William A. "Bill" Peithmann, Tax Attorney in Mahomet, Illinois
focused on Tax and Trusts
Mahomet, IL
Trusted tax attorney serving Mahomet.
- 3
- Bar admissions
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Quick answer
William A. "Bill" Peithmann is an attorney based in Mahomet, ILLINOIS. The practice focuses on Tax and Trusts. Currently practicing at The Peithmann Law Office.
- Based in
- Mahomet, ILLINOIS
- Experience
- attorney
- Known for
- Tax · Trusts
- Handles Tax and Trusts matters from Mahomet, ILLINOIS.
- Recognized with Lawyer of the Year — Trusts and Estates, Springfield (IL) (2016).
About William A. "Bill" Peithmann: William A. "Bill" Peithmann is an attorney based in Mahomet, ILLINOIS. The practice focuses on Tax and Trusts. Currently practicing at The Peithmann Law Office.
Areas of practice
Legal matters William takes on
William concentrates on tax and trusts. Each area below outlines the kind of case William handles, typical outcomes to expect, and how the intake process starts.
Tax cases in Mahomet, Illinois
William takes tax matters in Mahomet, Illinois. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before William agrees to represent you.
Trusts cases in Mahomet, Illinois
William takes trusts matters in Mahomet, Illinois. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before William agrees to represent you.
Biography
Meet William A. "Bill" Peithmann — tax lawyer in Mahomet
William A. "Bill" Peithmann is an attorney based in Mahomet, ILLINOIS. The practice focuses on Tax and Trusts. Currently practicing at The Peithmann Law Office.
The Peithmann Law Office was founded in Farmer City in 1948 by Ortheldo A. Peithmann and his CPA wife, Winona C. Peithmann, as a general practice law firm with a tilt toward municipal law, farm estate planning and tax matters. Bill Peithmann joined the firm in 1985 after a stint as international corporate counsel in California. In May, 2012, the firm re-located 15 miles east to Mahomet, Illinois, where Bill and his wife Lisa have lived since 2006.
Durable, Capable, Reliable:
Over time the firm has narrowed its practice to providing customized tax, estate planning, wealth management and related services to select clients throughout Illinois and Colorado. The Peithmann Law Office is dedicated to providing only the highest quality legal services, equivalent or superior to that provided by larger firms in more urban venues, and proudly stands behind its work. As a result The Peithmann Law Office is regularly cited by its peers as among the very best in Illinois.
Since 2011 the firm has been included in the "U.S. News and World Report America’s Best Law Firms"® with a Tier 1 metropolitan ranking for Trusts and Estates law.
Limited Practice:
The Peithmann Law Office limits its practice to select matters involving wealth management and preservation; asset protection; basic, intermediate and advanced estate planning; trust and estate administration; fiduciary support; charitable organizations; contested estates; elder law; closely-held businesses (especially, family farm operations); business succession planning; commercial and farm real estate; and gift, estate and income taxation of all types. This limited practice may include any one or combination of the following planning, support or legal services:
* Closely and privately held businesses – especially, family farm operations
* Creative ownership methods and organizations
* Customized estate and business succession planning, including appropriate asset protection and tax avoidance techniques, valuation discount strategies, and tailored multi-generation transfer and administrative provisions
* Wills, and trusts of almost every kind
* Powers of appointment
* Special needs, "elder law", guardianships and medicaid planning
* Probate and post-mortem estate planning
* Disclaimers
* Trust and estate administration
* Contested estates
* Fiduciary accounting, tax and administrative support for non-professional family trustees
* Residential, commercial and farm real estate matters of all types
* Gift, estate, generation-skipping and income tax planning, compliance and audits
* Qualified expert case analysis on applicable law, methods and practice
* Retained to assist local counsel in all four Illinois downstate appellate districts
The Peithmann Law Office is very selective in the new clients and referrals it accepts.
Fees:
All Illinois law firms are required to charge "reasonable fees", and The Peithmann Law Office is no exception. While certainly not a low cost provider we believe our fees are very competitive with other firms of similar experience and abilities providing similar legal services, and are substantially less than the fees charged by equivalent firms in Chicago or its collar counties.
All fees are established by prior agreement on terms intended to be commensurate with the value of the work performed and the results attained for the benefit of the client.
Farms and Farming:
Bill Peithmann is a member of the DeWitt County and Piatt County Farm Bureaus and a Commissioner of the Clintonia Union drainage district. He actively manages several small Central Illinois farm operations and also acts as trustee or trustee's agent on behalf of several charitable and non-charitable beneficiaries.
More than half of the firm's clients are engaged, directly or indirectly, in farming.
Speaking and Writing:
Bill Peithmann is also a frequent contributor to legal publications on estate planning matters and lecturer at various tax and estate planning institutes for the American Bar Association, the Illinois Institute for Continuing Legal Education, the Illinois State Bar Association, the Colorado Bar Association, the University of Illinois College of Law, and other professional organizations, on such topics as basic and advanced estate planning and administration, qualified disclaimers, applied valuation discount theory, powers of appointment, advising and protecting fiduciaries, the practical use of revocable and irrevocable trusts, and the various features of the generation skipping transfer tax scheme. He has also provided expert testimony before the civil judiciary panels of the Illinois Senate and the Illinois General Assembly.
Working with William on a tax matter
Firm Background: The Peithmann Law Office was founded in Farmer City in 1948 by Ortheldo A. Peithmann and his CPA wife, Winona C. Peithmann, as a general practice law firm with a tilt toward municipal law, farm estate planning and tax matters. Bill Peithmann joined the firm in 1985 after a stint as international corporate counsel in California. In May, 2012, the firm re-located 15 miles east to…
Clients William works with
William reviews new inquiries case-by-case for tax and trusts matters in Mahomet and the surrounding Illinois area.
Credentials
Education, bar admissions, and languages
University of Denver
J.D. · 1979
Jurisdictions
William's state bar admissions
Colorado, Colorado B
ACTIVE
Illinois, Illinois S
ACTIVE
California, The Stat
ACTIVE
William studied at J.D. in University of Denver.
Law school and academic background
William completed J.D. in University of Denver. Formal legal training is one signal of substantive knowledge — the day-to-day practice William runs in Illinois is where that training gets applied to real client questions.
Recognition
Recognition and thought leadership
William has received 24 formal recognitions from bar associations, industry bodies, and peer-review services.
Lawyer of the Year — Trusts and Estates, Springfield (IL)
2016
Lawyer of the Year — Trusts and Estates, Springfield (IL)
2013
Best Lawyers in America — Tax Law
2026
Best Lawyers in America — Trusts and Estates
2026
Best Lawyers in America — Additional Areas of Practice:
2026
Best Lawyers in America — Agriculture Law
2026
Best Lawyers in America — Litigation - Trusts and Estates
2026
Best Lawyers in America — Real Estate Law
2026
Best Lawyers in America — Special Focus:
2026
Best Lawyers in America — Agribusiness
2026
Best Lawyers in America — Asset Protection
2026
Best Lawyers in America — Business and Succession Planning
2026
Best Lawyers in America — Estate Planning
2026
Best Lawyers in America — Fiduciary Tax
2026
Best Lawyers in America — Finance
2026
Best Lawyers in America — Nonprofit Organizations and Charitable Giving
2026
Best Lawyers in America — Tax
2026
Best Lawyers in America — Wealth Management
2026
Best Lawyers in America — Awards:
2026
Best Lawyers in America — AVVO Rating 10 of 10; "Superb" since 2015
2026
Best Lawyers in America — Past Chair, Illinois State Bar Association's Trusts & Estates Section
2026
Best Lawyers in America — Who's Who in American Law
2026
Best Lawyers in America — Illinois State Bar Association Board of Governors Award 1998
2026
Best Lawyers in America — Martindale-Hubbell “AV” rating in 1994
2026
Legal awards and honors
Lawyer of the Year — Trusts and Estates, Springfield (IL) (2016). Lawyer of the Year — Trusts and Estates, Springfield (IL) (2013). Best Lawyers in America — Tax Law (2026). Best Lawyers in America — Trusts and Estates (2026). Best Lawyers in America — Additional Areas of Practice: (2026). Best Lawyers in America — Agriculture Law (2026).
Locations
William A. "Bill" Peithmann's office in Mahomet
William's primary office is at 409 East Main Street, Mahomet, Illinois, 61853. In-person meetings are by appointment; a phone intake usually comes first.
Client feedback
Client reviews of William A. "Bill" Peithmann
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Schedule your consultationHiring guide
How to hire William A. "Bill" Peithmann — what to expect in your first consultation
Working with a new tax attorney should feel structured. Here's how the first two conversations with William usually go, from the moment you request a consult to the day representation begins.
Consultation formats and pricing
William charges for the initial consult. That fee is credited toward representation if you retain William's office.
What to bring to your first meeting
Bring any documents you already have — police reports, medical records, filed pleadings, correspondence from an insurer, a copy of the contract at issue. If you're not sure, err on the side of bringing everything; William will tell you what matters and what doesn't.
Questions to ask a tax attorney in Mahomet, Illinois
A short list to run through before you commit: How many tax matters have you handled in the last year? What's your fee structure? Who else in the office will work on this? What's your realistic estimate of timeline and range of outcomes? How do I reach you between meetings?
Fees & payment
Fees, payment methods, and consultation options for William
William discusses fees during intake so the arrangement fits the matter. Contingency, hourly, and flat-fee options are all common in tax practice — ask which fits.
Hourly rates, contingency fees, and flat-fee options
Every tax matter is priced differently. Simple document review might be a flat fee. Injury litigation is often contingency. Complex commercial disputes usually run hourly with a retainer. William confirms the model in the engagement letter before any work starts.
Payment methods and payment plans
William's office accepts standard payment methods. Ask about payment plans if the retainer is a stretch — many tax practices work with clients on structured schedules.
Frequently asked
Frequently asked questions about William A. "Bill" Peithmann
How much does it cost to hire William for a tax case?
Cost depends on the type of matter, the fee model (contingency, flat, hourly), and how contested the case becomes. William walks through the likely range during the consult so there are no surprises.
Does William offer a free consultation?
William charges for the initial consult; that fee is credited toward representation if you retain William's office. Some tax attorneys offer free consults — check William's current terms during booking.
How long do tax cases in Illinois typically take?
Simple tax matters can wrap in a few weeks; disputed cases can run 6–18 months from intake to resolution, longer if the matter goes to trial. William gives a realistic estimate for your facts at the consult — vague answers here are a red flag.
Can William take my case if I'm outside Mahomet?
William is licensed in Illinois. Matters governed by Illinois law are the natural fit. Out-of-state matters are handled case-by-case, sometimes with local co-counsel. Ask during intake — William will tell you if the case is a fit or refer you to someone closer to your court.
What should I bring to my first meeting with William?
Bring every document that touches the dispute: contracts, correspondence, police or medical reports, filed pleadings, invoices, photographs, insurance letters. Also bring a written timeline of what happened, in your own words. William will filter what matters — over-preparing at intake is always cheaper than needing a second meeting.
Is William accepting new tax clients right now?
William's intake status shifts week to week. Submit the form; the office will confirm availability or refer the matter out.
Areas served
Tax attorneys serving Mahomet, Chicago and Springfield in Illinois
William handles tax matters throughout Illinois. Each city below is a direct link into the search page for verified tax attorneys in that community.
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