," "Public Accountant," or any title that implies CPA licensure under the Illinois Public Accounting Act (225 ILCS 450/). They may not perform audits, reviews, or attest-level compilations. Using protected titles or performing attest services without a CPA license can result in IDFPR enforcement action.

What Non-Credentialed Preparers Can Do

Non-credentialed preparers may prepare individual returns (IL-1040 and all schedules), business income tax returns, self-employment schedules, multi-state returns, and tax planning work. The scope of income tax preparation in Illinois is broadly available to any PTIN holder who complies with the Illinois PTIN mandate described below.

PTIN and EFIN: Federal Requirements

PTIN 2026 fee: $18.75 ($10.00 IRS base fee plus $8.75 third-party contractor fee, reduced from $19.75 effective September 30, 2025 following an IRS biennial review). Renew annually by December 31 at irs.gov/ptin. Renewal takes approximately 15 minutes online.

An EFIN (Electronic Filing Identification Number) is required if you plan to e-file returns for clients. Apply through IRS e-Services at irs.gov. Illinois does not issue a separate state EFIN; participation in the IRS Fed/State e-File program covers Illinois e-filing.

FTC Safeguards Rule (WISP)

Every paid tax preparer, including solo practitioners, must maintain a Written Information Security Plan (WISP) under the Gramm-Leach-Bliley Act (15 U.S.C. 6801(b)). Required elements include a designated responsible individual, multi-factor authentication (MFA) for all systems containing client data, a written risk assessment, and an incident response procedure. FTC penalties reach up to $46,517 per violation per day. A free WISP template is available in IRS Publication 5708.

Illinois State Tax Preparer Oversight Act: The PTIN Mandate

This is the one Illinois-specific compliance requirement every paid preparer must know. Under Illinois Public Act 99-0641 (codified at 35 ILCS 35/, the Illinois State Tax Preparer Oversight Act), effective for tax years beginning January 1, 2017, the following rules apply to every paid preparer of an Illinois Individual or Business Income Tax return:

• Every paid preparer must include their IRS-issued PTIN on every Illinois income tax return they prepare for compensation.
• Preparers employed by or associated with a firm must also include the firm name, Federal Employer Identification Number (FEIN), firm address, and firm phone number on every return.
• Electronic returns submitted without complete PTIN information are rejected by IDOR.
• Paper returns with missing or incomplete PTIN information trigger a notification from IDOR.

Penalty for Missing PTIN

The penalty is $50 per return, with a maximum of $25,000 per calendar year. The penalty may be waived if the preparer can demonstrate the failure resulted from reasonable cause rather than willful neglect. IDOR uses PTINs to identify preparers, monitor error rates across returns, and flag patterns consistent with fraud or negligent preparation.

IDOR Enforcement Authority

The Illinois State Tax Preparer Oversight Act gives IDOR authority to bar or suspend a preparer from preparing Illinois returns for "good cause." Good cause includes documented patterns of high error rates, unsubstantiated tax position claims, and evidence of fraud or willful misrepresentation. Before any disciplinary action, IDOR must provide 30 days written notice and an opportunity for a hearing. Decisions are subject to judicial review under the Illinois Administrative Review Law. IDOR also maintains information-sharing protocols with the IRS and may act on referrals from either direction.

Optional Voluntary Credential: Annual Filing Season Program (AFSP)

Non-credentialed preparers may voluntarily complete the IRS Annual Filing Season Program (AFSP). The AFSP requires 18 hours of annual CE (including a 6-hour federal tax law refresher course with a test, 3 hours of federal tax law updates, 2 hours of ethics, and 7 elective hours). AFSP holders receive limited IRS representation rights (representing clients before exam, customer service, and collections). The AFSP is entirely voluntary in Illinois; there is no state CE requirement.

America's Tax Professionals (ATP) is an IRS-approved AFSP CE provider (provider number P619F). Preparers who want to earn the AFSP Record of Completion can complete qualifying hours through ATP's CE courses.

Illinois Individual Income Tax for TY2025

The Flat Rate: 4.95%

Illinois imposes a single flat income tax rate of 4.95% on all net income for TY2025. There are no brackets, no surcharges, and no scheduled changes. The flat rate is not a policy choice that the legislature can easily reverse: the Illinois Constitution (Article IX, Section 3(a)) requires that rates be uniform among taxpayers in the same class. Any move to a graduated structure requires a constitutional amendment passed by 60% of each legislative chamber and then ratified by voters.

Voters have rejected this path before. The 2020 "Fair Tax" referendum to authorize graduated rates failed by a margin of 55% to 45%. A 2026 proposal to add a 3% surcharge on income above $1 million failed to advance through the legislature before the constitutional amendment deadline. The 4.95% rate is stable for the foreseeable future.

For reference: Illinois C corporations pay a 7.0% income tax plus 2.5% Personal Property Replacement Tax (PPRT) for a combined effective rate of 9.5%, one of the highest corporate rates in the country. This is relevant for preparers advising clients on entity choice.

Starting Point: Federal AGI

Illinois individual income tax begins with federal Adjusted Gross Income (the amount on IL-1040 Line 1, drawn from federal Form 1040 Line 11). Illinois does not use federal itemized deductions and does not have a state standard deduction. Adjustments flow through Schedule M (additions and subtractions) and the retirement income subtraction on IL-1040 Line 5.

Personal Exemptions (No Standard Deduction)

Illinois uses personal exemptions rather than a standard deduction. For TY2025:

• Basic personal exemption: $2,850 per exemption. Each taxpayer, spouse (on joint returns), and qualifying dependent generates one $2,850 exemption.
• Additional exemption for age 65 or older: $1,000 per qualifying taxpayer or spouse who is 65 or older at year-end.
• Additional exemption for blindness: $1,000 per qualifying taxpayer or spouse who is legally blind.

Income phase-out: The personal exemption allowance is completely disallowed if federal AGI exceeds $500,000 for Married Filing Jointly returns or $250,000 for all other filing statuses. The same AGI thresholds also disallow the Property Tax Credit and K-12 Education Expense Credit.

Illinois Schedule M: Key Additions and Subtractions

Schedule M adjusts federal AGI up and down to arrive at Illinois net income. The additions and subtractions that come up most often in Illinois practice are listed below. This is not the complete list; consult the current Schedule M instructions for all items.

Common Schedule M Additions (Added to Federal AGI)

Common Schedule M Subtractions (Subtracted from Federal AGI)

Out-of-state income is not subtracted on Schedule M. Illinois residents who earned income in another state and paid tax there claim a credit on Schedule CR, not a Schedule M subtraction.

Illinois Retirement Income Exemption: One of the Most Generous in the Nation

For preparers building a retirement-client practice, Illinois is one of the best states in the country to work in. Illinois exempts the following types of retirement income in full, with no income cap. These subtractions are reported on IL-1040 Line 5, not on Schedule M:

• Social Security benefits (the federally taxable portion that flows into federal AGI)
• 401(k) and 403(b) plan distributions
• Traditional IRA distributions
• Roth IRA distributions (including Roth conversions from a traditional IRA)
• SEP-IRA, SIMPLE IRA, and Keogh (HR-10) plan distributions
• Government deferred compensation plans (including 457 plans)
• All government pensions: federal civilian, state, municipal, and teacher pensions
• Military retirement pay (all branches, active duty retirees, and reserve component retirees)
• Railroad Retirement Board benefits (Tier 1 and Tier 2)
• Private employer qualified plan pensions and annuities from qualified plans
• Lump-sum distributions of appreciated employer securities

Practical impact: A married couple with $200,000 in IRA distributions, $50,000 in Social Security, and $100,000 in pension income owes exactly $0 in Illinois income tax on any of it. Only earned income (wages, self-employment net income) and investment income (dividends, interest, capital gains) remain taxable at 4.95%.

The Exception: Non-Qualified Annuities

Non-qualified annuities (annuities purchased outside a qualified retirement plan, with after-tax money, not inside an employer plan or IRA) are not exempt. The federally taxable gain or growth portion of distributions from a non-qualified annuity is subject to Illinois tax at 4.95%. Illinois Publication 120 is clear: you may not subtract income that is not from a qualified employee benefit plan. This is the single most common retirement income trap in Illinois practice. When a client hands you a 1099-R with a distribution code that does not correspond to a qualified plan, verify whether the annuity is qualified or non-qualified before claiming the exemption.

Capital Gains: Taxed at 4.95%

Illinois does not offer a preferential capital gains rate. Long-term capital gains are taxed at the same 4.95% flat rate as all other income. This is a key distinction from the federal 0%/15%/20% preferential rate structure. Retirees who rely on investment portfolios or who sell appreciated real estate need to understand that Illinois taxes every dollar of gain at 4.95%, regardless of holding period.

OBBBA and Illinois Conformity: What Changed for TY2025

Illinois uses rolling conformity to the Internal Revenue Code. Federal IRC changes are automatically adopted unless the Illinois legislature explicitly decouples. This is the starting point for every OBBBA question. Illinois SB 1911 (signed by Governor Pritzker in January 2026) was the legislature's formal response to OBBBA, and it did two things: it conformed to certain OBBBA provisions and it explicitly decoupled from one specific new provision.

What Illinois Conforms To Under OBBBA

• NCTI (replaces GILTI): Illinois conforms to the OBBBA replacement of GILTI (IRC 951A) with Net Controlled Foreign Corporation Tested Income (NCTI). For tax years ending December 31, 2025 and later, 50% of NCTI is subject to Illinois tax. Note that SB 1911 does not include apportionment factor representation for multistate entities, which is a technical gap practitioners should flag for affected clients.
• Excess business losses for trusts and estates (IRC 461(l)): SB 1911 permanently conforms to the OBBBA's permanent treatment of excess business losses for trusts and estates.
• R&E expensing (IRC 174A): As a rolling-conformity state with no enacted decoupling on this provision, Illinois is expected to conform to immediate expensing of domestic research and experimental expenditures. IDOR had not published comprehensive guidance on this point as of the research date. Monitor idor.gov and taxschool.illinois.edu for updates.
• Business interest limitation (IRC 163(j)): Rolling conformity applies; the loosened limitations under OBBBA are expected to flow through to Illinois. Verify against IDOR guidance as it is published.
• PTE tax made permanent: SB 1911 removed the January 1, 2026 sunset date from the Illinois optional Pass-Through Entity tax. The PTE election is now a permanent planning tool.

What Illinois Decoupled From

IRC 168(n) bonus depreciation on nonresidential real property: SB 1911 explicitly decoupled from the OBBBA's new Section 168(n), which permits 100% first-year expensing of certain nonresidential real property. This decoupling is effective for tax years beginning on or after January 1, 2026. For TY2025, this specific decoupling does not yet apply. The existing decoupling from IRC 168(k) bonus depreciation (Form IL-4562 addback) remains fully in effect for TY2025 and continues to apply to all property in scope.

Tips and Overtime Deductions: Not Available in Illinois

The OBBBA added two new federal deductions: a deduction for qualified tips (IRC 224, up to $25,000) and a deduction for overtime compensation (IRC 225). Both deductions reduce income on federal Schedule 1 (above-the-line), which reduces federal AGI. Because Illinois starts from federal AGI, these deductions have already been taken before Illinois income is computed. There is no separate add-back line on the Illinois return for these items; they simply do not flow through. Preparers should communicate this clearly to clients who earn tip income or overtime pay and expect a matching Illinois benefit.

SALT Cap Increase: $40,000 for TY2025

The OBBBA raised the federal SALT deduction cap to $40,000 for TY2025 (phasing out for very high earners; scheduled to revert to $10,000 in 2030). This is materially significant for Illinois clients. Illinois has the second-highest effective property tax rate in the United States. A Will County homeowner paying $8,500 in property tax, combined with $8,000-$15,000 in Illinois income tax, can now deduct most or all of that combined amount on the federal return, depending on their income level. This is a significant shift from the TY2017-TY2024 period when the $10,000 cap sharply limited Illinois deductions.

The Illinois PTE tax election remains valuable even with the higher SALT cap, because entity-level PTE tax deductions are not subject to the SALT cap at all. Pass-through entity owners with total SALT above or approaching $40,000 should still evaluate the PTE election for TY2025 through TY2029.

Illinois Tax Credits

Illinois Earned Income Tax Credit

Illinois offers a state EITC equal to approximately 10 to 20 percent of the federal Earned Income Tax Credit for TY2025. Sources vary on the exact percentage for the current tax year. Before filing, confirm the exact percentage directly from the TY2025 Schedule IL-E/EIC instructions published by IDOR. The Illinois EITC is fully refundable, meaning it can generate a refund even if the taxpayer has no Illinois income tax liability.

Illinois Child Tax Credit (New for TY2025)

A new Illinois Child Tax Credit, effective TY2025, equals 40% of the Illinois EITC for taxpayers who qualify for the Illinois EITC and have at least one dependent child under age 12 as of December 31, 2025. This credit is in addition to the EITC and is also fully refundable.

Illinois Property Tax Credit (Schedule ICR)

Illinois residents who own and occupy their principal residence in Illinois may claim a property tax credit equal to 5% of Illinois property taxes paid on that residence. The credit is reported on Schedule ICR (Illinois Credits).

• Applies only to the taxpayer's principal residence in Illinois. Vacation homes, rental properties, farmland, and vacant lots do not qualify.
• Denied if federal AGI exceeds $500,000 (MFJ) or $250,000 (all other filing statuses).
• See Schedule ICR instructions for the specific timing rule on which year's property tax payments qualify.

Given Illinois's high property taxes, this credit provides meaningful relief at scale. A Will County homeowner paying $8,500 annually in property taxes receives a $425 credit against Illinois income tax.

K-12 Education Expense Credit

Illinois allows a credit of 25% of qualifying K-12 education expenses exceeding $250 per taxpayer, up to a maximum credit of $750 per family. Qualifying expenses include tuition, book rental, and lab fees for students in kindergarten through 12th grade at Illinois schools. The same AGI phase-out thresholds that apply to personal exemptions ($500,000 MFJ / $250,000 others) also eliminate this credit.

Setting Up Your Illinois Tax Practice: LLC, PPRT, and Franchise Tax

Illinois LLC Formation Costs

Illinois LLCs are registered through the Illinois Secretary of State, Department of Business Services.

• Articles of Organization (one-time): $150
• Annual Report: $75 per year, due before the first day of the LLC's anniversary month. Failure to file on time triggers a $100 late penalty and eventually administrative dissolution.

Personal Property Replacement Tax (PPRT): The Illinois Tax That Trips Up New Preparers

The PPRT is a separate Illinois tax paid at the entity level by pass-through entities. It is not the same as the Illinois income tax, and it is not reflected on the individual owners' IL-1040. Preparers new to Illinois consistently overlook it, which creates both missed deductions and potential client penalties.

The PPRT is deductible as a state tax at the entity level for federal income tax purposes, which partially offsets the cost. Individual owners receive a credit against their personal Illinois income tax liability for their allocable share of PPRT paid.

PPRT plus PTE tax: If a partnership or S corporation makes the optional 4.95% PTE tax election, it pays both the 1.5% PPRT and the 4.95% PTE tax at the entity level, for a combined entity-level rate of 6.45%. Partners and shareholders then receive a refundable credit for their share of PTE tax paid on their personal IL-1040.

Illinois Franchise Tax: Applies to Corporations, Generally Not to Standard LLCs

The Illinois franchise tax applies to domestic and foreign corporations, calculated on the value of paid-in capital allocated to Illinois. Standard LLCs treated as partnerships or disregarded entities are generally not subject to the franchise tax. Effective January 1, 2025, the first $10,000 of annual franchise tax liability is exempt, so small corporations with modest capitalization often owe nothing. A tax preparer operating as a standard single-member or multi-member LLC does not owe the franchise tax.

High-Value Client Niches in Illinois

Retirees: The Most Powerful Value Proposition in the State

Illinois's retirement income exemption is comprehensive and has no income limit. Social Security benefits, all pension income from qualified plans (including Caterpillar and John Deere defined-benefit plans in the Peoria and Quad Cities areas), IRAs, 401(k) distributions, military retirement pay, and Railroad Retirement are all fully exempt. Capital gains on investments remain taxable at 4.95%, and non-qualified annuity gains are the primary trap to watch.

For retirees relocating from high-tax states like California, New York, or New Jersey, the Illinois combination of no retirement income tax, no local income tax, and a flat 4.95% rate on earned and investment income is genuinely competitive. The key planning conversation is around investment income (dividends, interest, capital gains taxed at 4.95% with no preferential rate) and any non-qualified annuity gains.

Military Personnel: Scott AFB, Great Lakes NAS, Rock Island Arsenal

Illinois hosts three major military installations, each creating a concentrated client population with distinct Illinois tax issues:

• Scott Air Force Base (Belleville and O'Fallon, southwest Illinois near the St. Louis metro)
• Naval Station Great Lakes (North Chicago, Lake County)
• Rock Island Arsenal (Rock Island, Quad Cities metro)

Active duty pay: Subtracted on Schedule M. Applies to all branches, Reserves, and any state's National Guard, including drill pay and basic training pay. Illinois residents maintain this exemption regardless of where they are stationed.

Military retirement pay: Fully exempt via IL-1040 Line 5, with no income cap, no age restriction, and no application required.

Nonresident military: Service members domiciled in another state who are stationed in Illinois do not owe Illinois income tax on their military pay.

Military spouse wages: Under the Veterans Benefits and Transition Act of 2018, a military spouse may elect to use the service member's state of domicile for tax purposes. If a couple is in Illinois only because of military orders, and the spouse makes that election, the spouse's wages earned in Illinois are not subject to Illinois income tax. This is one of the most overlooked planning points for military families near Scott AFB, Great Lakes, and Rock Island.

Chicago Financial Services: Equity Compensation and High Earners

Chicago is home to the CME Group, CBOE, major trading firms, hedge funds, and a large financial technology sector. Preparers serving this population encounter Illinois-specific issues around equity compensation:

• RSU vests: Restricted Stock Unit vest events generate ordinary income at 4.95% on the full fair market value of vested shares. Multi-state apportionment applies if the grant period spanned employment in multiple states (time-ratio method). Employer withholding on RSU vests is commonly inadequate because it is done at the federal supplemental rate (22%), not the employee's actual marginal rate.
• NQSOs: The spread on exercise of a Non-Qualified Stock Option is ordinary income taxable at 4.95%. Multi-state apportionment using a time-based formula for the grant-to-exercise period applies to employees who changed their state of residence during the grant period.
• ISOs: Illinois has no state Alternative Minimum Tax, so an Incentive Stock Option exercise does not create additional Illinois tax at the time of exercise. Illinois income arises only when the shares are sold.

Collar Counties: DuPage, Lake, Will, Kane

The Illinois collar counties have some of the highest property taxes in the nation:

With the OBBBA SALT cap at $40,000 for TY2025, suburban homeowners paying $7,000 to $8,500 in property taxes plus $5,000 to $15,000 in Illinois income tax can now deduct most or all of those combined state and local taxes on the federal return (subject to the high-income phase-out). This shift from the prior $10,000 cap is the most important federal tax change for Illinois suburban clients since 2017.

Note that Chicago does not impose a municipal income tax on wages. Local income complexity in the Chicago metro relates to property tax bills, not a separate payroll-level local income tax.

Downstate Illinois: Agriculture and Manufacturing

Central and downstate Illinois is dominated by corn and soybean production and major manufacturing employers including Caterpillar (Peoria area) and John Deere (Moline area). Key issues for these clients:

• Caterpillar and Deere retirees: Defined-benefit pension income from these employers is fully exempt from Illinois income tax. Retirees in the Peoria and Quad Cities areas are a well-defined and high-value client segment for preparers who can demonstrate this benefit clearly.
• IRC 168(k) addback on heavy equipment: Farm operators and manufacturing businesses that claimed federal bonus depreciation on large equipment purchases under IRC 168(k) must add back that depreciation on Form IL-4562 for Illinois purposes. This is one of the most common preparation errors on complex Illinois business returns and creates significant differences between federal and Illinois taxable income in the purchase year.
• Section 179: Illinois does not decouple from IRC Section 179 expensing. The full federal 179 deduction is allowed for Illinois purposes. This is distinct from the 168(k) addback issue, which applies to bonus depreciation only.
• Cash-basis farm income: Grain sales and input purchase timing are critical on cash-basis farm returns. Installment sales on farm real estate and equipment dispositions can spread large gain recognition across multiple years.
• OBBBA Section 199A (QBI deduction): The permanent extension of the 20% qualified business income deduction benefits farm operators at the federal level. Because the 199A deduction reduces federal AGI (via Schedule 1), and Illinois starts from federal AGI, farm operators receive the indirect benefit on their Illinois return as well, even though Illinois has no separate 199A provision.

Illinois Tax Forms Reference

Frequently Asked Questions